Java Web开发SpringMVC和MyBatis框架开发环境搭建和简单实用

1、下载SpringMVC框架架包，下载地址：
点击下载
点击打开地址如图所示，点击下载即可

然后把相关的jar复制到lib下导入
2、MyBatis（3.4.2）下载
点击下载
MyBatis中文文档地址
点击查看
下载解压之后把jar复制到lib下导入，大概是这样子的

3、jdbc连接库还没有下载。。。这个是5.1.41版本的。。。
点击下载

解压之后这样子。。。
4、fastjson 阿里巴巴的json解析库
点击下载
版本是1.2.24 这个是托管到了github上面的，地址是：点击进入
5、创建WebProject

注意下一步有个选项，如果不勾选，默认是不会生成web.xml的

6、项目创建完毕，把之前的包都弄进来。。
web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>CoolWeb</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>


  <servlet>
      <servlet-name>CoolWeb</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
            <param-name>contextConfigLocation</param-name>
            <!-- <param-value>classpath:application-context.xml</param-value> -->
            <param-value>classpath:CoolWeb-servlet.xml</param-value> 
      </init-param><!-- classpath：只会到你的class路径中查找找文件; 
            classpath*：不仅包含class路径，还包括jar文件中(class路径)进行查找.  -->
      <load-on-startup>1</load-on-startup>
  </servlet>

    <!-- 如果不配置servlet-mapping服务器就无法响应/请求 -->
  <servlet-mapping>
        <servlet-name>CoolWeb</servlet-name>
        <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

7、在src下创建CoolWeb-servlet.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:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        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-4.3.xsd">


    <!-- 开启SpringMVC注解 -->
    <context:component-scan base-package="com.vincent.lwx"/>
    <mvc:annotation-driven/>


</beans>

8、在src下编写ApplicationContext.xml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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        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-4.3.xsd">


    <context:component-scan base-package="com.vincent.lwx"/>
    <mvc:annotation-driven/>

    <!-- User实体类 -->
    <bean id="user" class="com.vincent.lwx.bean.User"/>

     <!-- 支持上传文件 -->  
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"/>
        <!-- max size:10M -->
        <property name="maxUploadSize" value="10485760"/>    
    </bean>  

</beans>

User实体类要在这里注册
9、在src下编写mybatis.xml

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <!-- 配置数据库连接信息 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <!-- 注意3306后面是数据库名称  autoReconnect自动重连-->
                <property name="url" value="jdbc:mysql://localhost:3306/cool?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false&amp;autoReconnect=true" />
                <property name="username" value="root" />
                <property name="password" value="root" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/vincent/lwx/dao/UserMapping.xml" />
    </mappers>

</configuration>

10、log4j.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="debug">
    <appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY" />
            <PatternLayout
                pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n" />
        </Console>
        <RollingFile name="RollingFile" fileName="D:logs/schoolmallapi.log"
            filePattern="log/$${date:yyyy-MM}yimoServiceRun-%d{MM-dd-yyyy}-%i.log.gz">
            <PatternLayout pattern="%d{yyyy-MM-dd ‘at‘ HH:mm:ss z} %-5level %class{36} %L %M - %msg%xEx%n" />
            <SizeBasedTriggeringPolicy size="15MB" />
        </RollingFile>
    </appenders>
    <loggers>
        <root level="DEBUG">
            <appender-ref ref="RollingFile" />
            <appender-ref ref="Console" />
        </root>
    </loggers>

    <!-- 下面是打印 mybatis语句的配置 -->  
    <logger name="com.ibatis" additivity="true">  
        <level value="DEBUG" />  
    </logger>  

    <logger name="java.sql.Connection" additivity="true">  
        <level value="DEBUG" />  
    </logger>  

    <logger name="java.sql.Statement" additivity="true">  
        <level value="DEBUG" />  
    </logger>  

    <logger name="java.sql.PreparedStatement" additivity="true">  
        <level value="DEBUG" />  
    </logger>  

