HttpClient模拟http请求

最近工作中使用到了两个jar包 httpclient.jar, httpcore.jar

HttpClient 的 abort（终止）程序示例

[java] view plaincopyprint?
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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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package org.apache.http.examples.client;  

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;  

/**
 * This example demonstrates how to abort an HTTP method before its normal completion.
 * 在HttpClient 普通完成前调用abort方法对其进行终止
 */
public class ClientAbortMethod {  

    public final static void main(String[] args) throws Exception {
        HttpClient httpclient = new DefaultHttpClient();
        try {
            HttpGet httpget = new HttpGet("http://www.apache.org/");  

            System.out.println("executing request " + httpget.getURI());
            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();  

            System.out.println("----------------------------------------");
            System.out.println(response.getStatusLine());
            if (entity != null) {
                System.out.println("Response content length: " + entity.getContentLength());
            }
            System.out.println("----------------------------------------");  

            // Do not feel like reading the response body
            // Call abort on the request object
            // 不打算读取response body
            // 调用request的abort方法
            httpget.abort();
        } finally {
            // When HttpClient instance is no longer needed,
            // shut down the connection manager to ensure
            // immediate deallocation of all system resources
            // 当HttpClient实例不再需要是，确保关闭connection manager，以释放其系统资源
            httpclient.getConnectionManager().shutdown();
        }
    }  

}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

public class TTT
{

	/**
	 * @param args
	 * @throws IOException
	 * @throws ClientProtocolException
	 */
	public static void main(String[] args) throws ClientProtocolException, IOException
	{
		// 创建HttpClient实例
		HttpClient httpclient = new DefaultHttpClient();
		// 创建Get方法实例
		HttpGet httpgets = new HttpGet("http://www.baidu.com");

		HttpResponse response = httpclient.execute(httpgets);
		HttpEntity entity = response.getEntity();
		if (entity != null)
		{
			InputStream instreams = entity.getContent();
			String str = convertStreamToString(instreams);
			System.out.println(str);
			//终止http请求和响应
			httpgets.abort();
		}
	}

	public static String convertStreamToString(InputStream is)
	{
		BufferedReader reader = new BufferedReader(new InputStreamReader(is));
		StringBuilder sb = new StringBuilder();

		String line = null;
		try
		{
			while ((line = reader.readLine()) != null)
			{
				sb.append(line + "\n");
			}
		} catch (IOException e)
		{
			e.printStackTrace();
		} finally
		{
			try
			{
				is.close();
			} catch (IOException e)
			{
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

}