java读取网络上的资源保存本地

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.FileOutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class Getpic{

public Getpic(){

}

public static boolean saveUrlAs(String fileUrl, String savePath)/*fileUrl网络资源地址*/

{

try

{

URL url = new URL(fileUrl);/*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));

/*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;

while ((count = in.read(buffer)) > 0)/*将输入流以字节的形式读取并写入buffer中*/

{

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();

return true;/*网络资源截取并存储本地成功返回true*/

}

catch (Exception e)

{

System.out.println(e + fileUrl + savePath);

return false;

}

}

public static void main(String[] args)

{

Getpic pic = new Getpic();/*创建实例*/

String photoUrl =
http://hiphotos.baidu.com/yanshennan/pic/item/03a505c8bcbaf6557f3e6f8a.jpg";
/*photoUrl.substring(photoUrl.lastIndexOf("/")的方法将返回最后一个符号为

* ‘/’后photoUrl变量中的所有字符，包裹此自身符号*/

String fileName = photoUrl.substring(photoUrl.lastIndexOf("/"));

String filePath = "E:";

/*调用函数，并且进行传参*/

boolean flag = pic.saveUrlAs(photoUrl, filePath + fileName);

System.out.println("Run ok!\n Get URL file " + flag);

System.out.println(filePath);

System.out.println(fileName);

}

}

运行结果：

Run ok!

Get URL file true

E:

/03a505c8bcbaf6557f3e6f8a.jpg