背景介绍：
工作中经常用到单表的增删该查包括分页，定义实体对象和写一些单表dao，代码单一，重复性工作多。毕竟作为开发人员大多数时间应该关注业务，代码自动生成就会节省很多重复性工作。网上有很多文章，简单做下总结和记录。
代码生成工具
根据项目需要定义项目包名和数据库连接信息：
代码语言：javascript复制package com.wyh.generate.ormcodegenerate;
import com.google.common.base.CaseFormat;
import freemarker.template.TemplateExceptionHandler;
import org.apache.commons.lang3.StringUtils;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.*;
import org.mybatis.generator.internal.DefaultShellCallback;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.*;
import static com.wyh.generate.ormcodegenerate.ProjectConstant.*;
/**
* 代码生成器，根据数据表名称生成对应的Model、Mapper、Service、Controller简化开发。
*/
public class CodeGenerator {
private static final String PROJECT_PATH = System.getProperty("user.dir");//项目在硬盘上的基础路径
private static final String TEMPLATE_FILE_PATH = PROJECT_PATH "/src/test/resources/generator/template";//模板位置
private static final String JAVA_PATH = "/src/main/java"; //java文件路径
private static final String RESOURCES_PATH = "/src/main/resources";//资源文件路径
private static final String PACKAGE_PATH_SERVICE = packageConvertPath(SERVICE_PACKAGE);//生成的Service存放路径
private static final String PACKAGE_PATH_SERVICE_IMPL = packageConvertPath(SERVICE_IMPL_PACKAGE);//生成的Service实现存放路径
private static final String PACKAGE_PATH_CONTROLLER = packageConvertPath(CONTROLLER_PACKAGE);//生成的Controller存放路径
private static final String AUTHOR = "CodeGenerator";//@author
private static final String DATE = new SimpleDateFormat("yyyy/MM/dd").format(new Date());//@date
public static void main(String[] args) {
genCode("event");
//genCode("输入表名","输入自定义Model名称");
}
/**
* 通过数据表名称生成代码，Model 名称通过解析数据表名称获得，下划线转大驼峰的形式。
* 如输入表名称 "t_user_detail" 将生成 TUserDetail、TUserDetailMapper、TUserDetailService ...
* @param tableNames 数据表名称...
*/
public static void genCode(String... tableNames) {
for (String tableName : tableNames) {
genCode(tableName, null);
}
}
/**
* 通过数据表名称，和自定义的 Model 名称生成代码
* 如输入表名称 "t_user_detail" 和自定义的 Model 名称 "User" 将生成 User、UserMapper、UserService ...
* @param tableName 数据表名称
* @param modelName 自定义的 Model 名称
*/
public static void genCode(String tableName, String modelName) {
genModelAndMapper(tableName, modelName);
genService(tableName, modelName);
genController(tableName, modelName);
}
public static void genModelAndMapper(String tableName, String modelName) {
Context context = new Context(ModelType.FLAT);
context.setId("Potato");
context.setTargetRuntime("MyBatis3Simple");
context.addProperty(PropertyRegistry.CONTEXT_BEGINNING_DELIMITER, "`");
context.addProperty(PropertyRegistry.CONTEXT_ENDING_DELIMITER, "`");
JDBCConnectionConfiguration jdbcConnectionConfiguration = new JDBCConnectionConfiguration();
jdbcConnectionConfiguration.setConnectionURL(JDBC_URL);
jdbcConnectionConfiguration.setUserId(JDBC_USERNAME);
jdbcConnectionConfiguration.setPassword(JDBC_PASSWORD);
jdbcConnectionConfiguration.setDriverClass(JDBC_DIVER_CLASS_NAME);
context.setJdbcConnectionConfiguration(jdbcConnectionConfiguration);
PluginConfiguration pluginConfiguration = new PluginConfiguration();
pluginConfiguration.setConfigurationType("tk.mybatis.mapper.generator.MapperPlugin");
pluginConfiguration.addProperty("mappers", MAPPER_INTERFACE_REFERENCE);
context.addPluginConfiguration(pluginConfiguration);
JavaModelGeneratorConfiguration javaModelGeneratorConfiguration = new JavaModelGeneratorConfiguration();
javaModelGeneratorConfiguration.setTargetProject(PROJECT_PATH JAVA_PATH);
javaModelGeneratorConfiguration.setTargetPackage(MODEL_PACKAGE);
context.setJavaModelGeneratorConfiguration(javaModelGeneratorConfiguration);
SqlMapGeneratorConfiguration sqlMapGeneratorConfiguration = new SqlMapGeneratorConfiguration();
sqlMapGeneratorConfiguration.setTargetProject(PROJECT_PATH RESOURCES_PATH);
sqlMapGeneratorConfiguration.setTargetPackage("mapper");
context.setSqlMapGeneratorConfiguration(sqlMapGeneratorConfiguration);
JavaClientGeneratorConfiguration javaClientGeneratorConfiguration = new JavaClientGeneratorConfiguration();
javaClientGeneratorConfiguration.setTargetProject(PROJECT_PATH JAVA_PATH);
javaClientGeneratorConfiguration.setTargetPackage(MAPPER_PACKAGE);
javaClientGeneratorConfiguration.setConfigurationType("XMLMAPPER");
context.setJavaClientGeneratorConfiguration(javaClientGeneratorConfiguration);
TableConfiguration tableConfiguration = new TableConfiguration(context);
tableConfiguration.setTableName(tableName);
tableConfiguration.setDomainObjectName(modelName);
tableConfiguration.setGeneratedKey(new GeneratedKey("id", "Mysql", true, null));
