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我尝试在 URLConnection 类的帮助下写入一个文件,这是一个带有 url 的共享文件,主要是在连接的 OutputStream 的帮助下。因此,我为该文件编写了新的正文并将其放在流中。但文件没有改变。你能给我一些提示或代码或教程来解决我的问题吗?

我的程序看起来像这样

connectionWrite = (HttpURLConnection) new URL(locationFile).openConnection();  

                connectionWrite.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");  
                connectionWrite.setDoOutput(true);  
                connectionWrite.setUseCaches(false); 
                ((HttpURLConnection) connectionWrite).setRequestMethod("POST");
                connectionWrite.setRequestProperty("Content-Type", "MultiPart/Form-Data");  
                //connectionWrite.setRequestProperty("Connection", "Keep-Alive");

                byte bytes[] = String.valueOf(stamp).getBytes();  
                connectionWrite.setRequestProperty("Content-length", "" + bytes.length);  
                connectionWrite.connect();  
                OutputStream out = connectionWrite.getOutputStream();  
                out.write(bytes);  
                out.flush();  
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