java 下载网页，图片

/**
	 * 抓取网上的图片
	 * [延伸]居然都支持下载网页了
	 * @param imgSrc
	 * @param filePath
	 */
	public static void downloadImgByNet(String imgSrc,String filePath,String fileName){
		try{
			URL url = new URL(imgSrc);
			URLConnection conn = url.openConnection();
			//设置超时间为3秒
			conn.setConnectTimeout(3*1000);
			//防止屏蔽程序抓取而返回403错误
			conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
			//输出流
			InputStream str = conn.getInputStream();

			//控制流的大小为1k
			byte[] bs = new byte[1024];

			//读取到的长度
			int len = 0;

			//是否需要创建文件夹
			File saveDir = new File(filePath);  
	        if(!saveDir.exists()){  
	            saveDir.mkdir();  
	        }  
	        File file = new File(saveDir+File.separator+fileName);   

			//实例输出一个对象
			FileOutputStream out = new FileOutputStream(file);
			//循环判断，如果读取的个数b为空了，则is.read()方法返回-1，具体请参考InputStream的read();
			while ((len = str.read(bs)) != -1) {
				//将对象写入到对应的文件中
				out.write(bs, 0, len);   
			}

			//刷新流
			out.flush();
			//关闭流
			out.close();
			str.close();
			
			System.out.println("下载成功");

		}catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		//下载图片
		//downloadImgByNet("http://manyou.189.cn/images/flag/md276.jpg","d:/resource/images/diaodiao/country/","缅甸.jpg");
		
		//下载网页
		downloadImgByNet("http://manyou.189.cn/country/country.do?idCode=md276","d:/resource/images/diaodiao/country/","缅甸.html");
	}