Enumeration和Map
Enumeration enu = request.getParameterNames();
while(enu.hasMoreElements()){
String paramName = (String)enu.nextElement();
}

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Map<String, String[]> paramMap = request.getParameterMap();
Set<Map<String, String[]>> entries = paramMap.entrySet();
for(Iterator<Map<String, String[]>> it = entries.iterator(); it.hasNext(); ){
Map<String, String[]> entry = it.next();
String paramName = entry.getKey();
String[] paramValue = entry.getValue();
}