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//在开发过程中比如创建controller（控制层）我们避免不了的重复创建接口捕获异常为接口注释，这些虽然在编译器可以生成，但是总是不那么自由，尤其不符合个人习惯，因此我自己定义了一套，可以指定地址，指定名称，可以创建单个，也可以一次都创建，完全是为了自己的开发需要：

这个要额外的一个jar包mysql-connector-java-5.1.34.jar，因为在创建pojo类时，我是直接通过访问数据的dll文件读出表的数据结构的。

import java.io.File;import java.io.FileOutputStream;import java.io.PrintWriter;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.sql.*;/** * Created by ChaoZhang on 2019-03-14 10:55 */public class create {    /**     * @type     * all     * domain     * service     * serviceImpl     * ctrl     * mapper     * mapper.xml     */    public static String type = "all";   //创建类型    public static final String path = "E:\\CreateDomainServiceMapper\\src\\";   //创建路径及内容    public static final String fileName = "SpaceAvShare";  //创建的文件的名字    public static final String owner = "ChaoZhang";     //注释作者    public static final Date date = new Date();     //创建时间    static class classBuffer{        public File file;        public StringBuffer buffer;        classBuffer(File file, StringBuffer buffer){            this.file = file;            this.buffer = buffer;        }    }    /**     * 自定义创建作者和注释加入到缓冲并返回     * example     * created by ChaoZhang onThu Mar 14 14:05:05 CST 2019     */    public static StringBuffer writeOwner(){        StringBuffer buffer = new StringBuffer();        buffer.append("/**\r\n");        buffer.append(" *created by " + owner + " on " + date + "\r\n");        buffer.append(" */\r\n");        buffer.append("\r\n");        return buffer;    }    /**     * 自定义创建class或者interface加入到缓冲并返回     * @return     * @throws Exception     */    public static StringBuffer writeClassOrInterface(StringBuffer buffer) throws Exception{        if(type.equals(new String("domain"))){            buffer.append("public class " + fileName + " {" + "\r\n");            JdbcConnection jdbcConnection = new JdbcConnection();            System.out.println("*** writeClassOrInterface " + JdbcConnection.result.toString());            buffer.append(JdbcConnection.result.toString());        }else if(type.equals(new String("service"))){            buffer.append("public interface " + fileName + "Service" + " {");        }else if(type.equals(new String("ctrl"))){            buffer.append("@Controller\r\n");            buffer.append("@RequestMapping(value = \"\")\n");            buffer.append("public class " + fileName + "Ctrl" + " {");            buffer.append("\r\n\r\n");            buffer.append("/*JSONObject jsonObject = new JSONObject();\n" +                    "    Integer state = Integer.valueOf(1000);\n" +                    "        try{\n" +                    "\n" +                    "    }catch (Exception e){\n" +                    "        e.printStackTrace();\n" +                    "        jsonObject.put(\"msg\", \"sql报错\");\n" +                    "        jsonObject.put(\"erro\", e.getCause());\n" +                    "        state = Integer.valueOf(2000);\n" +                    "    }\n" +                    "        jsonObject.put(\"state\", state);\n" +                    "        return jsonObject;*/");        }else if(type.equals(new String("serviceImpl"))){            buffer.append("@Service\r\n");            buffer.append("public class " + fileName + "ServiceImpl " + "implements " + fileName + "Service" + " {");        }else if(type.equals(new String("mapper"))){            buffer.append("public interface " + fileName + "Mapper" + " {");        }        if(type.equals(new String("xml"))){            buffer.append("
   \r\n");            buffer.append("\r\n");            buffer.append("
   
