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轉自:
http://www.java265.com/JavaCourse/202204/2933.html
下文筆者將採用最簡單的示例講述HttpClient的使用，如下所示
HttpClient的使用流程
1. 創建HttpClient對象
2. 創建請求方法的實例，並指定請求URL。如果需要發送GET請求，創建HttpGet對象；如果需要發送POST請求，創建HttpPost對象
3. 如果需要發送請求參數，可調用HttpGet、HttpPost共同的setParams(HttpParams 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
4. 調用HttpClient對象的execute(HttpUriRequest request)發送請求，
該方法返回一個HttpResponse
5. 調用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可獲取伺服器的響應頭
調用HttpResponse的getEntity()方法可獲取HttpEntity對象，該對象包裝了伺服器的響應內容
程式可通過該對象獲取伺服器的響應內容
6. 釋放連接。無論執行方法是否成功，都必須釋放連接
HttpClient涉及jar包
commons-cli-1.2.jar commons-codec-1.9.jar commons-logging-1.2.jar fluent-hc-4.5.1.jar httpclient-4.5.1.jar httpclient-cache-4.5.1.jar httpclient-win-4.5.1.jar httpcore-4.4.3.jar httpcore-ab-4.4.3.jar httpcore-nio-4.4.3.jar httpmime-4.5.1.jar jna-4.1.0.jar jna-platform-4.1.0.jar
HttpClient示例
package com.java265;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class HttpClientTest {
public static void main(String[] args) throws Exception{
List<NameValuePair> formparams = new ArrayList<NameValuePair>();
formparams.add(new BasicNameValuePair("account", ""));
formparams.add(new BasicNameValuePair("password", ""));
HttpEntity reqEntity = new UrlEncodedFormEntity(formparams, "utf-8");
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(5000)//一、連接超時：connectionTimeout-->指的是連接一個url的連接等待時間
.setSocketTimeout(5000)// 二、讀取數據超時：SocketTimeout-->指的是連接上一個url，獲取response的返回等待時間
.setConnectionRequestTimeout(5000)
.build();
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://java265.com/index.html");
post.setEntity(reqEntity);
post.setConfig(requestConfig);
HttpResponse response = client.execute(post);
if (response.getStatusLine().getStatusCode() == 200) {
HttpEntity resEntity = response.getEntity();
String message = EntityUtils.toString(resEntity, "utf-8");
System.out.println(message);
} else {
System.out.println("請求失敗");
}
}
}
