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代码生成，大大简化您的工作

在web发展。模块化开发是普遍。在最近的毕业设计，基于自身spring mvc + mybatics + liger ui开发了一个站点，里面也使用模块化来组织代码。于是每个模块的操作，基本上都是大同小异，无非就是增删改查。

以下先观察下代码的包组织结构，以及jsp文件组织结构：例如以下图所看到的。

从图中能够看出。一个模块通常情况下也会有一个对应的jsp目录。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，我们通常在模块以下又使用dao层，service层。controller层，entity层来组织代码。当中dao层用于訪问数据库。service层属于dao层的门面设计模式，通常能够依据业务逻辑须要，调用多个dao层来完毕任务。controller层则是controller类。通常由Add、delete、update、list四个controller类，每一个类仅仅有一个核心功能；entity层则是实体类。在这个project里面，将mybatics的mapper类放在这里。

以下我们来查看下一个模块的代码组织。例如以下图所看到的。

从图中能够看出，代码命名规则非常的明白。这样子的命名规则，能够非常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，则程序自己主动生成controller、dao、service、mapper、jsp等模板文件。

开发人员仅仅须要依据业务逻辑须要，将sql放入到mapper中，就能高速完毕新模块功能的开发。

类的开发比較简单，主要就是得到project所在路径，依据给出entity实体，自己主动生成dao、service、controller、mapper、jsp等文件。因为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;

/**
 * 自己主动代码生成器
 * 1、代码生成器须要做的功能：
 * 给出Entity，生成Mybatics Mapper，生成成Dao层。service层，以及controller层，以及jsp文件
 * 
 * 生成的这些文件里。所有都是骨架代码，开发时须要依据详细要求加入业务逻辑代码就可以
 * @author luohong 846705189@qq.com 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("

");
		contentBuilder.append("import java.util.*;
");
		contentBuilder.append("import org.apache.ibatis.annotations.Insert;
");
		contentBuilder.append("import org.apache.ibatis.annotations.Select;
");
		contentBuilder.append("import org.apache.ibatis.annotations.Results;
");
		contentBuilder.append("import org.springframework.stereotype.Repository;
");
		contentBuilder.append("import org.apache.ibatis.annotations.Update;
");
		contentBuilder.append("

");
		contentBuilder.append("");

		contentBuilder.append("@Repository(value = "" + clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + "Mapper"" + ")
");
		contentBuilder.append("public interface " + clazz.getSimpleName() + "Mapper"+"{

");
		contentBuilder.append("    @Select(value = "请替换成您须要的sql")
");
		contentBuilder.append("    @Results(value = {})
");
		contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll();");
		contentBuilder.append("

");

		contentBuilder.append("    @Select(value = "请替换成您须要的sql")
");
		contentBuilder.append("    @Results(value = {})
");
		contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id);");
		contentBuilder.append("

");

		contentBuilder.append("    @Insert("")
");
		contentBuilder.append("    public void add(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");
		contentBuilder.append("

");

		contentBuilder.append("    @Update("")
");
		contentBuilder.append("    public void delete(String id);");
		contentBuilder.append("

");

		contentBuilder.append("    @Update("")
");
		contentBuilder.append("    public void update(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");
		contentBuilder.append("
}");
		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("

");
		contentBuilder.append("import java.util.*;
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("

");
		contentBuilder.append("");
		contentBuilder.append("public interface "+"I" + clazz.getSimpleName() + "Dao"+"{

");
		contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll();");
		contentBuilder.append("

");
		contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id);");
		contentBuilder.append("

");
		contentBuilder.append("    public void add(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");
		contentBuilder.append("

");
		contentBuilder.append("    public void delete(String id);");
		contentBuilder.append("

");
		contentBuilder.append("    public void update(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");
		contentBuilder.append("
}");
		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("

");
		contentBuilder.append("import java.util.*;
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".dao.I" + clazz.getSimpleName() + "Dao" + ";
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + "Mapper" + ";
");

		contentBuilder.append("import org.springframework.stereotype.Repository;
");
		contentBuilder.append("import javax.annotation.Resource;
");

		contentBuilder.append("

");
		contentBuilder.append("");

		contentBuilder.append("@Repository
");
		contentBuilder.append("public class "+ clazz.getSimpleName() + "DaoImpl implements I" + clazz.getSimpleName() + "Dao" +"{

");

		String mapperName = clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + "Mapper";
		contentBuilder.append("    @Resource(name = "" + mapperName + "")
");
		contentBuilder.append("    private " + clazz.getSimpleName() + "Mapper " + mapperName + ";

");
		contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll(){
");
		contentBuilder.append("        return " + mapperName+ ".listAll()" + ";");
		contentBuilder.append("
    }

