代码生成器，极大简化你的工作

        在web开发中，模块化开发非常普遍。在最近的毕业设计中，自己基于spring mvc + mybatics + liger ui开发了一个网站，里面也使用模块化来组织代码。于是每一个模块的操作，基本上都是大同小异，无非就是增删改查。下面先观察下代码的包组织结构，以及jsp文件组织结构：如下图所示。

        从图中可以看出，一个模块通常情况下也会有一个相应的jsp文件夹。这样子给代码生成器的开发埋下了伏笔。

        继续观察代码组织结构，我们通常在模块下面又使用dao层，service层，controller层，entity层来组织代码。其中dao层用于访问数据库；service层属于dao层的门面设计模式，通常可以根据业务逻辑需要，调用多个dao层来完成任务；controller层则是controller类，通常由Add、delete、update、list四个controller类，每个类只有一个核心功能；entity层则是实体类，在这个工程里面，将mybatics的mapper类放在这里。下面我们来查看下一个模块的代码组织，如下图所示。

        从图中可以看出，代码命名规则非常的明确，这样子的命名规则，可以很方便的使用代码生成器来生成这些代码。

        为了开发方便，于是花了点时间，写了个代码生成器。该代码生成器的主要目标就是用户给出实体类，则程序自动生成controller、dao、service、mapper、jsp等模板文件。开发者只需要根据业务逻辑需要，将sql放入到mapper中，就能快速完成新模块功能的开发。

        类的开发比较简单，主要就是得到工程所在路径，根据给出entity实体，自动生成dao、service、controller、mapper、jsp等文件。由于该类没什么技术难度，就直接贴代码了。

