詳細記錄->使用Maven+SSM框架，實現單表簡單的增刪改查
阿新 • • 發佈：2018-11-15
話不多說，ssm框架整合小列子，這次記錄一個單表增刪改查的ssm例子，所以才手寫mapper，平時我都是用逆向工程自動生成mapper，簡單方便。
需要了解逆向工程請看：https://blog.csdn.net/Destiny_strive/article/details/82915354
步驟
4.新增spring配置檔案：applicationContext.xml
5.新增springMVC配置檔案：springMVC.xml
9.編寫dao層->mapper介面和xml檔案 ：UserMapper.java、UserMapper.xml
10.編寫service層->UserService.java、UserServiceImpl.java
11.編寫controller層->UserController.java
12.在jsp資料夾下建立edit.jsp和view.jsp
13.現在配置tomcat執行就能看到user表的列表了,可操作做增刪改查
1.建立web Maven專案
建立專案很簡單的，不做描述，接下來在pom檔案加入專案所需依賴：
<dependencies> <!--Spring框架核心庫 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>4.2.4.RELEASE</version> </dependency> <!-- Spring Web --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.2.4.RELEASE</version> </dependency> <!--連線驅動--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency> <!--資料來源--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version> </dependency> <!-- mybatis ORM框架 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.1</version> </dependency> <!--mybatis-spring介面卡 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <!--整合mybatis如果不加這個包會報錯 java.lang.NoClassDefFoundError: org/springframewor--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.2.4.RELEASE</version> </dependency> <!--測試--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!--引入JSTL標籤--> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> </dependencies>
2.建立資料庫配置檔案：jdbc.properties
resources目錄下新增：jdbc.properties
這裡根據自己資料庫做相應修改
#資料庫配置檔案
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=admin3.專案總體目錄：
先給出專案總體目錄
建立好java目錄下的分層的包，resources下建立存放mapper的包，WEB-INF下建立jsp放跳轉的頁面（下面的配置檔案中會配置這些路徑）
4.新增spring配置檔案：applicationContext.xml
resources目錄下新增：applicationContext.xml，檔案內容如下：
每個配置給出了相應的註釋，請自行檢視
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<!-- 匯入資料庫配置檔案 -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 掃描包 這裡的包需要根據自己java目錄下的包名修改 -->
<context:component-scan base-package="com.demo.service" />
<!-- 配置資料庫連線池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<!-- 基本屬性 url、user、password -->
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<!--Mybatis的SessionFactory配置-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="typeAliasesPackage" value="com.demo.pojo" />
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>
<!--Mybatis的Mapper檔案識別-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.demo.dao"/>
</bean>
</beans>5.新增springMVC配置檔案：springMVC.xml
resources目錄下新增：springMVC.xml，並且根據檔案中‘檢視定位’的配置，所以在WEB-INF下建立jsp資料夾
檔案內容如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<context:component-scan base-package="com.demo.controller" />
<!--
配置如果沒有<mvc:annotation-driven/>，
那麼所有的Controller可能就沒有解析，所有當有請求時候都沒有匹配的處理請求類，
就都去<mvc:default-servlet-handler/>即default servlet處理了。
新增上<mvc:annotation-driven/>後，
相應的do請求被Controller處理，而靜態資源因為沒有相應的Controller就會被default servlet處理。
總之沒有相應的Controller就會被default servlet處理就ok了。
-->
<mvc:annotation-driven />
<!--開通靜態資源的訪問-->
<mvc:default-servlet-handler />
<!-- 檢視定位 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>6.修改web.xml
<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<!-- spring的配置檔案-->
<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>
<!--中文過濾器-->
<filter>
<filter-name>CharacterEncodingFilter</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>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 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的配置檔案 -->
<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>7.建立資料庫相關表
我的jdbc.properties檔案中指明瞭資料庫名為test，在test資料庫下我建立了一張user表，結構和資料如下：
8.根據資料庫表建立pojo類：User.java
pojo的編寫規則：資料庫欄位對應類欄位，欄位型別要一直 。
package com.demo.pojo;
public class User {
private Integer id;
private String name;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
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 == null ? null : name.trim();
}
}9.編寫dao層->mapper介面和xml檔案 ：UserMapper.java、UserMapper.xml
UserMapper.xml放在resources\mapper下，UserMapper.java放在com.demo.dao這個包下：