context.addTableConfiguration(tableConfiguration);
List<String> warnings;
MyBatisGenerator generator;
try {
Configuration config = new Configuration();
config.addContext(context);
config.validate();
boolean overwrite = true;
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
warnings = new ArrayList<String>();
generator = new MyBatisGenerator(config, callback, warnings);
generator.generate(null);
} catch (Exception e) {
throw new RuntimeException("生成Model和Mapper失败", e);
}
if (generator.getGeneratedJavaFiles().isEmpty() || generator.getGeneratedXmlFiles().isEmpty()) {
throw new RuntimeException("生成Model和Mapper失败：" warnings);
}
if (StringUtils.isEmpty(modelName)) modelName = tableNameConvertUpperCamel(tableName);
System.out.println(modelName ".java 生成成功");
System.out.println(modelName "Mapper.java 生成成功");
System.out.println(modelName "Mapper.xml 生成成功");
}
public static void genService(String tableName, String modelName) {
try {
freemarker.template.Configuration cfg = getConfiguration();
Map<String, Object> data = new HashMap<>();
data.put("date", DATE);
data.put("author", AUTHOR);
String modelNameUpperCamel = StringUtils.isEmpty(modelName) ? tableNameConvertUpperCamel(tableName) : modelName;
data.put("modelNameUpperCamel", modelNameUpperCamel);
data.put("modelNameLowerCamel", tableNameConvertLowerCamel(tableName));
data.put("basePackage", BASE_DAL_PACKAGE);
File file = new File(PROJECT_PATH JAVA_PATH PACKAGE_PATH_SERVICE modelNameUpperCamel "Service.java");
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
cfg.getTemplate("service.ftl").process(data,
new FileWriter(file));
System.out.println(modelNameUpperCamel "Service.java 生成成功");
File file1 = new File(PROJECT_PATH JAVA_PATH PACKAGE_PATH_SERVICE_IMPL modelNameUpperCamel "ServiceImpl.java");
if (!file1.getParentFile().exists()) {
file1.getParentFile().mkdirs();
}
cfg.getTemplate("service-impl.ftl").process(data,
new FileWriter(file1));
System.out.println(modelNameUpperCamel "ServiceImpl.java 生成成功");
} catch (Exception e) {
throw new RuntimeException("生成Service失败", e);
}
}
public static void genController(String tableName, String modelName) {
try {
freemarker.template.Configuration cfg = getConfiguration();
Map<String, Object> data = new HashMap<>();
data.put("date", DATE);
data.put("author", AUTHOR);
String modelNameUpperCamel = StringUtils.isEmpty(modelName) ? tableNameConvertUpperCamel(tableName) : modelName;
data.put("baseRequestMapping", modelNameConvertMappingPath(modelNameUpperCamel));
data.put("modelNameUpperCamel", modelNameUpperCamel);
data.put("modelNameLowerCamel", CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_CAMEL, modelNameUpperCamel));
data.put("basePackage", BASE_DAL_PACKAGE);
File file = new File(PROJECT_PATH JAVA_PATH PACKAGE_PATH_CONTROLLER modelNameUpperCamel "Controller.java");
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
//cfg.getTemplate("controller-restful.ftl").process(data, new FileWriter(file));
cfg.getTemplate("controller.ftl").process(data, new FileWriter(file));
System.out.println(modelNameUpperCamel "Controller.java 生成成功");
} catch (Exception e) {
throw new RuntimeException("生成Controller失败", e);
}
}
private static freemarker.template.Configuration getConfiguration() throws IOException {
freemarker.template.Configuration cfg = new freemarker.template.Configuration(freemarker.template.Configuration.VERSION_2_3_23);
cfg.setDirectoryForTemplateLoading(new File(TEMPLATE_FILE_PATH));
cfg.setDefaultEncoding("UTF-8");
cfg.setTemplateExceptionHandler(TemplateExceptionHandler.IGNORE_HANDLER);
return cfg;
}
private static String tableNameConvertLowerCamel(String tableName) {
return CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, tableName.toLowerCase());
}
private static String tableNameConvertUpperCamel(String tableName) {
return CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, tableName.toLowerCase());
}
private static String tableNameConvertMappingPath(String tableName) {
tableName = tableName.toLowerCase();//兼容使用大写的表名
return "/" (tableName.contains("_") ? tableName.replaceAll("_", "/") : tableName);
}
private static String modelNameConvertMappingPath(String modelName) {
String tableName = CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, modelName);
return tableNameConvertMappingPath(tableName);
}
private static String packageConvertPath(String packageName) {
return String.format("/%s/", packageName.contains(".") ? packageName.replaceAll("\.", "/") : packageName);
}
}demo
?orm-code-generate.zip