<span style="font-size:18px;">package net.itaem.autogeneratecode;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import net.itaem.department.entity.Department;/** * 自动代码生成器 * 1、代码生成器需要做的功能： * 给出Entity，生成Mybatics Mapper，生成成Dao层，service层，以及controller层，以及jsp文件 *  * 生成的这些文件中，全部都是骨架代码，开发时需要根据具体要求添加业务逻辑代码即可 * @author luohong [e-mail] 15013336884 * */public class AutomaticGenerateCode {    public static void main(String[] args) throws IOException{generateMybaticsMapper(Department.class);generateDao(Department.class);generateService(Department.class);generateController(Department.class);generateJsp(Department.class);}/** * 生成mybatics的mapper类 * @param clazz * */public static void generateMybaticsMapper(Class<?> clazz) throws IOException{String path = path(clazz);String mapperDirectoryName = path.substring(0, path.lastIndexOf("\\")) + File.separator + "entity";File mapperDirectory = new File(mapperDirectoryName);if(!mapperDirectory.exists()){mapperDirectory.mkdir();}String mapperJavaFileName = mapperDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "Mapper.java";File mapperJavaFile = new File(mapperJavaFileName);StringBuilder contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity;");contentBuilder.append("\n\n");contentBuilder.append("import java.util.*;\n");contentBuilder.append("import org.apache.ibatis.annotations.Insert;\n");contentBuilder.append("import org.apache.ibatis.annotations.Select;\n");contentBuilder.append("import org.apache.ibatis.annotations.Results;\n");contentBuilder.append("import org.springframework.stereotype.Repository;\n");contentBuilder.append("import org.apache.ibatis.annotations.Update;\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("@Repository(value = \"" + clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + "Mapper\"" + ")\n");contentBuilder.append("public interface " + clazz.getSimpleName() + "Mapper"+"{\n\n");contentBuilder.append("    @Select(value = \"请替换成您需要的sql\")\n");contentBuilder.append("    @Results(value = {})\n");contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll();");contentBuilder.append("\n\n");contentBuilder.append("    @Select(value = \"请替换成您需要的sql\")\n");contentBuilder.append("    @Results(value = {})\n");contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id);");contentBuilder.append("\n\n");contentBuilder.append("    @Insert(\"\")\n");contentBuilder.append("    public void add(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");contentBuilder.append("\n\n");contentBuilder.append("    @Update(\"\")\n");contentBuilder.append("    public void delete(String id);");contentBuilder.append("\n\n");contentBuilder.append("    @Update(\"\")\n");contentBuilder.append("    public void update(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");contentBuilder.append("\n}");println(mapperJavaFile, contentBuilder.toString());}/** * 生成Dao代码 * @param clazz * */public static void generateDao(Class<?> clazz) throws IOException{generateDaoInterface(clazz);generateDaoImplement(clazz);}private static void generateDaoInterface(Class<?> clazz) throws IOException{String path = path(clazz);String daoDirectoryName = path.substring(0, path.lastIndexOf("\\")) + File.separator + "dao";File daoDirectory = new File(daoDirectoryName);if(!daoDirectory.exists()){daoDirectory.mkdir();}String daoJavaFileName = daoDirectory.getCanonicalPath() + File.separator + "I" + clazz.getSimpleName() + "Dao.java";File daoJavaFile = new File(daoJavaFileName);StringBuilder contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".dao;");contentBuilder.append("\n\n");contentBuilder.append("import java.util.*;\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("public interface "+"I" + clazz.getSimpleName() + "Dao"+"{\n\n");contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll();");contentBuilder.append("\n\n");contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id);");contentBuilder.append("\n\n");contentBuilder.append("    public void add(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");contentBuilder.append("\n\n");contentBuilder.append("    public void delete(String id);");contentBuilder.append("\n\n");contentBuilder.append("    public void update(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");contentBuilder.append("\n}");println(daoJavaFile, contentBuilder.toString());}private static void generateDaoImplement(Class<?> clazz) throws IOException {String path = path(clazz);String daoDirectoryName = path.substring(0, path.lastIndexOf("\\")) + File.separator + "dao" + File.separator + "impl";File daoDirectory = new File(daoDirectoryName);if(!daoDirectory.exists()){daoDirectory.mkdir();}String daoJavaFileName = daoDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "DaoImpl.java";File daoJavaFile = new File(daoJavaFileName);StringBuilder contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".dao.impl;");contentBuilder.append("\n\n");contentBuilder.append("import java.util.*;\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".dao.I" + clazz.getSimpleName() + "Dao" + ";\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + "Mapper" + ";\n");contentBuilder.append("import org.springframework.stereotype.Repository;\n");contentBuilder.append("import javax.annotation.Resource;\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("@Repository\n");contentBuilder.append("public class "+ clazz.getSimpleName() + "DaoImpl implements I" + clazz.getSimpleName() + "Dao" +"{\n\n");String mapperName = clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + "Mapper";contentBuilder.append("    @Resource(name = \"" + mapperName + "\")\n");contentBuilder.append("    private " + clazz.getSimpleName() + "Mapper " + mapperName + ";\n\n");contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll(){\n");contentBuilder.append("        return " + mapperName+ ".listAll()" + ";");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id){\n");contentBuilder.append("        return " + mapperName + ".listBy(id)" + ";");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public void add(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + "){\n");contentBuilder.append("        " + mapperName + ".add(" + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + ");" + "");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public void delete(String id){\n");contentBuilder.append("        " + mapperName + ".delete(id);");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public void update(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + "){\n");contentBuilder.append("        " + mapperName + ".update(" + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + ");" + "");contentBuilder.append("\n    }\n");contentBuilder.append("}");println(daoJavaFile, contentBuilder.toString());}/** * 生成Service代码 * @param clazz * */public static void generateService(Class<?