package com.newlixon.util;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.FileOutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

/**

*

* @author ZJ

* 根据图片url,下载图片

*/

public class PicExport {

public static void download(String _url) throws Exception{

//获取文件名，文件名实际上在URL中可以找到

String fileName = _url.substring(_url.lastIndexOf("/")+1).toString();

//这里服务器上要将此图保存的路径

//String savePath = getRequest().getRealPath(UPLOAD_PATH);

//下载图片存放的路径

String savePath = "C:\\barcode\\";

try {

URL url = new URL(_url);/*将网络资源地址传给,即赋值给url*/

/*此为联系获得网络资源的固定格式用法，以便后面的in变量获得url截取网络资源的输入流*/

HttpURLConnection connection = (HttpURLConnection)url.openConnection();

DataInputStream in = new DataInputStream(connection.getInputStream());

/*此处也可用BufferedInputStream与BufferedOutputStream*/

DataOutputStream out = new DataOutputStream(new FileOutputStream(savePath+fileName));

/*将参数savePath，即将截取的图片的存储在本地地址赋值给out输出流所指定的地址*/

byte[] buffer = new byte[4096];

int count = 0;

/*将输入流以字节的形式读取并写入buffer中*/

while ((count = in.read(buffer)) > 0) {

out.write(buffer, 0, count);

}

out.close();/*后面三行为关闭输入输出流以及网络资源的固定格式*/

in.close();

connection.disconnect();

//返回内容是保存后的完整的URL

} catch (Exception e) {

}

}

}