基于Java形式的Mybatis逆向工程(无配置文件，生成注释)

快来打我* 2022-06-06 09:18 86阅读 0赞

基于最新的Mybatis Generator版本

<dependency>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-core</artifactId>
                <version>1.3.5</version>
      </dependency>

使用Run Main方法的形式执行逆向工程，生成Java Model, Java Mapper,SQL Mapper。  
同时对Model内属性添加注释，Mapper接口方法添加注释。

模块分为四个Java Class,

第一个是接口配置，替换原来的配置文件，同时固化可配置的选项，比配置文件形式简单明了。

package com.bob.config.root.mybatis.generate;
    
    import java.util.Arrays;
    import java.util.List;
    
    import org.mybatis.generator.api.JavaTypeResolver;
    
    /** * Mybatis逆向工程配置 * * @author * @create 2017-09-30 9:19 */
    public interface MybatisGenerateConfigs { 
    
        //是否用逆向工程生成的Model,Dao,Mapper覆盖当前已存在的,若覆盖请做好备份工作
        Boolean OVERRIDE_EXIST = false;
    
        //指定要生成的Table
        List<String> TABLES = Arrays.asList("emp_country", "emp_region");
    
        //连接数据库驱动包 这里选择自己本地位置
        //String CLASSPATH_ENTRY = "D:/profile/mysql-connector-java-5.1.44-bin.jar";
        String CLASSPATH_ENTRY = "D:/profile/postgresql-42.1.4.jar";
    
        //指定生成java文件的编码格式
        String JAVA_FILEEN_CODING = "UTF-8";
    
        //指定JDBC信息
        String JDBC_DRIVERCLASS = "com.mysql.jdbc.Driver";
        String JDBC_CONNECTIONURL = "jdbc:mysql://localhost:3306/project";
        String JDBC_USER_NAME = "root";
        String JDBC_PASSWORD = "lanboal";
    
        //如果maven工程只是单独的一个工程，targetProject="src/main/resources"
        //String DEFAULT_JAVA_TARGETPROJECT = "src/main/java";
        //String DEFAULT_RESOURCES_TARGETPROJECT = "src/main/resources";
    
        //若果maven工程是分模块的工程，即使时在当前模块下生产成Mybatis文件，也需要指定模块前缀，
        // targetProject="指定模块的名称/路径"，例如：targetProject="project-web/src/main/java"
        String DEFAULT_JAVA_TARGETPROJECT = "project-web/src/main/java";
        //java类和配置文件生成位置可以指向不同的项目
        String DEFAULT_RESOURCES_TARGETPROJECT = "project-root/src/main/resources";
    
        //指定Java Model生成位置
        String JAVA_MODEL_TARGETPROJECT = DEFAULT_JAVA_TARGETPROJECT;
        String JAVA_MODEL_TARGETPACKAGE = "com.bob.mvc.model";
        //指定Java DAO接口生成位置
        String JAVACLIENT_TARGETPROJECT = DEFAULT_JAVA_TARGETPROJECT;
        String JAVACLIENT_TARGETPACKAGE = "com.bob.mvc.mapper";
        //指定Mapper.xml生成位置
        String SQLMAP_TARGETPROJECT = DEFAULT_RESOURCES_TARGETPROJECT;
        String SQLMAP_TARGETPACKAGE = "com.bob.mvc.mapper";
    
        /** * 可设置自定义的类型解析器 * {@linkplain JavaTypeResolver} */
        String JAVA_TYPE_RESOLVER = null;
    
    }

第二个类是配置文件的Parser:

import java.util.ArrayList;
    import java.util.List;
    
    import org.mybatis.generator.config.CommentGeneratorConfiguration;
    import org.mybatis.generator.config.Configuration;
    import org.mybatis.generator.config.Context;
    import org.mybatis.generator.config.JDBCConnectionConfiguration;
    import org.mybatis.generator.config.JavaClientGeneratorConfiguration;
    import org.mybatis.generator.config.JavaModelGeneratorConfiguration;
    import org.mybatis.generator.config.JavaTypeResolverConfiguration;
    import org.mybatis.generator.config.SqlMapGeneratorConfiguration;
    import org.mybatis.generator.config.TableConfiguration;
    
