详细记录->使用Maven+SSM框架,实现单表简单的增删改查
话不多说,ssm框架整合小列子,这次记录一个单表增删改查的ssm例子,所以才手写mapper,平时我都是用逆向工程自动生成mapper,简单方便。
需要了解逆向工程请看:https://blog.csdn.net/Destiny_strive/article/details/82915354
步骤
4.添加spring配置文件:applicationContext.xml
5.添加springMVC配置文件:springMVC.xml
9.编写dao层->mapper接口和xml文件 :UserMapper.java、UserMapper.xml
10.编写service层->UserService.java、UserServiceImpl.java
11.编写controller层->UserController.java
12.在jsp文件夹下创建edit.jsp和view.jsp
13.现在配置tomcat运行就能看到user表的列表了,可操作做增删改查
1.创建web Maven项目
创建项目很简单的,不做描述,接下来在pom文件加入项目所需依赖:
[code]<dependencies> <!--Spring框架核心库 --> <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> <!--连接驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency> <!--数据源--> <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适配器 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <!--整合mybatis如果不加这个包会报错 java.lang.NoClassDefFoundError: org/springframewor--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.2.4.RELEASE</version> </dependency> <!--测试--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!--引入JSTL标签--> <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.创建数据库配置文件:jdbc.properties
resources目录下添加:jdbc.properties
这里根据自己数据库做相应修改
[code]#数据库配置文件 jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=admin
3.项目总体目录:
先给出项目总体目录
创建好java目录下的分层的包,resources下创建存放mapper的包,WEB-INF下创建jsp放跳转的页面(下面的配置文件中会配置这些路径)
4.添加spring配置文件:applicationContext.xml
resources目录下添加:applicationContext.xml,文件内容如下:
每个配置给出了相应的注释,请自行查看
[code]<?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"> <!-- 导入数据库配置文件 --> <context:property-placeholder location="classpath:jdbc.properties"/> <!-- 扫描包 这里的包需要根据自己java目录下的包名修改 --> <context:component-scan base-package="com.demo.service" /> <!-- 配置数据库连接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <!-- 基本属性 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文件识别--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.demo.dao"/> </bean> </beans>
5.添加springMVC配置文件:springMVC.xml
resources目录下添加:springMVC.xml,并且根据文件中‘视图定位’的配置,所以在WEB-INF下创建jsp文件夹
文件内容如下:
[code]<?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" /> <!-- 配置如果没有<mvc:annotation-driven/>, 那么所有的Controller可能就没有解析,所有当有请求时候都没有匹配的处理请求类, 就都去<mvc:default-servlet-handler/>即default servlet处理了。 添加上<mvc:annotation-driven/>后, 相应的do请求被Controller处理,而静态资源因为没有相应的Controller就会被default servlet处理。 总之没有相应的Controller就会被default servlet处理就ok了。 --> <mvc:annotation-driven /> <!--开通静态资源的访问--> <mvc:default-servlet-handler /> <!-- 视图定位 --> <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
[code]<?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> <!--中文过滤器--> <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:分发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>
7.创建数据库相关表
我的jdbc.properties文件中指明了数据库名为test,在test数据库下我创建了一张user表,结构和数据如下:
8.根据数据库表创建pojo类:User.java
pojo的编写规则:数据库字段对应类字段,字段类型要一直 。
[code]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.编写dao层->mapper接口和xml文件 :UserMapper.java、UserMapper.xml
UserMapper.xml放在resources\mapper下,UserMapper.java放在com.demo.dao这个包下:
注意namespace="com.demo.dao.UserMapper",这里一定写对应的mapper接口具体路径
UserMapper接口的编写规则:
(1)方法名和对应的mapper配置文件中查询语句的id相同
(2)返回类型和resultType的类型一致,没有就是void。
(3)方法中的参数列表中的类型和parameterType一致。
(4)mapper配置文件的namespace对应mapper接口类的全路径。
[code]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); }
[code]<?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.编写service层->UserService.java、UserServiceImpl.java
UserService.java:
[code]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
[code]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.编写controller层->UserController.java
[code]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文件夹下创建edit.jsp和view.jsp
view.jsp:
[code]<%@ 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>密码</th> <th>修改</th> <th>删除</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=${user.id}">delete</a></td> </tr> </c:forEach> </tbody> </table> </div> <div id="add"> <form action="/add"> 姓名:<input type="text" name="name" value=""/><br/> 密码:<input type="text" name="password" value=""/><br/> <button type="submit">添加</button> </form> </div> </body> </html>
edit.jsp:
[code]<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> <style> #edit{width:300px;height:500px;margin: 100px auto} </style> </head> <body> <div id="edit"> <form action="/update"> 姓名:<input type="text" name="name" value="${user.name}"/><br/> 密码:<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>
最后把index.jsp内容修改为:
[code]<% response.sendRedirect(request.getContextPath()+"/list"); %>
13.现在配置tomcat运行就能看到user表的列表了,可操作做增删改查
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