Android:java.lang.IllegalStateException:已经连接

Question

我正在测试一个代码示例,但它总是出错 connection.setDoInput(true);

HttpsURLConnection connection = null;
DataOutputStream outputStream = null;
DataInputStream inputStream = null;

String urlServer = "https://www.myurl.com/upload.php";
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";

int bytesRead = 0;
int bytesAvailable = 0;
int bufferSize = 0;
byte[] buffer = null;
int maxBufferSize = 1*1024*1024;

try {
    FileInputStream fileInputStream = new FileInputStream(new File(params[0]));

    URL url = new URL(urlServer);

    connection = (HttpsURLConnection) url.openConnection();
    connection.setConnectTimeout(1000);

    // Allow Inputs & Outputs
    connection.setDoInput(true);
    connection.setDoOutput(true);
    connection.setUseCaches(false);

    // Enable POST method
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

    connection.setConnectTimeout(1000);

    outputStream = new DataOutputStream(connection.getOutputStream());
    outputStream.writeBytes(twoHyphens + boundary + lineEnd);
    outputStream.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + params[0] + "\"" + lineEnd);
    outputStream.writeBytes(lineEnd);

    bytesAvailable = fileInputStream.available();
    bufferSize = Math.min(bytesAvailable, maxBufferSize);
    buffer = new byte[bufferSize];

    // Read file
    bytesRead = fileInputStream.read(buffer, 0, bufferSize);

    while (bytesRead > 0) {
        outputStream.write(buffer, 0, bufferSize);
        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
    }

    outputStream.writeBytes(lineEnd);
    outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

错误日志是java.lang.IllegalStateException: Already connected.我试过这些,但没有一个工作:

connection.setRequestProperty("Connection", "close");
connection.disconnect();
connection.setConnectTimeout(1000);

编辑:即使我没有打电话connection.connect(),它仍然会给出同样的错误already connected.

Answer 1

移动

connection.connect();

后

connection.setRequestMethod("POST");