如何使用WebDAV更新服務器資源

Question

我正在編寫一個Android應用程序，其中使用了Jackrabbit WebDAV庫。

在這個WebDAV庫的幫助下，我可以下載和上傳文件到服務器。這按預期工作。

現在我想從文件中獲取具有特定偏移量的字節數組。對此我試過的是：

byte buffer[] = null; 
Log.d(TAG, "downloadBytes '" + fileUri + "' byteOffset '" + byteOffset + "' byteOffset '" + byteCount); 
HttpClient httpClient = new HttpClient(); 

GetMethod httpMethod = new GetMethod(fileUri); 

httpMethod.addRequestHeader("Accept-Ranges", "bytes"); 
int total = byteOffset + byteCount; 
String bytesMessage = "bytes=" + byteOffset + "-" + total; 
Log.d(TAG, "bytesMessage " + bytesMessage); 

httpMethod.addRequestHeader("Range", bytesMessage); 
httpMethod.addRequestHeader("Cache-Control", "no-cache, no-store"); 

httpClient.executeMethod(httpMethod); 

這個按預期工作。

同樣，我想通過指定偏移量來更新服務器上的字節數組文件，但這似乎不起作用;該服務器返回一個400錯誤請求錯誤代碼。

byte buffer[] = {0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x50}; 
Log.d(TAG, "downloadBytes '" + fileUri + "' byteOffset '" + byteOffset + "' byteCount '" + byteCount); 
HttpClient httpClient = new HttpClient(); 


PutMethod httpMethod = new PutMethod(fileUri); 

httpMethod.addRequestHeader("Accept-Ranges", "bytes"); 
int total = byteOffset + byteCount; 
String bytesMessage = "bytes=" + byteOffset + "-" + total; 
Log.d(TAG, "bytesMessage " + bytesMessage); 

httpMethod.addRequestHeader("Range", bytesMessage); 
httpMethod.addRequestHeader("Cache-Control", "no-cache, no-store"); 
httpMethod.addRequestHeader("Overwrite", "T"); 

InputStream is = new ByteArrayInputStream(buffer); 
RequestEntity requestEntity = new InputStreamRequestEntity(is, "text/plain"); 
httpMethod.setRequestEntity(requestEntity); 

httpClient.executeMethod(httpMethod); 

我在請求頭中缺少什麼？

Answer 1

以下是正確的頭，使用此我與偏移和字節長度能夠更新WebDAV服務器資源。

 HttpClient httpClient = new HttpClient(); 

     PutMethod httpMethod = new PutMethod(fileUri); 
     httpMethod.addRequestHeader("Accept-Ranges", "bytes"); 
     int total = byteOffset + byteCount; 
     int range = total-1; 

     String rangeMessage = "bytes=" + byteOffset +"-" + range; 
     Log.d(TAG, "rangeMessage " + rangeMessage); 

     String lengthMessage = Integer.toString(byteCount); 
     String contentRangeMessage = "bytes " + byteOffset +"-" + range + "/*"; 

     Log.d(TAG, "contentRangeMessage " + contentRangeMessage); 
     Log.d(TAG, "lengthMessage " + lengthMessage); 

     httpMethod.addRequestHeader("Content-Length", lengthMessage); 
     httpMethod.addRequestHeader("Content-Range", contentRangeMessage); 
     httpMethod.addRequestHeader("Cache-Control", "no-cache, no-store"); 
     httpMethod.addRequestHeader("Overwrite", "T");