springboot之jpa支持
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相关pom依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
application.yml配置
spring:
jpa:
hibernate:
ddl-auto: update
show-sql: true
自动建表相关代码
package com.lingerqi.springboot03.entity;
import lombok.Data;
import javax.persistence.*;
/**
* @author xyls
* @blog name & blog address 027@0030
* @create 2019-11-30 16:42
*/
@Data
@Entity
@Table(name = "t_springboot_book_1")
public class Book {
@Id
@GeneratedValue
private Integer bid;
@Column(length = 100)
private String bname;
@Column
private float price;
}
jpa值增删改查
* 只要继承JpaRepository，通常所用的增删查改方法都有
* 第一个参数：操作的实体类
* 第二个参数：实体类对应数据表的主键
*/
public interface JpaDao extends JpaRepository<Book, Integer> {
}
controller层
@Autowired
private JpaDao jpaDao;
@RequestMapping("/add")
public String add(Book book){
jpaDao.save(book);
return "success";
}
@RequestMapping("/edit")
public String edit(Book book){
jpaDao.save(book);
return "success";
}
@RequestMapping("/del")
public String del(Book book){
jpaDao.delete(book);
return "success";
}
@RequestMapping("/getOne")
public Book getOne(Integer bid){
// 会出现懒加载问题：org.hibernate.LazyInitializationException: could not initialize proxy - no Session
// return jpaDao.getOne(bid);
return jpaDao.findById(bid).get();
}
@RequestMapping("/getAll")
public List<Book> getAll(){
return jpaDao.findAll();
}
新增：
jpa值复杂查询
* 要使用高级查询必须继承
* org.springframework.data.jpa.repository.JpaSpecificationExecutor<T>接口
*/
public interface JpaDao extends JpaRepository<Book, Integer>, JpaSpecificationExecutor<Book> {
}
controller层
@RequestMapping("/getCondition")
public List<Book> getCondition(Book book){
return jpaDao.findAll(new Specification<Book>() {
@Override
public Predicate toPredicate(Root<Book> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Predicate predicate = criteriaBuilder.conjunction();
if(book != null){
if(null != book.getBname() && !"".equals(book.getBname())){
predicate.getExpressions().add(criteriaBuilder.like(root.get("bname"),"%"+book.getBname()+"%"));
}
}
return predicate;
}
});
}
SpringBoot+bootstarp界面版增删改查及图片上传
pom：
<mysql.version>5.1.44</mysql.version> <version>${mysql.version}</version> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> </dependency>
application.yml文件配置
server:
port: 80
servlet:
context-path: /
spring:
jpa:
hibernate:
ddl-auto: update
show-sql: true
datasource:
#1.JDBC
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
username: root
password: 123
druid:
initial-size: 5
min-idle: 5
max-active: 20
max-wait: 60000
time-between-eviction-runs-millis: 60000
min-evictable-idle-time-millis: 30000
validation-query: SELECT 1 FROM DUAL
test-while-idle: true
test-on-borrow: true
test-on-return: false
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
filter:
stat:
merge-sql: true
slow-sql-millis: 5000
web-stat-filter:
enabled: true
url-pattern: /*
exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
session-stat-enable: true
session-stat-max-count: 100
stat-view-servlet:
enabled: true
url-pattern: /druid/*
reset-enable: true
login-username: root
login-password: 123
allow: 127.0.0.1
#deny: 192.168.1.100
thymeleaf:
cache: false
# 解决图片上传大小限制问题，也可采取配置类
servlet:
multipart:
max-file-size: 20MB
max-request-size: 60MB
Springbootapplication.java:
@EnableTransactionManagement @SpringBootApplication
上传文件映射配置类MyWebAppConfigurer.java
package com.lingerqi.springboot03.config;
/**
* @author xyls
* @blog name & blog address 027@0030
* @create 2019-12-01 11:10
*/
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
/**
* 资源映射路径
*/
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurationSupport {
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
