filter dispatcher_EncodingFilter

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FilterDispatcher的作用

1.用来装载配置和设置静态资源的package

public void init(FilterConfig filterConfig) throws ServletException {

         init();

         String param = filterConfig.getInitParameter(“packages”);

         String packages = “org.apache.struts2.static template org.apache.struts2.interceptor.debugging”;

        if (param != null) {

             packages = param + ” ” + packages;

         }

        this.pathPrefixes = parse(packages);

     }

public void init() {

        if (configurationManager == null) {

             configurationManager = new ConfigurationManager(BeanSelectionProvider.DEFAULT_BEAN_NAME);//用来初始化ConfigurationManager

         }

         init_DefaultProperties(); // org.apache.struts2.default.properties配置的provider初始化

         init_TraditionalXmlConfigurations(); // struts-default.xml,struts-plugin.xml,struts.xml配置的provider初始化

         init_LegacyStrutsProperties(); //

         init_ZeroConfiguration(); //

         init_CustomConfigurationProviders(); //

         init_MethodConfigurationProvider();

         init_FilterInitParameters() ; //

         init_AliasStandardObjects() ; //

         Container container = init_PreloadConfiguration();

         init_CheckConfigurationReloading(container);

         init_CheckWebLogicWorkaround(container);

}

2.包装转换请求

1     public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

2

3

4          HttpServletRequest request = (HttpServletRequest) req;

5          HttpServletResponse response = (HttpServletResponse) res;

6          ServletContext servletContext = getServletContext();

7 ………………………………

8              request = prepareDispatcherAndWrapRequest(request, response);//作些编码准备和为了上传文件作包装

9              ActionMapping mapping= actionMapper.getMapping(request, getConfigurationManager()); // 把请求和配置文件挂勾

10

11

12 ……………………………………

13           serviceAction(request, response, servletContext, mapping);//创建Action上下文，根据给定的mapping装载ActionProxy,然后指定的Action方法被执行，输出进入response

14

15            ActionContextCleanUp.cleanUp(req);//

16       ………………

17      }

18