HttpServletRequest中的取得body的方法有两种：getInputStream()、getReader()。
但是这个两个方法只能用一次，取第二次的时候就会变为null，然而
HttpServletRequest中的body二进制还是有的，感觉特别奇怪，
原因可能是游标的变动，
HttpServletRequest第一次取body时游标以跑到二进制流的尾部，然后第二次去的时候就取不到了，解决方法如下：
重写HttpServletRequestWrapper
public class BodyReaderHttpServletRequestWrapper extends
HttpServletRequestWrapper {
private byte[] body;
public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
String charset = request.getCharacterEncoding();
if (StringUtils.isNullOrEmpty(charset)) {
charset = “utf-8”;
}
try {
body = StreamUtil.readBytes(request.getReader(), charset);
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream bais = new ByteArrayInputStream(body);
return new ServletInputStream() {
@Override
public int read() throws IOException {
return bais.read();
}
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener readListener) {
}
};
}
然后 ServletRequest requestWrapper
= new BodyReaderHttpServletRequestWrapper((HttpServletRequest)；
之后用
requestWrapper就可随便去body值了。