用java代码编写工具类，实现entity、dao 、service 、serviceImpl自动生成。
参考开源csdn一位博友写的，改动了部分实现自己需求规则
http://blog.csdn.net/u010137431/article/details/46595487
生成配置项：
/model.ftl /dao.ftl /service.ftl com.wjw.xincms.server.service com.wjw.xincms.server.dao com.wjw.xincms.entity User 用户 Role 角色
读取配置项，生成的实体、dao、service的位置，需要生成的实体类等：
package com.wjw.framework.generate;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;import freemarker.template.TemplateException;public class Generate { public static void main(String[] args) throws IOException, TemplateException, ParserConfigurationException, SAXException { String ftlPath = ""; //模板路径 //model参数 String ModelftlName = ""; //model模板名称 String ModelfilePath = ""; //模板路径 String ModelpackgeName = "";//模板包名 List modellist = new ArrayList (); //需要生成的实体对象集合 // dao参数 String DaoftlName = ""; //dao模板名称 String DaofilePath = ""; //dao路径 String DaopackgeName = ""; //dao包名 //service参数 String ServiceftlName = ""; //Service模板名称 String ServicefilePath = ""; //service路径 String ServicepackgeName = "";//service包名 //配置文件位置 File xmlFile = new File(System.getProperty("user.dir"), "\\src\\main\\java\\com\\wjw\\framework\\generate\\GenerateConf.xml"); DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = builderFactory.newDocumentBuilder(); Document doc = builder.parse(xmlFile); Element rootElement = doc.getDocumentElement(); //获取根元素 Node ftlnode = rootElement.getElementsByTagName("ftl").item(0); ftlPath = ((Element)ftlnode).getAttribute("path"); NodeList params = ftlnode.getChildNodes(); for(int i = 0; i < params.getLength(); i++){//获取对应模板名称 Node node = params.item(i); if(node.getNodeType() != Node.ELEMENT_NODE) continue; Element e = (Element)node; if(e.getAttribute("name").trim().equals("model")) ModelftlName = node.getFirstChild().getNodeValue(); if(e.getAttribute("name").trim().equals("dao")) DaoftlName = node.getFirstChild().getNodeValue(); if(e.getAttribute("name").trim().equals("service")) ServiceftlName = node.getFirstChild().getNodeValue(); } //获取对应service参数 Node servicenode = rootElement.getElementsByTagName("service").item(0); ServicefilePath = ((Element)servicenode).getAttribute("path"); ServicepackgeName = servicenode.getChildNodes().item(1).getFirstChild().getNodeValue(); //获取对应dao参数 Node daonode = rootElement.getElementsByTagName("dao").item(0); DaofilePath = ((Element)daonode).getAttribute("path"); DaopackgeName = daonode.getChildNodes().item(1).getFirstChild().getNodeValue(); //获取对应model参数 Node modelnode = rootElement.getElementsByTagName("models").item(0); ModelfilePath = ((Element)modelnode).getAttribute("path"); params = modelnode.getChildNodes(); for(int i = 0; i < params.getLength(); i++){ Node node = params.item(i); if(node.getNodeType() != Node.ELEMENT_NODE) continue; Element e = (Element)node; if(e.getNodeName().trim().equals("packageName")) ModelpackgeName = node.getFirstChild().getNodeValue(); if(e.getNodeName().trim().equals("model")){ Attr attr = new Attr(); NodeList attrnode = node.getChildNodes(); for(int j = 0; j < attrnode.getLength(); j++){ Node anode = attrnode.item(j); if(anode.getNodeType() != Node.ELEMENT_NODE) continue; Element ae = (Element)anode; if(ae.getTagName().trim().equals("className")) attr.setClassName(anode.getFirstChild().getNodeValue()); if(ae.getTagName().trim().equals("desc")) attr.setDesc(anode.getFirstChild().getNodeValue()); } modellist.add(attr); } } GenerateUtil gt =new GenerateUtil("wjw",ftlPath); gt.GenerateDao(DaoftlName, DaofilePath, DaopackgeName, ModelpackgeName,modellist); gt.GenerateService(ServiceftlName, ServicefilePath, ServicepackgeName, DaopackgeName, ModelpackgeName,modellist); gt.GenerateModel(ModelftlName, ModelfilePath, ModelpackgeName, modellist); }} GenerateUtil gt =new GenerateUtil("wjw",ftlPath);//传入生成的作者名 ,生成模板路径
