首页 > 代码库 > 通过实现CommentGenerator接口的方法来实现Mybatis Generator的model生成中文注释
通过实现CommentGenerator接口的方法来实现Mybatis Generator的model生成中文注释
自己手动实现的前提,对maven项目有基本的了解,在本地成功搭建了maven环境,可以参考我之前的文章:maven环境搭建
项目里新建表时model,mapper以及mapper.xml基本都是用Mybatis Generator(以下简称为MBG)自动生成的,但是MBG自动生成的model的注释实在有点非人类,至少中国人是完全接受不了的,在配置中禁用掉注释吧,倒是简单了,可是生成的model类光秃秃的,啥都没有,字段方法没有注释,使用很不方便,别人看也不知道这个字段是啥含义,到最后还是要自己添加,一张表多点几十个字段,特么添加累死了,不能这么干,得想法子,百度了一下网上,基本有两种方法,第一种,就是直接修改MGB的源代码,第二种就是自己写一个类实现CommentGenerator接口,先说自己写一个新类实现CommentGenerator接口的方法来使自动生成的model类含有中文注释吧.
- 1.首先新建一个maven项目,请选择一个简单的maven项目:或者在选择的时候直接选择create a simple project.
- 2,右键项目->build path->config build path...->Libraries,修改jdk为你工作空间的默认jdk,然后右键项目->new->source folder,输入src/main/resources,建好resources目录,如果已经建好就直接跳过.
- 3 因为是要写一个类实现CommentGenerator接口,所以先在项目中引入mybatis-generator-core的jar包 在pom.xml中添加依赖, 这里统一使用1.3.2版本.为了不用每次使用都要使用者自己指定ojdbc6.jar位置,直接将其引入到项目中,这里要使用该引入,需要先将jar包安装到本地maven仓库中,否则这里这样引入会报错的,怎么安装可以参考这篇文章:
maven手动安装jar包到本地仓库,以ojdbc6为例,
同时为了支持mysql,也一起加入mysql的驱动包,mysql的驱动包不用手动安装,直接引入就会自动下载的
<dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.2</version> </dependency>
<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>
- 4 在源代码中新建一个类MyCommentGenerator,实现CommentGenerator接口,类的代码如下:
package org.mybatis.generator; 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; /** * 描述: * @since 1.9.10 * @version 1.9.10 * @作者:niexiaohui * @创建时间:2016年11月22日 * @修改记录: */ public class MyCommentGenerator implements CommentGenerator{ private Properties properties; private Properties systemPro; private boolean suppressDate; private boolean suppressAllComments; private String currentDateStr; public MyCommentGenerator() { 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(" * "); sb.append(introspectedTable.getFullyQualifiedTable()); innerClass.addJavaDocLine(sb.toString().replace("\n", " ")); sb.setLength(0); sb.append(" * @author "); sb.append(systemPro.getProperty("user.name")); sb.append(" "); sb.append(currentDateStr); innerClass.addJavaDocLine(" */"); } }
- 5.再新建一个类StartUp,用于运行项目,类的代码如下:
package org.mybatis.generator; import java.io.IOException; import java.io.InputStream; import java.net.URISyntaxException; import java.sql.SQLException; 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.exception.InvalidConfigurationException; import org.mybatis.generator.exception.XMLParserException; import org.mybatis.generator.internal.DefaultShellCallback; /** * 描述: * @since 1.9.10 * @version 1.9.10 * @作者:niexiaohui * @创建时间:2016年11月22日 * @修改记录: */ public class StartUp { public static void main(String[] args) throws URISyntaxException { try { List<String> warnings = new ArrayList<String>(); boolean overwrite = true; ClassLoader classloader = Thread.currentThread().getContextClassLoader(); InputStream is = classloader.getResourceAsStream("generatorConfig.xml"); ConfigurationParser cp = new ConfigurationParser(warnings); Configuration config = cp.parseConfiguration(is); DefaultShellCallback callback = new DefaultShellCallback(overwrite); MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings); myBatisGenerator.generate(null); } catch (SQLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } catch (InvalidConfigurationException e) { e.printStackTrace(); } catch (XMLParserException e) { e.printStackTrace(); } } }
- 6. 然后将generatorConfig.xml放入resources目录下,generatorConfig.xml内容如下
<?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> <!-- ojdbc6.jar已经直接放到项目中,无需指定了,同时mysql驱动包也一样,这里同样无需指定 --> <!-- <classPathEntry location="ojdbc6.jar" /> --> <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"/> <!-- 这里的type里写的是你的实现类的类全路径 --> <commentGenerator type="org.mybatis.generator.MyCommentGenerator"> </commentGenerator> <jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver" connectionURL="jdbc:oracle:thin:@远程ip地址或localhost:1521:orcl" userId="用户名" password="密码"> <!-- 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="http://www.mamicode.com/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="ABS_DEAL" domainObjectName="AbsDeal" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"> </table> </context> </generatorConfiguration>
到此为止项目的结构如下:
这个时候我们运行StartUp的main方法,已经可以实现了,发现桌面上生成了两个文件夹,model和mapper文件夹,里面有生成的文件.看一下效果:
是不是很符合中国人的审美观呢,如果不满意,或者有什么要加的,可以自己在实现类中加入代码修改,addFieldComment,addGetterComment,addSetterComment这几个方法就行了,里面的代码也很容易看懂,很容易改.
