java下载网页内容和网络图片

一个简单的例子

 

 

import java.io.BufferedReader;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class UrlResource {public static void main(String[] args){try {System.out.println(UrlResource.getUrlDetail("http://www.baidu.com",true));saveUrlFile("http://www.baidu.com/img/baidu_jgylogo3.gif", "D:\\1.gif");} catch (Exception e) {e.printStackTrace();}}//获取网络文件，转存到fileDes中，fileDes需要带文件后缀名public static void saveUrlFile(String fileUrl,String fileDes) throws Exception{File toFile = new File(fileDes);if (toFile.exists()){//throw new Exception("file exist");return;}toFile.createNewFile();FileOutputStream outImgStream = new FileOutputStream(toFile);outImgStream.write(getUrlFileData(fileUrl));outImgStream.close();}//获取链接地址文件的byte数据public static byte[] getUrlFileData(String fileUrl) throws Exception{URL url = new URL(fileUrl);HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();httpConn.connect();InputStream cin = httpConn.getInputStream();ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = cin.read(buffer)) != -1) {outStream.write(buffer, 0, len);}cin.close();byte[] fileData = outStream.toByteArray();outStream.close();return fileData;}//获取链接地址的字符数据，wichSep是否换行标记public static String getUrlDetail(String urlStr,boolean withSep) throws Exception{URL url = new URL(urlStr);HttpURLConnection httpConn = (HttpURLConnection)url.openConnection();httpConn.connect();InputStream cin = httpConn.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(cin,"UTF-8"));StringBuffer sb = new StringBuffer();String rl = null;while((rl = reader.readLine()) != null){if (withSep){sb.append(rl).append(System.getProperty("line.separator"));}else{sb.append(rl);}}return sb.toString();}}