Android-HttpUtil工具类

Posted 2022-10-30 刘德利_Android

Http（Java 版 HttpURLConnection）请求的相关工具类

public class HttpUtil 

    private static final int TIMEOUT_IN_MILLIONS = 5000;

    public interface CallBack 
        void onRequestComplete(String requst);
    

    /**
     * 异步的Get请求
     * @param urlStr
     * @param callBack
     */
    public static void doGetAsyn(final String urlStr, final CallBack callBack) 
        new Thread(new Runnable() 

            @Override
            public void run() 
                try 
                    String result = doGet(urlStr);
                    if (callBack != null) 
                        callBack.onRequestComplete(result);
                    
                 catch (Exception e) 
                    e.printStackTrace();
                
            
        ).start();
    

    /**
     * 异步的Post请求
     * @param urlStr
     * @param params
     * @param callBack
     * @throws Exception
     */
    public static void doPostAsyn(final String urlStr, final String params,
                                  final CallBack callBack) 
        new Thread(new Runnable() 
            @Override
            public void run() 
                try 
                    String result = doPost(urlStr, params);
                    if (callBack != null) 
                        callBack.onRequestComplete(result);
                    
                 catch (Exception e) 
                    e.printStackTrace();
                
            
        ).start();
    


    /**
     * Get请求，获得返回数据
     *
     * @param urlStr
     * @return
     * @throws Exception
     */
    public static String doGet(String urlStr) 
        URL url = null;
        HttpURLConnection conn = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try 
            url = new URL(urlStr);
            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
            conn.setRequestMethod("GET");
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            if (conn.getResponseCode() == 200) 
                is = conn.getInputStream();
                baos = new ByteArrayOutputStream();
                int len = -1;
                byte[] buf = new byte[1024];
                while ((len = is.read()) != -1) 
                    baos.write(buf, 0, len);
                
                baos.flush();
                return baos.toString();
             else 
                throw new RuntimeException(" responseCode is not 200 ... ");
            
         catch (MalformedURLException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
         finally 
            try 
                if (is != null)
                    is.close();
             catch (IOException e) 
                e.printStackTrace();
            
            try 
                if (baos != null)
                    baos.close();
             catch (IOException e) 
                e.printStackTrace();
            
            conn.disconnect();
        
        return null;
    

    /**
     * 向指定 URL 发送POST方法的请求
     * @param url 发送请求的 URL
     * @param param  请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     * @throws Exception
     */
    public static String doPost(String url, String param) 
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try 
            URL realUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            conn.setRequestProperty("charset", "utf-8");
            conn.setUseCaches(false);
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
            if (param != null && !param.trim().equals("")) 
                // 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) 
            e.printStackTrace();
        
        // 使用finally块来关闭输出流、输入流
        finally 
            try 
                if (out != null) 
                    out.close();
                
                if (in != null) 
                    in.close();
                
             catch (IOException ex) 
                ex.printStackTrace();
            
        
        return result;