mybatis-generator 有三种用法：命令行、eclipse插件、maven插件。个人觉得maven插件最方便，可以在eclipse/intellij idea等ide上可以通用。

下面是从官网上的截图：(不过官网 www.mybatis.org  最近一段时间,好象已经挂了)

一、在pom.xml中添加plugin

1 < plugin > 2 < groupId > org.mybatis.generator groupId > 3 < artifactId > mybatis-generator-maven-plugin artifactId > 4 < version > 1.3.2 version > 5 < configuration > 6 < configurationFile > src/main/resources/mybatis-generator/generatorConfig.xml configurationFile > 7 < verbose > true verbose > 8 < overwrite > true overwrite > 9 configuration > 10 < executions > 11 < execution > 12 < id > Generate MyBatis Artifacts id > 13 < goals > 14 < goal > generate goal > 15 goals > 16 execution > 17 executions > 18 < dependencies > 19 < dependency > 20 < groupId > org.mybatis.generator groupId > 21 < artifactId > mybatis-generator-core artifactId > 22 < version > 1.3.2 version > 23 dependency > 24 dependencies > 25 plugin >

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其中generatorConfig.xml的位置，大家根据实际情况自行调整

二、generatorConfig.xml配置文件

1 xml version="1.0" encoding="UTF-8" ?> 2 5 6 < generatorConfiguration > 7 < classPathEntry 8 location ="C:/Oracle/Middleware/wlserver_10.3/server/lib/ojdbc6.jar" /> 9 < context id ="my" targetRuntime ="MyBatis3" > 10 < commentGenerator > 11 < property name ="suppressDate" value ="false" /> 12 < property name ="suppressAllComments" value ="true" /> 13 commentGenerator > 14 15 < jdbcConnection driverClass ="oracle.jdbc.driver.OracleDriver" 16 connectionURL ="jdbc:oracle:thin:@172.20.16.***:1521:CARGO" userId ="***" 17 password ="***" /> 18 19 < javaModelGenerator targetPackage ="ctas.test.entity" 20 targetProject ="D:/yangjm/Code/CTAS/JAVAEE/CTAS2CCSP/src/main/java" > 21 < property name ="enableSubPackages" value ="true" /> 22 < property name ="trimStrings" value ="true" /> 23 javaModelGenerator > 24 25 < sqlMapGenerator targetPackage ="ctas.test.entity.xml" 26 targetProject ="D:/yangjm/Code/CTAS/JAVAEE/CTAS2CCSP/src/main/java" > 27 < property name ="enableSubPackages" value ="true" /> 28 sqlMapGenerator > 29 30 < javaClientGenerator targetPackage ="ctas.test.mapper" 31 targetProject ="D:/yangjm/Code/CTAS/JAVAEE/CTAS2CCSP/src/main/java" type ="XMLMAPPER" > 32 < property name ="enableSubPackages" value ="true" /> 33 javaClientGenerator > 34 35 39 40 < table tableName ="CTAS_FEE_BASE" domainObjectName ="FeeBase" 41 enableCountByExample ="false" enableUpdateByExample ="false" 42 enableDeleteByExample ="false" enableSelectByExample ="false" 43 selectByExampleQueryId ="false" > 44 46 table > 47 48 context > 49 generatorConfiguration >

几个要点：

a) 因为生成过程中需要连接db，所以第3行指定了驱动jar包的位置

b) 15-17行为连接字符串

c) 19-33行指定生成“entity实体类、mybatis映射xml文件、mapper接口”的具体位置

d) 40-46行为具体要生成的表，如果有多个表，复制这一段，改下表名即可

三、使用方式

mvn mybatis-generator:generate

如果是在intellij 环境，直接鼠标点击即可

最后给出目录结构图：

最后给一些小技巧：

a) 建表时，字段名称建议用"_"分隔多个单词，比如:AWB_NO、REC_ID...，这样生成的entity，属性名称就会变成漂亮的驼峰命名，即：awbNo、recId

b)oracle中，数值形的字段，如果指定精度，比如Number(12,2)，默认生成entity属性是BigDecimal型 ，如果不指定精度，比如:Number(9)，指默认生成的是Long型

c)oracle中的nvarchar/nvarchar2，mybatis-generator会识别成Object型，建议不要用nvarchar2，改用varchar2