本文主要通过三个方面给大家介绍webwork action调用相关知识，三个方面分别是：
1.这部分框架类关系
2.Webwork 获取和包装 web 参数
3.DefaultActionProxyFactory、DefaultActionProxy、DefaultActionInvocation
一路走来，终于要开始 webwork 核心业务类的总结，webwork 通过对客户端传递的 web 参数重新包装，进行执行业务 Action 类，并反馈执行结果，本篇源码分析对应下图 WebWork 框架流转图中红色框的地方。
1.这部分框架类关系
2.Webwork 获取和包装 web 参数
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public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException {
try {
if (encoding != null) {
try {
request.setCharacterEncoding(encoding);
} catch (Exception localException) {
}
}
if (locale != null) {
response.setLocale(locale);
}
if (this.paramsWorkaroundEnabled) {
request.getParameter("foo");
}
request = wrapRequest(request); //封装 request请求
serviceAction(request, response, getNameSpace(request), getActionName(request), getRequestMap(request), getParameterMap(request), getSessionMap(request), getApplicationMap());
} catch (IOException e) {
String message = "Could not wrap servlet request with MultipartRequestWrapper!";
log.error(message, e);
sendError(request, response, , new ServletException(message, e));
}
}
"/my/MyAction.action"则返回"/my"，具体实现如下：
protected String getNameSpace(HttpServletRequest request){
String servletPath = request.getServletPath();
return getNamespaceFromServletPath(servletPath);
}
public static String getNamespaceFromServletPath(String servletPath){
servletPath = servletPath.substring(, servletPath.lastIndexOf("/"));
return servletPath;
}
"MyAction.action"则返回"MyAction",具体实现如下：
protected String getActionName(HttpServletRequest request){
String servletPath = (String)request.getAttribute("javax.servlet.include.servlet_path");
if (servletPath == null) {
servletPath = request.getServletPath();
}
return getActionName(servletPath);
}
protected String getActionName(String name){
int beginIdx = name.lastIndexOf("/");
int endIdx = name.lastIndexOf(".");
return name.substring(beginIdx == - "htmlcode">
protected Map getRequestMap(HttpServletRequest request){
return new RequestMap(request);
}
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protected Map getParameterMap(HttpServletRequest request) throws IOException{
return request.getParameterMap();
}
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protected Map getSessionMap(HttpServletRequest request){
return new SessionMap(request);
}
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protected Map getApplicationMap(){
return new ApplicationMap(getServletContext());
}
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public void serviceAction(HttpServletRequest request, HttpServletResponse response, String namespace, String actionName, Map requestMap, Map parameterMap, Map sessionMap, Map applicationMap) {
HashMap extraContext = createContextMap(requestMap, parameterMap, sessionMap, applicationMap, request, response, getServletConfig());
extraContext.put("com.opensymphony.xwork.dispatcher.ServletDispatcher", this);
OgnlValueStack stack = (OgnlValueStack) request.getAttribute("webwork.valueStack");
if (stack != null) {
extraContext.put("com.opensymphony.xwork.util.OgnlValueStack.ValueStack", new OgnlValueStack(stack));
}
try {
ActionProxy proxy = ActionProxyFactory.getFactory().createActionProxy(namespace, actionName, extraContext);
request.setAttribute("webwork.valueStack", proxy.getInvocation().getStack());
proxy.execute();
if (stack != null) {
request.setAttribute("webwork.valueStack", stack);
}
} catch (ConfigurationException e) {
log.error("Could not find action", e);
sendError(request, response, 404, e);
} catch (Exception e) {
log.error("Could not execute action", e);
sendError(request, response, 500, e);
}
}
"color: #0000ff">3.DefaultActionProxyFactory、DefaultActionProxy、DefaultActionInvocation
前戏终于做完了，Action 调用的三兄弟要登场进行最重要的操作了，就是下面这三句代码，与Webwork 学习之路（五）请求跳转前 xwork.xml 的读取代码有非常相似的写法和设计：
ActionProxy proxy = ActionProxyFactory.getFactory().createActionProxy(namespace, actionName, extraContext);
request.setAttribute("webwork.valueStack", proxy.getInvocation().getStack());
proxy.execute(); "htmlcode">
static ActionProxyFactory factory = new DefaultActionProxyFactory();
public static void setFactory(ActionProxyFactory factory){
factory = factory;
}
public static ActionProxyFactory getFactory(){
return factory;
}
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public ActionProxy createActionProxy(String namespace, String actionName, Map extraContext)throws Exception {
setupConfigIfActionIsCommand(namespace, actionName);
return new DefaultActionProxy(namespace, actionName, extraContext, true);
} "Creating an DefaultActionProxy for namespace " + namespace + " and action name " + actionName);
}
this.actionName = actionName;
this.namespace = namespace;
this.executeResult = executeResult;
this.extraContext = extraContext;
this.config = ConfigurationManager.getConfiguration().getRuntimeConfiguration().getActionConfig(namespace, actionName);
if (this.config == null)
{
String message;
String message;
if ((namespace != null) && (namespace.trim().length() > 0)) {
message = LocalizedTextUtil.findDefaultText("xwork.exception.missing-package-action", Locale.getDefault(), new String[] {
namespace, actionName });
} else {
message = LocalizedTextUtil.findDefaultText("xwork.exception.missing-action", Locale.getDefault(), new String[] {
actionName });
}
throw new ConfigurationException(message);
}
prepare();
}
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protected void prepare() throws Exception {
this.invocation = ActionProxyFactory.getFactory().createActionInvocation(this, this.extraContext);
}
以上所示是针对Webwork中Action 调用 的相关知识，希望对大家有所帮助。
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