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Java中CloseableHttpClient的超時設定和異常處理

Java開發我們常常需要和第三方系統進行通訊,通訊的方式有多種,如dubbo方式,webservice,微服務和CloseableHttpClient等方式,常涉及到超時問題,這裡主要說的是CloseableHttpClient的超時設定以及超市了的異常處理;一般思路就是,

1,定義超時的時間,這個一般作為一個配置項,方便隨時修改;

2,請求配置物件RequestConfig設定超時時間,然後設定到 HttpGet 或 HttpPost 請求方法物件;

3,使用CloseableHttpClient物件執行相應的請求方法,同時使用 try...catch... 捕獲異常,對於超時可通過 SocketTimeoutExcetption 和 ConnectTimeoutException捕獲異常;

例如下面簡要例子(相應的jar自行網上查詢);

package com.xxx.yyy.kkk;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.BasicHttpClientConnectionManager;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

import java.io.IOException;
import java.net.SocketTimeoutException;

public class HttpClient001 {
	
	public void getXXX() throws Exception {
		CloseableHttpClient httpclient = HttpClients.createDefault();	    
	    RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(1000)
	            .setSocketTimeout(1000).setConnectTimeout(1000).build();
	    HttpGet httpGet = new HttpGet("http://www.xxx.com");
	    httpGet.setConfig(requestConfig);	    
	    try {	        
	        CloseableHttpResponse response = httpclient.execute(httpGet);
	        //....do more work...
	    } catch (SocketTimeoutExcetption | ConnectTimeoutException ex) {
	    	System.out.println("請求連線超時");	        
	    } catch (Exception ex) {
	    	System.out.println("請求異常,異常資訊:" + ex.getMessage());	 
		}
	}

}

這樣在Java後端向第三方請求時就可以自己設定需要的超時時間,比較可控點,怎麼樣,試一下吧...