将HelloWorld里的addUser2方法和resultpost方法剪贴到UserController
在resultpost方法里增加数据库写入代码
package SpringmvcDemo.Controllers;
import SpringmvcDemo.DB.DbConnector;
import SpringmvcDemo.DB.entity.UsersEntity;
import SpringmvcDemo.User;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Order;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
@Controller
public class UserController {
@RequestMapping(value = "/users",method = RequestMethod.GET)
public String allUsers(ModelMap modelMap){
Session session = DbConnector.getSession();//创建数据库连接
List<User> list =session.createCriteria(UsersEntity.class).addOrder(Order.desc("id")).list();
modelMap.addAttribute("users",list);
session.close();//关闭数据库连接
return "users";
}
@RequestMapping(value = "/resultpost",method=RequestMethod.POST)
//参数里增加HttpServletRequest request
public String resultpost(ModelMap modelMap, @RequestParam String name, @RequestParam int age, HttpServletRequest request){
modelMap.addAttribute("name",name);
modelMap.addAttribute("age",age);
//连接数据库
Session session = DbConnector.getSession();
//开始事务
Transaction transaction = session.beginTransaction();
//创建一个实体对象，设置name，age
UsersEntity usersEntity = new UsersEntity();
usersEntity.setName(name);
usersEntity.setAge((byte) age);
//保存
session.save(usersEntity);
//提交
transaction.commit();
//关闭数据库连接
session.close();
return "resultpost";
}
@RequestMapping(value="/addUser2",method = RequestMethod.GET)
public String addUser2(ModelMap modelMap){
User u = new User();
u.setName("hi");
modelMap.addAttribute("user",u);
return "adduser_springmvc";
}
}
修改resultpost.jsp文件，增加重定向
<%--
Created by IntelliJ IDEA.
User: 15435
Date: 2019/1/14
Time: 11:09
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>通过post传递参数</title>
</head>
<body>
<h1>名字：${name}</h1>
<h1>年龄：${age}</h1>
<%
response.sendRedirect("users");
%>
</body>
</html>
修改user.jsp，增加超链接功能，href里的“addUser2”对应的是UserController里的addUser2方法
<%@ page import="SpringmvcDemo.DB.entity.UsersEntity" %>
<%@ page import="java.util.List" %>
<%@ page pageEncoding="utf-8" %>
<html>
<head>
<title>用户列表</title>
</head>
<body>
<ol>
<%for (UsersEntity entity:(List<UsersEntity>)request.getAttribute("users")){%>
<li>姓名：<%out.print(entity.getName());%> 年龄：<%out.print(entity.getAge());%></li>
<%}%>
</ol>
<a href="addUser2">添加用户</a>
</body>
</html>
