ICode9
精准搜索请尝试： 精确搜索
首页
编程语言>
数据库
系统相关
互联网
其他分享
Python
Java
JavaScript
android
PHP
首页 > 其他分享> 文章详细

SMM框架简单用户增删改查

2021-06-26 19:01:49  阅读：123  来源： 互联网

标签：int list 改查 id SMM user 增删 public User


用户增删改查

先导入jar包：
在这里插入图片描述
编写User实体类：

public class User {
    private Integer id;
    private String name;
    private String sex;
    private Integer age;
    private String address;
    @Override
    public String toString() {
        return "\nUser{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", sex=" + sex +
                ", age=" + age +
                ", address='" + address + '\'' +
                '}';
    }
//省略get set 构造方法

编写DAO接口：

public interface UserMapper {
    //查询所有用户
    public List<User> list();
    //添加用户
    int addUser(User user);
    //根据Id查询指定用户
    User getUserById(int id);
    //更改用户
    int updateUser(User user);
    //删除用户
    int delUser(Integer id);
}

编写SQL映射文件：
命名空间必须为接口完全限定类名，id值必须与接口方法名一致，

<?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="cn.user.dao.UserMapper">
    <resultMap id="BaseresultMap" type="user">
        <id property="id" column="id"/>
        <result property="name" column="name"/>
        <result property="age" column="age"/>
        <result property="sex" column="sex"/>
        <result property="address" column="address"/>
    </resultMap>
    <select id="list" resultMap="BaseresultMap">
        select * from user
    </select>
    <insert id="addUser" parameterType="user">
        insert into user(name,sex,age,address) values (#{name},#{sex},#{age},#{address})
    </insert>
    <select id="getUserById" parameterType="int" resultMap="BaseresultMap">
        select * from user where id=#{id}
    </select>
    <update id="updateUser" parameterType="user">
        update user set name=#{name},sex=#{sex},age=#{age},address=#{address} where id=#{id}
    </update>
    <delete id="delUser" parameterType="int">
        delete from user where id=#{id}
    </delete>
</mapper>

编写MyBatis配置文件：

<?xml version="1.0" encoding="UTF-8" ?>
        <!DOCTYPE configuration
                PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
                "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--设置别名-->
<typeAliases>
    <package name="cn.user.pojo"/>
</typeAliases>

<mappers>
    <!--加载SQL映射文件-->
    <mapper resource="cn/user/dao/mapper/UserMapper.xml"/>
</mappers>
</configuration>

编写Service业务层：
UserService及实现类：


public interface UserService {
    public List<User> list();//查询

    int addUser(User user);//添加

    User getUserById(int id);//根据id查询

    int updateUser(User user);修改

    int delUser(Integer id);//删除
}

实现类：别忘了给类加注解，交给Spring容器管理

@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {
//注解方式为mapper赋值
    @Resource(name = "userMapper")
    private UserMapper mapper;
    @Override
    public List<User> list() {
        return mapper.list();
    }

    @Override
    public int addUser(User user) {
        return mapper.addUser(user);
    }

    @Override
    public User getUserById(int id) {
        return mapper.getUserById(id);
    }

    @Override
    public int updateUser(User user) {
        return mapper.updateUser(user);
    }

    @Override
    public int delUser(Integer id) {
        return mapper.delUser(id);
    }
}

编写Spring配置文件：

<?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/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!--开启组件扫描-->
    <context:component-scan base-package="cn.user.dao,cn.user.service"/>
    <!--配置数据源-->
    <context:property-placeholder location="classpath:database.properties"/>
    <bean class="org.apache.commons.dbcp.BasicDataSource" id="dataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>
    <!--配置SqlSessionFactoryBean-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--扫描dao接口自动生成实现类-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <property name="basePackage" value="cn.user.dao"/>
    </bean>

    <!--配置事务处理对象-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--注解方式开启事务管理-->
    <mvc:annotation-driven transaction-manager="transactionManager"/>
</beans>

编写Controller控制器类：同样别忘了加注解。

@Controller
@RequestMapping("/user")
public class UserController {
    @Resource(name = "userService")//注解方法注入UserService实现类
    private UserService userService;
    @RequestMapping("/list")
    public String listUser(Model model){
        List<User> list = userService.list();
        model.addAttribute("users",list);
        return "main";
    }
    @GetMapping("/add")
    public String toAdd(@ModelAttribute("user") User user){
        return "add";
    }
    @PostMapping("/add")
    public void add(User user, HttpServletResponse response) throws IOException {
        int re = userService.addUser(user);
        response.getWriter().print(re);
    }
    @GetMapping("/update/{id}")
    public String toUpdate(@PathVariable("id") int id,Model model){
        User user = userService.getUserById(id);
        model.addAttribute("user",user);
        return "update";
    }
    @PostMapping("/update")
    public void update(User user, HttpServletResponse response) throws IOException {
        int re = userService.updateUser(user);
        response.getWriter().print(re);
    }
    //删除
    @GetMapping("/del/{id}")
    public String del(@PathVariable("id") Integer id){
        int re = userService.delUser(id);
        return "redirect:/user/list";
    }
}

编写SpringMVC配置文件：

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--开启组件扫描扫描controller包-->
    <context:component-scan base-package="cn.user.controller"/>
    <!--开启映射注解-->
    <mvc:annotation-driven/>
    <!--定义视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--加载nvc配置文件时一同加载spring的配置文件-->
    <import resource="classpath:application.xml"/>
</beans>

