SpringBoot服务端表单数据校验
Posted Biexiansheng
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1、首先说明一下，这里使用的是Springboot2.2.6.RELEASE版本，由于Springboot迭代很快，所以要注意版本问题。
SpringBoot对表单做数据校验，SpringBoot对表单数据校验的技术特点，SpringBoot中使用了Hibernate-validate校验框架（SpringBoot的Web启动器中已经包含了Hibernate-validate校验框架的依赖jar包）。
2、SpringBoot表单数据校验步骤。
2.1、第一步，在实体类中添加校验规则，在被校验的实体类中要被校验的属性，使用注解进行校验。
1 package com.bie.springboothello.po; 2 3 import javax.validation.constraints.NotBlank; 4 5 public class Users 6 7 private Integer id;//用户编号 8 @NotBlank // 非空检验，表示当前属性不能为空。 9 private String name;//用户账号 10 @NotBlank //密码非空校验 11 private Integer age;//用户密码 12 13 public Integer getId() 14 return id; 15 16 17 public void setId(Integer id) 18 this.id = id; 19 20 21 public String getName() 22 return name; 23 24 25 public void setName(String name) 26 this.name = name; 27 28 29 public Integer getAge() 30 return age; 31 32 33 public void setAge(Integer age) 34 this.age = age; 35 36 37 @Override 38 public String toString() 39 return "Users" + 40 "id=" + id + 41 ", name='" + name + '\\'' + 42 ", age=" + age + 43 ''; 44 45 46 public Users(Integer id, String name, Integer age) 47 this.id = id; 48 this.name = name; 49 this.age = age; 50 51
2.2、第二步，在Controller中开启校验。
1 package com.bie.springboothello.controller;
2
3 import com.bie.springboothello.po.Users;
4 import com.bie.springboothello.service.UsersService;
5 import org.springframework.beans.factory.annotation.Autowired;
6 import org.springframework.stereotype.Controller;
7 import org.springframework.ui.Model;
8 import org.springframework.validation.BindingResult;
9 import org.springframework.web.bind.annotation.PathVariable;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.bind.annotation.ResponseBody;
12
13 import javax.validation.Valid;
14 import java.util.List;
15
16 /**
17 * SpringBoot表单数据校验
18 */
19
20 @Controller
21 @RequestMapping(value = "/users")
22 public class UsersController
23
24 @Autowired
25 private UsersService usersService;
26
27
28 /**
29 * 页面跳转
30 * <p>
31 * <p>
32 * thymeleaf框架，模板级的视图层技术，需要放到classpath的根目录下，也就是src/main/resources下面的一个包叫做templates的目录下面
33 *
34 * <p>
35 * <p>
36 * 由于templates目录是安全的，不允许直接被外界访问的，所以将视图放到这里面之后，必须有Controller里面的方法
37 * 帮助做页面的跳转，此方法的作用就是做页面的跳转。
38 *
39 * @param page
40 * @return
41 */
42 @RequestMapping(value = "/page")
43 public String showPage(@PathVariable String page)
44 System.out.println("============================================" + page);
45 return page;
46
47
48
49 /**
50 * 添加用户信息
51 *
52 * @param users @Valid注解表示开启对Users对象的数据校验。
53 * @param bindingResult 校验过程中产生的校验结果，校验结果存放到BindingResult中。封装了校验的结果。
54 * 对校验结果的成功或者错误的提示信息进行回显进行提示。
55 * @return
56 */
57 @RequestMapping(value = "addUser")
58 public String addUser(@Valid Users users, BindingResult bindingResult)
59 // 如果校验失败了，从那个页面来返回到那个界面即可，并进行提示。
60 if (bindingResult.hasErrors())
61 return "input";
62
63 this.usersService.addUser(users);
64 return "redirect:/users/findUserAll";
65
66
67
68
2.3、第三步，在页面中获取提示信息。
1 <!DOCTYPE html> 2 <html xmlns:th="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>添加用户</title> 6 </head> 7 <body> 8 <h1 style="text-align: center">用户管理~新增用户</h1> 9 <hr/> 10 11 <div style="text-align: center"> 12 <form th:action="@/users/addUser" method="post"> 13 14 用户姓名：<input type="text" name="name"/> 15 <!-- 根据users.name去BindingResult对象里面查找的key，然后找到错误信息进行提示，按照参数对象的驼峰方式进行命名，这个驼峰命名的就是前端要使用的对象 --> 16 <span color="red" th:errors="$users.name"></span><br/> 17 用户年龄：<input type="text" name="age"/> 18 <span color="red" th:errors="$users.age"></span><br/><br/> 19 <input type="submit" value="确定"/> 20 <input type="reset" value="重置"/><br/> 21 </form> 22 </div> 23 24 </body> 25 </html>
嗯，报错了，说找不到users属性了。因为这里面的跳转是，如果验证出现了问题，那么跳转到输入界面，而这个跳转到输入界面是由Controller的一个方法跳转的，此时这个方法没有users属性，导致的报错。
1 2020-05-11 22:55:18.726 ERROR 5052 --- [0.1-8080-exec-2] org.thymeleaf.TemplateEngine : [THYMELEAF][http-nio-127.0.0.1-8080-exec-2] Exception processing template "input": Error during execution of processor 'org.thymeleaf.spring5.processor.SpringErrorsTagProcessor' (template: "input" - line 16, col 27) 2 3 org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringErrorsTagProcessor' (template: "input" - line 16, col 27) 4 at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:117) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 5 at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 6 at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 7 at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 8 at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 9 at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 10 at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:592) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 11 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) [thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 12 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) [thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 13 at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362) [thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 14 at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189) [thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 15 at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 16 at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 17 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 18 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 19 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 20 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 21 at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) [tomcat-embed-core-9.0.33.jar:9.0.33] 22 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 23 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.33.jar:9.0.33] 24 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.33.jar:9.0.33] 25 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 26 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.33.jar:9.0.33] 27 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 28 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 29 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 30 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 31 