Android – 将字节数组写入OutputStreamWriter

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我有一个通过Web服务上传照片的应用程序.过去,我将文件加载到流中,然后转换为Base64.然后我通过OutputStreamWriter的write()方法发布了结果字符串.现在,Web服务已经改变,它期望multipart / form-data,它不期望Base64.

所以不知怎的,我需要在没有转换的情况下发布此文件的chararters.我确定我很接近,但我得到的只是内容长度下溢或溢出.奇怪的是,在调试器中,我可以看到我的缓冲区长度与我发布的字符串的长度相同.这是我正在做的事情,希望足够的代码

  1. // conn is my connection
  2. OutputStreamWriter dataStream = new OutputStreamWriter(conn.getOutputStream());
  3.  
  4. // c is my file
  5. int bytesRead = 0;
  6. long bytesAvailable = c.length();
  7.  
  8. while (bytesAvailable > 0) {
  9. byte[] buffer = new byte[Math.min(12288,(int)bytesAvailable)];
  10. bytesRead = fileInputStream.read(buffer,Math.min(12288,(int)bytesAvailable));
  11.  
  12. // assign the string if needed.
  13. if (bytesRead > 0) {
  14. bytesAvailable = fileInputStream.available();
  15.  
  16. // I've tried many encoding types here.
  17. String sTmp = new String(buffer,"ISO-8859-1");
  18. // HERE'S the issue. I can't just write the buffer,dataStream.write(sTmp);
  19. dataStream.flush();
  20. // Yes there's more code,but this should be enough to show why I don't know what I'm doing!

解决方法

更改
  1. OutputStreamWriter dataStream = new OutputStreamWriter(conn.getOutputStream());

有了这个

  1. DataOutputStream dataStream = new DataOutputStream(conn.getOutputStream());

并直接调用dataStream.write(buffer);

让我知道它是如何表现的

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