JavaEE的用户例子

JavaEE的用户例子

• 工具IDEA
• 创建maven项目的webapp文件
• SQL数据文件
• 采用User表自己建。
• 具体操作：
• 补充pom.xml文件：
• 完善java文件：
• UserControlle
• User
• UserMapper
• UserService
• UserServicelmpl
• 配置xml文件：
• UserMapper.xml
• spring.xml
• springmvc.xml
• web.xml
• 构造jsp文件
• index.jsp
• loginsuccess.jsp
• register.jsp

工具IDEA

创建maven项目的webapp文件

SQL数据文件

采用User表自己建。

具体操作：

###结构如下：

补充pom.xml文件：

   <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>
    <!-- 作用域使用provided -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <!-- 作用域使用provided -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.2</version>
    </dependency>

    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.5.2</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.4</version>
    </dependency>

完善java文件：

UserControlle

package com.lky.controller;

import com.lky.entity.User;
import com.lky.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;
import java.util.Map;
@Controller
@RequestMapping("login")
public class UserController {
    @Autowired
    UserService userService;
    @RequestMapping("/dologin")
    public String login(String username, String password, Map<String, Object> map, HttpSession session) {
        if (username == null || "".equals(username)) {
            map.put("error","用户名为空");
            return "index";
        }
        if (password == null || "".equals(password)) {
            map.put("error","密码为空");
            return "index";
        }
        User user = userService.getUser(username, password);
        if (user == null){
            map.put("error", "用户名或密码错误");
            return "index";
        }
        session.setAttribute("username", username);
        return "redirect:../loginsuccess.jsp";
    }
    @RequestMapping("/register")
    public String register() {
        return "register";
    }
    @RequestMapping("/doRegister")
    public String doRegister(String username, String password, Map<String, Object> map, HttpSession session) {
        if (username == null || "".equals(username)) {
            map.put("error","用户名为空");
            return "register";
        }
        if (password == null || "".equals(password)) {
            map.put("error","密码为空");
            return "register";
        }
        userService.insertUser(username, password);
        return "redirect:../index.jsp";
    }
}

User

package com.lky.entity;

public class User {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

UserMapper

package com.lky.mapper;

import com.lky.entity.User;
import org.apache.ibatis.annotations.Param;

public interface UserMapper {
    // 查询指定用户名和密码的User
    User getUser(@Param("username") String username, @Param("password") String password);
    // 保存指定用户名和密码的user
    void saveUser(@Param("username") String username, @Param("password") String password);
}

UserService

package com.lky.service;
import com.lky.entity.User;
public interface UserService {
    User getUser(String username, String password);
    void insertUser(String username, String password);
}

UserServicelmpl

package com.lky.service.lmpl;

import com.lky.entity.User;
import com.lky.mapper.UserMapper;
import com.lky.service.UserService;
import org.apache.ibatis.session.SqlSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Service
public class UserServicelmpl implements UserService {
    @Autowired
    SqlSession sqlSession;
    @Override
    @Transactional(readOnly = true)
    public User getUser(String username, String password) {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.getUser(username, password);
        System.out.println(user);
        return user;
    }
    @Override
    @Transactional(propagation = Propagation.REQUIRED)
    public void insertUser(String username, String password) {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        mapper.saveUser(username, password);
    }
}

配置xml文件：

UserMapper.xml

<?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.lky.mapper.UserMapper">

    <select id="getUser" resultType="com.lky.entity.User">
       select * from user where username=#{username} and password=#{password}
   </select>

    <insert id="saveUser">
       INSERT INTO user (username,password) VALUES (#{username}, #{password})
   </insert>
</mapper>

spring.xml

<?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://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">

    <!-- Spring容器作为父级容器要排除Controller标注的类，控制层的类交给SpringMVC的容器管理 -->
    <context:component-scan base-package="com.lky">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test"/>
        <property name="user" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!-- 配置事务通知 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 扫描Spring容器中标注@Transaction注解的方法或类并加上事务 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!-- mybatis 和 spring进行整合的配置，有了以下的配置mybatis-config.xml就不需要了-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mapperLocations" value="classpath:com/lky/mapper/UserMapper.xml"/>
    </bean>

    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory" />
    </bean>

</beans>

springmvc.xml

<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.lky" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <servlet>
    <servlet-name>DispatcjerServlet</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>DispatcjerServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

构造jsp文件

index.jsp

<%@ page isELIgnored="false" contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
<div class="login">
    <div class="title">XXX管理系统登录页面</div>
    <div class="box">
        <div class="innerBox">
            <form action="/login/dologin" method="post">
                <table>
                    <thead><tr><th colspan="2" >用户登录</th></tr></thead>
                    <tr><td align="right">用户：</td><td>
                        <input type="text" name="username"></td></tr>
                    <tr><td align="right">密码：</td><td>
                        <input type="password" name="password"></td></tr>
                    <tr>
                        <td colspan="2" align="center">
                            <input type="submit" value="登录">
                            <input type="button" value="注册" onclick="register();">
                        </td>
                    </tr>
                </table>
            </form>
            <div class="error" style="padding-left: 25px;color: red">${error}</div>
        </div>
    </div>
</div>
<script type="text/javascript">
    function register() {
        window.location.href="/login/register";
    }
</script>
</body>
</html>

loginsuccess.jsp

<%@ page isELIgnored="false" contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
欢迎${username}回来
</body>
</html>

register.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isErrorPage="false" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<div class="login">
    <div class="title">XXX管理系统注册页面</div>
    <div class="box">
        <div class="innerBox">
            <form action="/login/doRegister" method="post">
                <table>
                    <thead><tr><th colspan="2" >用户注册</th></tr></thead>
                    <tr><td align="right">用户：</td><td><input type="text" name="username"></td></tr>
                    <tr><td align="right">密码：</td><td><input type="password" name="password"></td></tr>
                    <tr>
                        <td colspan="2" align="center">
                            <input type="submit" value="注册">
                        </td>
                    </tr>
                </table>
            </form>
            <div class="error" style="padding-left: 25px;color: red">${error}</div>
        </div>
    </div>
</div>
</body>
</html>

来源：CSDN

作者：JavaEEnswz

链接：https://blog.csdn.net/JavaEEnswz/article/details/103587856