关于HttpClient的问题

package com.cstp.reptile.utils;

import java.io.IOException;

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;

public class SimpleHttpClient {

	public static void main(String[] args) throws IOException {
		HttpClient client = new HttpClient();
		
		// 执行postMethod
		int statusCode = client.executeMethod(getPostMethod());
		// HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发
		// 301或者302
		if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || 
		statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
		    // 从头中取出转向的地址
		    Header locationHeader = getPostMethod().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.");
		    }
		    return;
		}

	}

	

	/**
	 * 使用POST方式提交数据
	 * 
	 * @return
	 */
	private static HttpMethod getPostMethod() {
		String url = "http://search.51job.com/jobsearch/keyword_search.php";
		PostMethod post = new PostMethod(url);
		NameValuePair keyword1 = new NameValuePair("keyword1", "软件工程师 java");
		NameValuePair keyword = new NameValuePair("keyword", "软件工程师 java");
		NameValuePair jobarea = new NameValuePair("jobarea", "0100");
		NameValuePair keywordtype = new NameValuePair("keywordtype", "2");
		post.setRequestBody(new NameValuePair[] { keyword1, keyword, jobarea, keywordtype });
		return post;
	}
}

2007-11-26 21:07:02 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
信息: I/O exception (org.apache.commons.httpclient.NoHttpResponseException) caught when processing request: The server search.51job.com failed to respond
2007-11-26 21:07:02 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
信息: Retrying request

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
	<classpathentry kind="src" path="src"/>
	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
	<classpathentry kind="lib" path="lib/commons-codec-1.3.jar"/>
	<classpathentry kind="lib" path="lib/commons-httpclient-3.1.jar"/>
	<classpathentry kind="lib" path="lib/commons-logging-1.1.jar"/>
	<classpathentry kind="output" path="bin"/>
</classpath>