registry.addResourceHandler("/uploadImages/**").addResourceLocations("file:E:/temp/");
super.addResourceHandlers(registry);
}
}
后台代码
StringUtils
package com.lingerqi.springboot03.utils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
public class StringUtils {
// 私有的构造方法，保护此类不能在外部实例化
private StringUtils() {
}
/**
* 如果字符串等于null或去空格后等于""，则返回true，否则返回false
*
* @param s
* @return
*/
public static boolean isBlank(String s) {
boolean b = false;
if (null == s || s.trim().equals("")) {
b = true;
}
return b;
}
/**
* 如果字符串不等于null或去空格后不等于""，则返回true，否则返回false
*
* @param s
* @return
*/
public static boolean isNotBlank(String s) {
return !isBlank(s);
}
/**
* set集合转string
* @param hasPerms
* @return
*/
public static String SetToString(Set hasPerms){
return Arrays.toString(hasPerms.toArray()).replaceAll(" ", "").replace("[", "").replace("]", "");
}
/**
* 转换成模糊查询所需参数
* @param before
* @return
*/
public static String toLikeStr(String before){
return isBlank(before) ? null : "%"+before+"%";
}
/**
* 将图片的服务器访问地址转换为真实存放地址
* @param imgpath 图片访问地址（http://localhost:8080/uploadImage/2019/01/26/20190126000000.jpg）
* @param serverDir uploadImage
* @param realDir E:/temp/
* @return
*/
public static String serverPath2realPath(String imgpath, String serverDir, String realDir) {
imgpath = imgpath.substring(imgpath.indexOf(serverDir));
return imgpath.replace(serverDir,realDir);
}
/**
* 过滤掉集合里的空格
* @param list
* @return
*/
public static List<String> filterWhite(List<String> list){
List<String> resultList=new ArrayList<String>();
for(String l:list){
if(isNotBlank(l)){
resultList.add(l);
}
}
return resultList;
}
/**
* 从html中提取纯文本
* @param strHtml
* @return
*/
public static String html2Text(String strHtml) {
String txtcontent = strHtml.replaceAll("</?[^>]+>", ""); //剔出<html>的标签
txtcontent = txtcontent.replaceAll("<a>\\\\s*|\\t|\\r|\\n</a>", "");//去除字符串中的空格,回车,换行符,制表符
return txtcontent;
}
public static void main(String[] args) {
}
}
PageUtil
package com.lingerqi.springboot03.utils;
import java.util.Map;
import java.util.Set;
/**
* @author xyls
* @blog name & blog address 027@0030
* @create 2019-12-01 11:10
*
* 基于bootstrap3生成分页代码
*/
public class PageUtil {
public static String createPageCode(PageBean pageBean) {
StringBuffer sb = new StringBuffer();
/*
* 拼接向后台提交数据的form表单
* 注意：拼接的form表单中的page参数是变化的，所以不需要保留上一次请求的值
*/
sb.append("<form id=\'pageBeanForm\' action=\'"+pageBean.getUrl()+"\' method=\'post\'>");
sb.append("<input type=\'hidden\' name=\'page\'>");
Map<String, String[]> parameterMap = pageBean.getParamMap();
if(parameterMap != null && parameterMap.size() > 0) {
Set<Map.Entry<String, String[]>> entrySet = parameterMap.entrySet();
for (Map.Entry<String, String[]> entry : entrySet) {
if(!"page".equals(entry.getKey())) {
String[] values = entry.getValue();
for (String val : values) {
sb.append("<input type=\'hidden\' name=\'"+entry.getKey()+"\' value=\'"+val+"\'>");
}
}
}
}
sb.append("</form>");
if(pageBean.getTotal()==0){
return "未查询到数据";
}else{
sb.append("<li><a href=\'javascript:gotoPage(1)\'>首页</a></li>");
if(pageBean.getPage()>1){
sb.append("<li><a href=\'javascript:gotoPage("+pageBean.getPreviousPage()+")\'>上一页</a></li>");
}else{
sb.append("<li class=\'disabled\'><a href=\'javascript:gotoPage(1)\'>上一页</a></li>");
}
for(int i=pageBean.getPage()-1;i<=pageBean.getPage()+1;i++){
if(i<1||i>pageBean.getMaxPage()){
continue;
}
if(i==pageBean.getPage()){
sb.append("<li class=\'active\'><a href=\'#\'>"+i+"</a></li>");
}else{
sb.append("<li><a href=\'javascript:gotoPage("+i+")\'>"+i+"</a></li>");
}
}
if(pageBean.getPage()<pageBean.getMaxPage()){
sb.append("<li><a href=\'javascript:gotoPage("+pageBean.getNextPage()+")\'>下一页</a></li>");
}else{
