WebWork2源码分析续一

public class ParametersInterceptor extends AroundInterceptor {

//~ Methods ////////////////////////////////////////////////////////////////

protected void after(ActionInvocation dispatcher, String result) throws Exception {

}

protected void before(ActionInvocation invocation) throws Exception {

if (!(invocation.getAction() instanceof NoParameters)) {

final Map parameters = ActionContext.getContext().getParameters();

//用于获取Map 结构中的Parameters

if (log.isDebugEnabled()) {

log.debug("Setting params " parameters);

}

ActionContext invocationContext = invocation.getInvocationContext();

try {

invocationContext.put(InstantiatingNullHandler.CREATE_NULL_OBJECTS, Boolean.TRUE);