package com.lanqiao.shopping.test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.lanqiao.shopping.utils.DBHelper;
public class Test {
static PreparedStatement pstmt = null;
static ResultSet rs = null;
/*
* 创建图片的表myPicture
* create table myPicture(id number(4) primary key,img blob);
*/
//将图片写进数据库
public static void writeImgToBolb(){
Connection conn = DBHelper.getConn();
String sql = "insert into myPicture(id,img) values(?,?)";
try {
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1,3);//id
//将图片转为输入流
File file = new File("D:\\Eclipse\\ImagesSave\\one.jpg");
InputStream in = new FileInputStream(file);
/*
String a = "sss";
System.out.println(a.length());//字符串是length方法
int[] i = new int[5];//数组是length属性
System.out.println(i.length);*/
//将输入流写入到myPicture表
pstmt.setBinaryStream(2, in,(int)file.length());
int result = pstmt.executeUpdate();
System.out.println("111");
if(result>0){
System.out.println("图片写入成功");
}else{
System.out.println("图片写入失败");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBHelper.closeConn(null, pstmt, conn);
}
}
//从数据库读取图片
public static void readImgToBlob(){
Connection conn = DBHelper.getConn();
String sql = "select * from myPicture where id=?";
try {
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, 1);//id =1
rs = pstmt.executeQuery();
if(rs.next()){
//将图片从数据库中读取出来,类型为InputStream
InputStream imgIn = rs.getBinaryStream("img");
//通过IO流,将图片写到项目中(硬盘)
InputStream in = new BufferedInputStream(imgIn);
//将图片的输出路径设置为src(相对路径),图片名为myPic.png
OutputStream imgOut = new FileOutputStream("D:\\Eclipse\\ImagesSave\\myPic.jpg");
OutputStream out = new BufferedOutputStream(imgOut);
int len = -1;
while((len=in.read())!=-1){
out.write(len);
}
imgOut.close();
out.close();
imgIn.close();
in.close();
System.out.println("照片读取成功");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBHelper.closeConn(rs, pstmt, conn);
}
}
public static void main(String[] args) {
//writeImgToBolb();
readImgToBlob();
}
}
2018.7.30 Oracle的Bolog数据库类型读取和存储
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转载自www.cnblogs.com/qichunlin/p/9350394.html
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