sb.append("<li class=\'disabled\'><a href=\'javascript:gotoPage("+pageBean.getMaxPage()+")\'>下一页</a></li>");
}
sb.append("<li><a href=\'javascript:gotoPage("+pageBean.getMaxPage()+")\'>尾页</a></li>");
}
/*
* 给分页条添加与后台交互的js代码
*/
sb.append("<script type=\'text/javascript\'>");
sb.append(" function gotoPage(page) {");
sb.append(" document.getElementById(\'pageBeanForm\').page.value = page;");
sb.append(" document.getElementById(\'pageBeanForm\').submit();");
sb.append(" }");
sb.append(" function skipPage() {");
sb.append(" var page = document.getElementById(\'skipPage\').value;");
sb.append(" if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
sb.append(" alert(\'请输入1~N的数字\');");
sb.append(" return;");
sb.append(" }");
sb.append(" gotoPage(page);");
sb.append(" }");
sb.append("</script>");
return sb.toString();
}
}
dao层
package com.lingerqi.springboot03.repository;
import com.lingerqi.springboot03.entity.Teacher;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
/**
* @author xyls
* @blog name & blog address 027@0030
* @create 2019-11-30 16:42
*
* 只要继承JpaRepository，通常所用的增删查改方法都有
* 第一个参数：操作的实体类
* 第二个参数：实体类对应数据表的主键
*
* 要使用高级查询必须继承
* org.springframework.data.jpa.repository.JpaSpecificationExecutor<T>接口
*/
public interface TeacherDao extends JpaRepository<Teacher, Integer>, JpaSpecificationExecutor<Teacher> {
}
controler层
package com.lingerqi.springboot03.controller;
import com.lingerqi.springboot03.entity.Teacher;
import com.lingerqi.springboot03.service.TeacherService;
import com.lingerqi.springboot03.utils.PageBean;
import com.lingerqi.springboot03.utils.PageUtil;
import com.lingerqi.springboot03.utils.StringUtils;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
/**
* @author xyls
* @blog name & blog address 027@0030
* @create 2019-12-01 11:57
*/
@Controller
@RequestMapping("/teacher")
public class TeacherController {
@Autowired
private TeacherService teacherService;
@RequestMapping("/listPager")
public ModelAndView list(Teacher teacher, HttpServletRequest request) {
PageBean pageBean = new PageBean();
pageBean.setRequest(request);
ModelAndView modelAndView = new ModelAndView();
Page<Teacher> teachers = teacherService.listPager(teacher, pageBean);
modelAndView.addObject("teachers", teachers.getContent());
pageBean.setTotal(teachers.getTotalElements() + "");
modelAndView.addObject("pageCode", PageUtil.createPageCode(pageBean)/*.replaceAll("<","<").replaceAll(">:",">")*/);
modelAndView.setViewName("list");
return modelAndView;
}
@RequestMapping("/toEdit")
public ModelAndView toEdit(Teacher teacher) {
ModelAndView modelAndView = new ModelAndView();
modelAndView.setViewName("edit");
modelAndView.addObject("sexArr", new String[]{"男", "女"});
if (!(teacher.getTid() == null || "".equals(teacher.getTid()))) {
Teacher t = teacherService.findById(teacher.getTid());
modelAndView.addObject("teacher", t);
}
return modelAndView;
}
@RequestMapping("/add")
public String add(Teacher teacher, MultipartFile image) {
try {
String diskPath = "E://temp/" + image.getOriginalFilename();
String serverPath = "/uploadImages/" + image.getOriginalFilename();
if (StringUtils.isNotBlank(image.getOriginalFilename())) {
FileUtils.copyInputStreamToFile(image.getInputStream(), new File(diskPath));
teacher.setImagePath(serverPath);
}
teacherService.save(teacher);
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:/teacher/listPager";
}
@RequestMapping("/edit")
public String edit(Teacher teacher, MultipartFile image) {
String diskPath = "E://temp/" + image.getOriginalFilename();
String serverPath = "/uploadImages/" + image.getOriginalFilename();
if (StringUtils.isNotBlank(image.getOriginalFilename())) {
try {
FileUtils.copyInputStreamToFile(image.getInputStream(), new File(diskPath));
teacher.setImagePath(serverPath);