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVA_TYPE_RESOLVER;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.CLASSPATH_ENTRY;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVACLIENT_TARGETPACKAGE;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVACLIENT_TARGETPROJECT;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVA_FILEEN_CODING;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVA_MODEL_TARGETPACKAGE;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVA_MODEL_TARGETPROJECT;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JDBC_CONNECTIONURL;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JDBC_DRIVERCLASS;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JDBC_PASSWORD;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JDBC_USER_NAME;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.SQLMAP_TARGETPACKAGE;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.SQLMAP_TARGETPROJECT;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.TABLES;
    
    /** * Mybatis逆向工程基于Java形式的配置解析器 * * @author * @create 2017-09-30 9:17 */
    public class MybatisGeneratorConfiguration {
    
        public Configuration configMybatisGenerator() {
            Configuration configuration = new Configuration();
    
            configuration.addClasspathEntry(CLASSPATH_ENTRY);
    
            Context context = new Context(null);
            context.setTargetRuntime("MyBatis3");
            context.setId("bob");
    
            context.addProperty("javaFileEncoding", JAVA_FILEEN_CODING);
    
            //设置注解生成器
            context.setCommentGeneratorConfiguration(generateCommentConfiguration());
            //设置JDBC连接配置
            context.setJdbcConnectionConfiguration(generateJDBCConnectionConfiguration());
            //设置JDBC Type 与Java Type之间的映射解析器
            context.setJavaTypeResolverConfiguration(generateJavaTypeResolverConfiguration());
            //设置Java Model生成配置
            context.setJavaModelGeneratorConfiguration(generateJavaModelGeneratorConfiguration());
            //设置DAO层的生成配置
            context.setSqlMapGeneratorConfiguration(generateSqlMapGeneratorConfiguration());
            //设置Mapper.xml生成
            context.setJavaClientGeneratorConfiguration(generateJavaClientGeneratorConfiguration());
            //设置需要生成的Table及生成形式
            for (TableConfiguration tableConfiguration : generateTableConfigurations(context)) {
                context.addTableConfiguration(tableConfiguration);
            }
            configuration.addContext(context);
            return configuration;
        }
    
        /** * 配置注解生成器 * * @return */
        private CommentGeneratorConfiguration generateCommentConfiguration() {
            CommentGeneratorConfiguration configuration = new CommentGeneratorConfiguration();
            configuration.setConfigurationType(GeneralCommentGenerator.class.getName());
            //是否去除自动生成的注释 true：是 ： false:否
            configuration.addProperty("suppressAllComments", "false");
            configuration.addProperty("addRemarkComments", "true");
            return configuration;
        }
    
        /** * 设置数据库连接的信息：驱动类、连接地址、用户名、密码 * * @return */
        private JDBCConnectionConfiguration generateJDBCConnectionConfiguration() {
            JDBCConnectionConfiguration configuration = new JDBCConnectionConfiguration();
            configuration.setDriverClass(JDBC_DRIVERCLASS);
            String jdbcSuffix = "?useUnicode=true&characterEncoding=UTF8&useSSL=false";
            configuration.setConnectionURL(JDBC_CONNECTIONURL + jdbcSuffix);
            configuration.setUserId(JDBC_USER_NAME);
            configuration.setPassword(JDBC_PASSWORD);
            return configuration;
        }
    
        /** * 设置JDBC Type 与Java Type之间的映射解析器 * * @return */
        private JavaTypeResolverConfiguration generateJavaTypeResolverConfiguration() {
            JavaTypeResolverConfiguration configuration = new JavaTypeResolverConfiguration();
            //可自定义类型映射解析器
            configuration.setConfigurationType(JAVA_TYPE_RESOLVER);
            //默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和 NUMERIC 类型解析为java.math.BigDecimal
            configuration.addProperty("forceBigDecimals", "true");
            return configuration;
        }
    
