Java httpclient得到鏈接

package com.yuan.test;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class CloseableTest {

	public static void main(String[] args) throws Exception {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpGet httpGet = new HttpGet("http://*****.com/login.do");
            CloseableHttpResponse response1 = httpclient.execute(httpGet);
            // The underlying HTTP connection is still held by the response object
            // to allow the response content to be streamed directly from the network socket.
            // In order to ensure correct deallocation of system resources
            // the user MUST call CloseableHttpResponse#close() from a finally clause.
            // Please note that if response content is not fully consumed the underlying
            // connection cannot be safely re-used and will be shut down and discarded
            // by the connection manager.
            try {
                System.out.println(response1.getStatusLine());
                HttpEntity entity1 = response1.getEntity();
                // do something useful with the response body
                // and ensure it is fully consumed
                EntityUtils.consume(entity1);
            } finally {
                response1.close();
            }

            HttpPost httpPost = new HttpPost("http://*******/login.do");
            List <NameValuePair> nvps = new ArrayList <NameValuePair>();
            nvps.add(new BasicNameValuePair("username", "vip"));
            nvps.add(new BasicNameValuePair("password", "secret"));
            httpPost.setEntity(new UrlEncodedFormEntity(nvps));//添加參數
            CloseableHttpResponse response2 = httpclient.execute(httpPost);

            try {
                System.out.println(response2.getStatusLine());
                HttpEntity entity2 = response2.getEntity();
                // do something useful with the response body
                // and ensure it is fully consumed
                EntityUtils.consume(entity2);
            } finally {
                response2.close();
            }
        } finally {
            httpclient.close();
        }
    }

}

另外的一些說明能夠參考博文:java

http://blog.csdn.net/wangpeng047/article/details/19624529apache

使用HttpClient發送請求、接收響應很簡單,通常須要以下幾步便可。服務器

1. 建立HttpClient對象。socket

2. 建立請求方法的實例,並指定請求URL。若是須要發送GET請求,建立HttpGet對象;若是須要發送POST請求,建立HttpPost對象。spa

3. 若是須要發送請求參數,可調用HttpGet、HttpPost共同的setParams(HetpParams params)方法來添加請求參數;對於HttpPost對象而言,也可調用setEntity(HttpEntity entity)方法來設置請求參數。.net

4. 調用HttpClient對象的execute(HttpUriRequest request)發送請求,該方法返回一個HttpResponse。code

5. 調用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可獲取服務器的響應頭;調用HttpResponse的getEntity()方法可獲取HttpEntity對象,該對象包裝了服務器的響應內容。程序可經過該對象獲取服務器的響應內容。orm

6. 釋放鏈接。不管執行方法是否成功,都必須釋放鏈接對象

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