Java实现MySQL图片存取操作

转载自：/article/3704870.html

存入操作

[java] view plaincopy

/*

---------------表结构------------

表名：student2

+--------+-------------+------+-----+---------+-------+

| Field | Type | Null | Key | Default | Extra |

+--------+-------------+------+-----+---------+-------+

| id | int(4) | NO | PRI | NULL | |

| name | varchar(20) | YES | | NULL | |

| stupic | blob | YES | | NULL | |

+--------+-------------+------+-----+---------+-------+

*/

package com.ibm.jdbc;

import java.io.*;

import java.sql.*;

public class StoreBLOB {

public static void main(String[] args) {

//连接MySQl数据库

Connection con=DBManager.getConnection();

PreparedStatement ps=null;

InputStream in=null;

try {

//从本地硬盘读取一张读片

in=new FileInputStream("d:/111.jpg");

ps=con.prepareStatement("insert into student2 values(?,?,?)");

ps.setInt(1,2);

ps.setString(2, "Tom");

ps.setBinaryStream(3, in, in.available());

ps.executeUpdate();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

finally

{

try {

//关闭流

if(in!=null) in.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

//关闭相关连接

DBManager.close(ps, con);

}

}

}

取出操作

[java] view plaincopy

package com.ibm.jdbc;

import java.sql.*;

import java.io.*;

public class GetBLOB {

public static void main(String[] args) {

Connection con=DBManager.getConnection();

Statement st=null;

ResultSet rs=null;

InputStream in=null;

OutputStream out=null;

try {

st=con.createStatement();

rs=st.executeQuery("select stupic from student2 where id=2");

rs.next(); //将光标指向第一行

//从rs中读取stupic放进InputStream对象中

in=rs.getBinaryStream("stupic");

//申明byte数组,用来存放图片流

byte[] b=new byte[40000];

in.read(b); //从InputStream对象中读取数据放进byte数组中

//实例化OutputStream对象，在D盘创建一个图片文件

out=new FileOutputStream("d:/222.jpg");

//将文件输出，内容则为byte数组里面的数据

out.write(b);

out.flush();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

finally

{

try {

if(in!=null)

in.close();

if(out!=null)

out.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

DBManager.close(rs, st, con);//关闭相关连接

}

}

}