Spring MVC

Posted 2021-11-24 小企鹅推雪球!

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文章目录

Spring MVC文本域

创建一个名称为 TextArea 的动态WEB项目。
在 com.yiibai.springmvc 包下创建两个Java类User，UserController
在jsp子文件夹下创建两个视图文件：user.jsp，userlist.jsp

**User.java **

package com.yiibai.springmvc;

public class User {

   private String username;
   private String password;
   private String address;

   public String getUsername() {
      return username;
   }
   public void setUsername(String username) {
      this.username = username;
   }

   public String getPassword() {
      return password;
   }
   public void setPassword(String password) {
      this.password = password;
   }
   public String getAddress() {
      return address;
   }
   public void setAddress(String address) {
      this.address = address;
   }
}

UserController.java

package com.yiibai.springmvc;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap;

@Controller
public class UserController {

   @RequestMapping(value = "/user", method = RequestMethod.GET)
   public ModelAndView user() {
      return new ModelAndView("user", "command", new User());
   }

   @RequestMapping(value = "/addUser", method = RequestMethod.POST)
   public String addUser(@ModelAttribute("SpringWeb")User user, 
      ModelMap model) {
      model.addAttribute("username", user.getUsername());
      model.addAttribute("password", user.getPassword());
      model.addAttribute("address", user.getAddress());

      return "userlist";
   }
}

第一个服务方法user(),已经在ModelAndView对象中传递了一个名称为“command”的空User对象，因为如果在JSP文件中使用form:form标签，spring框架需要一个名称为“command”的对象。所以当调用user()方法时，它返回user.jsp视图。
第二个服务方法addUser()将根据URL => TextArea/addUser 上的POST方法请求时调用。根据提交的信息准备模型对象。最后从服务方法返回“userlist”视图，这将呈现userlist.jsp视图。

user.jsp 的代码

<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
   <title>Spring MVC表单处理(文本域)</title>
</head>
<body>

<h2>用户信息</h2>
<form:form method="POST" action="/TextArea/addUser">
   <table>
      <tr>
         <td><form:label path="username">用户名：</form:label></td>
         <td><form:input path="username" /></td>
      </tr>
      <tr>
         <td><form:label path="password">密码：</form:label></td>
         <td><form:password path="password" /></td>
      </tr>  
      <tr>
         <td><form:label path="address">地址：</form:label></td>
         <td><form:textarea path="address" rows="5" cols="30" /></td>
      </tr>  
      <tr>
         <td colspan="2">
            <input type="submit" value="提交"/>
         </td>
      </tr>
   </table>  
</form:form>
</body>
</html>

userlist.jsp

<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
    <title>Spring MVC表单处理之-密码</title>
</head>
<body>

<h2>提交的用户信息</h2>
   <table>
      <tr>
         <td>用户名：</td>
         <td>${username}</td>
      </tr>
      <tr>
         <td>密码：</td>
         <td>${password}</td>
      </tr>    
   </table>  
</body>
</html>

Spring MVC复选框

创建一个名称为 Checkbox 的动态WEB项目。
在 com.yiibai.springmvc 包下创建两个Java类User，UserController
在jsp子文件夹下创建两个视图文件：user.jsp，userlist.jsp

User.java

package com.yiibai.springmvc;

public class User {

   private String username;
   private String password;
   private String address;
   private boolean receivePaper;    

   public String getUsername() {
      return username;
   }
   public void setUsername(String username) {
      this.username = username;
   }

   public String getPassword() {
      return password;
   }
   public void setPassword(String password) {
      this.password = password;
   }
   public String getAddress() {
      return address;
   }
   public void setAddress(String address) {
      this.address = address;
   }
   public boolean isReceivePaper() {
      return receivePaper;
   }
   public void setReceivePaper(boolean receivePaper) {
      this.receivePaper = receivePaper;
   }
}

UserController.java

package com.yiibai.springmvc;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap;

@Controller
public class UserController {

   @RequestMapping(value = "/user", method = RequestMethod.GET)
   public ModelAndView user() {
      return new ModelAndView("user", "command", new User());
   }

   @RequestMapping(value = "/addUser", method = RequestMethod.POST)
   public String addUser(@ModelAttribute("SpringWeb")User user, 
      ModelMap model) {
      model.addAttribute("username", user.getUsername());
      model.addAttribute("password", user.getPassword());
      model.addAttribute("address", user.getAddress());
      model.addAttribute("receivePaper", user.isReceivePaper());
      return "userlist";
   }
}

user.jsp

<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
   <title>Spring MVC表单处理(复选框)</title>
</head>
<body>