} catch (IOException e) {
e.printStackTrace();
}
}
teacherService.save(teacher);
return "redirect:/teacher/listPager";
}
@RequestMapping("/del/{bid}")
public String del(@PathVariable(value = "bid") Integer bid) {
teacherService.deleteById(bid);
return "redirect:/teacher/listPager";
}
}
页面层
list.html
<!DOCTYPE html>
<html lang="en">
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>书籍列表</title>
<script type="text/javascript" th:src="@{/static/js/xxx.js}"></script>
<link rel="stylesheet" th:href="@{/static/js/bootstrap3/css/bootstrap.min.css}">
<link rel="stylesheet" th:href="@{/static/js/bootstrap3/css/bootstrap-theme.min.css}">
<script type="text/javascript" th:src="@{/static/js/bootstrap3/js/jquery-1.11.2.min.js}"></script>
<script type="text/javascript" th:src="@{/static/js/bootstrap3/js/bootstrap.min.js}"></script>
</head>
<body>
<form th:action="@{/teacher/listPager}" method="post">
书籍名称： <input type="text" name="tname" />
<input type="submit" value="提交"/>
</form>
<a th:href="@{/teacher/toEdit}">新增</a>
<table border="1px" width="600px">
<thead>
<tr>
<td>ID</td>
<td>头像</td>
<td>姓名</td>
<td>性别</td>
<td>简介</td>
<td>操作</td>
</tr>
</thead>
<tbody>
<tr th:each="teacher : ${teachers}">
<td th:text="${teacher.tid}"></td>
<td><img style="width: 60px;height: 60px;" id="imgshow" th:src="${teacher.imagePath}" th:alt="${teacher.tname}"/></td>
<!--<td th:text="${teacher.imagePath}"></td>-->
<td th:text="${teacher.tname}"></td>
<td th:text="${teacher.sex}"></td>
<td th:text="${teacher.description}"></td>
<td>
<a th:href="@{\'/teacher/del/\'+${teacher.tid}}">删除</a>
<a th:href="@{\'/teacher/toEdit?tid=\'+${teacher.tid}}">修改</a>
</td>
</tr>
</tbody>
</table>
<nav>
<ul class="pagination pagination-sm" th:utext="${pageCode}">
</ul>
<!--<ul class="pagination pagination-sm">-->
<!--<form id=\'pageBeanForm\' action=\'http://localhost:8080/springboot/teacher/listPager\' method=\'post\'><input type=\'hidden\' name=\'page\'></form>-->
<!--<li><a href=\'javascript:gotoPage(1)\'>首页</a></li>-->
<!--<li class=\'disabled\'><a href=\'javascript:gotoPage(1)\'>上一页</a></li>-->
<!--<li class=\'active\'><a href=\'#\'>1</a></li>-->
<!--<li><a href=\'javascript:gotoPage(2)\'>2</a></li>-->
<!--<li><a href=\'javascript:gotoPage(2)\'>下一页</a></li>-->
<!--<li><a href=\'javascript:gotoPage(4)\'>尾页</a></li>-->
<!--<script type=\'text/javascript\'> function gotoPage(page) { document.getElementById(\'pageBeanForm\').page.value = page; document.getElementById(\'pageBeanForm\').submit(); } function skipPage() { var page = document.getElementById(\'skipPage\').value; if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>4){ alert(\'请输入1~N的数字\'); return; } gotoPage(page); }</script>-->
<!--</ul>-->
</nav>
</body>
</html>
edit.html:
<!DOCTYPE html>
<html lang="en">
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>用户编辑界面</title>
<script type="text/javascript">
function preShow() {
}
</script>
</head>
<body>
<form th:action="@{${teacher.tid} ? \'/teacher/edit\' : \'/teacher/add\'}" method="post" enctype="multipart/form-data">
<input type="hidden" name="tid" th:value="${teacher.tid}" />
<input type="hidden" name="imagePath" th:value="${teacher.imagePath}" />
<img id="imgshow" src="" alt=""/>
<input type="file" name="image" onchange="preShow();"></br>
教员名称： <input type="text" name="tname" th:value="${teacher.tname}" /></br>
教员描述： <input type="text" name="description" th:value="${teacher.description}" /></br>
单选回显
<input type="radio" name="sex"
th:each ="s:${sexArr}"
th:value="${s}"
th:text ="${s}"
th:attr ="checked=${s == teacher.sex}">
<input type="submit" value="提交"/>
</form>
</body>
</html>
案例结果截图
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