Hi All
The following code gets the client IP address using reflection. Not very
pretty, but it works fine unless you install a security manager. It will
also break if the Jetspeed implementation undergoes a major revision. But
for now, in the absence of anything more elegant, it works.
public static void printRemoteAddr(RenderRequest request) {
try {
String remoteAddr = (String) findField(request,
"requestContext.servletRequest.request.request.remoteAddr");
System.out.println("Remote addr: " + remoteAddr);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Find the value of a field that you normally do not have access to using
reflection.
* The field may have a protected, package or private access modifier.
*
* @param obj The object instance to start with
* @param fieldName The name of the field in "request.remoteAddr" format
* @return The field value
* @throws IllegalArgumentException Field does not exist
* @throws IllegalAccessException Security manager threw you out
*/
public static Object findField(Object obj, String fieldName)
throws IllegalArgumentException, IllegalAccessException {
// Step through the path to the field
String[] tokens = fieldName.split("\\.");
for (String token : tokens) {
// Iterate up the inheritance hierarchy
boolean found = false;
Class<?> clazz = obj.getClass();
while (clazz != null && !found) {
try {
Field field = clazz.getDeclaredField(token);
found = true;
field.setAccessible(true);
obj = field.get(obj);
} catch (NoSuchFieldException nsfex) {
clazz = clazz.getSuperclass();
}
}
if (!found)
throw new IllegalArgumentException(token + " is not a field in class "
+ obj.getClass().getName());
}
return obj;
}
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