Question

如何使用POST上传的二进制数据

Answer 1

这个不就是文件上传嘛
给你个servlet3.0的文件上传
页面表单
<form action="sf" enctype="multipart/form-data" method="get">
username: <input type="text" name="username" /><br>
file: <input type="file" name="filename" /><br>
<input type="submit" value="Submit" />
</form>

servlet头注解配置

@WebServlet("/sf")
@MultipartConfig
public class SingleFileUpload extends HttpServlet {

doPost 方法
Java code
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Enumeration<String> heads = request.getHeaderNames();
System.out.println("request.getHeaderNames()");
while (heads.hasMoreElements()) {
String header = heads.nextElement();
System.out.println(header + "=" + request.getHeader(header));
}
Part part = request.getPart("filename");
Collection<String> headerNames = part.getHeaderNames();
System.out.println("part.getHeaderNames()");
for (String header : headerNames) {
System.out.println(header + "=" + part.getHeader(header));
}
InputStream is = part.getInputStream();
String filename = new String(getFilename(part).getBytes(), "UTF-8");
File file = new File("D:\\fileupload");
if (!file.exists() || !file.isDirectory()) {
file.mkdir();
}

FileOutputStream fos = new FileOutputStream(new File(file + File.separator + filename));
byte[] buf = new byte[1024];
while (is.read(buf) != -1) {
fos.write(buf);
}
fos.flush();
fos.close();
is.close();
PrintWriter out = response.getWriter();
out.println("file upload success");
}

public String getFilename(Part part) {
String contentDispositionHeader = part.getHeader("content-disposition");
String[] elements = contentDispositionHeader.split(";");
for (String element : elements) {
if (element.trim().startsWith("filename")) {
return element.substring(element.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
}

Answer 2

可使用android自带的httpclient框架实现向服务器发起get或post请求，以下为完整的示例代码：
1. GET 方式传递参数
//先将参数放入List，再对参数进行URL编码
List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "数据")); //增加参数1
params.add(new BasicNameValuePair("param2", "value2"));//增加参数2
String param = URLEncodedUtils.format(params, "UTF-8");//对参数编码
String baseUrl = "服务器接口完整URL";
HttpGet getMethod = new HttpGet(baseUrl + "?" + param);//将URL与参数拼接
HttpClient httpClient = new DefaultHttpClient();