        /** * 配置Java Model生成 * * @return */
        private JavaModelGeneratorConfiguration generateJavaModelGeneratorConfiguration() {
            JavaModelGeneratorConfiguration configuration = new JavaModelGeneratorConfiguration();
            configuration.setTargetProject(JAVA_MODEL_TARGETPROJECT);
            configuration.setTargetPackage(JAVA_MODEL_TARGETPACKAGE);
            //是否让schema作为包的后缀
            configuration.addProperty("enableSubPackages", "false");
            //从数据库返回的值被清理前后的空格
            configuration.addProperty("trimStrings", "true");
            return configuration;
        }
    
        /** * 配置Mapper.xml生成 * * @return */
        private SqlMapGeneratorConfiguration generateSqlMapGeneratorConfiguration() {
            SqlMapGeneratorConfiguration configuration = new SqlMapGeneratorConfiguration();
            configuration.setTargetProject(SQLMAP_TARGETPROJECT);
            configuration.setTargetPackage(SQLMAP_TARGETPACKAGE);
            //是否让schema作为包的后缀
            configuration.addProperty("enableSubPackages", "false");
            return configuration;
        }
    
        /** * 设置DAO生成 * * @return */
        private JavaClientGeneratorConfiguration generateJavaClientGeneratorConfiguration() {
            JavaClientGeneratorConfiguration configuration = new JavaClientGeneratorConfiguration();
            configuration.setConfigurationType("XMLMAPPER");
            configuration.setTargetProject(JAVACLIENT_TARGETPROJECT);
            configuration.setTargetPackage(JAVACLIENT_TARGETPACKAGE);
            //是否让schema作为包的后缀
            configuration.addProperty("enableSubPackages", "false");
            return configuration;
        }
    
        private List<TableConfiguration> generateTableConfigurations(Context context) {
            List<TableConfiguration> configurations = new ArrayList<TableConfiguration>();
            for (String table : TABLES) {
                TableConfiguration configuration = new TableConfiguration(context);
                configuration.setTableName(table);
                configuration.setSelectByExampleStatementEnabled(false);
                configuration.setDeleteByExampleStatementEnabled(false);
                configuration.setCountByExampleStatementEnabled(false);
                configuration.setUpdateByExampleStatementEnabled(false);
                configurations.add(configuration);
            }
            return configurations;
        }
    
    }

第三个类是注释生成器，借鉴了网上一位同行写的详细的注释模板:

import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.List;
    import java.util.Map;
    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.Method;
    import org.mybatis.generator.api.dom.java.Parameter;
    import org.mybatis.generator.api.dom.java.TopLevelClass;
    import org.mybatis.generator.api.dom.xml.TextElement;
    import org.mybatis.generator.api.dom.xml.XmlElement;
    import org.mybatis.generator.config.MergeConstants;
    import org.mybatis.generator.config.PropertyRegistry;
    
    import static org.mybatis.generator.internal.util.StringUtility.isTrue;
    
    /** * Mybatis逆向工程自定义注释生成器 * * @author * @create 2017-09-30 9:22 */
    public class GeneralCommentGenerator implements CommentGenerator { 
    
        /** * The properties. */
        private Properties properties;
    
        /** * The suppress all comments. */
        private boolean suppressAllComments;
    
        /** * The addition of table remark's comments. * If suppressAllComments is true, this option is ignored */
        private boolean addRemarkComments;
    
        private String currentDateStr;
    
        private Map<String, String> userEnv;
    
        /** * Instantiates a new default comment generator. */
        public GeneralCommentGenerator() {
            super();
            properties = new Properties();
            suppressAllComments = false;
            addRemarkComments = false;
            userEnv = System.getenv();
            currentDateStr = (new SimpleDateFormat("yyyy-MM-dd")).format(new Date());
        }
    
