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(和php搭配之最佳组合).jdbc.driver";//驱动
        string url="jdbc:mysql(和php搭配之最佳组合)://127.0.0.1/test?useunicode=true;characterencoding=8859_1";// 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());
     }
     }
}