//生成model实体类
gt.GenerateModel(ModelftlName, ModelfilePath, ModelpackgeName, modellist);
//生成dao
gt.GenerateDao(DaoftlName, DaofilePath, DaopackgeName, ModelpackgeName,modellist);
//生成service和serviceImpl实现
gt.GenerateService(ServiceftlName, ServicefilePath, ServicepackgeName, DaopackgeName, ModelpackgeName,modellist);
获取需要生成的参数传入freemarker模板中，写入到指路径下package com.wjw.framework.generate;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.StringWriter;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import org.wjw.utils.DateUtil;import org.wjw.utils.HumpUtils;import freemarker.template.Configuration;import freemarker.template.Template;import freemarker.template.TemplateException;/** * @desc 生成工具类 * @author wjw * @date 2016年12月21日下午4:31:29 */public class GenerateUtil { public String author="wjw";//设置默认作者 public String ftlPath;//模板所在路径 public GenerateUtil() { } public GenerateUtil(String author,String ftlPath) { this.author = author; this.ftlPath = ftlPath; path_Judge_Exist(ftlPath); } /** * @desc model生成方法 * @param ftlName 模板名 * @param filePath model层的路径 * @param packageName model包名 * @param list model参数集合 */ public void GenerateModel(String ftlName, String filePath, String packageName, List list) throws IOException, TemplateException{ path_Judge_Exist(filePath); //实体类需要其他参数 Map root = new HashMap (); root.put("packageName", packageName); root.put("author", author); for(Attr a : list){ String className = a.getClassName(); root.put("desc", a.getDesc()); root.put("createDate", DateUtil.formatDate(new Date(), "yyyy年MM月dd日aK:mm:ss") ); root.put("className", className); root.put("table", HumpUtils.camelToUnderline2(className)); Configuration cfg = new Configuration(); String path = System.getProperty("user.dir") + ftlPath; cfg.setDirectoryForTemplateLoading(new File(path)); Template template = cfg.getTemplate(ftlName); printFile(root, template, filePath, className); } } /** * @desc dao生成方法 * @param ftlName * @param filePath * @param packageName * @param modelPackageName * @param list * @throws IOException * @throws TemplateException */ public void GenerateDao(String ftlName, String filePath, String packageName, String modelPackageName,List list) throws IOException, TemplateException { path_Judge_Exist(filePath); //实体类需要其他参数 Map root = new HashMap (); root.put("packageName", packageName); root.put("author", author); root.put("modelPackageName", modelPackageName); for(Attr a : list){ String modelClassName = a.getClassName(); root.put("modelClassName", modelClassName); root.put("desc", a.getDesc()); root.put("createDate", DateUtil.formatDate(new Date(), "yyyy年MM月dd日aK:mm:ss") ); Configuration cfg = new Configuration(); String path = System.getProperty("user.dir") + ftlPath; cfg.setDirectoryForTemplateLoading(new File(path)); Template template = cfg.getTemplate(ftlName); printFile(root, template, filePath, modelClassName + "Dao"); } } /** * @desc servic接口和实现的生成方法 * @param ftlName * @param filePath * @param packageName * @param daoPackageName * @param modelPackageName * @param list * @throws IOException * @throws TemplateException */ public void GenerateService(String ftlName,String filePath, String packageName,String daoPackageName, String modelPackageName,List list) throws IOException, TemplateException { String ImplFilePath = filePath + "\\impl"; path_Judge_Exist(filePath); path_Judge_Exist(ImplFilePath); Map root = new HashMap (); root.put("author", author); root.put("daoPackageName", daoPackageName); root.put("packageName", packageName); root.put("implPackageName", packageName+".impl"); root.put("modelPackageName", modelPackageName); for(Attr a : list){ String className = a.getClassName();//类名 root.put("desc", a.getDesc()); root.put("createDate", DateUtil.formatDate(new Date(), "yyyy年MM月dd日aK:mm:ss") ); root.put("className", className); root.put("implflag", false);//接口 Configuration cfg = new Configuration(); String path = System.getProperty("user.dir") + ftlPath; cfg.setDirectoryForTemplateLoading(new File(path)); Template template = cfg.getTemplate(ftlName); printFile(root, template, filePath, className + "Service");//生成service接口 root.put("implflag", true);//实现 printFile(root, template, ImplFilePath, className + "ServiceImpl");//生成service实现 } } //判断包路径是否存在 public static void path_Judge_Exist(String path){ File file = new File(System.getProperty("user.dir"), path); if(!file.exists()) file.mkdirs(); } //输出到文件 public static void printFile(Map root, Template template, String filePath, String fileName) throws IOException, TemplateException { String path = System.getProperty("user.dir") + filePath; File file = new File(path, fileName + ".java"); if(!file.exists()) file.createNewFile(); FileWriter fw = new FileWriter(file); template.process(root, fw); fw.close(); } //输出到控制台 public static void printConsole(Map root, Template template) throws TemplateException, IOException { StringWriter out = new StringWriter(); template.process(root, out); System.out.println(out.toString()); } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public String getFtlPath() { return ftlPath; } public void setFtlPath(String ftlPath) { this.ftlPath = ftlPath; }} 下面贴出模板model、dao、service模板：
package ${packageName};import javax.persistence.Entity;import javax.persistence.Table;import com.wjw.framework.spring.persistence.BaseEntity;/** * @desc ${desc}-实体类 * @author ${author} * @date ${createDate} */@Entity@Table(name = "${table}")public class ${className} extends BaseEntity { } package ${packageName};import org.springframework.data.jpa.repository.JpaSpecificationExecutor;import org.springframework.data.repository.PagingAndSortingRepository;import ${modelPackageName}.${modelClassName};/** * @desc ${desc}-Dao * @author ${author} * @date ${createDate} */public interface ${modelClassName}Dao extends PagingAndSortingRepository<${modelClassName}, String>, JpaSpecificationExecutor<${modelClassName}> { } <#if !implflag>package ${packageName};import ${modelPackageName}.${className};/** * @desc ${desc}-服务接口 * @author ${author} * @date ${createDate} */public interface ${className}Service { public void save(${className} ${className?lower_case});}<#else>package ${implPackageName};import ${modelPackageName}.${className};import ${daoPackageName}.${className}Dao;import ${packageName}.${className}Service;import org.springframework.beans.factory.annotation.Autowired;/** * @desc ${desc}-服务实现 * @author ${author} * @date ${createDate} */public class ${className}ServiceImpl implements ${className}Service { @Autowired private ${className}Dao ${className?lower_case}Dao; @Override public void save(${className} ${className?lower_case}) { // TODO Auto-generated method stub }} 下面是接收需要生成的实体对象类：
package com.wjw.framework.generate;public class Attr { private String className; //类名 private String desc; //描述 public Attr() { // TODO Auto-generated constructor stub } public Attr(String className,String desc) { this.className=className; this.desc=desc; } public String getClassName() { return className; } public void setClassName(String className) { this.className = className; } public String getDesc() { return desc; } public void setDesc(String desc) { this.desc = desc; }} 最后生成的代码截图
可根据自己用的框架来修改模板实现自己的需求。
我去掉了具体的字段生成，在需求中字段是经常增加修改的，添加几个字段用eclipse的快捷键shirt+alt+s也能快速生成set、get方法，通过数据库生成实体类我用不到，我的是实体类通过hibernate生成数据库表，根据自己的需求修改生成规则