使用httpClient模擬提交多表單部件

1. 在pom.xml加入對httpclient的必需的jar包的依賴

   <dependency>
     <groupId>org.apache.httpcomponents</groupId>
     <artifactId>httpclient</artifactId>
     <version>4.5.2</version>
   </dependency>
   //httpclient快取
   <dependency>
     <groupId>org.apache.httpcomponents</groupId>
     <artifactId>httpclient-cache</artifactId>
     <version>4.5</version>
   </dependency>
   //http的mime型別都在這裡面
   <dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.3.2</version>
   </dependency>
    
   

2. 程式碼

   /**
    * 帶引數的Post請求
    * 
    * @param url 請求URL
    * @param paramMap 請求引數
    * @return
    */
   public static String doPost(String url, Map<String, String> paramMap) {
   	CloseableHttpClient httpclient = null;
   	CloseableHttpResponse response = null;
   	String result = "";
   	try {
   		httpclient = HttpClients.createDefault();
   		HttpPost httpPost = new HttpPost(url);
   		RequestConfig requestConfig = RequestConfig.custom()
   				.setConnectTimeout(35000)
   				.setConnectionRequestTimeout(35000)  
   		        .setSocketTimeout(60000)
   		        .build();  
   		httpPost.setConfig(requestConfig);
   		if (null != paramMap && paramMap.size()>0) {
   			List<NameValuePair> nvps = new ArrayList<NameValuePair>();
   			Set<Map.Entry<String, String>> set = paramMap.entrySet();
   			Iterator<Map.Entry<String, String>> it = set.iterator();
   			while (it.hasNext()) {
   				Map.Entry<String, String> mapEntry = it.next();
   				nvps.add(new BasicNameValuePair(mapEntry.getKey(), new String(mapEntry.getValue().getBytes("UTF-8"),"iso8859-1")));
   			}
   			httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
   		}
   		response = httpclient.execute(httpPost);
   	    HttpEntity entity = response.getEntity();
   	    result = EntityUtils.toString(entity);
   	} catch (ClientProtocolException e) {
   		e.printStackTrace();
   	} catch (IOException e) {
   		e.printStackTrace();
   	} finally {
   		try {
   	    	if (null != response) {
   	    		response.close();
   	    	}
   	    	if (null != httpclient) {
   	    		httpclient.close();
   	    	}
   		} catch (IOException e) {
   			e.printStackTrace();
   		}
   	}
   	return result;
   }```
   
    
   

httpclient的基礎用法請檢視此連結 httpclient使用基本教程