如何调用别人的接口或网络上的接口

java工具类

import java.io.IOException;
import java.util.Map;


import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;


import com.google.gson.Gson;




public class HttpClientUtil {
    
    private final static String CONTENT_TYPE_TEXT_JSON = "text/json";
    
    public static String postRequest(String url, Map param) throws ClientProtocolException, IOException{
        
        CloseableHttpClient client = HttpClients.createDefault();


        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");
        
        Gson gson = new Gson();
        String parameter = gson.toJson(param);
        StringEntity se = new StringEntity(parameter,"UTF-8");
        se.setContentType(CONTENT_TYPE_TEXT_JSON);
        httpPost.setEntity(se);


        CloseableHttpResponse response = client.execute(httpPost);
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity, "UTF-8");
        
        return result;
    }


}

url要调用的接口

param要传入的参数(Map)类型

测试方法

@RequestMapping(value="buy",produces = "text/plain;charset=utf-8")
	@ResponseBody
	public String buy(String name) throws Exception{
        String url = "https://suggest.taobao.com/sug?code=utf-8&q="+name+"&callback=cb";
        String result=HttpClientUtil.postRequest(url, new HashMap());
		return result;
	}

ps:还需要导入相应版本的包

			org.apache.httpcomponents
			httpclient-cache
			4.5.3
		
		
			org.apache.httpcomponents
			httpmime
			4.5.3
		

		
			com.google.code.gson
			gson
			2.2.4