httpClient发送post请求，带header、body的工具类

自己写一个发送http post请求的工具类，因为需要头部和参数，网上没有合适的，拿出来分享下
只需要传三个参数：地址，头部map，bodymap
另外响应已经将body取出并转成字符串返回

maven引入httpClient

<!-- httpClient -->
<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.2</version>
</dependency>

代码

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
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.springframework.stereotype.Component;public String postMap(String url,Map<String,String> headerMap,Map<String, String> contentMap) {String result = null;CloseableHttpClient httpClient = HttpClients.createDefault();HttpPost post = new HttpPost(url);List<NameValuePair> content = new ArrayList<NameValuePair>();Iterator iterator = contentMap.entrySet().iterator();           //将content生成entitywhile(iterator.hasNext()){  Entry<String,String> elem = (Entry<String, String>) iterator.next();  content.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));  }CloseableHttpResponse response = null;try {Iterator headerIterator = headerMap.entrySet().iterator();          //循环增加headerwhile(headerIterator.hasNext()){  Entry<String,String> elem = (Entry<String, String>) headerIterator.next();  post.addHeader(elem.getKey(),elem.getValue());}if(content.size() > 0){  UrlEncodedFormEntity entity = new UrlEncodedFormEntity(content,"UTF-8");  post.setEntity(entity);}response = httpClient.execute(post);            //发送请求并接收返回数据if(response != null && response.getStatusLine().getStatusCode() == 200){HttpEntity entity = response.getEntity();       //获取response的body部分result = EntityUtils.toString(entity);          //读取reponse的body部分并转化成字符串}return result;} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally {try {httpClient.close();if(response != null){response.close();}} catch (IOException e) {e.printStackTrace();}}return null;}

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