> clazz) throws IOException{generateServiceInterface(clazz);generateServiceImplement(clazz);}private static void generateServiceInterface(Class<?> clazz) throws IOException{String path = path(clazz);String serviceDirectoryName = path.substring(0, path.lastIndexOf("\\")) + File.separator + "service";File serviceDirectory = new File(serviceDirectoryName);if(!serviceDirectory.exists()){serviceDirectory.mkdir();}String serviceJavaFileName = serviceDirectory.getCanonicalPath() + File.separator + "I" + clazz.getSimpleName() + "Service.java";File serviceJavaFile = new File(serviceJavaFileName);StringBuilder contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".service;");contentBuilder.append("\n\n");contentBuilder.append("import java.util.*;\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("public interface "+"I" + clazz.getSimpleName() + "Service"+"{\n\n");contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll();");contentBuilder.append("\n\n");contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id);");contentBuilder.append("\n\n");contentBuilder.append("    public void add(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");contentBuilder.append("\n\n");contentBuilder.append("    public void delete(String id);");contentBuilder.append("\n\n");contentBuilder.append("    public void update(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");contentBuilder.append("\n}");println(serviceJavaFile, contentBuilder.toString());}private static void generateServiceImplement(Class<?> clazz) throws IOException {String path = path(clazz);String serviceDirectoryName = path.substring(0, path.lastIndexOf("\\")) + File.separator + "service" + File.separator + "impl";File serviceDirectory = new File(serviceDirectoryName);if(!serviceDirectory.exists()){serviceDirectory.mkdir();}String serviceJavaFileName = serviceDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "ServiceImpl.java";File daoJavaFile = new File(serviceJavaFileName);StringBuilder contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".service.impl;");contentBuilder.append("\n\n");contentBuilder.append("import java.util.*;\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName()+ "Service" + ";\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".dao.I" + clazz.getSimpleName()+ "Dao" + ";\n");contentBuilder.append("import org.springframework.stereotype.Service;\n");contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;\n");contentBuilder.append("\n\n");contentBuilder.append("@Service\n");contentBuilder.append("public class "+ clazz.getSimpleName() + "ServiceImpl implements I" + clazz.getSimpleName() + "Service" + "{\n\n");String daoName = clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + "Dao";contentBuilder.append("    @Autowired\n");contentBuilder.append("    private I" + clazz.getSimpleName() + "Dao " + daoName + ";\n\n");contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll(){\n");contentBuilder.append("        return " + daoName + ".listAll()" + ";");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id){\n");contentBuilder.append("        return " + daoName + ".listBy(id)" + ";");contentBuilder.append("\n    }\n\n");String arg = clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1);contentBuilder.append("    public void add(" + clazz.getSimpleName() + " " + arg + "){\n");contentBuilder.append("        " + daoName + ".add(" + arg + ");");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public void delete(String id){\n");contentBuilder.append("       "+daoName +".delete(id);");contentBuilder.append("\n    }\n\n");contentBuilder.append("    public void update(" + clazz.getSimpleName() + " " + arg + "){\n");contentBuilder.append("        "+daoName+".update(" + arg + ");");contentBuilder.append("\n    }\n");contentBuilder.append("}");println(daoJavaFile, contentBuilder.toString());}/** * 生成controller代码 * @param clazz * */public static void generateController(Class<?> clazz) throws IOException{String path = path(clazz);String controllerDirectoryName = path.substring(0, path.lastIndexOf("\\")) + File.separator + "controller";File controllerDirectory = new File(controllerDirectoryName);if(!controllerDirectory.exists()){controllerDirectory.mkdir();}//generate add controllerString controllerJavaFileName = controllerDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "AddController.java";File controllerJavaFile = new File(controllerJavaFileName);StringBuilder contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".controller;");contentBuilder.append("\n\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;\n");contentBuilder.append("import javax.servlet.http.HttpServletRequest;\n");contentBuilder.append("import javax.servlet.http.HttpServletResponse;\n");contentBuilder.append("import org.springframework.stereotype.Controller;");contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;\n");contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("@Controller\n");contentBuilder.append("public class "+ clazz.getSimpleName() + "AddController"+"{\n\n");String serviceName = clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + "Service";contentBuilder.append("    @Autowired\n");contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/add.do\")\n");contentBuilder.append("    public String add(HttpServletRequest req){\n");contentBuilder.append("        return \"" + clazz.getSimpleName().toLowerCase() + "/add\";\n");contentBuilder.append("    }\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/addSubmit.do\")\n");contentBuilder.append("    public void addSubmit(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + ", HttpServletRequest req, HttpServletResponse resp){\n");contentBuilder.append("    }\n");contentBuilder.append("\n}");println(controllerJavaFile, contentBuilder.toString());//clear content builder;contentBuilder = new StringBuilder();//generate