Java-搭建SSM项目练习

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SSM项目：Spring + SpringMVC + Mybatis~

SSM项目：Spring + SpringMVC + Mybatis

  这是一个SSM项目的搭建基本流程,主要来源于互联网。

第一步：先搭建好数据库：

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CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户ID',
  `email` varchar(255) NOT NULL COMMENT '用户邮箱',
  `password` varchar(255) NOT NULL COMMENT '用户密码',
  `username` varchar(255) NOT NULL COMMENT '用户昵称',
  `role` varchar(255) NOT NULL COMMENT '用户身份',
  `status` int(1) NOT NULL COMMENT '用户状态',
  `regTime` datetime NOT NULL COMMENT '注册时间',
  `regIp` varchar(255) NOT NULL COMMENT '注册IP',
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

第二步、按项目结构图，在IDEA中搭建项目架构：

第三步、配置其中的各个文件，倒序配置，先配置web.xml文件。

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<?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_3_1.xsd"
         version="3.1">

  <display-name>ChatRobot</display-name>
  <description>ChatRobot_Alpha_0.0.1</description>

  <!-- 编码过滤器 -->
  <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>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- 配置DispatcherServlet -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 配置springMVC需要加载的配置文件-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-*.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>

  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- 匹配所有请求，此处也可以配置成 *.do 形式 -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

然后配置spring-mybatis.xml文件

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<?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
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">


    <!-- 配置数据库相关参数properties的属性：${url} -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    
    <!-- 数据库连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>
        <property name="minPoolSize" value="${c3p0.minPoolSize}"/>
        <property name="autoCommitOnClose" value="${c3p0.autoCommitOnClose}"/>
        <property name="checkoutTimeout" value="${c3p0.checkoutTimeout}"/>
        <property name="acquireRetryAttempts" value="${c3p0.acquireRetryAttempts}"/>
    </bean>
    
    <!-- 配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 扫描model包 使用别名 -->
        <property name="typeAliasesPackage" value="com.MySSM.model"/>
        <!-- 扫描sql配置文件:mapper需要的xml文件 -->
        <property name="mapperLocations" value="classpath:mapper/IUserDao.xml"/>
    </bean>
    
    <!-- 配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.MySSM.dao"/>
    </bean>
    
    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
    <!-- 配置基于注解的声明式事务 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

配置spring-mvc.xml文件

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<?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.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

<!-- 扫描web相关的bean -->
<context:component-scan base-package="com.MySSM.*"/>

<!-- 开启SpringMVC注解模式 -->
<mvc:annotation-driven/>

<!-- 静态资源默认servlet配置 -->
<mvc:default-servlet-handler/>

<!-- 配置jsp 显示ViewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/views/"/>
    <property name="suffix" value=".jsp"/>
</bean>

</beans>

配置logback.xml文件

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<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
​    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
​        <encoder>
​            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
​        </encoder>
​    </appender>
​    <root level="debug">
​        <appender-ref ref="STDOUT"/>
​    </root>
</configuration>

配置jdbc.properties文件

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jdbc.driver=com.mysql.jdbc.Driver
#数据库地址
jdbc.url=jdbc:mysql://localhost:3306/myssm #url根据实际情况填写
#用户名
jdbc.username=root
#密码
jdbc.password=12345
#最大连接数
c3p0.maxPoolSize=30
#最小连接数
c3p0.minPoolSize=10
#关闭连接后不自动commit
c3p0.autoCommitOnClose=false
#获取连接超时时间
c3p0.checkoutTimeout=10000
#当获取连接失败重试次数
c3p0.acquireRetryAttempts=2

配置mybatis的映射文件：IUserDao.xml文件

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<?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.MySSM.dao.IUserDao">

<select id="selectUser" resultType="User" parameterType="long">
	SELECT * FROM user WHERE id = #{id}
</select>

</mapper>

IUserService接口代码：

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package com.MySSM.service;

import com.MySSM.model.User;

public interface IUserService {

    public User selectUser(long userId);

}

UserServiceImpl 实现类代码：

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package com.MySSM.service.impl;

import com.MySSM.dao.IUserDao;
import com.MySSM.model.User;
import com.MySSM.service.IUserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service("userService")
public class UserServiceImpl implements IUserService {

    @Resource
    private IUserDao userDao;
    
    public User selectUser(long userId) {
        return this.userDao.selectUser(userId);
    }
}

User 实体类代码：

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package com.MySSM.model;

import java.util.Date;

public class User {

    private long id;
    private String email;
    private String password;
    private String username;
    private String role;
    private int status;
    private Date regTime;
    private String regIp;
    
    public long getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public String getEmail() {
        return email;
    }
    
    public void setEmail(String email) {
        this.email = email;
    }
    
    public String getPassword() {
        return password;
    }
    
    public void setPassword(String password) {
        this.password = password;
    }
    
    public String getUsername() {
        return username;
    }
    
    public void setUsername(String username) {
        this.username = username;
    }
    
    public String getRole() {
        return role;
    }
    
    public void setRole(String role) {
        this.role = role;
    }
    
    public int getStatus() {
        return status;
    }
    
    public void setStatus(int status) {
        this.status = status;
    }
    
    public Date getRegTime() {
        return regTime;
    }
    
    public void setRegTime(Date regTime) {
        this.regTime = regTime;
    }
    
    public String getRegIp() {
        return regIp;
    }
    
    public void setRegIp(String regIp) {
        this.regIp = regIp;
    }

}

IUserDao 接口代码：

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package com.MySSM.dao;

import com.MySSM.model.User;

public interface IUserDao {

    User selectUser(long id);

}

UserController 代码：

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package com.MySSM.controller;

import javax.json.Json;
import javax.servlet.http.HttpServletRequest;

import com.MySSM.model.User;
import com.MySSM.service.IUserService;
import com.alibaba.fastjson.JSON;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@Controller
@RequestMapping("/user")
public class UserController {

    @Resource
    private IUserService userService;
    
    @RequestMapping("/showUser.do")
    public void selectUser(HttpServletRequest request, HttpServletResponse response) throws IOException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        long userId = Long.parseLong(request.getParameter("id"));
        User user = this.userService.selectUser(userId);
        
        PrintWriter out = response.getWriter();
        String jsonString = JSON.toJSONString(user);
    
        if(jsonString != null){
            out.write(jsonString);
        }else{
            out.write("出错了");
        }
        out.close();
    }
}

index.jsp测试页面代码：

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <meta charset="UTF-8">
    <title>test</title>
    <script type="text/javascript" src="js/jquery-1.8.3.js"></script>
    <script>
        $(function () {
                $("#selectUser").click(function () {
                    var id = $("#userId").val();
                    $.ajax({
                        method: "post",
                        url: "user/showUser.do",
                        data: {id: id},
                        dataType: "json",
                        success: function (result) {
                            alert(result.username)
                        }
                    })
                })
            }
        )
    </script>
</head>
<body>
<p id="test">Hello World!</p>
请输入id：<input type="text" id="userId" value="1">
<button type="button" id="selectUser">这是一号</button>
</body>
</html>

基本的搭建情况如图，完成后，将项目部署到Tomcat之后，就可以通过项目的index页面访问到数据库中的数据，并且显示到页面上。点击button按钮，获取数据，并显示。