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.\n", 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: \n", 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);

}

}