假定你已经具备开发环境,读过前几篇文章,如:Spring MVC,绑定默认数据
一、绑定数组
1.1 创建前台页面,位于:WEB-INFjsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>用户列表</title> </head> <body> <form action="${pageContext.request.contextPath }/deleteUsers" method="post"> <table width="20%" border=1> <tr> <td>选择</td> <td>用户名</td> </tr> <tr> <td><input name="ids" value="1" type="checkbox"></td> <td>tom</td> </tr> <tr> <td><input name="ids" value="2" type="checkbox"></td> <td>jack</td> </tr> <tr> <td><input name="ids" value="3" type="checkbox"></td> <td>lucy</td> </tr> </table> <input type="submit" value="删除"/> </form> </body> </html>
1.2 创建后台控制器
package com.itheima.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class UserController { /** * 向用户列表页面跳转 */ @RequestMapping("/toUser") public String selectUsers( ) { return "user"; } /** * 接收批量删除用户的方法 */ @RequestMapping("/deleteUsers") public String deleteUsers(Integer[] ids) { if(ids !=null){ for (Integer id : ids) { // 使用输出语句模拟已经删除了用户 System.out.println("删除了id为"+id+"的用户!"); } }else{ System.out.println("ids=null"); } return "success"; } }
1.3 测试,打开页面:http://localhost:8080/ssm/toUser
提交,后台显示:
二、绑定集合
2.1 创建前台页面,位于:WEB-INFjsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>修改用户</title> </head> <body> <form action="${pageContext.request.contextPath }/editUsers" method="post" id='formid'> <table width="30%" border=1> <tr> <td>选择</td> <td>用户名</td> </tr> <tr> <td> <input name="users[0].id" value="1" type="checkbox" /> </td> <td> <input name="users[0].username" value="tome" type="text" /> </td> </tr> <tr> <td> <input name="users[1].id" value="2" type="checkbox" /> </td> <td> <input name="users[1].username" value="jack" type="text" /> </td> </tr> </table> <input type="submit" value="修改" /> </form> </body> </html>
2.2 创建后台控制器
package com.itheima.controller; import java.util.List; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.itheima.po.User; import com.itheima.po.UserVO; @Controller public class UserController { /** * 向用户列表页面跳转 */ @RequestMapping("/toUser") public String selectUsers() { return "user"; } /** * 接收批量删除用户的方法 */ @RequestMapping("/deleteUsers") public String deleteUsers(Integer[] ids) { if (ids != null) { for (Integer id : ids) { // 使用输出语句模拟已经删除了用户 System.out.println("删除了id为" + id + "的用户!"); } } else { System.out.println("ids=null"); } return "success"; } /** * 向用户批量修改页面跳转 */ @RequestMapping("/toUserEdit") public String toUserEdit() { return "user_edit"; } /** * 接收批量修改用户的方法 */ @RequestMapping("/editUsers") public String editUsers(UserVO userList) { // 将所有用户数据封装到集合中 List<User> users = userList.getUsers(); // 循环输出所有用户信息 for (User user : users) { // 如果接收的用户id不为空,则表示对该用户进行了修改 if (user.getId() != null) { System.out.println("修改了id为" + user.getId() + "的用户名为:" + user.getUsername()); } } return "success"; } }
2.3 相关实体类(两个)
package com.itheima.po; import java.util.List; /** * 用户持久化类 */ public class User { private Integer id; // 用户编号 private String username; // 用户姓名 private String address; // 用户地址 private List<Orders> ordersList; //用户关联的订单 public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public List<Orders> getOrdersList() { return ordersList; } public void setOrdersList(List<Orders> ordersList) { this.ordersList = ordersList; } @Override public String toString() { return "User [id=" + id + ", username=" + username + ", address=" + address + ", ordersList=" + ordersList + "]"; } }
package com.itheima.po; import java.util.List; import com.itheima.po.User; /** * 用户包装类 */ public class UserVO { private List<User> users; public List<User> getUsers() { return users; } public void setUsers(List<User> users) { this.users = users; } }
2.4 测试,打开页面:http://localhost:8080/ssm/toUserEdit
勾选核选框(必须),修改名称,提交,后台显示: