JAVA获取POST请求的请求头信息

public static byte[] getRequestPostBytes(HttpServletRequest request)
throws IOException {
int contentLength = request.getContentLength();
if(contentLength<0){
return null;
}
byte buffer[] = new byte[contentLength];
for (int i = 0; i < contentLength;) {

int readlen = request.getInputStream().read(buffer, i,
contentLength - i);
if (readlen == -1) {
break;
}
i += readlen;
}
return buffer;
}

/**
* 描述:获取 post 请求内容
* <pre>
* 举例：
* </pre>
* @param request
* @return
* @throws IOException
*/
public static String getRequestPostStr(HttpServletRequest request)
throws IOException {
byte buffer[] = getRequestPostBytes(request);
String charEncoding = request.getCharacterEncoding();
if (charEncoding == null) {
charEncoding = "UTF-8";
}
return new String(buffer, charEncoding);
}

/**
* 描述:获取请求头内容
*/
private String getHeadersInfo(HttpServletRequest request) {
Map<String, String> map = new HashMap<String, String>();
Enumeration headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements()) {
String key = (String) headerNames.nextElement();
String value = request.getHeader(key);
map.put(key, value);
}

String result="";
for (String key : map.keySet()) {
//System.out.println("key= "+ key + " and value= " + map.get(key));
result = result + "key= "+ key + " and value= " + map.get(key)+"\n";
}
return result;
}