使用java调用http接口

要用到的jar包

使用阿里的fastjson来对json格式数据进行解析

package httpinterface;import java.io.IOException;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;import com.alibaba.fastjson.JSONObject;public class Httptest {public static void main(String args[]) {String url_1 = "http://gc.ditu.aliyun.com/geocoding?a=南京市";String url_2 = "http://gc.ditu.aliyun.com/geocoding";doGetStr(url_1);doPostStr(url_2, "北京市");}public static JSONObject doGetStr(String url) {HttpClient httpclient = HttpClients.custom().build();HttpGet httpget = new HttpGet(url);JSONObject jsonobject = null;try {HttpResponse response = httpclient.execute(httpget);HttpEntity entity = response.getEntity();String result = EntityUtils.toString(entity, "UTF-8");System.out.println("get方式请求：" + result);jsonobject = JSON.parseObject(result);} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return jsonobject;}public static JSONObject doPostStr(String url, String key) {HttpClient httpclient = HttpClients.custom().build();HttpPost httppost = new HttpPost(url);httppost.setEntity(new StringEntity(key, "UTF-8"));JSONObject jsonobject = null;try {HttpResponse response = httpclient.execute(httppost);HttpEntity entity = response.getEntity();if (entity != null) {String result = EntityUtils.toString(entity);System.out.println("post方式请求：" + result);jsonobject = JSON.parseObject(result);}} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return jsonobject;}}

调用阿里云的一个公共接口，参数为地名，返回该地的经纬度。

分别使用get与post方法调用该接口，两种调用方法大体相同，不同的是post方式不能在url中传参，使用setEntity方法加入参数。