");

		contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id){
");
		contentBuilder.append("        return " + mapperName + ".listBy(id)" + ";");
		contentBuilder.append("
    }

");

		contentBuilder.append("    public void add(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + "){
");
		contentBuilder.append("        " + mapperName + ".add(" + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + ");" + "");
		contentBuilder.append("
    }

");

		contentBuilder.append("    public void delete(String id){
");
		contentBuilder.append("        " + mapperName + ".delete(id);");
		contentBuilder.append("
    }

");

		contentBuilder.append("    public void update(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + "){
");
		contentBuilder.append("        " + mapperName + ".update(" + clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + ");" + "");
		contentBuilder.append("
    }
");
		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("

");
		contentBuilder.append("import java.util.*;
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("

");
		contentBuilder.append("");
		contentBuilder.append("public interface "+"I" + clazz.getSimpleName() + "Service"+"{

");
		contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll();");
		contentBuilder.append("

");
		contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id);");
		contentBuilder.append("

");
		contentBuilder.append("    public void add(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");
		contentBuilder.append("

");
		contentBuilder.append("    public void delete(String id);");
		contentBuilder.append("

");
		contentBuilder.append("    public void update(" + clazz.getSimpleName().substring(0,1).toUpperCase() + clazz.getSimpleName().substring(1) + " " + clazz.getSimpleName() + ");");
		contentBuilder.append("
}");
		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("

");
		contentBuilder.append("import java.util.*;
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName()+ "Service" + ";
");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".dao.I" + clazz.getSimpleName()+ "Dao" + ";
");
		contentBuilder.append("import org.springframework.stereotype.Service;
");
		contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;
");
		contentBuilder.append("

");

		contentBuilder.append("@Service
");
		contentBuilder.append("public class "+ clazz.getSimpleName() + "ServiceImpl implements I" + clazz.getSimpleName() + "Service" + "{

");
		String daoName = clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1) + "Dao";
		contentBuilder.append("    @Autowired
");
		contentBuilder.append("    private I" + clazz.getSimpleName() + "Dao " + daoName + ";

");

		contentBuilder.append("    public List<"+clazz.getSimpleName()+"> listAll(){
");
		contentBuilder.append("        return " + daoName + ".listAll()" + ";");
		contentBuilder.append("
    }

");

		contentBuilder.append("    public "+clazz.getSimpleName()+" listBy(String id){
");
		contentBuilder.append("        return " + daoName + ".listBy(id)" + ";");
		contentBuilder.append("
    }

");

		String arg = clazz.getSimpleName().substring(0,1).toLowerCase() + clazz.getSimpleName().substring(1);
		contentBuilder.append("    public void add(" + clazz.getSimpleName() + " " + arg + "){
");
		contentBuilder.append("        " + daoName + ".add(" + arg + ");");
		contentBuilder.append("
    }

");
		contentBuilder.append("    public void delete(String id){
");
		contentBuilder.append("       "+daoName +".delete(id);");
		contentBuilder.append("
    }

");
		contentBuilder.append("    public void update(" + clazz.getSimpleName() + " " + arg + "){
");
		contentBuilder.append("        "+daoName+".update(" + arg + ");");
		contentBuilder.append("
    }
");
		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 controller
		String 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("

");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;
");
		contentBuilder.append("import javax.servlet.http.HttpServletRequest;
");
		contentBuilder.append("import javax.servlet.http.HttpServletResponse;
");
		contentBuilder.append("import org.springframework.stereotype.Controller;");
		contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;
");
		contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;
");

		contentBuilder.append("

");
		contentBuilder.append("");
		contentBuilder.append("@Controller
");
		contentBuilder.append("public class "+ clazz.getSimpleName() + "AddController"+"{

");
		String serviceName = clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + "Service";
		contentBuilder.append("    @Autowired
");
		contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/add.do")
");
		contentBuilder.append("    public String add(HttpServletRequest req){
");
		contentBuilder.append("        return "" + clazz.getSimpleName().toLowerCase() + "/add";
");
		contentBuilder.append("    }

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/addSubmit.do")
");
		contentBuilder.append("    public void addSubmit(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + ", HttpServletRequest req, HttpServletResponse resp){
");
		contentBuilder.append("    }
");

		contentBuilder.append("
}");
		println(controllerJavaFile, contentBuilder.toString());

		//clear content builder;
		contentBuilder = new StringBuilder();

		//generate delete controller
		controllerJavaFileName = 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("

");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;
");
		contentBuilder.append("import javax.servlet.http.HttpServletRequest;
");
		contentBuilder.append("import javax.servlet.http.HttpServletResponse;
");
		contentBuilder.append("import org.springframework.stereotype.Controller;");
		contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;
");
		contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;
");

		contentBuilder.append("

