http协议中post方法发出请求

package com.chinaums.szm.test.base.igoodful;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.junit.Test;

import java.io.IOException;
import java.util.*;

public class TestPost {

    public String doPost(String url, Map<String,String> map, String charset){
        CloseableHttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        try{
            httpClient = HttpClients.createDefault();
            httpPost =new HttpPost(url);
            List<NameValuePair> list = new ArrayList<>();
            Iterator iterator = map.entrySet().iterator();
            while (iterator.hasNext()){
                Map.Entry<String,String> entry =(Map.Entry<String,String>) iterator.next();
                list.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));
            }
            if (list.size() > 0){
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
                httpPost.setEntity(entity);
            }
            HttpResponse httpResponse = httpClient.execute(httpPost);
            if (httpResponse != null){
                HttpEntity httpEntity = httpResponse.getEntity();
                if (httpEntity != null){
                    result = EntityUtils.toString(httpEntity,charset);
                }
            }
        }catch (Exception ex){
            ex.printStackTrace();
        }
        return result;
    }
@Test
    public void test() throws IOException {
        String url = "http://admin.tingwen.me/index.php/api/interfaceXykj/touList";
        Map<String,String> map = new HashMap<>();
        map.put("page","100");
        String result = this.doPost(url,map,"UTF-8");
//将输出更加优美的方式展示出。
        ObjectMapper mapper = new ObjectMapper();
        Object object = mapper.readValue(result,Object.class);
        System.out.println( mapper.writerWithDefaultPrettyPrinter().writeValueAsString(object));
    }
}