Java通过http访问网页及xml及文件并保存到local

转自“http://blog.youkuaiyun.com/longronglin/archive/2008/04/24/2325214.aspx”

下面的是简易版,详细地可以根据此进行修改.比如文件后缀......
下面的代码进行过测试：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Test 类
 * 
 * @author Ma rulin
 * 
 * @version 1.0
 * 
 */
public class Test {

    /**
     * 主程序入口
     * @param args 输入参数数组
     */
    public static void main(String[] args) {
        System.out.println("beging...");
        DownLoadPages("http://www.cctv.com/download/showtime.zip","e:/fileDown.zip");
        System.out.println("end.");
    }

    /**
     * 下载网页 或 文件
     * @param urlStr 网页地址 比如: http://www.163.com
     * @param outPath 文件输出路径
     */
    public static void DownLoadPages(String urlStr, String outPath)
    {
        /** 读入输入流的数据长度 */
        int chByte = 0;
        
        /** 网络的url地址 */
        URL url = null;
        
        /** http连接 */
        HttpURLConnection httpConn = null;
        
        /** 输入流 */
        InputStream in = null;
        
        /** 文件输出流 */
        FileOutputStream out = null;

        try
        {
            url = new URL(urlStr);
            httpConn = (HttpURLConnection) url.openConnection();
            HttpURLConnection.setFollowRedirects(true);
            httpConn.setRequestMethod("GET"); 
            httpConn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)"); 
            
            in = httpConn.getInputStream();
            out = new FileOutputStream(new File(outPath));

            chByte = in.read();
            while (chByte != -1)
            {
                out.write(chByte);
                //System.out.println(chByte);
                chByte = in.read();
            }
        }
        catch (MalformedURLException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                out.close();
                in.close();
                httpConn.disconnect();
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
            }
        }
    }


}

访问xml的测试如下:
DownLoadPages("http://blog.youkuaiyun.com/longronglin/Rss.aspx","e:/mrl.xml");

然后打开mrl.xml即可

其中的设置也可以模拟firefox,代码如下:
            httpConn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14");