要用到的jar包

使用阿里的fastjson來對json格式資料進行解析

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方式請求：" + 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方式請求：" + result);
				jsonobject = JSON.parseObject(result);
			}

		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return jsonobject;
	}
}


 

呼叫阿里雲的一個公共介面，引數為地名，返回該地的經緯度。

分別使用get與post方法呼叫該介面，兩種呼叫方法大體相同，不同的是post方式不能在url中傳參，使用setEntity方法加入引數。