struts 核心解析

 一、概述

     Struts2的核心是一个Filter，Action可以脱离web容器，那么是什么让http请求和action关联在一起的，下面我们深入源码来分析下Struts2是如何工作的。

FilterDispatcher API 写道

Deprecated. Since Struts 2.1.3, use StrutsPrepareAndExecuteFilter instead or StrutsPrepareFilter and StrutsExecuteFilter if needing using the ActionContextCleanUp filter in addition to this one

 

     鉴于常规情况官方推荐使用StrutsPrepareAndExecuteFilter替代FilterDispatcher，我们此文 将剖析StrutsPrepareAndExecuteFilter，其在工程中作为一个Filter配置在web.xml中，配置如下：

<
filter
>
    <
filter-name
>
struts2
</
filter-name
>
    <
filter-class
>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</
filter-class
>
</
filter
>
<
filter-mapping
>
    <
filter-name
>
struts2
</
filter-name
>
    <
url-pattern
>
/*
</
url-pattern
>
</
filter-mapping
>

<filter>
	<filter-name>struts2</filter-name>
	<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
	<filter-name>struts2</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>

 

二、源码属性方法简介

    下面我们研究下StrutsPrepareAndExecuteFilter源码，类的主要信息如下：

 

属性摘要

protected  List <Pattern >	excludedPatterns
protected  ExecuteOperations	execute
protected  PrepareOperations	prepare

 

    StrutsPrepareAndExecuteFilter与普通的Filter并无区别，方法除继承自Filter外，仅有一个回调方法，第三部分我 们将按照Filter方法调用顺序，由init—>doFilter—>destroy顺序地分析源码。

方法摘要

void	destroy ()            继承自Filter，用于资源释放
void	doFilter (ServletRequest  req, ServletResponse  res, FilterChain  chain)              继承自Filter，执行方法
void	init (FilterConfig  filterConfig)              继承自Filter，初始化参数
protected  void	postInit (Dispatcher  dispatcher, FilterConfig  filterConfig)           Callback for post initialization（一个空的方法，用于方法回调初始化）

 

三、源码剖析    

 

    1、init方法

         init是Filter第一个运行的方法，我们看下struts2的核心Filter在调用init方法初始化时做哪些工作：

 
public
 
void
 init(FilterConfig filterConfig) 
throws
 ServletException {
        InitOperations init = new
 InitOperations();
        try
 {
//封装filterConfig，其中有个主要方法getInitParameterNames将参数名字以String格式存储在List中
            FilterHostConfig config = new
 FilterHostConfig(filterConfig);
// 初始化struts内部日志
           init.initLogging(config);
//<strong>创建dispatcher ，并初始化，这部分下面我们重点分析，初始化时加载那些资源</strong>
            Dispatcher dispatcher = init.initDispatcher(config);
            init.initStaticContentLoader(config, dispatcher);
//初始化类属性：prepare 、execute
            prepare = new
 PrepareOperations(filterConfig.getServletContext(), dispatcher);
            execute = new
 ExecuteOperations(filterConfig.getServletContext(), dispatcher);
            this
.excludedPatterns = init.buildExcludedPatternsList(dispatcher);
//回调空的postInit方法
            postInit(dispatcher, filterConfig);
        } finally
 {
            init.cleanup();
        }
 }

 public void init(FilterConfig filterConfig) throws ServletException {
        InitOperations init = new InitOperations();
        try {
//封装filterConfig，其中有个主要方法getInitParameterNames将参数名字以String格式存储在List中
            FilterHostConfig config = new FilterHostConfig(filterConfig);
// 初始化struts内部日志
           init.initLogging(config);
//创建dispatcher ，并初始化，这部分下面我们重点分析，初始化时加载那些资源

            Dispatcher dispatcher = init.initDispatcher(config);
            init.initStaticContentLoader(config, dispatcher);
//初始化类属性：prepare 、execute 
            prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
            execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
			this.excludedPatterns = init.buildExcludedPatternsList(dispatcher);
//回调空的postInit方法
            postInit(dispatcher, filterConfig);
        } finally {
            init.cleanup();
        }
 }

