Reverse entity classes generated SQL database tables

com.xq.tmall.util Package; 

Import org.slf4j.Logger; 
Import org.slf4j.LoggerFactory; 

Import java.io.File; 
Import java.io.FileOutputStream; 
Import as java.lang.reflect.Field; 
Import Classes in java.util .ArrayList; 
Import java.util.List; 

public class SqlGenerator { 
   Private static Logger Logger = Final LoggerFactory.getLogger (SqlGenerator.class); 
   
   {public static void main (String [] args) 
      // package on the disk where the entity class absolute path 
      String packageName = "E: / the Java / resourcesproject / Micro / 925 / Tmall_demo / src / main / the Java / COM / XQ / Tmall / the Entity"; 
      // generate sql folders 
      String filePath = "E: / create / "; 
      path item entity class // 
      String prefix =" com.xq.tmall.entity ".;
      ClassName = String ""; 

      the StringBuffer sqls the StringBuffer new new = (); 
      // get all the class name in the package 
      List <String> List = getAllClasses (the packageName); 
      for (STR String: List) { 
         className = prefix + str.substring ( 0, str.lastIndexOf ( ".")); 
         String SQL = generateSql (className, filePath); 
         sqls.append (SQL); 
      } 
      System.out.println (sqls.toString ()); 
      StringToSql (sqls.toString () , filePath + "report.sql"); 

   } 
   / ** 
    * built according to the entity classes generated table statement 
    * @author   
    * @date 2018 Nian 4 Yue 11 Ri 
    * @param className full class name   
    * @param filePath disk path such as: d : / Workspace / 
    * /
   public static String generateSql(String className,String filePath){
      try {
         Class<?> clz = Class.forName(className);
         className = clz.getSimpleName();
         Field[] fields = clz.getDeclaredFields();
         StringBuffer column = new StringBuffer();
         String varchar = " varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,";
         for (Field f : fields) {
            column.append(" \n `"+f.getName()+"`").append(varchar);
         }
         StringBuffer sql = new StringBuffer();
         sql.append("\n DROP TABLE IF EXISTS `"+className+"`; ")
            .append(" \n CREATE TABLE `"+className+"`  (")
            .append ( "\ n-id`` int (. 11) the AUTO_INCREMENT the NOT NULL, ") 
            .append (" \ n-"+ column) 
            .append (" \ n-a PRIMARY KEY ( `id`) the USING BTREE,") 
            .append ( "\ n-id` the INDEX` ( `id`) BTREE the USING") 
            .append ( "\ n-). 1 the InnoDB the CHARACTER the SET ENGINE = = = UTF8 the COLLATE utf8_general_ci the AUTO_INCREMENT =;"); 
         return sql.toString (); 
      } the catch ( E a ClassNotFoundException) { 
         logger.debug ( "class not found!"); 
         return null; 
      } 
      
   } 
   
   / ** 
    * Get the name of all the classes in the package, similar to the results obtained xxx.java 
    * @author   
    * 2018 years @date April 11 
    * @param packageName 
    * @return 
    * /
   public static List<String> getAllClasses(String packageName){
      List<String> classList = new ArrayList<String>();
      String className="";
      File f = new File(packageName);
      if(f.exists() && f.isDirectory()){
         File[] files = f.listFiles();
         for (File file : files) {
             className = file.getName();
             classList.add(className);
         }
         return classList;
      }else{
         logger.debug("包路径未找到！");
         return null;
      }
   }
   /**
    * 将string 写入sql文件
    * @author  
    * @date   2018年4月11日
    * @param str
    @Param path * 
    * / 
   public static void StringToSql (STR String, String path) { 
      byte [] = sourceByte str.getBytes ();   
      IF (null = sourceByte!) {   
          The try {   
              File File = new new File (path); // file path (path + filename)   
              (! File.Exists ()) {// IF the file does not exist, create a file, create a directory   
                  file dir = new new file (file.getParent ());   
                  dir.mkdirs ();   
                  file .createNewFile ();   
              }   
              a FileOutputStream the outStream new new = a FileOutputStream (file); // file output stream for writing data to files 
              outStream.write (sourceByte);   
              outStream.flush (); 
              outStream.close (); // close file output flow  
              System.out.println ( "successful generation"); 
          } the catch (Exception E) {   
             e.printStackTrace (); 
          }   
      }   
   } 
}