<h2>用户信息 - </h2>
<form:form method="POST" action="/Checkbox/addUser">
   <table>
      <tr>
         <td><form:label path="username">用户名：</form:label></td>
         <td><form:input path="username" /></td>
      </tr>
      <tr>
         <td><form:label path="password">密码：</form:label></td>
         <td><form:password path="password" /></td>
      </tr>  
      <tr>
         <td><form:label path="address">地址：</form:label></td>
         <td><form:textarea path="address" rows="5" cols="30" /></td>
      </tr>  
      <tr>
         <td><form:label path="receivePaper">订阅新闻？</form:label></td>
         <td><form:checkbox path="receivePaper" /></td>
      </tr> 
      <tr>
         <td colspan="2">
            <input type="submit" value="提交"/>
         </td>
      </tr>
   </table>  
</form:form>
</body>
</html>

userlist.jsp

<%@ page contentType="text/html; charset=UTF-8"%>

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
    <title>Spring MVC表单处理(复选框)</title>
</head>
<body>

<h2>提交的用户信息</h2>
   <table>
      <tr>
         <td>用户名：</td>
         <td>${username}</td>
      </tr>
      <tr>
         <td>密码：</td>
         <td>${password}</td>
      </tr>    
      <tr>
         <td>地址：</td>
         <td>${address}</td>
      </tr>  
      <tr>
         <td>是否订阅新闻</td>
         <td>${receivePaper}</td>
      </tr>          
   </table>  
</body>
</html>

Spring MVC复选框(多项)

创建一个名称为 Checkboxes 的动态WEB项目
在 com.yiibai.springmvc 包下创建两个Java类User，UserController
在jsp子文件夹下创建两个视图文件：user.jsp，userlist.jsp

User.java

package com.yiibai.springmvc;

public class User {

   private String username;
   private String password;
   private String address;
   private boolean receivePaper;
   private String [] favoriteFrameworks;   

   public String getUsername() {
      return username;
   }
   public void setUsername(String username) {
      this.username = username;
   }

   public String getPassword() {
      return password;
   }
   public void setPassword(String password) {
      this.password = password;
   }
   public String getAddress() {
      return address;
   }
   public void setAddress(String address) {
      this.address = address;
   }
   public boolean isReceivePaper() {
      return receivePaper;
   }
   public void setReceivePaper(boolean receivePaper) {
      this.receivePaper = receivePaper;
   }
   public String[] getFavoriteFrameworks() {
      return favoriteFrameworks;
   }
   public void setFavoriteFrameworks(String[] favoriteFrameworks) {
      this.favoriteFrameworks = favoriteFrameworks;
   }
}

UserController.java

package com.yiibai.springmvc;
import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap;

@Controller
public class UserController {

   @RequestMapping(value = "/user", method = RequestMethod.GET)
   public ModelAndView user() {
      User user = new User();      
      user.setFavoriteFrameworks((new String []{"Spring MVC","Struts 2"}));
      ModelAndView modelAndView = new ModelAndView("user", "command", user);
      return modelAndView;
   }

   @RequestMapping(value = "/addUser", method = RequestMethod.POST)
   public String addUser(@ModelAttribute("SpringWeb")User user, 
      ModelMap model) {
      model.addAttribute("username", user.getUsername());
      model.addAttribute("password", user.getPassword());
      model.addAttribute("address", user.getAddress());
      model.addAttribute("receivePaper", user.isReceivePaper());
      model.addAttribute("favoriteFrameworks", user.getFavoriteFrameworks());
      return "userlist";
   }

   @ModelAttribute("webFrameworkList")
   public List<String> getWebFrameworkList()
   {
      List<String> webFrameworkList = new ArrayList<String>();
      webFrameworkList.add("Spring MVC");
      webFrameworkList.add("Spring Boot");
      webFrameworkList.add("Struts 2");
      webFrameworkList.add("Apache Hadoop");
      return webFrameworkList;
   }
}

user.jsp

<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
   <title>Spring MVC表单处理(复选框)</title>
</head>
<body>

<h2>用户信息 - </h2>
<form:form method="POST" action="/Checkbox/addUser">
   <table>
      <tr>
         <td><form:label path="username">用户名：</form:label></td>
         <td><form:input path="username" /></td>
      </tr>
      <tr>
         <td><form:label path="password">密码：</form:label></td>
         <td><form:password path="password" /></td>
      </tr>  
      <tr>
         <td><form:label path="address">地址：</form:label></td>
         <td><form:textarea path="address" rows="5" cols="30" /></td>
      </tr>  
      <tr>
         <td><form:label path="receivePaper">订阅新闻？</form:label></td>
         <td><form:checkbox path="receivePaper" /></td>
      </tr> 
      <tr>
         <td colspan="2">
            <input type="submit" value="提交"/>
         </td>
      </tr>
   </table>  
</form:form>
</body>
</html>

使用<form:checkboxes />标签来呈现HTML多个复选框

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