RequestUtil 获取网址页面信息

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.Reader;

import java.io.StringWriter;

import java.io.Writer;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

public class RequestUtil {

         public final static String getErrorUrl(HttpServletRequest request) {

                   String errorUrl = (String) request.getAttribute("javax.servlet.error.request_uri");

                   if (errorUrl == null) {

                            errorUrl = (String) request.getAttribute("javax.servlet.forward.request_uri");

                   }

                   if (errorUrl == null) {

                            errorUrl = (String) request.getAttribute("javax.servlet.include.request_uri");

                   }

                   if (errorUrl == null) {

                            errorUrl = request.getRequestURL().toString();

                   }

                   return errorUrl;

         }

    /**

     * 获取 请求参数

     * @param request

     * @return

     */

         public static String queryString(HttpServletRequest request){

                   Map<String, String[]> params = request.getParameterMap(); 

        String queryString = ""; 

        for (String key : params.keySet()) { 

            String[] values = params.get(key); 

            for (int i = 0; i < values.length; i++) { 

                String value = values[i];

                if(value!=null){

                         value=StringUtil.stringURLDecoderByUTF8(value);

                }

                queryString += key + "=" + value + "&";

            } 

        } 

        // 去掉最后一个空格 

        queryString = queryString.substring(0, queryString.length() - 1); 

        return queryString;

         }

        

         public final static StringBuilder getErrorInfoFromRequest(HttpServletRequest request, boolean isInfoEnabled) {

                   StringBuilder sb = new StringBuilder();

                   String errorUrl = getErrorUrl(request);

                   sb.append(StringUtil.formatMsg("Error processing url: %1, Referrer: %2, Error message: %3. ", errorUrl,

                                     request.getHeader("REFERER"), request.getAttribute("javax.servlet.error.message")));

                   Throwable ex = (Throwable) request.getAttribute("exception");

                   if (ex == null) {

                            ex = (Throwable) request.getAttribute("javax.servlet.error.exception");

                   }

                   if (ex != null) {

                            sb.append(StringUtil.formatMsg("Exception stack trace: ", ex));

                   }

                   return sb;

         }

        

         public final static String getHtml(String fullUrl) throws IOException{

                  

                   URL url = new URL(fullUrl);

                   HttpURLConnection conn = (HttpURLConnection) url.openConnection();

                   InputStream in = conn.getInputStream();

                   Writer writer = new StringWriter();

                   if (in != null) {

                            char[] buffer = new char[1024];

                            try {

                                     Reader reader = new BufferedReader(new InputStreamReader(in,

                                                        "UTF-8"));

                                     int n;

                                     while ((n = reader.read(buffer)) != -1) {

                                               writer.write(buffer, 0, n);

                                     }

                            } finally {

                                     in.close();

                            }

                   }

                   return writer.toString();

         }

        

         public  static void main(String[]args) throws IOException{

                   String url="http://www.baidu.com";

                   String a=getHtml(url);

                   System.out.println("ss:"+a);

         }

        

}