HttpURLConnection的速度很慢 [英] HttpURLConnection very slow

问题描述

任何人都可以发现为什么这大约需要20秒？
我运行下面的code张贴JSON请求到本地服务器192.168.1.127。

  

卷曲-H内容类型：应用程序/ JSON-X POST
  HTTP：// 192.168.1.127:8080/bed -d
  '{\"command\":{\"value\":3.012,\"set\":\"target_$p$pssure_voltage\"},\"id\":2002,\"side\":\"left\",\"role\":\"command\"}'

在服务器运行相同的方块卷曲是即时的，并且服务器不抱怨。

从Android浏览器的GET请求快。我已经试过两次与OS 4.x版本的Andr​​oid设备

这个问题没有帮助，据我可以告诉：
的Andr​​oid HttpURLConnection的速度很慢

con.getInputStream（），大约需要20秒：

 字符串httpJson（字符串URL，JSONObject的工作）{
    字符串RET = NULL;
        HttpURLConnection类CON = httpJsonCon（URL）;
        如果（CON！= NULL）
            httpJsonCon（CON，网址，工作）;
    返回RET;} HttpURLConnection的mkCon（字符串URL）{
    HttpURLConnection类CON = NULL;
    URL U = NULL;
    尝试{
        U =新的URL（网址）;
        CON =（HttpURLConnection类）（u.openConnection（））;        con.setRequestMethod（POST）;
        con.setUseCaches（假）;
        con.setRequestProperty（内容类型，应用/ JSON）;
        con.setRequestProperty（接受，text / plain的）;
        con.setRequestProperty（接受，应用/ JSON）;
        con.setDoOutput（真）;
        con.setDoInput（真）;
        con.connect（）;    }赶上（例外五）{
        Log.w（TAG，E =+ e）条;
        如果（CON！= NULL）
            con.disconnect（）;        CON = NULL;
    }    返回CON;
}字符串sendJson（HttpURLConnection类骗子，JSONObject的工作）{
    字符串RET = NULL;
    如果（CON == NULL）{
        返回RET;
    }    尝试{
        最后弦乐toWriteOut = job.toString（）;        最终作家出=新OutputStreamWriter（新的BufferedOutputStream（
                con.getOutputStream（）），UTF-8）;
        out.write（toWriteOut）;
        了out.flush（）;
        //con.getInputStream（），大约需要20秒：
        在=新的BufferedReader（新的InputStreamReader（con.getInputStream（）））最终的BufferedReader;    }赶上（IOException异常五）{        Log.d（TAG，E =+ e）条;        RET = NULL;
    } {最后
        如果（CON！= NULL）
            con.disconnect（）;
    }    返回RET;}
 

解决方案

添加请求头指定的帖子内容长度。

  con.setRequestProperty（内容长度，+ json.length（））;
 

Can anyone spot why this takes ~20 sec? I am running the code below to post a JSON request to a local server 192.168.1.127.

curl -H "Content-type: application/json" -X POST http:// 192.168.1.127:8080/bed -d '{"command":{"value":3.012,"set":"target_pressure_voltage"},"id":2002,"side":"left","role":"command"}'

curl on the same box where the server is running is instant and the server does not complain.

A get request from the Android browser is fast. I have tried two Android devices with os version 4.x.

This question does not help as far as I can tell: Android HttpURLConnection VERY slow

con.getInputStream() Takes ~20 sec:

    String httpJson(String url, JSONObject job) {
    String ret = null;      
        HttpURLConnection con = httpJsonCon(url);
        if(con!=null)
            httpJsonCon(con, url,job);      
    return ret;

}



 HttpURLConnection mkCon(String url) {
    HttpURLConnection con = null;
    URL u = null;
    try {
        u = new URL(url);
        con = (HttpURLConnection) (u.openConnection());

        con.setRequestMethod("POST");
        con.setUseCaches(false);
        con.setRequestProperty("Content-Type", "application/json");
        con.setRequestProperty("Accept", "text/plain");
        con.setRequestProperty("Accept", "application/json");
        con.setDoOutput(true);
        con.setDoInput(true);
        con.connect();

    } catch (Exception e) {
        Log.w(TAG, " e= " + e);
        if(con!=null)
            con.disconnect();

        con = null;
    }

    return con;
}

String sendJson(HttpURLConnection con, JSONObject job) {
    String ret = null;
    if(con==null){
        return ret;
    }

    try {
        final String toWriteOut = job.toString();

        final Writer out = new OutputStreamWriter(new BufferedOutputStream(
                con.getOutputStream()), "UTF-8");
        out.write(toWriteOut);
        out.flush();
        //con.getInputStream() Takes ~20 sec:
        final BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));  



    } catch (IOException e) {

        Log.d(TAG, " e= " + e);

        ret = null;
    } finally {
        if(con!=null)
            con.disconnect();
    }

    return ret;

}

解决方案

Add a request header that specifies the post content length.

con.setRequestProperty("Content-Length", "" + json.length());

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