 

   首先看下FilterHostConfig ，源码如下：

 

public
 
class
 FilterHostConfig 
implements
 HostConfig {

    private
 FilterConfig config;
    /**
     *构造函数
     */
    public
 FilterHostConfig(FilterConfig config) {
        this
.config = config;
    }
    /**
     *  根据init-param配置的param-name获取param-value的值
     */
    public
 String getInitParameter(String key) {
        return
 config.getInitParameter(key);
    }
       /**
         *  返回初始化参数名的List
     */
    public
 Iterator<String> getInitParameterNames() {
        return
 MakeIterator.convert(config.getInitParameterNames());
    }

    public
 ServletContext getServletContext() {
        return
 config.getServletContext();
    }
}

public class FilterHostConfig implements HostConfig {

    private FilterConfig config;
    /**
     *构造函数  
     */    
    public FilterHostConfig(FilterConfig config) {
        this.config = config;
    }
    /**
     *  根据init-param配置的param-name获取param-value的值
     */  
    public String getInitParameter(String key) {
        return config.getInitParameter(key);
    }
       /**
         *  返回初始化参数名的List
     */ 
    public Iterator<String> getInitParameterNames() {
        return MakeIterator.convert(config.getInitParameterNames());
    }

    public ServletContext getServletContext() {
        return config.getServletContext();
    }
}

   只有短短的几行代码，getInitParameterNames是这个类的核心，将Filter初始化参数名称有枚举类型转为Iterator。此类的主要作为是对filterConfig 封装。

 

 

    重点来了，创建并初始化Dispatcher      

public
 Dispatcher initDispatcher( HostConfig filterConfig ) {
       Dispatcher dispatcher = createDispatcher(filterConfig);
       dispatcher.init();
       return
 dispatcher;
   }

 public Dispatcher initDispatcher( HostConfig filterConfig ) {
        Dispatcher dispatcher = createDispatcher(filterConfig);
        dispatcher.init();
        return dispatcher;
    }

     创建Dispatcher，会读取 filterConfig 中的配置信息，将配置信息解析出来，封装成为一个Map，然后根绝servlet上下文和参数Map构造Dispatcher ：

private
 Dispatcher createDispatcher( HostConfig filterConfig ) {
        Map<String, String> params = new
 HashMap<String, String>();
        for
 ( Iterator e = filterConfig.getInitParameterNames(); e.hasNext(); ) {
            String name = (String) e.next();
            String value = filterConfig.getInitParameter(name);
            params.put(name, value);
        }
        return
 
new
 Dispatcher(filterConfig.getServletContext(), params);
    }

private Dispatcher createDispatcher( HostConfig filterConfig ) {
        Map<String, String> params = new HashMap<String, String>();
        for ( Iterator e = filterConfig.getInitParameterNames(); e.hasNext(); ) {
            String name = (String) e.next();
            String value = filterConfig.getInitParameter(name);
            params.put(name, value);
        }
        return new Dispatcher(filterConfig.getServletContext(), params);
    }

  Dispatcher初始化，加载struts2的相关配置文件，将按照顺序逐一加载：default.properties，struts-default.xml,struts-plugin.xml,struts.xml，……

 

/**
*初始化过程中依次加载如下配置文件
*/
public
 
void
 init() {

        if
 (configurationManager == 
null
) {
            configurationManager = new
 ConfigurationManager(BeanSelectionProvider.DEFAULT_BEAN_NAME);
        }

        try
 {
            //加载org/apache/struts2/default.properties
            init_DefaultProperties(); // [1]
           //加载struts-default.xml,struts-plugin.xml,struts.xml
            init_TraditionalXmlConfigurations(); // [2]
            init_LegacyStrutsProperties(); // [3]
           //用户自己实现的ConfigurationProviders类
        init_CustomConfigurationProviders(); // [5]
            //Filter的初始化参数
        init_FilterInitParameters() ; // [6]
            init_AliasStandardObjects() ; // [7]