    <logger name="java.sql.ResultSet" additivity="true">  
        <level value="DEBUG" />  
    </logger>  

    <root>  
        <level value="DEBUG" />  
        <appender-ref ref="CONSOLE" />  
<!--         <appender-ref ref="FILE" /> -->  
<!--         <appender-ref ref="framework" /> -->  
    </root>  
</configuration>

这个配置貌似有点问题，虽然不影响使用，不过我也没有去深入研究还，最近还要准备面试Android哎。。。
现在差不多是这样子咯

11、环境搭建差不多了，现在开始撸代码，写一个注册的动能吧
简历一个实体类User.java

package com.vincent.lwx.bean;

import java.io.Serializable;

/**   
* @Title: User.java 
* @Package com.vincent.lwx.bean 
* @Description: TODO(用一句话描述该文件做什么) 
* @author Vincent   
* @date 2017年3月3日 下午6:36:58 
* @version V1.0   
*/
public class User implements Serializable{

    /**
     * 序列化id
     */
    private static final long serialVersionUID = -6375697395831845246L;

    /**
     * 用户id
     */
    private String user_id;

    /**
     * 用户手机号码
     */
    private String phone;

    /**
     * 密码
     */
    private String password;

    /**
     * 用户名
     */
    private String nickname;

    /**
     * 用户头像地址
     */
    private String head;

    /**
     * 性别
     */
    private String sex;

    /**
     * 生日
     */
    private String birthday;

    /**
     * 生活状态(发表的说说)
     */
    private String live_status;

    public String getUser_id() {
        return user_id;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getPassword() {
        return password;
    }

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

    public String getHead() {
        return head;
    }

    public void setHead(String head) {
        this.head = head;
    }



    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public void setUser_id(String user_id) {
        this.user_id = user_id;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String getLive_status() {
        return live_status;
    }

    public void setLive_status(String live_status) {
        this.live_status = live_status;
    }

    public static long getSerialversionuid() {
        return serialVersionUID;
    }

    @Override
    public String toString() {
        return "User [user_id=" + user_id + ", nickname=" + nickname + ", phone=" + phone + ", password=" + password
                + ", head=" + head + ", sex=" + sex + ", birthday=" + birthday + ", live_status=" + live_status
                + "]";
    }


}

编写MyBatis的实体类映射xml文件，就写个UserMapping.xml好了，表示为用户相关的操作

<?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.vincent.lwx.mapping.UserMapping">

    <!-- 根据手机号码查询用户是否存在 -->
    <select id="selectUser" parameterType="String" resultType="com.vincent.lwx.bean.User">
        select * from user where phone = #{phone}
    </select>

</mapper>

我这里只写了一个，别的还没写，注册之前先查询一下手机号码是否已注册。。
注意这里的id 不能重复，要具有唯一性。parameterType是传入的参数类型，这里是String类型的phone，如果要传入多个参数可以使用User对象，或者Map，resultType返回结果类型，我这里是直接返回一个User对象，之前用jdbc直接连接数据库，返回的东西还要手动封装，这个快多了。。。
创建MyBatisUtils.java类，用来从数据库获取SqlSession对象的，SqlSession执行sql语句，和jdbc的Statement对象差不多感觉。。。也可能我的感觉是错的，哈哈，还没看源码。。。

package com.vincent.lwx.db;

import java.io.IOException;
import java.io.Reader;
import java.util.Timer;
import java.util.TimerTask;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.vincent.lwx.util.EatTimerTask;


/**
 * @Title: MyBatisUtils.java
 * @Package com.vincent.julie.config
 * @Description: TODO(????仰?????????????)
 * @author Vincent
 * @date 2017??2??18?? ????12:05:35
 * @version V1.0
 */

public class MyBatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    private static SqlSession sqlSession;
    private static long timeInterval;//上一次运行的时间
    private static  TimerTask task =null;

    static {
        String resource = "mybatis.xml";
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader(resource);
        } catch (IOException e) {
            System.out.println(e.getMessage());