在web.xml中定义前端控制器，以及乱码处理等。。。。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--定义前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <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>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--处理中文乱码-->
    <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>
    <!--静态资源处理-->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.js</url-pattern>
        <url-pattern>*.html</url-pattern>
        <url-pattern>*.jpg</url-pattern>
        <url-pattern>*.png</url-pattern>
        <url-pattern>*.css</url-pattern>
    </servlet-mapping>
</web-app>

编写页面开始测试：
main.jsp页面：查询所有用户

<head>
    <title>所有用户</title>
    <script type="text/javascript" src="${pageContext.servletContext.contextPath}/static/js/jquery-1.12.4.js"></script>
</head>
<body>
<a href="${pageContext.servletContext.contextPath}/user/add">添加用户</a>
<table border="1px" width="700px">
    <tr>
        <td>序号</td>
        <td>姓名</td>
        <td>性别</td>
        <td>年龄</td>
        <td>地址</td>
        <td>操作</td>
    </tr>
    <c:forEach items="${requestScope.users}" varStatus="i" var="user">
        <tr>
            <td>${i.count}</td>
            <td>${user.name}</td>
            <td>${user.sex}</td>
            <td>${user.age}</td>
            <td>${user.address}</td>
            <%--REST风格从页面到controller传递数据--%>
            <td><a href="${pageContext.servletContext.contextPath}/user/update/${user.id}">修改</a>
                <a href="${pageContext.servletContext.contextPath}/user/del/${user.id}">删除</a></td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

点击添加进入到user/add方法Get请求：

  @GetMapping("/add")
    public String toAdd(@ModelAttribute("user") User user){
        return "add";
    }

准备好user对象跳转到add.jsp添加页面：

<html>
<head>
    <title>添加用户</title>
    <script type="text/javascript" src="${pageContext.servletContext.contextPath}/static/js/jquery-1.12.4.js"></script>
</head>
<body>
    <fm:form id="addfrom" modelAttribute="user">
        姓名：<fm:input path="name"/><br>
        性别：<fm:radiobutton path="sex" value="男" checked="checked"/>男<fm:radiobutton path="sex" value="女"/>女<br>
        年龄：<fm:input path="age"/><br>
        地址：<fm:input path="address"/><br>
        <input type="button" value="添加" id="tianjia">
    </fm:form>
    <script type="text/javascript">
        $(function () {
            $("#tianjia").click(function () {
                /*序列化表单中的数据*/
                var input = $("#addfrom").serialize();
                $.post("${pageContext.servletContext.contextPath}/user/add",input,function (data) {
                    if (data!=-1){
                        alert("添加成功");
                        window.location.href="${pageContext.servletContext.contextPath}/user/list";
                    }else{
                        alert("添加失败");
                    }
                });
            });
        });
    </script>
</body>
</html>

异步方式添加用户，点击添加按钮跳转到user/add方法Post请求方式：然后返回结果data，添加成功跳转到user/list方法，然后在跳转到main.jsp页面

 @PostMapping("/add")
    public void add(User user, HttpServletResponse response) throws IOException {
        int re = userService.addUser(user);
        //返回执行结果
        response.getWriter().print(re);
    }

点击修改超链接传入当前用户ID跳转到user/update方法Get请求:

@GetMapping("/update/{id}")
    public String toUpdate(@PathVariable("id") int id,Model model){
    	//根据id查出要修改的用户对象
        User user = userService.getUserById(id);
        把用户存入model中在jsp页面中显示
        model.addAttribute("user",user);
        //跳转到update.jsp页面
        return "update";
    }

update.jsp页面：异步方式修改用户信息

<html>
<head>
    <title>修改用户</title>
    <script type="text/javascript" src="${pageContext.servletContext.contextPath}/static/js/jquery-1.12.4.js"></script>
</head>
<body>
    <fm:form id="updatefrom" modelAttribute="user">
        <fm:hidden path="id"/>
    姓名：<fm:input path="name"/><br>
    性别：<fm:radiobutton path="sex" value="男" checked="checked"/>男<fm:radiobutton path="sex" value="女"/>女<br>
    年龄：<fm:input path="age"/><br>
    地址：<fm:input path="address"/><br>
    <input type="button" value="修改" id="xiugai">
    </fm:form>
    <script type="text/javascript">
        $(function () {
            $("#xiugai").click(function () {
                /*序列化表单中的数据*/
                var input = $("#updatefrom").serialize();
                $.post("${pageContext.servletContext.contextPath}/user/update",input,function (data) {
                    if (data!=-1){
                        alert("修改成功");
                        window.location.href="${pageContext.servletContext.contextPath}/user/list";
                    }else{
                        alert("修改失败");
                    }
                });
            });
        });
    </script>
</body>
</html>

点击修改跳转到user/update方法POST请求方式：返回然后返回执行结果data修改成功后跳转到user./list方法跳转到main.jsp页面。

@PostMapping("/update")
    public void update(User user, HttpServletResponse response) throws IOException {
        int re = userService.updateUser(user);
        //返回给update.jsp页面执行结果
        response.getWriter().print(re);
    }

点击删除传入当前用户id并跳转到/user/del方法中get请求：

 //删除
    @GetMapping("/del/{id}")
    //接受用户的id值
    public String del(@PathVariable("id") Integer id){
        int re = userService.delUser(id);
        return "redirect:/user/list";
    }

删除成功后重定向到user/list方法然后跳转到main.jsp页面

标签：int,list,改查,id,SMM,user,增删,public,User
来源： https://blog.csdn.net/yananye/article/details/118252819

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

关于我们 | 联系我们 | 留言反馈

专注分享技术，共同学习，共同进步。侵权联系[81616952@qq.com]

Copyright (C)ICode9.com, All Rights Reserved.

ICode9版权所有