Intellij Idea下搭建基於Spring+SpringMvc+MyBatis的WebApi接口架構

時間 2019-11-29

標籤 intellij idea 搭建基於 spring+springmvc+mybatis spring springmvc mybatis webapi 接口架構欄目 Eclipse 简体版

原文原文鏈接

2018-08-16 09:27 更新css

強烈推薦使用Springboot來搭建MVC框架！html

強烈推薦使用Springboot來搭建MVC框架！java

強烈推薦使用Springboot來搭建MVC框架！mysql

後文僅供學習參考，可是新項目強烈推薦使用Springboot來搭建MVC框架！git

2018-03-06 22:42github

開發工具：Intellij Idea 2017.3.4（後文統一稱爲idea）web

運行環境：java 九、tomcat 9（經測試在Java7+tomcat7上也能夠，其它自行測試）spring

開發框架：Spring、SpringMvc、Mybatis（後文統一稱爲SSM）sql

包管理工具：Maven數據庫

最終實現：WebApi接口架構、半自動MyBatis生成工具

本項目的GitHub地址：https://github.com/chenyangsocool/ssm.git

爲了讓沒有接觸過idea開發工具的同窗也能順利搭建，本教程儘量詳細。若是有不明白的地方能夠在留言處反饋，我會及時更新文檔。

1、建立基於Maven的SSM項目

1.打開idea，點擊Create New Project，如圖1.1:

圖1.1

2.點擊左側的Maven，勾上Create from archetype，最後在列表中選上maven-archetype-webapp選項後Next，如圖1.2：

（注意別看錯，不是cocoon-22-archetype-webapp）

圖1.2

3.設置GroupId和ArtifactId，其中GroupId能夠認爲是你的Java項目包結構，而ArtifactId認爲是你的項目名稱，如圖1.3:

圖1.3

4.配置你的Maven目錄、Maven配置文件以及jar包存放目錄，如圖1.4：

（配置Maven過程略）

圖1.4

其中，Maven鏡像地址推薦使用阿里鏡像，setting.xml的<mirrors></mirrors>標籤內添加以下內容：

     <mirror>
      <id>alimaven</id>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <mirrorOf>central</mirrorOf>        
    </mirror>

這樣你的jar包下載速度就會炒雞快～

5.填寫項目名稱、Module名稱。這裏我都使用默認。如圖1.5:

圖1.5

6.idea右下角提示處理：

6.1.Maven的包導入，如圖1.6.1:

點擊Import Changes。每次你修改了pom.xml後都會彈出該提示。

6.2.Frameworks，點擊Configure，如圖1.6.2:

會彈出提示：No Frameworks are detected。這裏暫時不用理會。

7.項目的pom.xml文件以下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.chenyangsocool</groupId>
  <artifactId>ssm</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>ssm Maven Webapp</name>
  <url>http://maven.apache.org</url>

  <properties>
    <!-- spring版本號 -->
    <spring.version>4.0.2.RELEASE</spring.version>
    <!-- mybatis版本號 -->
    <mybatis.version>3.2.6</mybatis.version>
    <!-- log4j日誌文件管理包版本 -->
    <slf4j.version>1.7.7</slf4j.version>
    <log4j.version>1.2.16</log4j.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <!-- 表示開發的時候引入，發佈的時候不會加載此包 -->
      <scope>test</scope>
    </dependency>
    <!-- spring核心包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-oxm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!-- mybatis核心包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!-- mybatis/spring包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- 導入java ee jar 包 -->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>7.0</version>
    </dependency>
    <!-- 導入Mysql數據庫連接jar包 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.30</version>
    </dependency>
    <!-- 導入dbcp的jar包，用來在applicationContext.xml中配置數據庫 -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- JSTL標籤類 -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- 日誌文件管理包 -->
    <!-- log start -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>
    <!-- 格式化對象，方便輸出日誌 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.1.41</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <!-- log end -->
    <!-- 映入JSON -->
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>1.9.13</version>
    </dependency>
    <!-- 上傳組件包 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!-- mybatis-generator -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.6</version>
    </dependency>
    <!-- commons-io -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.6</version>
    </dependency>
    <!-- commons-codec -->
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.11</version>
    </dependency>
    <!-- commons-lang3 -->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.7</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>ssm</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

8.進行Spring、SpringMvc和MyBatis的整合:

8.1.先給出個人整合後的項目結構，如圖1.8.1:

圖1.8.1

8.2.在resouces下新建jdbc.properties數據庫鏈接屬性文件：

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=utf-8
username=root
password=root
#定義初始鏈接數
initialSize=0
#定義最大鏈接數
maxActive=20
#定義最大空閒
maxIdle=20
#定義最小空閒
minIdle=1
#定義最長等待時間
maxWait=60000

8.3.在resouces下新建log4j.properties日誌記錄文件：

#定義LOG輸出級別
log4j.rootLogger=INFO,Console,File
#定義日誌輸出目的地爲控制檯
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#能夠靈活地指定日誌輸出格式，下面一行是指定具體的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n

#文件大小到達指定尺寸的時候產生一個新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定輸出目錄
log4j.appender.File.File = logs/springmvcMybatis/ssm.log
#定義文件最大大小
log4j.appender.File.MaxFileSize = 10MB
#輸出因此日誌，若是換成DEBUG表示輸出DEBUG以上級別日誌
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n

8.5.建立以下文件：

在main目錄下建立名爲java的package，建立完成後右鍵該package》Mark Directory as 》Sources Root；

在java目錄下建立包com.chenyangsocool.ssm，再接着建立controller、dao、model、service包目錄；

在resources下建立mapping文件夾，如圖1.8.5：

圖1.8.5

8.4.在resouces下新建Spring與Mybatis整合所需的文件，spring-mybatis.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:p="http://www.springframework.org/schema/p"
       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-3.1.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <!-- 自動掃描 -->
    <context:component-scan base-package="com.chenyangsocool.ssm" />
    <!-- 引入配置文件 -->
    <bean id="propertyConfigurer"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <!-- 初始化鏈接大小 -->
        <property name="initialSize" value="${initialSize}"></property>
        <!-- 鏈接池最大數量 -->
        <property name="maxActive" value="${maxActive}"></property>
        <!-- 鏈接池最大空閒 -->
        <property name="maxIdle" value="${maxIdle}"></property>
        <!-- 鏈接池最小空閒 -->
        <property name="minIdle" value="${minIdle}"></property>
        <!-- 獲取鏈接最大等待時間 -->
        <property name="maxWait" value="${maxWait}"></property>
    </bean>

    <!-- spring和MyBatis完美整合，不須要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自動掃描mapping.xml文件 -->
        <property name="mapperLocations" value="classpath:mapping/*.xml"></property>
    </bean>

    <!-- DAO接口所在包名，Spring會自動查找其下的類 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.chenyangsocool.ssm.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>

    <!-- (事務管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

</beans>

此時，<property name="mapperLocations" value="classpath:mapping/*.xml"></property>中，*.xml是報錯的紅色狀態，別擔憂，一會在裏面放入xml格式的mapping文件後錯誤就會消失。

8.5.在resouces下新建spring-mvc.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:p="http://www.springframework.org/schema/p"
       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-4.0.xsd
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context-4.0.xsd
                            http://www.springframework.org/schema/mvc
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!--避免IE執行AJAX時，返回JSON出現下載文件 -->
    <bean id="mappingJacksonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>

    <!-- 啓動SpringMVC的註解功能，完成請求和註解model的映射 -->
    <bean
            class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="mappingJacksonHttpMessageConverter" />    <!-- JSON轉換器 -->
            </list>
        </property>
    </bean>

    <!-- 對靜態資源的訪問 -->
    <!-- <mvc:resources mapping="/js/**" location="/js/" />
    <mvc:resources mapping="/css/**"  location="/css/" /> -->

    <!-- 自動掃描該包，使SpringMVC認爲包下用了@controller註解的類是控制器 -->
    <context:component-scan base-package="com.chenyangsocool.ssm.controller" />

    <!-- 添加註解驅動 -->

    <mvc:annotation-driven enable-matrix-variables="true" />
    <!-- 容許對靜態資源文件的訪問 -->

    <mvc:default-servlet-handler />

    <!-- 定義跳轉的文件的先後綴 ，視圖模式配置 -->
    <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 這裏的配置個人理解是自動給後面action的方法return的字符串加上前綴和後綴，變成一個 可用的url地址 -->
        <property name="prefix" value="/WEB-INF/view/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 配置文件上傳，若是沒有使用文件上傳能夠不用配置，固然若是不配，那麼配置文件中也沒必要引入上傳組件包 -->
    <bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 默認編碼 -->
        <property name="defaultEncoding" value="UTF-8" />
        <!-- 文件大小最大值 -->
        <property name="maxUploadSize" value="10485760000" />
        <!-- 內存中的最大值 -->
        <property name="maxInMemorySize" value="40960" />
    </bean>
</beans>

8.6.配置web.xml文件：

<?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_3_0.xsd"
         version="3.0">
  <display-name>Archetype Created Web Application</display-name>

  <!-- Spring和mybatis的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-mybatis.xml</param-value>
  </context-param>

  <!-- 編碼過濾器 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <async-supported>true</async-supported>
    <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>

  <!-- Spring監聽器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- 防止Spring內存溢出監聽器 -->
  <listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
  </listener>

  <!-- Spring MVC servlet -->
  <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:spring-mvc.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>
    <!-- 此處能夠能夠配置成*.do，對應struts的後綴習慣 -->
    <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>

至此，基於SSM的Maven項目搭建完畢～

2、測試SSM框架

先放上該大步驟完成後的結構圖，如圖2：

圖2

1.建立數據庫：

DROP TABLE IF EXISTS `test`;
CREATE TABLE test
(
    id INT PRIMARY KEY NOT NULL COMMENT 'id' AUTO_INCREMENT,
    context NVARCHAR(50) NOT NULL COMMENT '內容',
    view_count INT DEFAULT 0 NOT NULL COMMENT '瀏覽次數'
);
ALTER TABLE test COMMENT = '測試';
insert  into `test`(`context`,`view_count`) values ('測試內容：xfjmjj',10086);

2.在view文件夾下建立test/index.jsp文件，如圖2.2:

圖2.2

3.test/index.jsp內容:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>index</title>
</head>
<body>
<h2>test's index</h2>
<br/>
${test.id}<br/>
${test.context}<br/>
${test.viewCount}
</body>
</html>

4.添加resources/mapping/TestMapper.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.chenyangsocool.ssm.dao.TestDao" >
    <resultMap id="BaseResultMap" type="com.chenyangsocool.ssm.model.Test" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="context" property="context" jdbcType="VARCHAR" />
        <result column="view_count" property="viewCount" jdbcType="INTEGER" />
    </resultMap>
    <sql id="Base_Column_List" >
        id, context, view_count
    </sql>
    <select id="getModelById" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
        select
        <include refid="Base_Column_List" />
        from test
        where id = #{id,jdbcType=INTEGER}
    </select>
</mapper>

5.添加service/ITestService.java:

package com.chenyangsocool.ssm.service;

import com.chenyangsocool.ssm.model.Test;

public interface ITestService {
    public Test getModelById(int id);
}

6.添加service/impl/TestServiceImpl.java:

package com.chenyangsocool.ssm.service.impl;

import com.chenyangsocool.ssm.dao.TestDao;
import com.chenyangsocool.ssm.model.Test;
import com.chenyangsocool.ssm.service.ITestService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class TestServiceImpl implements ITestService {
    @Resource
    private TestDao testDao;

    @Override
    public Test getModelById(int id) {
        return testDao.getModelById(id);
    }
}

7.添加controller/TestController.java:

package com.chenyangsocool.ssm.controller;

import com.chenyangsocool.ssm.model.Test;
import com.chenyangsocool.ssm.service.ITestService;
import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

@Controller
@RequestMapping("/test")
public class TestController {

    @Resource
    private ITestService testService;

    @RequestMapping("/index_page")
    public String showIndex(HttpServletRequest request, Model model) {
        int id = Integer.parseInt(request.getParameter("id"));
        Test test = this.testService.getModelById(id);
        //綁定對象到test/index.jsp
        model.addAttribute("test", test);
        return "test/index";
    }

    @RequestMapping("/index_api")
    @ResponseBody
    public Test Index(HttpServletRequest request,Model model) {
        int id = Integer.parseInt(request.getParameter("id"));
        return this.testService.getModelById(id);
    }
}

3、配置Tomcat

（安裝Tomcat過程略）

1.工具欄中Run 》Edit Configurations 》左上角+號》Tomcat Server 》Local，而後點擊右下角的Fix按鈕，在彈出框中選擇ssm:war exploded，如圖3.1：

圖3.1

2.在彈出的窗口中進行設置，將Name能夠設置爲testTomcat（不改也行），將Application context手動填入/ssm如圖3.2:

3.切換到標籤頁，按圖3.3中設置：

圖3.3

至此，基於SSM框架的WebApi接口項目搭建完成，點擊idea右上角的綠色三角形▶️運行項目：

輸入http://localhost:8080/ssm/test/index_page?id=1，能夠看到網頁；

輸入http://localhost:8080/ssm/test/index_api?id=1，能夠看到json接口。

4、集成Mybatis-generator

1.添加測試數據庫:

DROP TABLE IF EXISTS `user`;
CREATE TABLE user
(
    id INT PRIMARY KEY NOT NULL COMMENT 'id' AUTO_INCREMENT,
    context NVARCHAR(50) NOT NULL COMMENT '內容',
    view_count INT DEFAULT 0 NOT NULL COMMENT '瀏覽次數'
);
ALTER TABLE user COMMENT = '測試';
insert  into `user`(`context`,`view_count`) values ('測試內容：xfjmjj',10086);

