求高手指导下面代码的意思
<%
Map<String,String[]> map=
request.getParameterMap();
Set<Map.Entry<String,String[]>>
set=map.entrySet();
for(Map.Entry<String,String[]> entry:set){
String name1=entry.getKey();
String value=Arrays.toString(entry.getValue());
out.print(name1+":"+value);
out.print("<br>");
}
%>