            Container container = init_PreloadConfiguration();
            container.inject(this
);
            init_CheckConfigurationReloading(container);
            init_CheckWebLogicWorkaround(container);

            if
 (!dispatcherListeners.isEmpty()) {
                for
 (DispatcherListener l : dispatcherListeners) {
                    l.dispatcherInitialized(this
);
                }
            }
        } catch
 (Exception ex) {
            if
 (LOG.isErrorEnabled())
                LOG.error("Dispatcher initialization failed"
, ex);
            throw
 
new
 StrutsException(ex);
        }
    }

/**
*初始化过程中依次加载如下配置文件
*/
public void init() {

    	if (configurationManager == null) {
    		configurationManager = new ConfigurationManager(BeanSelectionProvider.DEFAULT_BEAN_NAME);
    	}

        try {
            //加载org/apache/struts2/default.properties
            init_DefaultProperties(); // [1]
           //加载struts-default.xml,struts-plugin.xml,struts.xml
            init_TraditionalXmlConfigurations(); // [2]
            init_LegacyStrutsProperties(); // [3]
           //用户自己实现的ConfigurationProviders类            
        init_CustomConfigurationProviders(); // [5]
            //Filter的初始化参数
        init_FilterInitParameters() ; // [6]
            init_AliasStandardObjects() ; // [7]

            Container container = init_PreloadConfiguration();
            container.inject(this);
            init_CheckConfigurationReloading(container);
            init_CheckWebLogicWorkaround(container);

            if (!dispatcherListeners.isEmpty()) {
                for (DispatcherListener l : dispatcherListeners) {
                    l.dispatcherInitialized(this);
                }
            }
        } catch (Exception ex) {
            if (LOG.isErrorEnabled())
                LOG.error("Dispatcher initialization failed", ex);
            throw new StrutsException(ex);
        }
    }

 

   初始化default.properties，具体的初始化操作在DefaultPropertiesProvider类中

  

private
 
void
 init_DefaultProperties() {
       configurationManager.addConfigurationProvider(new
 DefaultPropertiesProvider());
   }

 private void init_DefaultProperties() {
        configurationManager.addConfigurationProvider(new DefaultPropertiesProvider());
    }

    

   下面我们看下DefaultPropertiesProvider类源码：

 

public
 
void
 register(ContainerBuilder builder, LocatableProperties props)
            throws
 ConfigurationException {

        Settings defaultSettings = null
;
        try
 {
            defaultSettings = new
 PropertiesSettings(
"org/apache/struts2/default"
);
        } catch
 (Exception e) {
            throw
 
new
 ConfigurationException(
"Could not find or error in org/apache/struts2/default.properties"
, e);
        }

        loadSettings(props, defaultSettings);
    }

public void register(ContainerBuilder builder, LocatableProperties props)
            throws ConfigurationException {
        
        Settings defaultSettings = null;
        try {
            defaultSettings = new PropertiesSettings("org/apache/struts2/default");
        } catch (Exception e) {
            throw new ConfigurationException("Could not find or error in org/apache/struts2/default.properties", e);
        }
        
        loadSettings(props, defaultSettings);
    }

 

   其他的我们再次省略，大家可以浏览下各个初始化操作都加载了那些文件

3、doFilter方法

     doFilter是过滤器的执行方法，它拦截提交的HttpServletRequest请求，HttpServletResponse响应，作为strtus2的核心拦截器，在doFilter里面到底做了哪些工作，我们将逐行解读其源码，源码如下：

 

 
public
 
void
 doFilter(ServletRequest req, ServletResponse res, FilterChain chain) 
throws
 IOException, ServletException {
     //父类向子类转：强转为http请求、响应
     HttpServletRequest request = (HttpServletRequest) req;
     HttpServletResponse response = (HttpServletResponse) res;

     try
 {
         //设置编码和国际化
         prepare.setEncodingAndLocale(request, response);
          //创建Action上下文（重点）
         prepare.createActionContext(request, response);
         prepare.assignDispatcherToThread();
if
 ( excludedPatterns != 
null
 && prepare.isUrlExcluded(request, excludedPatterns)) {
    chain.doFilter(request, response);
} else
 {
    request = prepare.wrapRequest(request);
    ActionMapping mapping = prepare.findActionMapping(request, response, true
);
    if
 (mapping == 
null
) {
        boolean
 handled = execute.executeStaticResourceRequest(request, response);
        if
 (!handled) {
            chain.doFilter(request, response);
        }
    } else
 {
        execute.executeAction(request, response, mapping);
    }
}
     } finally
 {
         prepare.cleanupRequest(request);
     }
 }

