HttpClent

public class UrlDispatcherUtil {
	
	private HttpClient client = new HttpClient();
	
	public UrlDispatcherUtil(String host, int port, String protocol){
		client.getHostConfiguration().setHost(host, port, protocol);
	}
	
	public String getRequest(String url) throws Exception{
		String destUrl = url.replaceAll("%26", "&");
		
		URI uri = new URI(destUrl,false,"UTF-8");   
		
		GetMethod get = new GetMethod( uri.toString() );
		client.executeMethod(get);
		String r = get.getResponseBodyAsString();
		get.releaseConnection();
		
		return r;
	}
	
	
	public void doGet( HttpServletRequest req, HttpServletResponse resp ) throws URIException, NullPointerException{
		String queryPath = req.getRequestURI();
		StringBuffer sb = new StringBuffer(queryPath);
		Set<String > keys = req.getParameterMap().keySet();
		sb.append("?");
		
		for(String key : keys){
			sb.append(key).append("=").append(req.getParameter(key)).append("&");
		}
		sb.append("t=").append(System.currentTimeMillis());
		queryPath = "/nsa"+sb.toString();
		System.out.println(queryPath);
		String destUrl = queryPath.replaceAll("%26", "&");
		URI uri = new URI(destUrl,false,"UTF-8");   
		GetMethod get = new GetMethod( uri.toString());
		try {
			client.executeMethod(get);
		} catch (IOException e) {
			e.printStackTrace();
			throw new RuntimeException(e);
		}

		try {
			for( Header header : get.getRequestHeaders() ){
				resp.addHeader(header.getName(), header.getValue() );
			}
			resp.setCharacterEncoding(get.getResponseCharSet());
			System.out.println(get.getResponseCharSet());
			Streams.copy(get.getResponseBodyAsStream(), resp.getOutputStream());
		} catch (IOException e) {
			e.printStackTrace();
			throw new RuntimeException(e);
		}
		
		resp.setStatus( get.getStatusCode() );
		get.releaseConnection();
	}

	public void doPost( HttpServletRequest req, HttpServletResponse resp ) throws NullPointerException, HttpException, IOException{
		System.out.println("dopost begin --------------------------");
		String queryPath = req.getRequestURI();
		StringBuffer sb = new StringBuffer("/nsa").append(queryPath);
		Set<String > keys = req.getParameterMap().keySet();
		URI uri = new URI(sb.toString(),false,"UTF-8");   
		
		System.out.println("dopost begin --------------------------"+uri.toString());
		
		PostMethod pt = new PostMethod( uri.toString() );
		List<NameValuePair> ptParams = new ArrayList<NameValuePair>();
		for(String key : keys ){
			NameValuePair pair = new NameValuePair(key, req.getParameter(key));
			ptParams.add(pair);
		}
		
		NameValuePair[] pa = new NameValuePair[keys.size()];
		ptParams.toArray(pa);
		
		pt.setRequestBody( pa );
		int statusCode = client.executeMethod(pt);
		
		System.out.println(statusCode+"+++++++++++++++++++++++++++++++++");
		if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
				|| statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
			Header locationHeader = pt.getResponseHeader("location");
			String location = null;
			
			if (locationHeader != null) {
				location = locationHeader.getValue();
				System.out.println("The page was redirected to:" + location);
			} else {
				System.err.println("Location field value is null.");
			}
		} 
		for( Header header : pt.getRequestHeaders() ){
			resp.addHeader(header.getName(), header.getValue() );
		}
		
		resp.setStatus( pt.getStatusCode() );
		resp.setCharacterEncoding(pt.getResponseCharSet());
		System.out.println(pt.getResponseCharSet());
		Streams.copy(pt.getResponseBodyAsStream(), resp.getOutputStream());
		pt.releaseConnection();
	}

	public String postRequest(String url, Map<String,String> params) throws Exception {
		
		PostMethod pt = new PostMethod( url );
		
		List<NameValuePair> ptParams = new ArrayList<NameValuePair>();
		for(String key : params.keySet() ){
			NameValuePair pair = new NameValuePair(key, params.get(key));
			ptParams.add(pair);
		}
		
		NameValuePair[] pa = new NameValuePair[params.size()];
		ptParams.toArray(pa);
		
		pt.setRequestBody( pa );
		
		int statusCode = client.executeMethod(pt);
		if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
				|| statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
			Header locationHeader = pt.getResponseHeader("location");
			String location = null;
			
			if (locationHeader != null) {
				location = locationHeader.getValue();
				System.out.println("The page was redirected to:" + location);
			} else {
				System.err.println("Location field value is null.");
			}
		} 
		
		String r = pt.getResponseBodyAsString();
		pt.releaseConnection();
		return r;
	}
} :)