一、适用场景
在ESTful webservice中，get方法一般都是用来获取数据。我们可以使用httpcomponents组件来完成调用。
如我们需要发起get请求，携带的参数都是附加到请求的url后面。
url："http://www.xxxxx.com/message?id=000010"
二、代码示例
1 package com.demo.test; 2 3 import java.io.IOException; 4 5 import org.apache.http.HttpEntity; 6 import org.apache.http.HttpStatus; 7 import org.apache.http.client.ClientProtocolException; 8 import org.apache.http.client.methods.CloseableHttpResponse; 9 import org.apache.http.client.methods.HttpGet; 10 import org.apache.http.impl.client.CloseableHttpClient; 11 import org.apache.http.impl.client.HttpClients; 12 import org.apache.http.util.EntityUtils; 13 14 public class Test2 { 15 16 public static String sendInfo(String url, String param) { 17 String geturl = String.format("%s?id=%s", url, param); 18 CloseableHttpClient client = HttpClients.createDefault(); 19 HttpGet get = new HttpGet(geturl); 20 String responseContent = null; // 响应内容 21 CloseableHttpResponse response = null; 22 try { 23 response = client.execute(get); 24 HttpEntity entity = response.getEntity();// 响应体 25 if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {// 正确返回 26 responseContent = EntityUtils.toString(entity, "UTF-8"); 27 } 28 } catch (ClientProtocolException e) { 29 e.printStackTrace(); 30 } catch (IOException e) { 31 e.printStackTrace(); 32 } finally { 33 try { 34 if (response != null) 35 response.close(); 36 if (client != null) 37 client.close(); 38 } catch (IOException e) { 39 e.printStackTrace(); 40 } 41 } 42 return responseContent; 43 } 44 45 public static void main(String[] args) { 46 String param = "000010"; 47 String result = sendInfo("http://www.xxxxx.com/message", param); 48 System.out.println(result); 49 } 50 }
请求成功后，后天会打印返回的信息。
