servlet获取body参数

要在Servlet中获取HTTP请求的Body参数，需要使用request.getInputStream()方法获取请求的输入流，然后从流中读取参数。以下是一个获取Body参数的示例代码：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    StringBuilder stringBuilder = new StringBuilder();
    BufferedReader bufferedReader = null;
    try {
        InputStream inputStream = request.getInputStream();
        if (inputStream != null) {
            bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        } else {
            stringBuilder.append("");
        }
    } catch (IOException ex) {
        throw ex;
    } finally {
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException ex) {
                throw ex;
            }
        }
    }
    String body = stringBuilder.toString();
    // 对body进行处理
}

在这个示例中，我们使用了BufferedReader来从输入流中读取参数，并将读取到的字符添加到StringBuilder中。最后，我们将StringBuilder转换为一个字符串，以获取请求Body中的参数。