由网友(~綄镁の恋づ)分享简介：我想要得到的内容大小 request.getContentLength（）服务器端JSP页面。但request.getContentLength（）始终返回-1，我不为什么？Android的代码片段code：URL URI =新的URL（actionUrl）;HttpURLConnection的康恩=（HttpUR...

我想要得到的内容大小 request.getContentLength（）服务器端JSP页面。 但request.getContentLength（）始终返回-1，我不为什么？

Android的代码片段code：

  URL URI =新的URL（actionUrl）;
HttpURLConnection的康恩=（HttpURLConnection类）uri.openConnection（）;
//conn.setChunkedStreamingMode(100）;
conn.setConnectTimeout（setTimeout的大于0的setTimeout：timeoutConnection？）;
conn.setReadTimeout（setTimeout的大于0的setTimeout：timeoutConnection？）;
conn.setDoInput（真正的）;
conn.setDoOutput（真正的）;
conn.setUseCaches（假）;
conn.setRequestMethod（POST）;
conn.setRequestProperty（连接，保持活动）;

//conn.setRequestProperty("content-length，10）;
//conn.addRequestProperty("content-length，20）;
conn.setFixedLengthStreamingMode（30）;

conn.setRequestProperty（Charsert，编码）;
conn.setRequestProperty（内容类型，多部分/表单数据
                +;边界=+ java.util.UUID.randomUUID（）的toString（））;
conn.connect（）;
 

解决方案

正在使用 conn.setChunkedStreamingMode（100），这将有效地使块传输编码在100字节的块，当内容lenght是未知的提前。

使用 conn.setFixedLengthStreamingMode（INT LEN），如果​​你事先知道你要发送的请求体内容的长度。

I want to get content size by request.getContentLength() in server client JSP page. But request.getContentLength() always return -1, i do not why?

Android snippet code:

URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
//conn.setChunkedStreamingMode(100);
conn.setConnectTimeout(setTimeOut>0?setTimeOut:timeoutConnection);
conn.setReadTimeout(setTimeOut>0?setTimeOut:timeoutConnection);  
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "keep-alive");

//conn.setRequestProperty("content-length", "10");
//conn.addRequestProperty("content-length", "20");
conn.setFixedLengthStreamingMode(30);

conn.setRequestProperty("Charsert", ENCODING);
conn.setRequestProperty("Content-Type", "multipart/form-data"
                + ";boundary=" + java.util.UUID.randomUUID().toString());
conn.connect();

解决方案

You are using conn.setChunkedStreamingMode(100) that will effectively enable the chunked transfer encoding in chunks of 100 bytes when the content-lenght is unknown in advance.

Use conn.setFixedLengthStreamingMode(int len) if you know in advance the length of the content you are going to send in the body of the request.