http请求和多线程

/**
 * 
 * @param url：http接口地址
 * @param param：传入参数，格式为?param1=xxx&param2=xxx，如果值xxx含有特殊字符，可以用param = "image=" + URLEncoder.encode(image,"utf-8");
 * @return: 返回调用接口得到的json字符串（是否为json字符串决定于http接口），是json字符串则可以进行相应解析，Map<String,Object> moodRes = (Map<String,Object>)JSONObject.parse(result)
 * @throws Exception
 */
public static String postRequest(String url, String param) throws Exception{
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try {
        URL httpUrl = new URL(url);
        HttpURLConnection conn = (HttpURLConnection)httpUrl.openConnection();
        conn.setRequestMethod("POST");
            
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setUseCaches(false);
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            
        // 获取URLConnection对象对应的输出流
        out = new PrintWriter(conn.getOutputStream());
        // 发送请求参数
        out.print(param);
        // flush输出流的缓冲
        out.flush();
        // 定义BufferedReader输入流来读取URL的响应
        in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
            result += line;
        }
       
    } catch (Exception e) {
        throw e;
    }finally{
        try{
            if(out!=null){
                out.close();
            }
            if(in!=null){
                in.close();
            }
        }
        catch(IOException ex){
            ex.printStackTrace();
        }
    }
    return result;
}

public static String getRequest(String url) throws Exception{
    try {
        URL urlGet = new URL(url);
        HttpURLConnection http = (HttpURLConnection)urlGet.openConnection();
        http.setRequestMethod("GET"); 
        http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        http.setDoOutput(true);
        http.setDoInput(true);

        System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
        System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒

        http.connect();

        InputStream is = http.getInputStream();
        int size = is.available();
            
        byte[] jsonBytes = new byte[size];
        is.read(jsonBytes);
        String message = new String(jsonBytes, "UTF-8"); 

        is.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
    return message;
}

import net.sf.json.JSONObject;
JSONObject jsonObj = JSONObject.fromObject(jsonStr);
String res1 = jsonObj.getString("key1");
int res2 = jsonObj.getInt("key2");

//////////////////////////////////////////////////////////////////////////////////

import com.alibaba.fastjson.JSONObject;
Map<String,Object> jsonObj = (Map<String,Object>)JSONObject.parse(jsonStr);
String res1 = (String)jsonObj.get("key1");
int res2 = (Integer)jsonObj.get("key2");

//用线程池发送请求
ExecutorService executor = Executors.newFixedThreadPool(3);

//问诊
Question taskForQuestion = new Question(symptom);
Thread t1 = new Thread(taskForQuestion);
executor.execute(t1);

//人脸望诊
taskForFace = new LookForFace(facePath);
Thread t2 = new Thread(taskForFace);
executor.execute(t2);

//舌苔望诊
taskForTongue = new LookForTongue(tonguePath);
Thread t3 = new Thread(taskForTongue);
executor.execute(t3);

//等待线程执行完毕，每一个task都发送了请求并获取结果解析后放到task中的某个变量中，执行完后就可以获得这些变量来获得所要的结果
executor.shutdown();
while(!executor.isTerminated()) {
}