在项目中经常会请求别人的接口,所以经常会用到httpclient工具类,下面是我写的一个简单的工具类
首先引包,因为是maven的项目,所以直接在pom.xml中新增两个依赖,
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5</version> </dependency> <dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>3.1</version> </dependency>
很多人自己写工具类,获取上网扒的别人的工具类
都报错,很多时候就是因为你jar包的版本不同导致的
package com.wonder.Util; import org.apache.http.NameValuePair; import org.apache.http.client.config.CookieSpecs; import org.apache.http.client.config.RequestConfig; 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.cookie.CookieSpec; 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; import org.apache.http.HttpEntity; import java.io.IOException; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Map; /** * Created by Guozhijie on 2016/9/21. */ public class HttpClientUtil { //post 请求 public static String doPost(String url, Map<String,String> map){ String result = null; CloseableHttpClient httpClient= HttpClients.createDefault(); CloseableHttpResponse response=null; HttpPost httpPost=new HttpPost(url); try{ //设置参数 List<NameValuePair> list = new ArrayList<NameValuePair>(); Iterator iterator = map.entrySet().iterator(); while(iterator.hasNext()){ Map.Entry<String,String> elem = (Map.Entry<String, String>) iterator.next(); list.add(new BasicNameValuePair(elem.getKey(),elem.getValue())); } if(list.size() > 0){ UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,"UTF-8"); httpPost.setEntity(entity); } response = httpClient.execute(httpPost); if(response != null){ HttpEntity resEntity = response.getEntity(); if(resEntity != null){ result = EntityUtils.toString(resEntity); } } }catch (Exception e){ e.printStackTrace(); } finally { try{ response.close(); httpClient.close(); }catch (IOException e){ } } return null; } //get请求 public static String get(String path){ RequestConfig config=RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD).build(); CloseableHttpResponse response=null; CloseableHttpClient httpClient=HttpClients.createDefault(); HttpGet httpGet=new HttpGet(path); try{ response=httpClient.execute(httpGet); HttpEntity entity=response.getEntity(); String responseText=EntityUtils.toString(entity); EntityUtils.consume(entity); return responseText; }catch (Exception e){ e.printStackTrace(); }finally { try{ response.close();; httpClient.close(); }catch (IOException e){ } } return null; } }
这样在你webservice请求的时候就可以直接用了