- 6.到此为止虽然已经生成成功了,但是事情还不算完,不能要求每个人都从无到有搞这么一个项目,所以要把它打成一个可以运行的jar包才行.这里要使依赖包被打包到最后的jar包中,要在pom.xml中进行相应的配置,这里给出全部的pom.xml的代码:
<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>mygenerator</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>mygenerator</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc6</artifactId> <version>6.0</version> </dependency> </dependencies> <build> <!-- 这里指定最终生成的jar包的名字,为了盗版到底,直接使用原先的名称,嘿嘿 --> <finalName>mybatis-generator-core-1.3.2</finalName> <plugins> <plugin> <!-- 因为项目中使用了依赖包,所以要使用maven-assembly-plugin来构建,会把依赖包同时打进jar包中 --> <artifactId>maven-assembly-plugin</artifactId> <version>2.6</version> <configuration> <!-- 这里不指定为false打包会生成两个jar包,我们要用的那个jar包命名很乱,后面加了 jar-with-dependencies,不喜欢,直接禁用掉 --> <appendAssemblyId>false</appendAssemblyId> <archive> <manifest> <!-- 指定main方法的类的全路径 否则运行会报找不到main class的错误--> <mainClass>org.mybatis.generator.StartUp</mainClass> </manifest> </archive> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> <executions> <execution> <id>make-assembly</id> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
到这里项目就完成了,在项目根路径使用打包命令mvn clean package,当然可以在eclipse中使用maven build中输入命令来生成,我习惯使用控制台来生成,在项目根路径,按住shift的同时右键,选择在此处打开命令窗口,然后输入mvn clean package命令按下enter,当然这些可以实现的前提是你本地maven环境配置好了,如果没有设置maven_home环境变量的话运行会提示无法识别的mvn命令的,成功构建后显示build success,到target目录下,看到生成了jar包:
同样在target目录下:按住shift同时右键->在此处打开命令行,输入java -jar mybatis-generator-core-1.3.2.jar命令运行jar包,注意-jar后打出my时按tab键mybatis-generator-core-1.3.2.jar就自动补全了,运行结束后,同样的在桌面上回看到生成的model和mapper文件夹及里面的文件.这里是测试,所以配置中写文件生成在了桌面上,可以改一下配置,设置在项目中输出,直接输出到项目中.
当然为了使用方便,不用每次都输入java -jar mybatis-generator-core-1.3.2.jar命令,可以把命令放入脚本文件中,新建一个记事本,重命名为generator.bat,然后把java -jar mybatis-generator-core-1.3.2.jar命令拷贝进去,以后只要双击generator.bat就可以直接生成了,当然你的generator.bat得和jar包在同一个目录下.
还有要修改generatorConfig.xml文件可以使用压缩软件打开mybatis-generator-core-1.3.2.jar,双击generatorConfig.xml,修改后保存并更新回压缩包.因为这里StartUp文件中使用的是加载generatorConfig.xml的方法,所以会加载jar包里的generatorConfig.xml配置文件,如果StartUp文件中加载配置文件的方式使用MBG原生态的加载方式,就可以使用jar包同目录下的generatorConfig.xml,不过那时运行命令就为:java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite,我觉得这样挺好的,不用每次都拖着一个generatorConfig.xml,移动都不方便,放在jar包里跟着跑挺方便的.
通过实现CommentGenerator接口的方法来实现Mybatis Generator的model生成中文注释