SpringMVC结合天气api实现天气查询

package com.util;import java.io.BufferedReader;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;public class NetUtilImpl implements NetUtil{ @Override public String getJson(String url) throws IOException{ HttpURLConnection connection = null; URL url2 = new URL(url); connection=(HttpURLConnection) url2.openConnection();  connection.connect();  int recode = connection.getResponseCode(); BufferedReader bufferedReader = null; String json = new String();   if(recode==200) {  InputStream inputStream = connection.getInputStream(); bufferedReader=new BufferedReader(new InputStreamReader(inputStream,"UTF-8")); String string = null;  while ((string=bufferedReader.readLine())!=null) { json=json+string; ByteBuffer buffer = ByteBuffer.wrap(new String(string).getBytes("UTF-8"));  }   }   return json; }  }