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 32 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 33 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 34 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 35 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 36 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 37 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 38 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 39 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 40 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 41 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.33.jar:9.0.33] 42 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33] 43 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33] 44 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33] 45 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33] 46 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33] 47 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33] 48 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33] 49 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33] 50 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33] 51 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33] 52 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33] 53 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191] 54 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191] 55 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33] 56 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191] 57 Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'users' available as request attribute 58 at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:153) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 59 at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:903) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 60 at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus(SpringWebMvcThymeleafRequestContext.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 61 at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:306) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 62 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:258) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 63 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 64 at org.thymeleaf.spring5.processor.SpringErrorsTagProcessor.doProcess(SpringErrorsTagProcessor.java:65) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 65 at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 66 ... 52 common frames omitted 67 68 2020-05-11 22:55:18.729 ERROR 5052 --- [0.1-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringErrorsTagProcessor' (template: "input" - line 16, col 27)] with root cause 69 70 java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'users' available as request attribute 71 at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:153) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 72 at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:903) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 73 at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus(SpringWebMvcThymeleafRequestContext.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 74 at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:306) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 75 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:258) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 76 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 77 at org.thymeleaf.spring5.processor.SpringErrorsTagProcessor.doProcess(SpringErrorsTagProcessor.java:65) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 78 at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 79 at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 80 at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 81 at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 82 at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 83 at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 84 at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:592) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 85 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 86 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 87 at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 88 at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 89 at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 90 at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 91 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 92 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 93 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 94 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 95 at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 96 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 97 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 98 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 99 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 100 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33] 101 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 102 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 103 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 104 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 105 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 106 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 107 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 108 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 109 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 110 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 111 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 112 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 113 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 114 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 115 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 116 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33] 117 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33] 118 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33] 119 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33] 120 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33] 121 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33] 122 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33] 123 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33] 124 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33] 125 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33] 126 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33] 127 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191] 128 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191] 129 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33] 130 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]