delete controllercontrollerJavaFileName = controllerDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "DeleteController.java";controllerJavaFile = new File(controllerJavaFileName);contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".controller;");contentBuilder.append("\n\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;\n");contentBuilder.append("import javax.servlet.http.HttpServletRequest;\n");contentBuilder.append("import javax.servlet.http.HttpServletResponse;\n");contentBuilder.append("import org.springframework.stereotype.Controller;");contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;\n");contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("@Controller\n");contentBuilder.append("public class "+ clazz.getSimpleName() + "DeleteController"+"{\n\n");contentBuilder.append("    @Autowired\n");contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/delete.do\")\n");contentBuilder.append("    public void delete(HttpServletResponse resp){\n");contentBuilder.append("    }\n\n");contentBuilder.append("\n}");println(controllerJavaFile, contentBuilder.toString());//clear content builder;contentBuilder = new StringBuilder();//generate update controllercontrollerJavaFileName = controllerDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "UpdateController.java";controllerJavaFile = new File(controllerJavaFileName);contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".controller;");contentBuilder.append("\n\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;\n");contentBuilder.append("import javax.servlet.http.HttpServletRequest;\n");contentBuilder.append("import javax.servlet.http.HttpServletResponse;\n");contentBuilder.append("import org.springframework.stereotype.Controller;");contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;\n");contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("@Controller\n");contentBuilder.append("public class "+ clazz.getSimpleName() + "UpdateController"+"{\n\n");contentBuilder.append("    @Autowired\n");contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/update.do\")\n");contentBuilder.append("    public String update(HttpServletRequest req){\n");contentBuilder.append("        return \"" + clazz.getSimpleName().toLowerCase() + "/update\";\n");contentBuilder.append("    }\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/updateSubmit.do\")\n");contentBuilder.append("    public void updateSubmit(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + ", HttpServletRequest req, HttpServletResponse resp){\n");contentBuilder.append("    }\n");contentBuilder.append("\n}");println(controllerJavaFile, contentBuilder.toString());//clear content builder;contentBuilder = new StringBuilder();//generate list controllercontrollerJavaFileName = controllerDirectory.getCanonicalPath() + File.separator + clazz.getSimpleName() + "ListController.java";controllerJavaFile = new File(controllerJavaFileName);contentBuilder = new StringBuilder();contentBuilder.append("package net.itaem." + clazz.getSimpleName().toLowerCase() + ".controller;");contentBuilder.append("\n\n");contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";\n");contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;\n");contentBuilder.append("import javax.servlet.http.HttpServletRequest;\n");contentBuilder.append("import javax.servlet.http.HttpServletResponse;\n");contentBuilder.append("import org.springframework.stereotype.Controller;");contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;\n");contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;\n");contentBuilder.append("\n\n");contentBuilder.append("");contentBuilder.append("@Controller\n");contentBuilder.append("public class "+ clazz.getSimpleName() + "ListController"+"{\n\n");contentBuilder.append("    @Autowired\n");contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/list.do\")\n");contentBuilder.append("    public String list(HttpServletRequest req){\n");contentBuilder.append("        return \"" + clazz.getSimpleName().toLowerCase() + "/list\";\n");contentBuilder.append("    }\n\n");contentBuilder.append("    @RequestMapping(\"/" + clazz.getSimpleName().toLowerCase() + "/listJson.do\")\n");contentBuilder.append("    public void listJson(HttpServletResponse resp){\n");contentBuilder.append("    }\n\n");contentBuilder.append("\n}");println(controllerJavaFile, contentBuilder.toString());}/** * 生成jsp界面，这里面一共有三个jsp，分别是add.jsp, update.jsp, list.jsp * */public static void generateJsp(Class<?> clazz) throws IOException{File directory = new File("");// 参数为空String courseFile = directory.getCanonicalPath();String jspRoot = courseFile + File.separator + "WebContent" + File.separator + "WEB-INF" + File.separator + "jsp";String newJspPath = jspRoot + File.separator + clazz.getSimpleName().toLowerCase();File newJspDirectory = new File(newJspPath);if(!newJspDirectory.exists()){newJspDirectory.mkdir();}String patternPath = jspRoot + File.separator + "pattern";//将pattern下面的模板jsp文件复制到这个新建立的文件夹中copyJsp(patternPath, newJspPath);}/** * copy置顶文件夹下面的文件夹到新文件夹中 * @param src * @param dest * */private static void copyJsp(String src, String dest){File srcFile = new File(src);if(srcFile.exists()){File[] files = srcFile.listFiles();for(File from: files){try {   String to = dest + File.separator + from.getName();File toFile = new File(to);//如果该文件存在，不要进行复制if(toFile.exists()){continue;}InputStream in = new FileInputStream(from);   OutputStream out = new FileOutputStream(to);   byte[] buff = new byte[1024];   int len = 0;   while ((len = in.read(buff)) != -1) {   out.write(buff, 0, len);   }   in.close();   out.close();   } catch (FileNotFoundException e) {   e.printStackTrace();   } catch (IOException e) {   e.printStackTrace();   }   }}}/** * 获取该类的文件夹所在位置 * @param clazz  * @return 获取该类的文件夹所在位置  * */public static String path(Class<?> clazz) throws IOException{File directory = new File("");// 参数为空String courseFile = directory.getCanonicalPath();String packageName = clazz.getPackage().getName();String newPackageName = courseFile + File.separator + "src" + File.separator + packageName.replace(".", File.separator);return newPackageName;}public static void println(File file, String content){PrintWriter writer = null;try {writer = new PrintWriter(file);writer.write(content);} catch (FileNotFoundException e) {e.printStackTrace();}finally{writer.close();}}}</span>

