Question

我实现了android代码，将JSON字符串发送到服务器。我在doInBackground方法中将此json字符串'{"mac": "23:A5:J0:06:C6:E9", "latitude":84.16898451,"longitude":3.16561387,"route": 1}'作为输出，并在客户端获取输出getResponsecode：The output of getResponsecode: 200的输出。

我在localhost中检查了我的php文件，当我刷新index.php主页时，如果我更改JSON字符串中的某些值，则会创建总线表并更新数据。我无法直接将我的S4设备连接到localhost，因为我正在使用公共热点。

我已将index.php文件上传到byethost.com服务器上htdocs目录中的在线文件管理器，正在创建表总线，但没有插入记录然后更新。

是否可以使用HttpURLConnection检查数据是否已在bus表中成功插入/更新？我应该为file_get_contents方法php://input的第一个参数添加另一个路径吗？

doInBackground方法：

protected Void doInBackground(String... params) {
    // TODO Auto-generated method stub

    try {
        System.out.println("The output of : doInBackground " +params[0]);

        URL myUrl = new URL("http://username.byethost8.com/index.php");
        HttpURLConnection conn = (HttpURLConnection) myUrl
                .openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.setConnectTimeout(10000);
        conn.setReadTimeout(10000);
        conn.setRequestProperty("Content-Type",
                "application/json");
        conn.connect();
        System.out.println("The output of getResponsecode: "+conn.getResponseCode());
        // create data output stream
        DataOutputStream wr = new DataOutputStream(
                conn.getOutputStream());
        // write to the output stream from the string
        wr.writeBytes(params[0]);
        wr.close();

    } catch (IOException e) {

        e.printStackTrace();
    }
    return null;

}

的index.php：

    <?php
     $json = json_decode ( file_get_contents ( 'php://input', true ) );
     $con = new mysqli ( "domain.com", "user_name", "password", "database_name" );
    // I tried with this string to test the index.php file and everything works
// $json = '{"mac": "23:A5:J0:06:C6:E9", "latitude":84.16898451,"longitude":3.16561387,"route": 1}';

    $data = json_decode ( $json );

    $mac = $data->{'mac'};
    $latitude = $data->{'latitude'};
    $longitude = $data->{'longitude'};
    $route =   $data->{'route'};


    require 'connection.php';

    // check whether route's table exist.
    $results = $con->query ( "SHOW TABLES like 'bus' " ) or die ( mysqli_error () );

    if (($results->num_rows) == 1) {
      //"UPDATE MyGuests SET lastname='Doe' WHERE id=2"
     $sql = "REPLACE INTO bus(mac, route, latitude, longitude)
              VALUES( ?, ?, ? , ? )";
      $stmt = $con->prepare($sql) or die ( $con->error );
      $stmt->bind_param("ssss",$mac,$route, $latitude,$longitude);
      $stmt->execute();

      $stmt->close();

      echo "Table exist";
    } else {
      $create =  "CREATE TABLE bus
           (id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
            mac VARCHAR(30) NOT NULL UNIQUE,
            route int(11) NOT NULL,
         latitude FLOAT(10,6) NOT NULL , 
         longitude FLOAT(10,6) NOT NULL,
         created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)" ;
       $stmt = $con->prepare($create) or die ( $con->error );
      $stmt->execute();

      $stmt->close();

      echo "table was created";
    }

一些Logcat输出：

04-29 22:18:28.541: W/System.err(32348): java.net.ProtocolException: cannot write request body after response has been read
04-29 22:18:28.541: W/System.err(32348):  at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:214)
04-29 22:18:28.551: W/System.err(32348):  at com.bustracker.MyAsyncTask.doInBackground(PostData.java:61)
04-29 22:18:28.551: W/System.err(32348):  at com.bustracker.MyAsyncTask.doInBackground(PostData.java:1)
04-29 22:18:28.551: W/System.err(32348):  at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-29 22:18:28.551: W/System.err(32348):  at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-29 22:18:28.551: W/System.err(32348):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-29 22:18:28.551: W/System.err(32348):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-29 22:18:28.551: W/System.err(32348):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-29 22:18:28.551: W/System.err(32348):  at java.lang.Thread.run(Thread.java:818)
04-29 22:18:28.561: I/System.out(32348): The output of : doInBackground {"mac":"89:GG:D0:06:86:M6","latitude":93.86900553,"longitude":25.66558334,"route":4}
04-29 22:18:28.591: I/System.out(32348): (HTTPLog)-Static: isSBSettingEnabled false
04-29 22:18:28.591: I/System.out(32348): KnoxVpnUidStorageknoxVpnSupported API value returned is false

Answer 1

您在输入中使用了两次json_decode()。

您的语句cannot write request body after response has been read导致IOException System.out.println("The output of getResponsecode: "+conn.getResponseCode());。如果你还没发送任何内容，你不能要求回复。或者更好：在声明之后你不能再写任何东西了。把这句话放在wr.close()之后。然后阅读回复表格conn.getInputStream()。

HttpURLConnection检查JSON字符串是否已成功插入mysql

1 个答案: