Mybatis Generator的model生成中文注释,支持oracle和mysql(通过修改源码的方式来实现)

在看本篇之前,最好先看一下上一篇通过实现CommentGenerator接口的方法来实现中文注释的例子,因为很多操作和上一篇基本是一致的,所以本篇可能不那么详细.

首先说一下上篇通过实现CommentGenerator接口的一些不足,毕竟只是实现了CommentGenerator接口,在里面的方法再怎么改,有效的也只是针对model类,并且使用的人大概也发现了,里面的addClassComment方法都知道是在类文件上面生成注释,但是无论我们在这个方法实现里写什么都没有效果,其实因为MGB默认是没有调用这个方法的,这个时候如果有需求希望生成的类文件自动加了类文档说明就办不到了,而如果在源代码的基础上修改,就好办多了,想怎么改就怎么改,只要找对地方,什么样的需要都可以自己写代码来实现.

• 首先一样,自己新建一个maven项目,怎么做就不详细说了,前一篇有,都弄好后,修改pom.xml文件,首先引入MBG的源码,在pom.xml中加入依赖

　　　　<dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.</version>
        </dependency>

　　保存过后就会自动下载mybatis-generator-core的jar包,然后我们到自己的本地仓库中去找存放这个jar包的位置,下载下来后pom.xml中这个依赖可以删除了.

我们会看到不仅下载了jar包,源代码也一起下载了,用压缩软件打开source,jar,复制org文件夹及其内所有文件到自己的eclipse建立的maven项目中,这样就取得了MBG的源代码,你也可以在

http://search.maven.org中搜索mybatis-generator-core然后点击source.jar来直接下载源码.

• 第一步得到源代码后之后,复制到项目中我们会发现是报错的,因为有依赖包没有引入,缺少log4j和ant包,在pom.xml中添加上依赖,顺便添加了oracle和mysql的驱动程序包,oracle的本地安装从上一篇中可以看到,加入后项目就没有错误了

　　　　  <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>6.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.9</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.ant</groupId>
            <artifactId>ant</artifactId>
            <version>1.9.0</version>
        </dependency>

这个时候我们的项目结构应该是这个样子的

然后就很简单了,在源代码里找到 org.mybatis.generator.internal.DefaultCommentGenerator类,随便改吧,自己diy,以下是一个样本

/*
 *  Copyright 2008 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.mybatis.generator.internal;

import static org.mybatis.generator.internal.util.StringUtility.isTrue;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.dom.java.CompilationUnit;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.InnerClass;
import org.mybatis.generator.api.dom.java.InnerEnum;
import org.mybatis.generator.api.dom.java.JavaElement;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.config.MergeConstants;
import org.mybatis.generator.config.PropertyRegistry;

/**
 * @author Jeff Butler
 *
 */
public class DefaultCommentGenerator implements CommentGenerator {

    private Properties properties;
    private Properties systemPro;
    private boolean suppressDate;
    private boolean suppressAllComments;
    private String currentDateStr;

    public DefaultCommentGenerator() {
        super();
        properties = new Properties();
        systemPro = System.getProperties();
        suppressDate = false;
        suppressAllComments = false;
        currentDateStr = (new SimpleDateFormat("yyyy-MM-dd")).format(new Date());
    }

    public void addJavaFileComment(CompilationUnit compilationUnit) {
        // add no file level comments by default
        return;
    }

    /**
     * Adds a suitable comment to warn users that the element was generated, and
     * when it was generated.
     */
    public void addComment(XmlElement xmlElement) {
        return;
    }

    public void addRootComment(XmlElement rootElement) {
        // add no document level comments by default
        return;
    }

    public void addConfigurationProperties(Properties properties) {
        this.properties.putAll(properties);

        suppressDate = isTrue(properties.getProperty(PropertyRegistry.COMMENT_GENERATOR_SUPPRESS_DATE));

        suppressAllComments = isTrue(properties.getProperty(PropertyRegistry.COMMENT_GENERATOR_SUPPRESS_ALL_COMMENTS));
    }

    /**
     * This method adds the custom javadoc tag for. You may do nothing if you do
     * not wish to include the Javadoc tag - however, if you do not include the
     * Javadoc tag then the Java merge capability of the eclipse plugin will
     * break.
     *
     * @param javaElement
     *            the java element
     */
    protected void addJavadocTag(JavaElement javaElement, boolean markAsDoNotDelete) {
        javaElement.addJavaDocLine(" *");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(MergeConstants.NEW_ELEMENT_TAG);
        if (markAsDoNotDelete) {
            sb.append(" do_not_delete_during_merge");
        }
        String s = getDateString();
        if (s != null) {
            sb.append(' ');
            sb.append(s);
        }
        javaElement.addJavaDocLine(sb.toString());
    }

    /**
     * This method returns a formated date string to include in the Javadoc tag
     * and XML comments. You may return null if you do not want the date in
     * these documentation elements.
     *
     * @return a string representing the current timestamp, or null
     */
    protected String getDateString() {
        String result = null;
        if (!suppressDate) {
            result = currentDateStr;
        }
        return result;
    }

    public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        innerClass.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        sb.append(" ");
        sb.append(getDateString());
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        innerClass.addJavaDocLine(" */");
    }

    public void addEnumComment(InnerEnum innerEnum, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        innerEnum.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        innerEnum.addJavaDocLine(sb.toString().replace("\n", " "));
        innerEnum.addJavaDocLine(" */");
    }

    public void addFieldComment(Field field, IntrospectedTable introspectedTable,
            IntrospectedColumn introspectedColumn) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        field.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedColumn.getRemarks());
        field.addJavaDocLine(sb.toString().replace("\n", " "));
        field.addJavaDocLine(" */");
    }

    public void addFieldComment(Field field, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        field.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        field.addJavaDocLine(sb.toString().replace("\n", " "));
        field.addJavaDocLine(" */");
    }

    public void addGeneralMethodComment(Method method, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        //      method.addJavaDocLine("/**");
        //      addJavadocTag(method, false);
        //      method.addJavaDocLine(" */");
    }

    public void addGetterComment(Method method, IntrospectedTable introspectedTable,
            IntrospectedColumn introspectedColumn) {
        if (suppressAllComments) {
            return;
        }
        method.addJavaDocLine("/**");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        sb.setLength(0);
        sb.append(" * @return ");
        sb.append(introspectedColumn.getActualColumnName());
        sb.append(" ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        method.addJavaDocLine(" */");
    }

    public void addSetterComment(Method method, IntrospectedTable introspectedTable,
            IntrospectedColumn introspectedColumn) {
        if (suppressAllComments) {
            return;
        }
        method.addJavaDocLine("/**");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        Parameter parm = method.getParameters().get(0);
        sb.setLength(0);
        sb.append(" * @param ");
        sb.append(parm.getName());
        sb.append(" ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        method.addJavaDocLine(" */");
    }

    public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable, boolean markAsDoNotDelete) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        innerClass.addJavaDocLine("/**");
        sb.append(" * 描述:");
        sb.append(introspectedTable.getFullyQualifiedTable()+"表的实体类");
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        sb.setLength(0);
        sb.append(" * @version");
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        sb.setLength(0);
        sb.append(" * @author:  ");
        sb.append(systemPro.getProperty("user.name"));
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        sb.setLength(0);
        sb.append(" * @创建时间: ");
        sb.append(currentDateStr);
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        innerClass.addJavaDocLine(" */");
    }
}

为了是辛辛苦苦写的addClassComment生效,还得找到org.mybatis.generator.codegen.mybatis3.model.BaseRecordGenerator类,在大约60行的地方,在commentGenerator.addJavaFileComment(topLevelClass);后加一句:

 commentGenerator.addClassComment(topLevelClass, introspectedTable,false);

这样自己的方法就调用到了,说明一下,仔细看一下源代码,会发现DefaultCommentGenerator类,会发现addClassComment方法有两个,一个加了boolean markAsDoNotDelete参数,一个没有加,你这里调用的如果不加false参数,就改DefaultCommentGenerator类中两个参数的addClassComment方法,我的样例中你会发现方法中传了参数也不管用,因为真正的源代码中是有这么一行的

然后addJavadocTag方法中是这么调用的

我的样例中addJavadocTag方法的调用都被删除了,所以传个参数也没啥用.

• 其他的如果想有什么改动,就自己去研究源代码,然后自己手动改了,到这里就差不多结束了,剩下的工作和上次的一样,使用mvn clean package命令打成jar包,然后在控制台使用

java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite命令运行,贴一下完整的pom.xml和generatorConfig.xml,部分地方和上次还是有区别的.

pom.xml:

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-generator-coree</artifactId>
    <version>1.3.2</version>
    <packaging>jar</packaging>

    <name>MybatisGenerator</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>6.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.9</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.ant</groupId>
            <artifactId>ant</artifactId>
            <version>1.9.0</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>mybatis-generator-core-1.3.2</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <appendAssemblyId>false</appendAssemblyId>
                    <archive>
                        <manifest>
                            <mainClass>org.mybatis.generator.api.ShellRunner</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>assembly</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

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="context1" targetRuntime="MyBatis3">
        <!-- 指定生成的java文件的编码,没有直接生成到项目时中文可能会乱码 -->
        <property name="javaFileEncoding" value="UTF-8"/>
        <!-- oracle配置 -->
<!--             <jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver"
            connectionURL="jdbc:oracle:thin:@***:1521:orcl" userId="***"
            password="***">
            针对oracle数据库
            <property name="remarksReporting" value="true"></property>
        </jdbcConnection> -->

         <!-- mysql配置 -->
          <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                  connectionURL="jdbc:mysql://localhost:3306/bookshop" userId="root"
                  password="root">
                    <!-- 针对mysql数据库 -->
                    <property name="useInformationSchema" value="true"></property>
          </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- dto class -->
        <javaModelGenerator targetPackage="model"
            targetProject="C:\Users\Administrator\Desktop">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- mybatis xml file -->
        <sqlMapGenerator targetPackage="dao"
            targetProject="C:\Users\Administrator\Desktop">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- mapper class -->
        <javaClientGenerator type="XMLMAPPER"
            targetPackage="dao" targetProject="C:\Users\Administrator\Desktop">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--不生成帮助类（Exmaples） -->
        <!-- enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false"
            enableSelectByExample="false" selectByExampleQueryId="false" -->
        <!--已生成的表 <table schema="demo" tableName="USER" domainObjectName="User"></table> -->
        <table schema="" tableName="bookinfo" domainObjectName="BookInfo"
            enableCountByExample="false" enableUpdateByExample="false"
            enableDeleteByExample="false" enableSelectByExample="false"
            selectByExampleQueryId="false">
        </table>

    </context>
</generatorConfiguration>

这里使用的是默认的就不用指定commentGenerator节点的type属性了.生成后的model效果如下:

生成好的工具下载:

MyGenerator.rar

源码下载:

MyGenerator-source.rar