Blob存储读取图片

package com.jdbctest.clobtest;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.*;

import com.jdbctest.Util.JDBCUtil;

public class BlobTest {
        public static void main(String args[]){
            Connection conn = null;
            Statement stmt = null;
            PreparedStatement ps = null;
            ResultSet rs = null;

            //获取数据库对象
            conn = JDBCUtil.getConnection();
            //表存在则删除它
            String sql = "DROP TABLE IF EXISTS blobtest";

            try {
                stmt = conn.createStatement();
                System.out.println(sql);
                stmt.executeUpdate(sql);
                //创建表
                sql = "CREATE TABLE blobtest(" +
                "b_id INT NOT NULL AUTO_INCREMENT,"+
                "b_title VARCHAR(50),"+
                "b_text LongBlob,"+
                "PRIMARY KEY(b_id)"+
                ")";
            System.out.println(sql);
            stmt.executeUpdate(sql);
            System.out.println("创建数据表成功!");

            sql="INSERT INTO blobtest(b_title,b_text)VALUES(?,?)";
            ps = conn.prepareStatement(sql);
            //插入图片
            //File file = new File("F:\\image\\yahoo.jpg");
            File file = new File("d:\\wuyu\\image\\sea.jpg");
            InputStream inputStream = new FileInputStream(file);
            //BufferedInputStream bis=new BufferedInputStream(inputStream);

            //以前的时候直接使用setBinaryStream就可以保存图片，但
            //数据库的字符集换成 gbk后就不能用了，一直提示参数类型不匹配，在网上查了一下，
            //直接向数据库中存byte可解决
            //ps.setString(1, file.getName());
            //ps.setBinaryStream(2,inputStream,file.length());
            //ps.executeUpdate();
            try {
                ps.setString(1, file.getName());
                //新建一byte数组
                byte[] buf=new byte[inputStream.available()];
                //将文件读入到byte[]中
                inputStream.read(buf);
                ps.setBytes(2, buf);
                ps.executeUpdate();
                System.out.println("插入成功！");
            } catch (IOException e1) {
                System.out.println("保存图片到数据库成功！");
                e1.printStackTrace();
            }



            //读取数据

            sql = "SELECT b_title,b_text FROM blobtest";
            ps = conn.prepareStatement(sql);
            rs = ps.executeQuery();
            while(rs.next()){
                System.out.println("图片名: "+rs.getString("b_title"));
                //System.out.println("电影名: "+rs.getString("b_title"));
                Blob blob = rs.getBlob("b_text");
                File file2 = new File("d:\\wuyu\\sea.jpg");
                OutputStream outputStream = new FileOutputStream(file2);
                try {
                    outputStream.write(blob.getBytes(1,(int)blob.length()));
                } catch (IOException e) {
                    e.printStackTrace();
                }
                //打印出来的为对象
                System.out.println("图片内容: "+ blob.getBinaryStream());

            }
            } catch (SQLException e) {
                e.printStackTrace();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }finally{
                JDBCUtil.close(rs, stmt, conn);
            }

        }

}