自己闲着没事就是这些了些自动代码生成器，根据实体类，利用反射自动生成controller，service，mapper，等相关文件。下面是具体代码

如何使用可以参照我github上的项目，里面有具体的模板文件

https://github.com/kongGe55/mapper_test

这个项目结合了这个工具类的具体使用，大家可以根据自己的项目业务自由定制修改，甚至可以修改后生成后台html模板文件

package cn.haiwei.csovsserver;import cn.haiwei.csovsserver.model.Role;import cn.haiwei.csovsserver.model.ScheduledTasks;import freemarker.template.*;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.*;import java.lang.reflect.Field;import java.util.*;/ * ClassName: GeneratorCode * Description: * date: 2019/6/27 10:10 * * @author JiLiugang * @version 1.0 * @since JDK 1.8 */public class GeneratorCode {    private final static String TEMPLATE_PATH = "src\\main\\java\\cn\\jiliugang\\package\\templates";    private static Configuration configuration = null;    private static List<Map<String,String>> fieldNameTypeMap = new ArrayList<>();    private static Logger logger = LoggerFactory.getLogger(GeneratorCode.class);    //项目主包名称    private final static String packageName = "cn.jiliugang.package";    public static void main(String[] args) { GeneratorCode.generatorCode(Role.class);    }    public static void generatorCode(Class entityClass) { //Configuration initConfiguration(); //初始化查找实体类属性信息 fieldNameTypeMap = getFieldInfo(entityClass); //得到对应渲染数据 Map<String,Object> serviceClassInfo = getClassInfo(entityClass,"Service"); Map<String,Object> implClassInfo = getClassInfo(entityClass,"ServiceImpl"); Map<String,Object> mapperClassInfo = getClassInfo(entityClass,"Mapper"); Map<String,Object> controllerClassInfo = getClassInfo(entityClass,"Controller"); Map<String,Object> mapperXml = getClassInfo(entityClass,"MapperXml"); generatorFile(mapperClassInfo); generatorFile(serviceClassInfo); generatorFile(implClassInfo); generatorFile(controllerClassInfo); generatorFile(mapperXml);    }    private static void initConfiguration() { configuration = new Configuration(Configuration.getVersion()); try {     configuration.setDirectoryForTemplateLoading(new File(TEMPLATE_PATH)); } catch (IOException e) {     e.printStackTrace(); }    }    private static List<Map<String, String>> getFieldInfo(Class entityClass) { //得到属性名 Field[] declaredFields = entityClass.getDeclaredFields(); List<Map<String, String>> fieldNameTypeMap = new ArrayList<>(); for (Field field : declaredFields){     Map<String, String> fieldMap = new HashMap<>();     String type = field.getType().getSimpleName();     String name = field.getName();     //将属性名和对应类型放入map中     fieldMap.put("name",name);     fieldMap.put("type",type);     fieldNameTypeMap.add(fieldMap); } return fieldNameTypeMap;    }    private static Map getClassInfo(Class entity,String typeName) { Map<String,Object> map = new HashMap<>(); map.put("templateName",typeName+".ftl"); map.put("packageName",packageName); //实体对象名称 String className = entity.getSimpleName(); map.put("className",className); map.put("classParamName",toLowerCaseFirstOne(className)); map.put("EntityClassPath",entity.getName()); //得到路径 String realPath = null; String classPath = null; String classTypeName = null; Boolean isXml = false; if ("Service".equals(typeName)){     realPath = "src.main.java."+packageName+".service";     classPath = packageName+".service";     classTypeName = className+"Service"; }else if ("ServiceImpl".equals(typeName)){     realPath = "src.main.java."+packageName+".service.impl";     classPath = packageName+".service.impl";     classTypeName = className+"ServiceImpl"; }else if ("Mapper".equals(typeName)){     realPath = "src.main.java."+packageName+".mapper";     classPath = packageName+".mapper";     classTypeName = className+"Mapper"; }else if ("Controller".equals(typeName)){     realPath = "src.main.java."+packageName+".controller";     classPath = packageName+".controller";     classTypeName = className+"Controller"; }else if ("MapperXml".equals(typeName)){     realPath = "src.main.resources.mapper";     classTypeName = className+"Mapper";     //应对嵌套渲染问题     map.put("sqlPinJie","#{");     isXml = true; } map.put("isXml",isXml); map.put("classTypeName",classTypeName); map.put("realPath",realPath); map.put("classPath",classPath); //日期 map.put("date",new Date().toString()); map.put("fields",fieldNameTypeMap); return map;    }    public static void generatorFile(Map<String,Object> classInfo){ Writer out = null; // step4 加载模版文件 Template template = null; try {     template = configuration.getTemplate((String) classInfo.get("templateName"));     // step5 生成数据     String filePath = (String) classInfo.get("realPath");     filePath = filePath.replaceAll("\\.","\\\\");     File directory = new File(filePath);     if (!directory.exists()){  directory.mkdirs();     }     File docFile = null;     if ((Boolean) classInfo.get("isXml")){  docFile = new File(filePath + "\\" + classInfo.get("classTypeName")+".xml");     }else {  docFile = new File(filePath + "\\" + classInfo.get("classTypeName")+".java");     }     out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(docFile)));     // step6 输出文件     template.process(classInfo, out); } catch (IOException e) {     e.printStackTrace(); } catch (TemplateException e) {     e.printStackTrace(); } if ((Boolean) classInfo.get("isXml")){     logger.info("----------------"+classInfo.get("classTypeName")+".xml 文件创建成功 !"); }else {     logger.info("----------------"+classInfo.get("classTypeName")+".java 文件创建成功 !"); }    }    //首字母转小写    public static String toLowerCaseFirstOne(String s){ if(Character.isLowerCase(s.charAt(0)))     return s; else     return (new StringBuilder()).append(Character.toLowerCase(s.charAt(0))).append(s.substring(1)).toString();    }}