代码生成，大大简化您的工作

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

contentBuilder.append("    @Select(value = \"请替换成您须要的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 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("\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 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("\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 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("\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 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("\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。