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        //父类向子类转：强转为http请求、响应
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;

        try {
            //设置编码和国际化
            prepare.setEncodingAndLocale(request, response);
             //创建Action上下文（重点）
            prepare.createActionContext(request, response);
            prepare.assignDispatcherToThread();
			if ( excludedPatterns != null && prepare.isUrlExcluded(request, excludedPatterns)) {
				chain.doFilter(request, response);
			} else {
				request = prepare.wrapRequest(request);
				ActionMapping mapping = prepare.findActionMapping(request, response, true);
				if (mapping == null) {
					boolean handled = execute.executeStaticResourceRequest(request, response);
					if (!handled) {
						chain.doFilter(request, response);
					}
				} else {
					execute.executeAction(request, response, mapping);
				}
			}
        } finally {
            prepare.cleanupRequest(request);
        }
    }

 

    setEncodingAndLocale调用了dispatcher方法的prepare方法：

 

/**
     * Sets the request encoding and locale on the response
     */
    public
 
void
 setEncodingAndLocale(HttpServletRequest request, HttpServletResponse response) {
        dispatcher.prepare(request, response);
    }

/**
     * Sets the request encoding and locale on the response
     */
    public void setEncodingAndLocale(HttpServletRequest request, HttpServletResponse response) {
        dispatcher.prepare(request, response);
    }

 

   下面我们看下prepare方法，这个方法很简单只是设置了encoding 、locale ，做的只是一些辅助的工作：

public
 
void
 prepare(HttpServletRequest request, HttpServletResponse response) {
        String encoding = null
;
        if
 (defaultEncoding != 
null
) {
            encoding = defaultEncoding;
        }

        Locale locale = null
;
        if
 (defaultLocale != 
null
) {
            locale = LocalizedTextUtil.localeFromString(defaultLocale, request.getLocale());
        }

        if
 (encoding != 
null
) {
            try
 {
                request.setCharacterEncoding(encoding);
            } catch
 (Exception e) {
                LOG.error("Error setting character encoding to '"
 + encoding + 
"' - ignoring."
, e);
            }
        }

        if
 (locale != 
null
) {
            response.setLocale(locale);
        }

        if
 (paramsWorkaroundEnabled) {
            request.getParameter("foo"
); 
// simply read any parameter (existing or not) to "prime" the request
        }
    }

public void prepare(HttpServletRequest request, HttpServletResponse response) {
        String encoding = null;
        if (defaultEncoding != null) {
            encoding = defaultEncoding;
        }

        Locale locale = null;
        if (defaultLocale != null) {
            locale = LocalizedTextUtil.localeFromString(defaultLocale, request.getLocale());
        }

        if (encoding != null) {
            try {
                request.setCharacterEncoding(encoding);
            } catch (Exception e) {
                LOG.error("Error setting character encoding to '" + encoding + "' - ignoring.", e);
            }
        }

        if (locale != null) {
            response.setLocale(locale);
        }

        if (paramsWorkaroundEnabled) {
            request.getParameter("foo"); // simply read any parameter (existing or not) to "prime" the request
        }
    }

 

   Action上下文创建（重点）

       ActionContext是一个容器，这个容易主要存储request、session、application、parameters等相关信 息.ActionContext是一个线程的本地变量，这意味着不同的action之间不会共享ActionContext，所以也不用考虑线程安全问 题。其实质是一个Map，key是标示request、session、……的字符串，值是其对应的对象：

static
 ThreadLocal actionContext = 
new
 ThreadLocal();
Map<String, Object> context;

static ThreadLocal actionContext = new ThreadLocal();
Map<String, Object> context;

