Java实现MySQL图片存取操作

转载自：http://blog.csdn.net/thc1987/article/details/3972201

存入操作

/*
---------------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

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
        }
    }
}