        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    }
    /**
     * 
     * @return
     */
    public static SqlSessionFactory getSqlSessionFactory() {
        return sqlSessionFactory;
    }

    /**
     * ???sqlSession????
     * @return
     */
    public static SqlSession getSqlSession(){
        if (task != null){
             task.cancel();  //将原任务从队列中移除
          }
        task = new EatTimerTask();
        timeInterval = System.currentTimeMillis();
         //间隔??1小时
         long period = 1000 * 60 * 60;    
         //测试时间每分钟一??
         //period = 1000 * 60;        
         Timer timer = new Timer(); 
         timer.schedule(task, timeInterval, period);

        if(sqlSessionFactory == null){
            sqlSessionFactory = MyBatisUtils.getSqlSessionFactory();
        }
        sqlSession = sqlSessionFactory.openSession();
        return sqlSession;
    }


}

这里有个计时器，我发现Tomcat运行一段时间之后（听说是10小时）如果没有连接数据库，会出现异常。。
好，现在来写UserController.java类，处理客户端的请求

package com.vincent.lwx.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.vincent.lwx.bean.ServiceStatus;
import com.vincent.lwx.bean.User;
import com.vincent.lwx.db.MyBatisUtils;
import com.vincent.lwx.util.ResponseUtils;

/**   
* @Title: UserControl.java 
* @Package com.vincent.lwx.mapping 
* @Description: TODO(????仰?????????????) 
* @author Vincent   
* @date 2017??3??3?? ????6:28:37 
* @version V1.0   
*/
@Controller
public class UserController {

    private static final Logger logger = LogManager.getLogger(UserController.class);

    /**
     * 注册
     * @param phone
     * @param password
     * @param request
     * @param response
     */
    @RequestMapping(value = "register", method = RequestMethod.POST)
    public void registerUser(@RequestParam("phone")String phone,@RequestParam("password")String password,HttpServletRequest request,HttpServletResponse response){
        if(hasUserPhone(phone)){
            //用户已存在，无须再次注册
            ResponseUtils.renderJsonDataFail(response, ServiceStatus.RUNTIME_EXCEPTION, "该号码已被注册");
            return;
        }
    }


    /**
     * 根据手机号码查询用户是否存在
     * @param phone
     * @return
     */
    public boolean hasUserPhone(String phone){
        /**sql 语句  完整的包名类名和方法id，*/
        String sql = "com.vincent.lwx.mapping.UserMapping.selectUser";
        SqlSession session = MyBatisUtils.getSqlSession();
        /**返回一个User对象*/
        User user = session.selectOne(sql, phone);
        if(user!=null){
            //用户已存在
            return true;
        }else{
            //用户不存在
            return false;
        }
    }
}

10、最后一步，让Tomcat跑起来，好吧，下载Tomcat、点击下载
这个版本是Tomcat9.0的
Tomcat8.5 点击下载
Tomcat8.5 点击下载
Tomcat7.0 点击下载
如果不会部署的话可以看这里的 部署Tomcat

11、东西写完了不叫最后一步，最后一步应该自己测试一下，google浏览器自带Postman检查一下接口的正确性

因为我的数据库我已经自己注册了，所以提示是正确的，另外附上user表的sql语句：

2017年3月3日18:31:53
CREATE DETABASE cool;
//创建数据库并指定字符编码集
CREATE DATABASE cool DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; 

//创建表
create table user(
user_id int(10) not null primary key auto_increment,
phone varchar(11) not null,
password varchar(16) not null,
nickname varchar(36),
head varchar(50),
sex varchar(3),
birthday varchar(10) default ‘1992-01-01‘,
live_status varchar(255)
)engine = InnoDB default charset=utf8;

//限制最小id=10000
 alter table user AUTO_INCREMENT=10000;设置已经存在的表的默认值
//限制手机号码唯一性
alter table user add unique(phone); 字段值唯一性约束

insert into user(phone,password) values(
‘18696855784‘,
‘555555‘);

CoolWeb源码点击下载
Github地址 进入
2017年3月3日23:52:34