注意namespace="com.demo.dao.UserMapper"，這裡一定寫對應的mapper介面具體路徑
UserMapper介面的編寫規則：
(1）方法名和對應的mapper配置檔案中查詢語句的id相同
（2）返回型別和resultType的型別一致，沒有就是void。
（3）方法中的引數列表中的型別和parameterType一致。
（4）mapper配置檔案的namespace對應mapper介面類的全路徑。
package com.demo.dao;
import com.demo.pojo.User;
import java.util.List;
public interface UserMapper {
List<User> list();
void del(int id);
void update(User user);
void add(User user);
User get(int id);
}<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.demo.dao.UserMapper" >
<select id="list" resultType="user">
select * from user
</select>
<update id="update" parameterType="user">
update user set name=#{name} ,password=#{password} where id=#{id}
</update>
<insert id="add" parameterType="user">
insert into user values (null,#{name},#{password});
</insert>
<delete id="del">
delete from user where id=#{id}
</delete>
<select id="get" resultType="user">
select * from user where id =#{id}
</select>
</mapper>10.編寫service層->UserService.java、UserServiceImpl.java
UserService.java:
package com.demo.service;
import com.demo.pojo.User;
import java.util.List;
public interface UserService {
List<User> list();
void delUser(int id);
void updateUser(User user);
void addUser(User user);
User get(int id);
}UserServiceImpl.java
package com.demo.service.impl;
import com.demo.dao.UserMapper;
import com.demo.pojo.User;
import com.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService{
@Autowired
UserMapper userMapper;
public List<User> list() {
return userMapper.list();
}
public void addUser(User user) {
userMapper.add(user);
}
public void delUser(int id) {
userMapper.del(id);
}
public void updateUser(User user) {
userMapper.update(user);
}
public User get(int id) {
return userMapper.get(id);
}
}
11.編寫controller層->UserController.java
package com.demo.controller;
import com.demo.pojo.User;
import com.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
@Controller
@RequestMapping("")
public class UserController {
@Autowired
UserService userService;
@RequestMapping("list")
public String list(Model model){
List<User> us= userService.list();
model.addAttribute("us", us);
return "view";
}
@RequestMapping("add")
public String add(User user,Model model){
userService.addUser(user);
return "redirect:list";
}
@RequestMapping("del")
public String del(int id){
userService.delUser(id);
return "redirect:list";
}
@RequestMapping("editUI")
public String editUI(int id,Model model){
User user = userService.get(id);
model.addAttribute("user",user);
return "edit";
}
@RequestMapping("update")
public String update(User user){
userService.updateUser(user);
return "redirect:list";
}
}
12.在jsp資料夾下建立edit.jsp和view.jsp
view.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
<style>
table,table tr th, table tr td { border:1px solid rgba(41, 36, 35, 0.96); }
#mytable{width:300px;margin: 100px auto}
#add{width:300px;height:500px;margin: 100px auto}
</style>
</head>
<body>
<div id="list">
<table id="mytable">
<thead>
<th>id</th>
<th>名字</th>
<th>密碼</th>
<th>修改</th>
<th>刪除</th>
</thead>
<tbody>
<c:forEach items="${us}" var="user">
<tr>
<td>${user.id}</td>
<td>${user.name}</td>
<td>${user.password}</td>
<td><a href="editUI?id=${user.id}">edit</a> </td>
<td><a href="del?id=${user.id}">delete</a></td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
<div id="add">
<form action="/add">
姓名：<input type="text" name="name" value=""/><br/>
密碼：<input type="text" name="password" value=""/><br/>
<button type="submit">新增</button>
</form>
</div>
</body>
</html>edit.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<style>
#edit{width:300px;height:500px;margin: 100px auto}
</style>
</head>
<body>
<div id="edit">
<form action="/update">
姓名：<input type="text" name="name" value="${user.name}"/><br/>
密碼：<input type="text" name="password" value="${user.password}"/><br/>
<input type="hidden" value="${user.id}" name="id">
<button type="submit" value="">修改</button>
</form>
</div>
</body>
</html>最後把index.jsp內容修改為:
<%
response.sendRedirect(request.getContextPath()+"/list");
%>
