首先贴出原文地址，尊重原作者
http://blog.csdn.net/zxygww/article/details/47045055
注意：下面方法已验证通过。
HTTP请求中的是字符串数据：

//字符串读取
void charReader(HttpServletRequest request) {
    BufferedReader br = request.getReader();
    String str, wholeStr = "";
    while((str = br.readLine()) != null){
    wholeStr += str;
}
System.out.println(wholeStr);
}
//二进制读取
void binaryReader(HttpServletRequest request) {
    int len = request.getContentLength();
    ServletInputStream iii = request.getInputStream();
    byte[] buffer = new byte[len];
    iii.read(buffer, 0, len);
}

注意：

request.getInputStream();
request.getReader();
和request.getParameter("key");
这三个函数中任何一个函数执行一次后（可正常读取body数据），之后再执行就无效了。

从HttpServletRequest中得到完整的请求URL

String getFullURL(HttpRequest request) {

 StringBuffer url = request.getRequestURL();
 if (request.getQueryString() != null) {
  url.append(’?’);
  url.append(request.getQueryString());
 }
 return url.toString();
}