解决数据校验时的异常问题，解决异常的方法，在跳转页面的方法中注入一个对象，来解决问题。要求参数对象的，变量名必须是对象的类名的全称首字母小写。
1 package com.bie.springboothello.controller;
2
3 import com.bie.springboothello.po.Users;
4 import com.bie.springboothello.service.UsersService;
5 import org.springframework.beans.factory.annotation.Autowired;
6 import org.springframework.stereotype.Controller;
7 import org.springframework.ui.Model;
8 import org.springframework.validation.BindingResult;
9 import org.springframework.web.bind.annotation.PathVariable;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.bind.annotation.ResponseBody;
12
13 import javax.validation.Valid;
14 import java.util.List;
15
16 /**
17 * SpringBoot表单数据校验
18 */
19
20 @Controller
21 @RequestMapping(value = "/users")
22 public class UsersController
23
24 @Autowired
25 private UsersService usersService;
26
27 /**
28 * 页面跳转
29 * <p>
30 * <p>
31 * thymeleaf框架，模板级的视图层技术，需要放到classpath的根目录下，也就是src/main/resources下面的一个包叫做templates的目录下面
32 *
33 * <p>
34 * <p>
35 * 由于templates目录是安全的，不允许直接被外界访问的，所以将视图放到这里面之后，必须有Controller里面的方法
36 * 帮助做页面的跳转，此方法的作用就是做页面的跳转。
37 * <p>
38 * <p>
39 * 解决异常的方式。可以在跳转页面的方法中注入一个 Uesrs 对象。
40 * 注意：由于springmvc会将该对象放入到Model中传递。key的名称会使用该对象的驼峰式的命名规则来作为key。
41 * 参数的变量名需要与对象的名称相同。将首字母小写。
42 *
43 * @param page
44 * @return
45 */
46 @RequestMapping(value = "/page")
47 public String showPage(@PathVariable String page, Users users)
48 System.out.println("============================================" + page);
49 return page;
50
51
52
53 /**
54 * 添加用户信息
55 *
56 * @param users @Valid注解表示开启对Users对象的数据校验。
57 * @param bindingResult 校验过程中产生的校验结果，校验结果存放到BindingResult中。封装了校验的结果。
58 * 对校验结果的成功或者错误的提示信息进行回显进行提示。
59 * @return
60 */
61 @RequestMapping(value = "addUser")
62 public String addUser(@Valid Users users, BindingResult bindingResult)
63 // 如果校验失败了，从那个页面来返回到那个界面即可，并进行提示。
64 if (bindingResult.hasErrors())
65 return "input";
66
67 this.usersService.addUser(users);
68 return "redirect:/users/findUserAll";
69
70
71
嗯，又报错了。这里需要注意的是，我的年龄age写成的是Integer类型的。Java实体类中属性是Integer类型，用了NotBlank判断不能为空，而这个注解是判断字符串String是否为空。此时可以使用使用@NotNull， 去掉@NotBlank注解。
备注：使用hibernate validator需要注意@NotNull和@NotEmpty和@NotBlank区别。
a、@NotEmpty用在集合类上面。
b、@NotBlank用在String上面。
c、@NotNull用在基本类型上。
如果在基本类型上面用NotEmpty或者NotBlank 会出现上面的错。
1 2020-05-14 10:20:19.944 ERROR 1924 --- [0.1-8080-exec-6] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.NotBlank' validating type 'java.lang.Integer'. Check configuration for 'age'] with root cause 2 3 javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.NotBlank' validating type 'java.lang.Integer'. Check configuration for 'age' 4 at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getExceptionForNullValidator(ConstraintTree.java:108) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 5 at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:140) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 6 at org.hibernate.validator.internal.engine.constraintvalidation.SimpleConstraintTree.validateConstraints(SimpleConstraintTree.java:55) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 7 at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:73) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 8 at org.hibernate.validator.internal.metadata.core.MetaConstraint.doValidateConstraint(MetaConstraint.java:127) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 9 at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:120) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 10 at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:552) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 11 at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:515) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 12 at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:485) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 13 at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:447) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 14 at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:397) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 15 at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:173) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 16 at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:109) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE] 17 at org.springframework.boot.autoconfigure.validation.ValidatorAdapter.validate(ValidatorAdapter.java:65) ~[spring-boot-autoconfigure-2.2.6.RELEASE.jar:2.2.6.RELEASE] 18 at org.springframework.validation.DataBinder.validate(DataBinder.java:892) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE] 19 at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.validateIfApplicable(ModelAttributeMethodProcessor.java:360) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 20 at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:162) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 21 at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 22 at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 23 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 24 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 25 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 26 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 27 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 28 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 29 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 30 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 31 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 32 at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 33 