");
		contentBuilder.append("");
		contentBuilder.append("@Controller
");
		contentBuilder.append("public class "+ clazz.getSimpleName() + "DeleteController"+"{

");
		contentBuilder.append("    @Autowired
");
		contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/delete.do")
");
		contentBuilder.append("    public void delete(HttpServletResponse resp){
");
		contentBuilder.append("    }

");

		contentBuilder.append("
}");
		println(controllerJavaFile, contentBuilder.toString());

		//clear content builder;
		contentBuilder = new StringBuilder();

		//generate update controller
		controllerJavaFileName = 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("

");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;
");
		contentBuilder.append("import javax.servlet.http.HttpServletRequest;
");
		contentBuilder.append("import javax.servlet.http.HttpServletResponse;
");
		contentBuilder.append("import org.springframework.stereotype.Controller;");
		contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;
");
		contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;
");

		contentBuilder.append("

");
		contentBuilder.append("");
		contentBuilder.append("@Controller
");
		contentBuilder.append("public class "+ clazz.getSimpleName() + "UpdateController"+"{

");
		contentBuilder.append("    @Autowired
");
		contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/update.do")
");
		contentBuilder.append("    public String update(HttpServletRequest req){
");
		contentBuilder.append("        return "" + clazz.getSimpleName().toLowerCase() + "/update";
");
		contentBuilder.append("    }

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/updateSubmit.do")
");
		contentBuilder.append("    public void updateSubmit(" + clazz.getSimpleName() + " " + clazz.getSimpleName().substring(0, 1).toLowerCase() + clazz.getSimpleName().substring(1) + ", HttpServletRequest req, HttpServletResponse resp){
");
		contentBuilder.append("    }
");

		contentBuilder.append("
}");
		println(controllerJavaFile, contentBuilder.toString());

		//clear content builder;
		contentBuilder = new StringBuilder();

		//generate list controller
		controllerJavaFileName = 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("

");
		contentBuilder.append("import net.itaem." + clazz.getSimpleName().toLowerCase() + ".entity." + clazz.getSimpleName() + ";
");
		contentBuilder.append("import net.itaem."+ clazz.getSimpleName().toLowerCase() + ".service.I" + clazz.getSimpleName() + "Service;
");
		contentBuilder.append("import javax.servlet.http.HttpServletRequest;
");
		contentBuilder.append("import javax.servlet.http.HttpServletResponse;
");
		contentBuilder.append("import org.springframework.stereotype.Controller;");
		contentBuilder.append("import org.springframework.beans.factory.annotation.Autowired;
");
		contentBuilder.append("import org.springframework.web.bind.annotation.RequestMapping;
");
		contentBuilder.append("

");
		contentBuilder.append("");
		contentBuilder.append("@Controller
");
		contentBuilder.append("public class "+ clazz.getSimpleName() + "ListController"+"{

");
		contentBuilder.append("    @Autowired
");
		contentBuilder.append("    private I" + clazz.getSimpleName() + "Service " + serviceName + ";

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/list.do")
");
		contentBuilder.append("    public String list(HttpServletRequest req){
");
		contentBuilder.append("        return "" + clazz.getSimpleName().toLowerCase() + "/list";
");
		contentBuilder.append("    }

");

		contentBuilder.append("    @RequestMapping("/" + clazz.getSimpleName().toLowerCase() + "/listJson.do")
");
		contentBuilder.append("    public void listJson(HttpServletResponse resp){
");
		contentBuilder.append("    }

");

		contentBuilder.append("
}");
		println(controllerJavaFile, contentBuilder.toString());
	}

	/**
	 * 生成jsp界面，这里面一共同拥有三个jsp。各自是add.jsp, update.jsp, list.jsp
	 * */
	public static void generateJsp(Class<?
> clazz) throws IOException{
		File directory = new File("");// 參数为空
		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以下的模板jsp文件拷贝到这个新建立的目录中
		copyJsp(patternPath, newJspPath);
	}

	/**
	 * copy置顶目录以下的目录到新目录中
	 * @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);
					//假设该文件存在。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();   
				}   
			}
		}
	}
	/**
	 * 获取该类的目录所在位置
	 * @param clazz 
	 * @return 获取该类的目录所在位置 
	 * */
	public static String path(Class<?> clazz) throws IOException{
		File directory = new File("");// 參数为空
		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>

以下我们观察下生成代码的样式。这里面给出一个实体Department，生成了例如以下图所看到的的代码以及jsp文件。

以下是生成后的代码样式，这里面生成的代码木有凝视，假设大家认为有必要，能够自己加入相关凝视。

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;


@Controller
public 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 = "请替换成您须要的sql")
    @Results(value = {})
    public List<Department> listAll();

    @Select(value = "请替换成您须要的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project的组织可以方便代码生成器生成代码。

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原文地址：https://www.cnblogs.com/mfrbuaa/p/4739636.html