java HttpClientHelper

1 首先配置pom.xml，具体参考我的这篇文章：使用httpclient需要的maven依赖

2 上代码

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import com.alibaba.fastjson.JSON;

public class HttpClientHelper {

    /**
     * 普通get请求
     * @param url
     * @return
     */
    public static String get(String url) {
        String result = "";
        HttpClient client = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url);
        try {
            HttpResponse response = client.execute(httpGet);
            HttpEntity entity = response.getEntity();
            result = EntityUtils.toString(entity, "UTF-8");
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 普通post请求：application/json和application/x-www-form-urlencoded
     * @param url
     * @param params
     * @param contentType
     * @return
     */
    public static String post(String url, String params, String contentType) {
        String result = "";
        HttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        httpPost.addHeader("Content-type", contentType + "; charset=utf-8");
        HttpResponse response = null;
        try {
            StringEntity entity = new StringEntity(params, Charset.forName("UTF-8"));
            entity.setContentEncoding("UTF-8");
            httpPost.setEntity(entity);
            response = httpClient.execute(httpPost);
        } catch (Exception e) {
            // 后期记录异常
        }

        try {
            HttpEntity entity = response.getEntity();
            result = EntityUtils.toString(entity, "UTF-8");
        } catch (Exception e) {
            // 后期记录异常
        }

        return result;
    }
}