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 34 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 35 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 36 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 37 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33] 38 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 39 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 40 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 41 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 42 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 43 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 44 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 45 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 46 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 47 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 48 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 49 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 50 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 51 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 52 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 53 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33] 54 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33] 55 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33] 56 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33] 57 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33] 58 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33] 59 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33] 60 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33] 61 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33] 62 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33] 63 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33] 64 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191] 65 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191] 66 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33] 67 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]
如果参数的名称需要做改变。如果想为传递的对象更改名称，可以使用@ModelAttribute("user")这表示当 前传递的对象的 key 为 user。那么我们在页面中获取该对象的 key 也需要修改为 user。
1 package com.bie.springboothello.controller;
2
3 import com.bie.springboothello.po.Users;
4 import com.bie.springboothello.service.UsersService;
5 import org.springframework.beans.factory.annotation.Autowired;
6 import org.springframework.stereotype.Controller;
7 import org.springframework.ui.Model;
8 import org.springframework.validation.BindingResult;
9 import org.springframework.web.bind.annotation.ModelAttribute;
10 import org.springframework.web.bind.annotation.PathVariable;
11 import org.springframework.web.bind.annotation.RequestMapping;
12 import org.springframework.web.bind.annotation.ResponseBody;
13
14 import javax.validation.Valid;
15 import java.util.List;
16
17 /**
18 * SpringBoot表单数据校验
19 */
20
21 @Controller
22 @RequestMapping(value = "/users")
23 public class UsersController
24
25 @Autowired
26 private UsersService usersService;
27
28 /**
29 * 页面跳转
30 * <p>
31 * <p>
32 * thymeleaf框架，模板级的视图层技术，需要放到classpath的根目录下，也就是src/main/resources下面的一个包叫做templates的目录下面
33 *
34 * <p>
35 * <p>
36 * 由于templates目录是安全的，不允许直接被外界访问的，所以将视图放到这里面之后，必须有Controller里面的方法
37 * 帮助做页面的跳转，此方法的作用就是做页面的跳转。
38 * <p>
39 * <p>
40 * 解决异常的方式。可以在跳转页面的方法中注入一个 Uesrs 对象。
41 * 注意：由于springmvc会将该对象放入到Model中传递。key的名称会使用该对象的驼峰式的命名规则来作为key。
42 * 参数的变量名需要与对象的名称相同。将首字母小写。
43 * <p>
44 * <p>
45 * 如果想为传递的对象更改名称，可以使用@ModelAttribute("user")这表示当 前传递的对象的 key 为 user。
46 * 那么我们在页面中获取该对象的 key 也需要修改为 user
47 *
48 * @param page
49 * @return
50 */
51 @RequestMapping(value = "/page")
52 public String showPage(@PathVariable String page, @ModelAttribute(value = "user") Users users)
53 System.out.println("============================================" + page);
54 return page;
55
56
57
58 /**
59 * 添加用户信息
60 *
61 * @param users @Valid注解表示开启对Users对象的数据校验。
62 * @param bindingResult 校验过程中产生的校验结果，校验结果存放到BindingResult中。封装了校验的结果。
63 * 对校验结果的成功或者错误的提示信息进行回显进行提示。
64 * @return
65 */
66 @RequestMapping(value = "addUser")
67 public String addUser(@ModelAttribute(value = "user") @Valid Users users, BindingResult bindingResult)
68 // 如果校验失败了，从那个页面来返回到那个界面即可，并进行提示。
69 if (bindingResult.hasErrors())
70 return "input";
71
72 this.usersService.addUser(users);
73 return "redirect:/users/findUserAll";
74
75
76
1 <!DOCTYPE html> 2 <html xmlns:th="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>添加用户</title> 6 </head> 7 <body> 8 <h1 style="text-align: center">用户管理~新增用户</h1> 9 <hr/> 10 11 <div style="text-align: center"> 12 <form th:action="@/users/addUser" method="post"> 13 14 用户姓名：<input type="text" name="name"/> 15 <!-- 根据users.name去BindingResult对象里面查找的key，然后找到错误信息进行提示 --> 16 <span style="color:red" th:errors="$user.name"></span><br/> 17 用户年龄：<input type="text" name="age"/> 18 <span style="color:red" th:errors="$user.age"></span><br/><br/> 19 <input type="submit" value="确定"/> 20 <input type="reset" value="重置"/><br/> 21 </form> 22 </div> 23 24 </body> 25 </html>
演示效果，如下所示：
如何指定验证提示信息呢。
1 package com.bie.springboothello.po; 2 3 import javax.validation.constraints.NotBlank; 4 import javax.validation.constraints.NotNull; 5 6 public class Users 7 8 private Integer id;//用户编号 9 @NotBlank(message = "用户账号不能为空.") // 用户账号，非空检验 10 private String name;//用户账号 11 @NotNull(message = "用户密码不能为空") //用户密码，非空校验 12 private Integer age;//用户密码 13 14 public Integer getId() 15 return id; 16 17 18 public void setId(Integer id) 19 this.id = id; 20 21 22 public String getName() 23 return name; 24 25 26 public void setName(String name) 27 this.name = name; 28 29 30 public Integer getAge() 31 return age; 32 33 34 public void setAge(Integer age) 35 this.age = age; 36 37 38 @Override 39 public String toString() 40 return "Users" + 41 "id=" + id + 42 ", name='" + name + '\\'' + 43 ", age=" + age + 44 ''; 45 46 47 public Users(Integer id, String name, Integer age) 48 this.id = id; 49 this.name = name; 50 this.age = age; 51 52
演示效果，如下所示：
使用hibernate validator其他校验规则。
1）、@NotBlank: 判断字符串是否为null或者是空串(去掉首尾空格)。
2）、@NotEmpty: 判断字符串是否null或者是空串。
3）、@Length: 判断字符的长度(最大或者最小)。
4）、@Min: 判断数值最小值。
5）、@Max: 判断数值最大值。
6）、@Email: 判断邮箱是否合法。
7）、@NotNull用在基本类型上。
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