HttpClient

package com.jt.util;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
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.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
@Service 
public class HttpClientService {
@Autowired 
private CloseableHttpClient httpClient;
@Autowired
private RequestConfig requestConfig;
//重载几个工具类
public String doGet(String url) {
    return doGet(url,null,null);
}
public String doGet(String url,Map<String, String> params) {
    return doGet(url,params,null);
}
public String doGet(String url, Map<String, String> params, String charset){
    // 1.检验字符集编码格式
    charset = StringUtils.isEmpty(charset)?"UTF-8":charset;
    String result=null;
    // 2.校验map集合是否为null
    if (params != null) {
        url+="?";
        for (Map.Entry<String, String> entry : params.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            url = url + key + "=" + value + "&";
        }
        // 经过循环之后多&符
        url = url.substring(0, url.length() - 1);
    }
    HttpGet httpGet = new HttpGet(url);
    httpGet.setConfig(requestConfig);    //设定超时时间 
    try {
        CloseableHttpResponse response =httpClient.execute(httpGet);
        if(response.getStatusLine().getStatusCode() == 200) {
            HttpEntity httpEntity = response.getEntity();
            result=EntityUtils.toString(httpEntity,charset);
        }
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException(e);//转化成运行时异常
    }
    return result;
}
public String doPost(String url,Map<String,String> params,String charset){
    String result = null;
    //1.定义请求类型
    HttpPost post = new HttpPost(url);
    post.setConfig(requestConfig);      //定义超时时间
    //2.判断字符集是否为null
    if(StringUtils.isEmpty(charset)){
        charset = "UTF-8";
    }
    //3.判断用户是否传递参数
    if(params !=null){
        //3.2准备List集合信息
        List<NameValuePair> parameters = new ArrayList<>();
        //3.3将数据封装到List集合中
        for (Map.Entry<String,String> entry : params.entrySet()) {
            parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        //3.1模拟表单提交
        try {
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters,charset); //采用u8编码
            //3.4将实体对象封装到请求对象中
            post.setEntity(formEntity);//get是拼接字符串，post是setEntity
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }
    //4.发送请求
    try {
        CloseableHttpResponse response = httpClient.execute(post);
        //4.1判断返回值状态
        if(response.getStatusLine().getStatusCode() == 200) {
            result = EntityUtils.toString(response.getEntity(),charset);
        }else{
            System.out.println("获取状态码信息:"+response.getStatusLine().getStatusCode());
            throw new RuntimeException();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return result;
}
//重载方法
public String doPost(String url){
    return doPost(url, null, null);
}
public String doPost(String url,Map<String,String> params){
    return doPost(url, params, null);
}
public String doPost(String url,String charset){
    return doPost(url, null, charset);
}

}