java - DataOutputStream 给我一个 'java.io.IOException: unexpected end of stream' ？

Question

我正在尝试使用 HttpUrlConnection 从 Android 应用程序向 Web 服务发出请求。但有时有效，有时无效。

当我尝试发送这个值时:

JSON 值

 {"Calle":"Calle Pérez 105","DetalleDireccion":"","HoraPartida":"May 18, 2014 9:17:10 AM","Numero":0,"PuntoPartidaLat":18.477295994621315,"PuntoPartidaLon":-69.93638522922993,"Sector":"Main Sector"}

我在 DataOutputStream 关​​闭函数中遇到“流的意外结束”异常。

这是我的代码:

DataOutputStream printout;
// String json;
byte[] bytes;
DataInputStream input;

URL serverUrl = null;
try {
    serverUrl = new URL(Config.APP_SERVER_URL + URL);
} catch (MalformedURLException e) {
    ...
} 

bytes = json.getBytes();
try {

    httpCon = (HttpURLConnection) serverUrl.openConnection();
    httpCon.setDoOutput(true);
    httpCon.setUseCaches(false);
    httpCon.setFixedLengthStreamingMode(bytes.length);
    httpCon.setRequestProperty("Authorization", tokenType + " "+ accessToken);
    httpCon.setRequestMethod("POST");
    httpCon.setRequestProperty("Content-Type", "application/json");

    printout = new DataOutputStream(httpCon.getOutputStream());
    printout.writeBytes(json);
    printout.flush();
    printout.close();
    ...
}

Answer 1

这是一个具有以下更改的解决方案:

• 它摆脱了 DataOutputStream，这肯定是错误的使用。
• 它正确设置并传送了内容长度。
• 它不依赖于任何关于编码的默认值，而是在两个地方明确设置 UTF-8。

试一试:

// String json;

URL serverUrl = null;
try {
    serverUrl = new URL(Config.APP_SERVER_URL + URL);
} catch (MalformedURLException e) {
    ...
} 

try {
    byte[] bytes = json.getBytes("UTF-8");

    httpCon = (HttpURLConnection) serverUrl.openConnection();
    httpCon.setDoOutput(true);
    httpCon.setUseCaches(false);
    httpCon.setFixedLengthStreamingMode(bytes.length);
    httpCon.setRequestProperty("Authorization", tokenType + " "+ accessToken);
    httpCon.setRequestMethod("POST");
    httpCon.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

    OutputStream os = httpCon.getOutputStream();
    os.write(bytes);
    os.close();

    ...
}