        @Override
        public void addConfigurationProperties(Properties properties) {
            this.properties.putAll(properties);
    
            suppressAllComments = isTrue(properties
                .getProperty(PropertyRegistry.COMMENT_GENERATOR_SUPPRESS_ALL_COMMENTS));
    
            addRemarkComments = isTrue(properties
                .getProperty(PropertyRegistry.COMMENT_GENERATOR_ADD_REMARK_COMMENTS));
        }
    
        @Override
        public void addFieldComment(Field field, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
            if (suppressAllComments) {
                return;
            }
            field.addJavaDocLine("/**"); //$NON-NLS-1$
            field.addJavaDocLine(" * " + introspectedColumn.getRemarks());
            field.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addFieldComment(Field field, IntrospectedTable introspectedTable) {
            if (suppressAllComments) {
                return;
            }
            field.addJavaDocLine("/**"); //$NON-NLS-1$
            field.addJavaDocLine(" * " + introspectedTable.getFullyQualifiedTable());
            field.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addModelClassComment(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
            if (suppressAllComments || !addRemarkComments) {
                return;
            }
            topLevelClass.addJavaDocLine("/**"); //$NON-NLS-1$
            topLevelClass.addJavaDocLine(" * 数据库表：" + introspectedTable.getFullyQualifiedTable());
            topLevelClass.addJavaDocLine(" * ");
            topLevelClass.addJavaDocLine(" * @author " + userEnv.get("USERNAME"));
            topLevelClass.addJavaDocLine(" * @create " + currentDateStr);
            topLevelClass.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable) {
            if (suppressAllComments) {
                return;
            }
            innerClass.addJavaDocLine("/**"); //$NON-NLS-1$
            innerClass.addJavaDocLine(" * 数据库表：" + introspectedTable.getFullyQualifiedTable());
            innerClass.addJavaDocLine(" * ");
            innerClass.addJavaDocLine(" * @author " + userEnv.get("USERNAME"));
            innerClass.addJavaDocLine(" * @create " + currentDateStr);
            innerClass.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable, boolean markAsDoNotDelete) {
            addClassComment(innerClass, introspectedTable);
        }
    
        @Override
        public void addEnumComment(InnerEnum innerEnum, IntrospectedTable introspectedTable) {
    
        }
    
        @Override
        public void addGetterComment(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
            if (1 == 1) { //注销getter()方法的注释
                return;
            }
            StringBuilder sb = new StringBuilder();
    
            method.addJavaDocLine("/**"); //$NON-NLS-1$
            // method.addJavaDocLine(" * This method was generated by MyBatis Generator."); //$NON-NLS-1$
    
            sb.append(" * 获取 "); //$NON-NLS-1$
            sb.append(introspectedColumn.getRemarks()).append(" 字段:");
            sb.append(introspectedTable.getFullyQualifiedTable());
            sb.append('.');
            sb.append(introspectedColumn.getActualColumnName());
            method.addJavaDocLine(sb.toString());
    
            method.addJavaDocLine(" *"); //$NON-NLS-1$
    
            sb.setLength(0);
            sb.append(" * @return "); //$NON-NLS-1$
            sb.append(introspectedTable.getFullyQualifiedTable());
            sb.append('.');
            sb.append(introspectedColumn.getActualColumnName());
            sb.append(", ");
            sb.append(introspectedColumn.getRemarks());
            method.addJavaDocLine(sb.toString());
            method.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addSetterComment(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn) {
            if (1 == 1) { //注销setter()方法的注释
                return;
            }
            StringBuilder sb = new StringBuilder();
    
            method.addJavaDocLine("/**"); //$NON-NLS-1$
            // method.addJavaDocLine(" * This method was generated by MyBatis Generator."); //$NON-NLS-1$
    
            sb.append(" * 设置 ");  //$NON-NLS-1$
            sb.append(introspectedColumn.getRemarks()).append(" 字段:");
            sb.append(introspectedTable.getFullyQualifiedTable());
            sb.append('.');
            sb.append(introspectedColumn.getActualColumnName());
            method.addJavaDocLine(sb.toString());
    
            method.addJavaDocLine(" *"); //$NON-NLS-1$
    
            Parameter parm = method.getParameters().get(0);
            sb.setLength(0);
            sb.append(" * @param "); //$NON-NLS-1$
            sb.append(parm.getName());
            sb.append(" the value for "); //$NON-NLS-1$
            sb.append(introspectedTable.getFullyQualifiedTable());
            sb.append('.');
            sb.append(introspectedColumn.getActualColumnName());
            sb.append(", ");
            sb.append(introspectedColumn.getRemarks());
            method.addJavaDocLine(sb.toString());
    
            // addJavadocTag(method, false);
    
            method.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addGeneralMethodComment(Method method, IntrospectedTable introspectedTable) {
            StringBuilder sb = new StringBuilder();
            method.addJavaDocLine("/**"); //$NON-NLS-1$
            sb.append(" * ");
            if (method.isConstructor()) {
                sb.append(" 构造查询条件");
            }
            String method_name = method.getName();
            if ("setOrderByClause".equals(method_name)) {
                sb.append(" 设置排序字段");
            } else if ("setDistinct".equals(method_name)) {
                sb.append(" 设置过滤重复数据");
            } else if ("getOredCriteria".equals(method_name)) {
                sb.append(" 获取当前的查询条件实例");
            } else if ("isDistinct".equals(method_name)) {
                sb.append(" 是否过滤重复数据");
            } else if ("getOrderByClause".equals(method_name)) {
                sb.append(" 获取排序字段");
            } else if ("createCriteria".equals(method_name)) {
                sb.append(" 创建一个查询条件");
            } else if ("createCriteriaInternal".equals(method_name)) {
                sb.append(" 内部构建查询条件对象");
            } else if ("clear".equals(method_name)) {
                sb.append(" 清除查询条件");
            } else if ("countByExample".equals(method_name)) {
                sb.append(" 根据指定的条件获取数据库记录数");
            } else if ("deleteByExample".equals(method_name)) {
                sb.append(" 根据指定的条件删除数据库符合条件的记录");
            } else if ("deleteByPrimaryKey".equals(method_name)) {
                sb.append(" 根据主键删除数据库的记录");
            } else if ("insert".equals(method_name)) {
                sb.append(" 新写入数据库记录");
            } else if ("insertSelective".equals(method_name)) {
                sb.append(" 动态字段,写入数据库记录");
            } else if ("selectByExample".equals(method_name)) {
                sb.append(" 根据指定的条件查询符合条件的数据库记录");
            } else if ("selectByPrimaryKey".equals(method_name)) {
                sb.append(" 根据指定主键获取一条数据库记录");
            } else if ("updateByExampleSelective".equals(method_name)) {
                sb.append(" 动态根据指定的条件来更新符合条件的数据库记录");
            } else if ("updateByExample".equals(method_name)) {
                sb.append(" 根据指定的条件来更新符合条件的数据库记录");
            } else if ("updateByPrimaryKeySelective".equals(method_name)) {
                sb.append(" 动态字段,根据主键来更新符合条件的数据库记录");
            } else if ("updateByPrimaryKey".equals(method_name)) {
                sb.append(" 根据主键来更新符合条件的数据库记录");
            }
            sb.append(",");
            sb.append(introspectedTable.getFullyQualifiedTable());
            method.addJavaDocLine(sb.toString());
    
            final List<Parameter> parameterList = method.getParameters();
            if (!parameterList.isEmpty()) {
                method.addJavaDocLine(" *");
                if ("or".equals(method_name)) {
                    sb.append(" 增加或者的查询条件,用于构建或者查询");
                }
            } else {
                if ("or".equals(method_name)) {
                    sb.append(" 创建一个新的或者查询条件");
                }
            }
            String paramterName;
            for (Parameter parameter : parameterList) {
                sb.setLength(0);
                sb.append(" * @param "); //$NON-NLS-1$
                paramterName = parameter.getName();
                sb.append(paramterName);
                if ("orderByClause".equals(paramterName)) {
                    sb.append(" 排序字段"); //$NON-NLS-1$
                } else if ("distinct".equals(paramterName)) {
                    sb.append(" 是否过滤重复数据");
                } else if ("criteria".equals(paramterName)) {
                    sb.append(" 过滤条件实例");
                }
                method.addJavaDocLine(sb.toString());
            }
            if (method.getReturnType() != null) {
                method.addJavaDocLine(" * @return");
            }
            method.addJavaDocLine(" */"); //$NON-NLS-1$
        }
    
