struts2基本知识点（Struts2 basic knowledge points）.docVIP

struts2基本知识点（Struts2 basic knowledge points） The kernel controller is configured in the web.xml file filter filter-namestruts/filter-name filter-classorg.apache.struts2.dispatcher.FilterDispatcher/filter-class /filter filter-mapping filter-namestruts/filter-name url-pattern/*/url-pattern /filter-mapping Data transmission You can define the set method in the Action to get the value of the property from the request (you can define the object in an automatic way to encapsulate it), The ValueStack object encapsulates all of the output information, somewhat similar to the Map structure, but stronger than the Map structure (which can be obtained by expressions) can be obtained in the following manner ValueStack vs = request.getAttribute (struts.valueStack); You can get the specific information vs.findValue () by its findValue () method; Direct access to ${..} through EL expression through the Struts2 label s:property value= . / , also can directly through the request object Type conversion (rarely used) The type conversion class needs to inherit the DefaultTypeConverter class from the write convertValue () method Three parameters: Map context stands for context Object value if a string is converted to an object, the representation is an array of strings, otherwise the transformation object is represented Class toType indicates the direction of the transformation Define the location of the resource file: placed under the Action corresponding package Rule name: the Action class name in the property that needs to be converted. -conversion Key-value rule: the property name that needs to be converted in key:Action, the full pathname of the name value: conversion class The local type conversion is defined here. To define global type conversion, the resource file is located below SRC Rule of naming: xwork-conversion Key-value rule: the full path of the class that key: is converted to, such as com.zrs.bean.Point value:, and the same as above Get ServletAPI in Struts2s Action 1: g