从数据库中读取一个图片并保存为一个图片文件

import java.sql.*;import java.io.*;

public class WriteDB {        public static void main(String[] args)  {        Connection conn=null;        String driver="com.mysql.jdbc.Driver";//驱动        String url="jdbc:mysql://127.0.0.1/test?useUnicode=true;characterEncoding=8859_1";// 数据库联接 

        try{               Class.forName(driver).newInstance();               conn=DriverManager.getConnection(url,"root","");               File file=new File(args[0]);               FileInputStream fis=new FileInputStream(file);               PreparedStatement pstmt=conn.prepareStatement(                                "insert into picture(picture) values(?)");               int bytes=(int)file.length();               System.out.println(bytes);                  pstmt.setBinaryStream(1,fis,bytes);//1为插入的参数1，2。。。fileInStream为插入的数据，bytes为字节长度               pstmt.executeUpdate();

               conn.close();               fis.close();     }catch(Exception e){              System.out.println(e.getMessage());     }     }}