    \r\n");            buffer.append("\r\n\r\n");            buffer.append("
   \r\n");            return buffer;        }        buffer.append("\r\n");        buffer.append("\r\n");        buffer.append("}");        return buffer;    }    /**     * 创建pojo类     * domain文件夹     */    public static classBuffer createDomain(){        File file = new File(path + fileName + ".java");        //写文件注释和创建者        StringBuffer buffer = writeOwner();        classBuffer classBuffer = new classBuffer(file, buffer);        return classBuffer;    }    /**     * 创建业务service     * service文件夹     */    public static classBuffer createService(){        File file = new File(path + fileName + "Service" +".java");        //写文件注释和创建者        StringBuffer buffer = writeOwner();        classBuffer classBuffer = new classBuffer(file, buffer);        return classBuffer;    }    /**     * 创建Dao层服务     * mapper文件夹     */    public static classBuffer createMapper(){        File file = new File(path + fileName + "Mapper" + ".java");        //写文件注释和创建者        StringBuffer buffer = writeOwner();        classBuffer classBuffer = new classBuffer(file, buffer);        return classBuffer;    }    /**     * 创建业务实现类     * impl文件夹     */    public static classBuffer createserviceImpl(){        File file = new File(path + fileName + "ServiceImpl" + ".java");        //写文件注释和创建者        StringBuffer buffer = writeOwner();        classBuffer classBuffer = new classBuffer(file, buffer);        return classBuffer;    }    /**     * 创建控制层实现类     * controller文件夹     */    public static classBuffer createCtrl(){        File file = new File(path + fileName + "Ctrl" + ".java");        //写文件注释和创建者        StringBuffer buffer = writeOwner();        classBuffer classBuffer = new classBuffer(file, buffer);        return classBuffer;    }    /**     * 创建.xml文件     * @throws Exception     */    public static classBuffer createXml(){        File file = new File(path + fileName + "Mapper" + ".xml");        //写文件注释和创建者        StringBuffer buffer = writeOwner();        classBuffer classBuffer = new classBuffer(file, buffer);        return classBuffer;    }    public static void create() throws Exception{        classBuffer classBuffer = null;        switch (type){            case "domain":                classBuffer = createDomain();                break;            case "service":                classBuffer = createService();                break;            case "serviceImpl":                classBuffer = createserviceImpl();                break;            case "ctrl":                classBuffer = createCtrl();                break;            case "mapper":                classBuffer = createMapper();                break;            case "xml":                classBuffer = createXml();                break;            default:                System.out.println("未知类型");        }        if(classBuffer.file.exists()){            System.out.println("*** 该" + type + "文件已经存在 ***");            return ;        }else{            classBuffer.file.createNewFile();   //创建文件            //创建class or interface            StringBuffer buffer1 = writeClassOrInterface(classBuffer.buffer);            FileOutputStream fs = new FileOutputStream(classBuffer.file);   //创建输出流输出到文件            PrintWriter pw = new PrintWriter(fs);   //创建打印对象将字符写入输出流            pw.write(buffer1.toString());    //将字符写入输出流            pw.flush();     //强制将缓冲全部输出到指定文件            pw.close();        }    }    //定义一个连接类    static class JdbcConnection    {        //创建一个用于连接的对象        Connection ct = null;        //创建一个用于发送sql语句的对象        PreparedStatement ps = null;        //创建一个用于接收结果集的对象        ResultSet rs = null;        //属性        public static StringBuffer result = new StringBuffer("");        //默认构造函数        public JdbcConnection()        {            try {                //加载驱动                Class.forName("org.gjt.mm.mysql.Driver");                //得到连接                ct = DriverManager.getConnection                        ("jdbc:mysql://114.112.92.135:3307/space?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=utf8","songod", "6Kx2n9usEP96K" );                //查询                String str = "SELECT COLUMN_NAME name , COLUMN_TYPE type, COLUMN_COMMENT comment FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = 'space' AND TABLE_NAME = 'space_av';";                ps = ct.prepareStatement(str);                //得到结果                rs = ps.executeQuery();                String s = null;                while(rs.next()){                    s = "private " + rs.getString(2) + " " + rs.getString(1) + ";" + "   //" + rs.getString(3);                    System.out.println("private " + rs.getString(2) + " " + rs.getString(1) + ";" + "   //" + rs.getString(3));                    this.result.append("\r\n");                    this.result.append("\r\n");                    this.result.append("    ");                    this.result.append(s);                    this.result.append("\r\n");                }            } catch (Exception e) {                // TODO: handle exception                e.printStackTrace();            }finally            {                try {                    //关闭资源                    if(rs != null)                    {                        rs.close();                    }                    if(ps != null)                    {                        ps.close();                    }                    if(ct != null)                    {                        ct.close();                    }                } catch (Exception e2) {                    // TODO: handle exception                    e2.printStackTrace();                }            }        }    }    public static void main(String[] args) throws Exception{        /**         * 创建         */        System.out.println("*** 开始创建 ***");        List
   
     list = new ArrayList
    
     ();        if(type.equals("all")){            list.add("domain");            list.add("service");            list.add("ctrl");            list.add("mapper");            list.add("serviceImpl");            list.add("xml");        }else{            create();        }        for(String s:list){            type = s;            create();        }        System.out.println("*** 创建完成 ***");    }}
    
   

比如我要创建的叫SpaceAvShare那么如下图：

从pojo类，ctrl，mapper，service都创建好了，这里要提一下创建pojo类需要连接数据库的连接，我将数据库的某个表的dll文件读出创建pojo类

很简单，完全符合我自己的习惯

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