HttpServletRequest中读取HTTP请求的body

void charReader(HttpServletRequest request) {
    BufferedReader br = request.getReader();

    String str, wholeStr = "";
    while((str = br.readLine()) != null){
        wholeStr += str;
}
System.out.println(wholeStr);

}

void binaryReader(HttpServletRequest request) {
        int len = request.getContentLength();
        ServletInputStream iii = request.getInputStream();
        byte[] buffer = new byte[len];
        iii.read(buffer, 0, len);
}