Java reads and writes blobs to mysql

package com.xiyou;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.net.URL;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;


import com.xiyou.util.JdbcUtil;


//大二进制数据的存取
/*
 create database day13;
 user day13;
 create table blobtest(
 id int primary key auto_increment,
 content  MEDIUMBLOB
 );
*/
public class BlobDemo {


public static void main(String[] args) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try{
conn = JdbcUtil.getConnection();
String sql = "select content from blobtest where id=? ";
stmt = conn.prepareStatement(sql);
// InputStream in = ClobDemo.class.getClassLoader().getResourceAsStream("man.txt");
// Reader reader = new InputStreamReader(in);
stmt.setInt(1,1);
rs=stmt.executeQuery();
if(rs.next()){
InputStream in=rs.getBinaryStream("content");
FileOutputStream out=new FileOutputStream("D:/1.jpg");
byte buf[]=new byte[1024];
int len=-1;
while((len=in.read(buf))!=-1){
out.write(buf, 0, len);
}
in.close();
out.close();
}
}catch(Exception e){
e.printStackTrace();
}finally{
JdbcUtil.release(rs, stmt, conn);
}


}


private static void saveBlob() {
//向数据库中插入大文本数据
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try{
conn = JdbcUtil.getConnection();
String sql = "insert into blobtest(content) values(?)";
stmt = conn.prepareStatement(sql);
// InputStream in = ClobDemo.class.getClassLoader().getResourceAsStream("man.txt");
// Reader reader = new InputStreamReader(in);
URL url = ClobDemo.class.getClassLoader().getResource("1.jpg");
String filePath = url.getPath();
File file = new File(filePath);
stmt.setBinaryStream(1, new FileInputStream(file),(int)file.length());//要使用int类型
int num = stmt.executeUpdate();
if(num>0)
System.out.println("添加成功");
}catch(Exception e){
e.printStackTrace();
}finally{
JdbcUtil.release(rs, stmt, conn);
}
}


}