將HelloWorld里的addUser2方法和resultpost方法剪貼到UserController
在resultpost方法里增加數(shù)據(jù)庫(kù)寫(xiě)入代碼
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();//創(chuàng)建數(shù)據(jù)庫(kù)連接
List<User> list =session.createCriteria(UsersEntity.class).addOrder(Order.desc("id")).list();
modelMap.addAttribute("users",list);
session.close();//關(guān)閉數(shù)據(jù)庫(kù)連接
return "users";
}
@RequestMapping(value = "/resultpost",method=RequestMethod.POST)
//參數(shù)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);
//連接數(shù)據(jù)庫(kù)
Session session = DbConnector.getSession();
//開(kāi)始事務(wù)
Transaction transaction = session.beginTransaction();
//創(chuàng)建一個(gè)實(shí)體對(duì)象昔期，設(shè)置name癣防，age
UsersEntity usersEntity = new UsersEntity();
usersEntity.setName(name);
usersEntity.setAge((byte) age);
//保存
session.save(usersEntity);
//提交
transaction.commit();
//關(guān)閉數(shù)據(jù)庫(kù)連接
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文件篱昔，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>通過(guò)post傳遞參數(shù)</title>
</head>
<body>
<h1>名字：${name}</h1>
<h1>年齡：${age}</h1>
<%
response.sendRedirect("users");
%>
</body>
</html>
修改user.jsp擎椰，增加超鏈接功能膨桥，href里的“addUser2”對(duì)應(yīng)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>用戶列表</title>
</head>
<body>
<ol>
<%for (UsersEntity entity:(List<UsersEntity>)request.getAttribute("users")){%>
<li>姓名：<%out.print(entity.getName());%> 年齡：<%out.print(entity.getAge());%></li>
<%}%>
</ol>
<a href="addUser2">添加用戶</a>
</body>
</html>