        

        下面我们观察下生成代码的样式。这里面给出一个实体Department，生成了如下图所示的代码以及jsp文件。

        下面是生成后的代码样式，这里面生成的代码木有注释，如果大家觉得有必要，可以自己添加相关注释。

package net.itaem.department.controller;import net.itaem.department.entity.Department;import net.itaem.department.service.IDepartmentService;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;@Controllerpublic class DepartmentAddController{    @Autowired    private IDepartmentService departmentService;    @RequestMapping("/department/add.do")    public String add(HttpServletRequest req){        return "department/add";    }    @RequestMapping("/department/addSubmit.do")    public void addSubmit(Department department, HttpServletRequest req, HttpServletResponse resp){    }}

package net.itaem.department.service;import java.util.*;import net.itaem.department.entity.Department;public interface IDepartmentService{    public List<Department> listAll();    public Department listBy(String id);    public void add(Department Department);    public void delete(String id);    public void update(Department Department);}

package net.itaem.department.dao;import java.util.*;import net.itaem.department.entity.Department;public interface IDepartmentDao{    public List<Department> listAll();    public Department listBy(String id);    public void add(Department Department);    public void delete(String id);    public void update(Department Department);}

package net.itaem.department.entity;import java.util.*;import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Select;import org.apache.ibatis.annotations.Results;import org.springframework.stereotype.Repository;import org.apache.ibatis.annotations.Update;@Repository(value = "departmentMapper")public interface DepartmentMapper{    @Select(value = "请替换成您需要的sql")    @Results(value = {})    public List<Department> listAll();    @Select(value = "请替换成您需要的sql")    @Results(value = {})    public Department listBy(String id);    @Insert("")    public void add(Department Department);    @Update("")    public void delete(String id);    @Update("")    public void update(Department Department);}

总结：开发一个代码生成器的难度并不大，关键在于工程的组织能够方便代码生成器生成代码。