Java从网络读取图片并保存至本地

package cn.cctv.net;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class ImageRequest {/** * @param args */public static void main(String[] args) throws Exception {//new一个URL对象URL url = new URL("http://img.hexun.com/2011-06-21/130726386.jpg");//打开链接HttpURLConnection conn = (HttpURLConnection)url.openConnection();//设置请求方式为"GET"conn.setRequestMethod("GET");//超时响应时间为5秒conn.setConnectTimeout(5 * 1000);//通过输入流获取图片数据InputStream inStream = conn.getInputStream();//得到图片的二进制数据，以二进制封装得到数据，具有通用性byte[] data = readInputStream(inStream);//new一个文件对象用来保存图片，默认保存当前工程根目录File imageFile = new File("BeautyGirl.jpg");//创建输出流FileOutputStream outStream = new FileOutputStream(imageFile);//写入数据outStream.write(data);//关闭输出流outStream.close();}public static byte[] readInputStream(InputStream inStream) throws Exception{ByteArrayOutputStream outStream = new ByteArrayOutputStream();//创建一个Buffer字符串byte[] buffer = new byte[1024];//每次读取的字符串长度，如果为-1，代表全部读取完毕int len = 0;//使用一个输入流从buffer里把数据读取出来while( (len=inStream.read(buffer)) != -1 ){//用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度outStream.write(buffer, 0, len);}//关闭输入流inStream.close();//把outStream里的数据写入内存return outStream.toByteArray();}}