2.添加com.chenyangsocool.ssm.tools.mybatis/RemarksCommentGenerator.java，該文件自定義了生成的文件的註釋，會將數據庫中的註釋轉換成實體類中的註釋：

package com.chenyangsocool.ssm.tools.mybatis;

import java.util.Date;

import org.apache.commons.lang3.time.DateFormatUtils;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.JavaElement;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.config.MergeConstants;
import org.mybatis.generator.internal.DefaultCommentGenerator;
import org.mybatis.generator.internal.util.StringUtility;

/**
 * 官方相似的功能見，在版本1.3.3中添加的 addRemarkComments <br>
 * http://www.mybatis.org/generator/configreference/commentGenerator.html <br>
 * https://github.com/mybatis/generator/issues/23
 *
 * @see DefaultCommentGenerator#addRemarkComments
 */
public class RemarksCommentGenerator extends DefaultCommentGenerator {

    @Override
    public void addModelClassComment(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
        topLevelClass.addJavaDocLine("/**");

        String remarks = introspectedTable.getRemarks();
        if (StringUtility.stringHasValue(remarks)) {
            String[] remarkLines = remarks.split(System.getProperty("line.separator"));
            for (String remarkLine : remarkLines) {
                topLevelClass.addJavaDocLine(" * " + remarkLine);
            }
        }

        topLevelClass.addJavaDocLine(" * ");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        topLevelClass.addJavaDocLine(sb.toString());
        topLevelClass.addJavaDocLine(" *");
        addJavadocTag(topLevelClass, false);
        topLevelClass.addJavaDocLine(" */");
    }

    public void addFieldComment(Field field, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
        field.addJavaDocLine("/**");

        String remarks = introspectedColumn.getRemarks();
        if (StringUtility.stringHasValue(remarks)) {
            String[] remarkLines = remarks.split(System.getProperty("line.separator"));
            for (String remarkLine : remarkLines) {
                field.addJavaDocLine(" * " + remarkLine);
            }
        }

        field.addJavaDocLine(" *");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        sb.append('.');
        sb.append(introspectedColumn.getActualColumnName());
        field.addJavaDocLine(sb.toString());
        field.addJavaDocLine(" *");
        addJavadocTag(field, false);
        field.addJavaDocLine(" */");
    }

    public void addFieldComment(Field field, IntrospectedTable introspectedTable) {
        field.addJavaDocLine("/**");
        addJavadocTag(field, false);
        field.addJavaDocLine(" */");
    }

    public void addGetterComment(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
        method.addJavaDocLine("/**");
        addJavadocTag(method, false);
        method.addJavaDocLine(" */");
    }

    public void addSetterComment(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
        method.addJavaDocLine("/**");
        addJavadocTag(method, false);
        method.addJavaDocLine(" */");
    }

    protected void addJavadocTag(JavaElement javaElement, boolean markAsDoNotDelete) {
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(MergeConstants.NEW_ELEMENT_TAG);
        if (markAsDoNotDelete) {
            sb.append(" do_not_delete_during_merge"); //$NON-NLS-1$
        }
        String s = getDateString();
        if (s != null) {
            sb.append(' ');
            sb.append(s);
        }
        javaElement.addJavaDocLine(sb.toString());
    }

    protected String getDateString() {
        return DateFormatUtils.format(new Date(), "yyyy-MM-dd HH:mm:ss");
    }
}

3.添加resources/generatorConfig.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
    <context id="context">
        <!-- 是否生成註釋 -->
        <commentGenerator type="com.chenyangsocool.ssm.tools.mybatis.RemarksCommentGenerator">
        </commentGenerator>
        <!-- 數據庫鏈接 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://chenyangsocool.tpddns.cn:3306/ssm"
                        userId="young" password="young" />

        <!-- 生成的包名和工程名 -->
        <javaModelGenerator targetPackage="com.chenyangsocool.ssm.model"
                            targetProject="src/main/java"/>
        <sqlMapGenerator targetPackage="mapping"
                         targetProject="src/main/resources" />
        <javaClientGenerator targetPackage="com.chenyangsocool.ssm.dao"
                             targetProject="src/main/java" type="XMLMAPPER" />

        <!-- 數據庫表 -->
        <table  tableName="user" domainObjectName="User">
            <!-- 設置別名 -->
            <!--
            <columnOverride column="login_pwd" property="loginPwd" />
             -->
        </table>
    </context>
</generatorConfiguration>

4.添加com.chenyangsocool.ssm.tools.mybatis/MyBatisGen.java:

package com.chenyangsocool.ssm.tools.mybatis;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

/**
 *  使用Java運行 MyBatis Generator
 */
public class MyBatisGen {

    public static void main(String[] args) throws Exception {
        File file=new File("");
        String abspath=file.getAbsolutePath()+"/src/main/resources/generatorConfig.xml";
        File configFile = new File(abspath);
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }
}