取得 HTTP post 的 body

要取得 HTTP POST 的 body 可以使用 ServletRequest interface 的兩個方法: 

<a href="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedReader.html" title="class or interface in java.io">BufferedReader</a> <b><a href="http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletRequest.html#getReader%28%29">getReader</a></b>()
          Retrieves the body of the request as character data using a BufferedReader.

ServletInputStream

getInputStream()           Retrieves the body of the request as binary data using a ServletInputStream.

getReader() 方法用於字元資料， getInputStream() 方法用於 binary data