 
   下面我们看下如何创建action上下文的，代码如下：

 

/**
*创建Action上下文，初始化thread local
*/
public
 ActionContext createActionContext(HttpServletRequest request, HttpServletResponse response) {
    ActionContext ctx;
    Integer counter = 1
;
    Integer oldCounter = (Integer) request.getAttribute(CLEANUP_RECURSION_COUNTER);
    if
 (oldCounter != 
null
) {
        counter = oldCounter + 1
;
    }
    //注意此处是从ThreadLocal中获取此ActionContext变量
    ActionContext oldContext = ActionContext.getContext();
    if
 (oldContext != 
null
) {
        // detected existing context, so we are probably in a forward
        ctx = new
 ActionContext(
new
 HashMap<String, Object>(oldContext.getContextMap()));
    } else
 {
        ValueStack stack = dispatcher.getContainer().getInstance(ValueStackFactory.class
).createValueStack();
        stack.getContext().putAll(dispatcher.createContextMap(request, response, null
, servletContext));
        //stack.getContext()返回的是一个Map<String，Object>，根据此Map构造一个ActionContext
        ctx = new
 ActionContext(stack.getContext());
    }
    request.setAttribute(CLEANUP_RECURSION_COUNTER, counter);
    //将ActionContext存如ThreadLocal
    ActionContext.setContext(ctx);
    return
 ctx;
}

/**
*创建Action上下文，初始化thread local
*/
public ActionContext createActionContext(HttpServletRequest request, HttpServletResponse response) {
    ActionContext ctx;
    Integer counter = 1;
    Integer oldCounter = (Integer) request.getAttribute(CLEANUP_RECURSION_COUNTER);
    if (oldCounter != null) {
        counter = oldCounter + 1;
    }
    //注意此处是从ThreadLocal中获取此ActionContext变量
    ActionContext oldContext = ActionContext.getContext();
    if (oldContext != null) {
        // detected existing context, so we are probably in a forward
        ctx = new ActionContext(new HashMap<String, Object>(oldContext.getContextMap()));
    } else {
        ValueStack stack = dispatcher.getContainer().getInstance(ValueStackFactory.class).createValueStack();
        stack.getContext().putAll(dispatcher.createContextMap(request, response, null, servletContext));
        //stack.getContext()返回的是一个Map<String，Object>，根据此Map构造一个ActionContext
        ctx = new ActionContext(stack.getContext());
    }
    request.setAttribute(CLEANUP_RECURSION_COUNTER, counter);
    //将ActionContext存如ThreadLocal
    ActionContext.setContext(ctx);
    return ctx;
}

 

    上面代码中dispatcher.createContextMap，如何封装相关参数：

 

public
 Map<String,Object> createContextMap(HttpServletRequest request, HttpServletResponse response,
            ActionMapping mapping, ServletContext context) {

        // request map wrapping the http request objects
        Map requestMap = new
 RequestMap(request);

        // parameters map wrapping the http parameters.  ActionMapping parameters are now handled and applied separately
        Map params = new
 HashMap(request.getParameterMap());

        // session map wrapping the http session
        Map session = new
 SessionMap(request);

        // application map wrapping the ServletContext
        Map application = new
 ApplicationMap(context);
                //requestMap、params、session等Map封装成为一个上下文Map，逐个调用了map.put(Map p).
        Map<String,Object> extraContext = createContextMap(requestMap, params, session, application, request, response, context);

        if
 (mapping != 
null
) {
            extraContext.put(ServletActionContext.ACTION_MAPPING, mapping);
        }
        return
 extraContext;
}

public Map<String,Object> createContextMap(HttpServletRequest request, HttpServletResponse response,
            ActionMapping mapping, ServletContext context) {

        // request map wrapping the http request objects
        Map requestMap = new RequestMap(request);

        // parameters map wrapping the http parameters.  ActionMapping parameters are now handled and applied separately
        Map params = new HashMap(request.getParameterMap());

        // session map wrapping the http session
        Map session = new SessionMap(request);

