從網路中獲取網頁資料時，網頁有可能使用GZIP壓縮技術對頁面進行壓縮，這樣就會減小通過網路傳輸的資料量，提高瀏覽的速度。因此在獲取網路資料時要對其進行判斷，對GZIP格式的資料使用GZIPInputStream對其特殊處理，否則在獲取資料可能出現亂碼.

import java.io.ByteArrayOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.zip.GZIPInputStream;

import com.lowagie.text.pdf.codec.Base64.InputStream;

/**
 * 從網路中獲取網頁資料
 * @author 杜文俊
 */

public class stretest {
	@SuppressWarnings("static-access")
    public static void main(String[] args) throws Exception {
        String result = "";
        URL url = new URL("http://www.yancao18.com/server/getnode.php?user=test&pwd=test");
        //URL url = new URL("http://www.ku6.com/");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(6* 1000);//設定連線超時xml 實體物件
        if (conn.getResponseCode() != 200) throw new RuntimeException("請求url失敗");
        InputStream inputStream = (InputStream) conn.getInputStream();//得到網路返回的輸入流
        if("gzip".equals(conn.getContentEncoding())){
            result = readDataForZgip(inputStream, "GBK");
        }else {
            result = readData(inputStream, "GBK");
        }
        conn.disconnect();
        System.out.println(result);
        System.err.println("ContentEncoding: " + conn.getContentEncoding());
    }
    
    //第一個引數為輸入流,第二個引數為字符集編碼
    public static String readData(InputStream inSream, String charsetName) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while( (len = inSream.read(buffer)) != -1 ){
            outStream.write(buffer, 0, len);
        }
        byte[] data = outStream.toByteArray();
        outStream.close();
        inSream.close();
        return new String(data, charsetName);
    }
    
    //第一個引數為輸入流,第二個引數為字符集編碼
    public static String readDataForZgip(InputStream inStream, String charsetName) throws Exception{
        GZIPInputStream gzipStream = new GZIPInputStream(inStream);
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer =new  byte[1024];
        int len = -1;
        while ((len = gzipStream.read(buffer))!=-1) {
            outStream.write(buffer, 0, len);
        }
        byte[] data = outStream.toByteArray();
        outStream.close();
        gzipStream.close();
        inStream.close();
        return new String(data, charsetName);
    }

}