        @Override
        public void addJavaFileComment(CompilationUnit compilationUnit) {
        }
    
        @Override
        public void addComment(XmlElement xmlElement) {
            //当XmlElement添加了@mbg.generated后,下次再执行Mybatis Generate时不会重复生成此元素,但会将此元素还原成最初版本
            xmlElement.addElement(new TextElement("")); //$NON-NLS-1$
        }
    
        @Override
        public void addRootComment(XmlElement rootElement) {
        int size = rootElement.getElements().size();
            rootElement.addElement(size, new TextElement(""));
        }
    
    }

最后一个类是逆向工程执行器，执行Main方法，同时做一些日志及执行前的校验工作:

package com.bob.config.root.mybatis.generate;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    import org.mybatis.generator.api.MyBatisGenerator;
    import org.mybatis.generator.config.Configuration;
    import org.mybatis.generator.internal.DefaultShellCallback;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.core.io.FileSystemResource;
    import org.springframework.core.io.Resource;
    import org.springframework.util.Assert;
    import org.springframework.util.ClassUtils;
    import org.springframework.util.StringUtils;
    
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.DEFAULT_JAVA_TARGETPROJECT;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.DEFAULT_RESOURCES_TARGETPROJECT;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVACLIENT_TARGETPACKAGE;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.JAVA_MODEL_TARGETPACKAGE;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.OVERRIDE_EXIST;
    import static com.bob.config.root.mybatis.generate.MybatisGenerateConfigs.SQLMAP_TARGETPACKAGE;
    
    /** * Mybatis逆向工程解析器 * 基于Mybatis Generator 1.3.5 Release * * @author wb-jjb318191 * @create 2017-09-28 17:08 */
    public class MybatisGenerator { 
    
        private static final Logger LOGGER = LoggerFactory.getLogger(MybatisGenerator.class);
    
        /** * Main函数,执行逆向工程 * * @param args * @throws Exception */
        public static void main(String[] args) throws Exception {
            MybatisGenerator.generate();
    
        }
    
        /** * 获取项目根路径 * * @return * @throws IOException */
        private String getRootPath() throws IOException {
            String classPath = this.replaceDotByDelimiter(this.getClass().getName()) + ".class";
            Resource resource = new ClassPathResource(classPath);
            String path = resource.getFile().getAbsolutePath();
            path = path.substring(0, path.indexOf("\\target"));
            return path.substring(0, path.lastIndexOf("\\"));
        }
    
        /** * 执行逆向工程 * 使用配置好的执行策略{@linkplain MybatisGenerateConfigs} * * @throws Exception */
        public static void generate() throws Exception {
            new MybatisGenerator().generate(OVERRIDE_EXIST);
            new MybatisGenerator().generate(true);
        }
    
        /** * 执行逆向工程 * * @param override 是否覆盖已存在的Model,Dao,Mapper * @throws Exception */
        private void generate(boolean override) throws Exception {
            if (!override) {
                inspectGeneratedFilesExists();
            }
            Configuration config = new MybatisGeneratorConfiguration().configMybatisGenerator();
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, new DefaultShellCallback(true), new ArrayList<String>());
            myBatisGenerator.generate(null);
        }
    
        /** * 检测将通过逆向工程生成的Model,Dao,Mapper是否已存在 * * @throws Exception */
        private void inspectGeneratedFilesExists() throws Exception {
            LOGGER.info("非覆盖式执行Mybatis Generate,检查将要生成的文件是否已存在！");
            List<String> classNames = convertTableToClassName(MybatisGenerateConfigs.TABLES);
    
