SSM中实现CRUD并配置输出sql语句
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SSM中实现CRUD并配置输出sql语句
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場景
前面SSM的項目整合以及分頁等參照
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/85120936
使用log4j輸出sql語句參照:
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/85159383
項目目錄結構
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源碼下載
https://download.csdn.net/download/badao_liumang_qizhi/10867006
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實現
jsp頁面
listUser.jsp
打開listUser.jsp,添加編輯以及刪除按鈕，以及添加的表單。
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%pageContext.setAttribute("APP_PATH", request.getContextPath()); %> <!DOCTYPE html> <html> <head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>查詢所有用戶</title> </head><script type="text/javascript" src="${APP_PATH }/static/js/jquery-1.12.4.min.js"></script> <link href="${APP_PATH }/static/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet"> <script src="${APP_PATH }/static/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script> <body> <table align='center' border='1' cellspacing='0' class="table table-bordered"<th ><td>id</td><td>name</td><td>age</td><td>編輯</td><td>刪除</td></th><c:forEach items="${userList}" var="u"><tr class="active"><td >${u.id}</td><td>${u.name}</td><td>${u.age}</td><td><a href="editUser?id=${u.id}">編輯</a></td><td><a href="deleteUser?id=${u.id}">刪除</a></td></tr></c:forEach> </table> <div style="text-align:center"><a href="?start=0">首 頁</a><a href="?start=${page.start-page.count}">上一頁</a><a href="?start=${page.start+page.count}">下一頁</a><a href="?start=${page.last}">末 頁</a> </div> <form action="addUser" method="post"><div class="form-group"><label for="name">用戶名</label><input type="text" class="form-control" id="name" name ="name" placeholder="name"></div><div class="form-group"><label for="age">年齡</label><input type="number" class="form-control" id="age" name="age" placeholder="age"></div><button type="submit" class="btn btn-default">新增用戶</button> </form></body> </html>editUser.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" import="java.util.*"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><div style="width:500px;margin:0px auto;text-align:center"><div style="text-align:center;margin-top:40px"><form method="post" action="updateUser">用戶名稱： <input name="name" value="${user.name}" type="text"> <br><br>用戶年齡： <input name="age" value="${user.age}" type="text"> <br><br><input type="hidden" value="${user.id}" name="id"><input type="submit" value="編輯用戶"></form></div> </div>?
點擊新增或者編輯或者刪除時都會跳轉到后臺Controller
配置Controller
打開userController
package com.badao.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView;import com.badao.pojo.User; import com.badao.service.UserService; import com.badao.util.Page; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo;// 告訴spring mvc這是一個控制器類 @Controller @RequestMapping("") public class UserController {@AutowiredUserService userService;@RequestMapping("listUser")public ModelAndView listUser(Page page){ModelAndView mav = new ModelAndView();//根據分頁對象，進行查詢獲取查詢對象集合//List<User> cs= userService.selectAllUser(page);//int total = userService.total();//根據總數，計算最后一頁的信息PageHelper.offsetPage(page.getStart(),5);List<User> cs= userService.selectAllUser();int total = (int) new PageInfo<>(cs).getTotal();page.caculateLast(total);// 放入轉發參數mav.addObject("userList", cs);// 放入jsp路徑mav.setViewName("listUser");return mav;}@RequestMapping("addUser")public ModelAndView addUser(User user){System.out.println(user.getName());userService.addUser(user);ModelAndView mav = new ModelAndView("redirect:/listUser");return mav;}?@RequestMapping("deleteUser")public ModelAndView deleteUser(int id){userService.deleteUser(id);ModelAndView mav = new ModelAndView("redirect:/listUser");return mav;}?@RequestMapping("editUser")public ModelAndView editUser(User user){user= userService.selectUser(user.getId());ModelAndView mav = new ModelAndView("editUser");mav.addObject("user", user);return mav;}?@RequestMapping("updateUser")public ModelAndView updateUser(User user){userService.updateUser(user);ModelAndView mav = new ModelAndView("redirect:/listUser");return mav;}?}controller調用service方法
配置service
package com.badao.service;import java.util.List;import com.badao.pojo.User; import com.badao.util.Page;public interface UserService {List<User> selectAllUser();User selectUser(Integer id);void updateUser(User user);void deleteUser(int id);void addUser(User user);//List<User> selectAllUser(Page page);//int total();}配置serviceImpl
package com.badao.service.impl;import java.util.List;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;import com.badao.mapper.UserMapper; import com.badao.pojo.User; import com.badao.service.UserService; import com.badao.util.Page; @Service public class UserServiceImpl implements UserService {@AutowiredUserMapper userMapper;public List<User> selectAllUser() {// TODO Auto-generated method stubreturn userMapper.selectAllUser();} /*?@Overridepublic List<User> selectAllUser(Page page) {// TODO Auto-generated method stubreturn userMapper.selectAllUser(page);}@Overridepublic int total() {// TODO Auto-generated method stubreturn userMapper.total();}*/@Overridepublic User selectUser(Integer id) {// TODO Auto-generated method stubreturn userMapper.selectUser(id);}@Overridepublic void updateUser(User user) {// TODO Auto-generated method stubuserMapper.updateUser(user);}@Overridepublic void deleteUser(int id) {// TODO Auto-generated method stubuserMapper.deleteUser(id);}@Overridepublic void addUser(User user) {// TODO Auto-generated method stubuserMapper.addUser(user);}}配置mapper
打開mapper下的usermapper.java
package com.badao.mapper;import java.util.List; import com.badao.pojo.User; import com.badao.util.Page;public interface UserMapper {public int addUser(User user);public User selectUser(int id);public int updateUser(User user);public void deleteUser(int id);public List<User> selectAllUser();//public List<User> selectAllUser(Page page);//public int total();}打開mapper下的usermapper.xml<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.badao.mapper.UserMapper"><insert id="addUser" parameterType="User" >insert into user ( name,age ) values (#{name},#{age})??</insert><delete id="deleteUser" parameterType="_int" >delete from user where id= #{id}?</delete><select id="selectUser" parameterType="_int" resultType="User">select * from?? user? where id= #{id}??</select><update id="updateUser" parameterType="User" >updateusersetname=#{name},age=#{age} where id=#{id}??</update><select id="selectAllUser" resultType="User">select * from?? user????<!--<iftest="start!=null and count!=null">limit #{start},#{count}</if> --></select><!-- <select id="total" resultType="int">select count(*) from user</select>???? --></mapper>配置POJO
package com.badao.pojo;public class User {private Integer id;private String name;private Integer age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}}配置web.xml
加入編碼過濾器
<filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><param-name>forceEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>完整web.xml代碼
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xmlns:web="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"><filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><param-name>forceEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- spring的配置文件--><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- spring mvc核心：分發servlet --><servlet><servlet-name>mvc-dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!-- spring mvc的配置文件 --><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springMVC.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>mvc-dispatcher</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>?
運行
將源碼下載下來，或者自己搭建項目，部署到Tomcat嗎，啟動服務器。
打開瀏覽器輸入:
http://localhost:8080/ssmJarTemplate/listUser
效果
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總結
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