            String mapperPackage = replaceDotByDelimiter(SQLMAP_TARGETPACKAGE);
    
            String remindMsg = "即将覆盖{}[{}],请确认做好备份后设置[{}]属性为true,执行后请还原为false";
            String override = MybatisGenerateConfigs.class.getSimpleName() + "." + "OVERRIDE_EXIST";
            boolean exists = false;
            for (String clazzName : classNames) {
                String modelName = JAVA_MODEL_TARGETPACKAGE + "." + clazzName;
                if (exists = isClassExists(modelName)) {
                    LOGGER.warn(remindMsg, "Model Class", modelName, override);
                }
                String daoName = JAVACLIENT_TARGETPACKAGE + "." + clazzName + "Mapper";
                if (exists = isClassExists(daoName)) {
                    LOGGER.warn(remindMsg, "DAO Class", daoName, override);
                }
                String mapperPath = mapperPackage + "/" + clazzName + "Mapper.xml";
                if (exists = isMapperExists(mapperPath)) {
                    LOGGER.warn(remindMsg, "Mapper XML", mapperPath, override);
                }
            }
            if (exists) {
                throw new IllegalStateException("逆向工程生成的文件将会覆盖已存在文件，请备份好后设置覆盖式执行");
            }
        }
    
        /** * 依据驼峰原则格式化将表名转换为类名,当遇到下划线时去除下划线并对之后的一位字符大写 * * @param tables * @return */
        private List<String> convertTableToClassName(List<String> tables) {
            List<String> classes = new ArrayList<String>();
            for (String table : tables) {
                classes.add(convertTableToClassName(table));
            }
            return classes;
        }
    
        /** * 依据驼峰原则格式化将表名转换为类名,当遇到下划线时去除下划线并对之后的一位字符大写 * * @param table * @return */
        private String convertTableToClassName(String table) {
            Assert.hasText(table, "表名不能为空");
            StringBuilder sb = new StringBuilder();
            sb.append(toUpperCase(table.charAt(0)));
            for (int i = 1; i < table.length(); i++) {
                sb.append('_' == table.charAt(i) ? toUpperCase(table.charAt(++i)) : table.charAt(i));
            }
            return sb.toString();
        }
    
        /** * 将字符转换为大写 * * @param ch * @return */
        private char toUpperCase(char ch) {
            return Character.toUpperCase(ch);
        }
    
        /** * 使用'/'替换路径中的'.' * * @param path * @return */
        private String replaceDotByDelimiter(String path) {
            Assert.hasText(path, "替换路径不能为空");
            return StringUtils.replace(path, ".", "/");
        }
    
        /** * 项目是否是多模块项目 * * @return */
        private boolean isMultiModuleProject() {
            return !DEFAULT_JAVA_TARGETPROJECT.startsWith("src");
        }
    
        /** * 验证类是否存在 * * @param className * @return */
        private boolean isClassExists(String className) throws IOException {
            String javaSuffix = ".java";
            Assert.hasText(className, "类名不能为空");
            if(isMultiModuleProject()){
                String absPath = this.getRootPath() + "/" + DEFAULT_JAVA_TARGETPROJECT + "/" +replaceDotByDelimiter(className) + javaSuffix;
                return new FileSystemResource(absPath).exists();
            }
            return ClassUtils.isPresent(className, this.getClass().getClassLoader());
        }
    
        /** * 验证文件是否存在 * * @param mapperPath * @return */
        public boolean isMapperExists(String mapperPath) throws IOException {
            Assert.hasText(mapperPath, "Mapper路径不能为空");
            if(isMultiModuleProject()){
                String absPath = this.getRootPath() + "/" + DEFAULT_RESOURCES_TARGETPROJECT + "/" + mapperPath;
                return new FileSystemResource(absPath).exists();
            }
            return new ClassPathResource(mapperPath).exists();
        }
    
    }

以上就是基于Java形式的Mybatis Generator，代码没有太多优化，好用就行。  
如果有什么问题和建议可以提。