        // application map wrapping the ServletContext
        Map application = new ApplicationMap(context);
				//requestMap、params、session等Map封装成为一个上下文Map，逐个调用了map.put(Map p).
        Map<String,Object> extraContext = createContextMap(requestMap, params, session, application, request, response, context);

        if (mapping != null) {
            extraContext.put(ServletActionContext.ACTION_MAPPING, mapping);
        }
        return extraContext;
}

 

 我们简单看下RequestMap，其他的省略。RequestMap类实现了抽象Map，故其本身是一个Map，主要方法实现：

//map的get实现
public
 Object get(Object key) {
    return
 request.getAttribute(key.toString());
}
//map的put实现
public
 Object put(Object key, Object value) {
    Object oldValue = get(key);
    entries = null
;
    request.setAttribute(key.toString(), value);
    return
 oldValue;
}

//map的get实现
public Object get(Object key) {
    return request.getAttribute(key.toString());
}
//map的put实现
public Object put(Object key, Object value) {
    Object oldValue = get(key);
    entries = null;
    request.setAttribute(key.toString(), value);
    return oldValue;
}

 

   下面是源码展示了如何执行Action控制器：

 

public
 
void
 executeAction(HttpServletRequest request, HttpServletResponse response, ActionMapping mapping) 
throws
 ServletException {
    dispatcher.serviceAction(request, response, servletContext, mapping);
}

    public
 
void
 serviceAction(HttpServletRequest request, HttpServletResponse response, ServletContext context,
                              ActionMapping mapping) throws
 ServletException {
                //封装执行的上下文环境，主要讲相关信息存储入map
        Map<String, Object> extraContext = createContextMap(request, response, mapping, context);

        // If there was a previous value stack, then create a new copy and pass it in to be used by the new Action
        ValueStack stack = (ValueStack) request.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
        boolean
 nullStack = stack == 
null
;
        if
 (nullStack) {
            ActionContext ctx = ActionContext.getContext();
            if
 (ctx != 
null
) {
                stack = ctx.getValueStack();
            }
        }
        if
 (stack != 
null
) {
            extraContext.put(ActionContext.VALUE_STACK, valueStackFactory.createValueStack(stack));
        }

        String timerKey = "Handling request from Dispatcher"
;
        try
 {
            UtilTimerStack.push(timerKey);
            //获取命名空间
            String namespace = mapping.getNamespace();
            //获取action配置的name属性
            String name = mapping.getName();
            //获取action配置的method属性
            String method = mapping.getMethod();

            Configuration config = configurationManager.getConfiguration();
            //根据执行上下文参数，命名空间，名称等创建用户自定义Action的代理对象
            ActionProxy proxy = config.getContainer().getInstance(ActionProxyFactory.class
).createActionProxy(
                    namespace, name, method, extraContext, true
, 
false
);

            request.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, proxy.getInvocation().getStack());

            // if the ActionMapping says to go straight to a result, do it!
                    //执行execute方法，并转向结果
            if
 (mapping.getResult() != 
null
) {
                Result result = mapping.getResult();
                result.execute(proxy.getInvocation());
            } else
 {
                proxy.execute();
            }

            // If there was a previous value stack then set it back onto the request
            if
 (!nullStack) {
                request.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
            }
        } catch
 (ConfigurationException e) {
            // WW-2874 Only log error if in devMode
            if
(devMode) {
                String reqStr = request.getRequestURI();
                if
 (request.getQueryString() != 
null
) {
                    reqStr = reqStr + "?"
 + request.getQueryString();
                }
                LOG.error("Could not find action or result\n"
 + reqStr, e);
            }
            else
 {
                LOG.warn("Could not find action or result"
, e);
            }
            sendError(request, response, context, HttpServletResponse.SC_NOT_FOUND, e);
        } catch
 (Exception e) {
            sendError(request, response, context, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        } finally
 {
            UtilTimerStack.pop(timerKey);
        }
    }

public void executeAction(HttpServletRequest request, HttpServletResponse response, ActionMapping mapping) throws ServletException {
    dispatcher.serviceAction(request, response, servletContext, mapping);
}

    public void serviceAction(HttpServletRequest request, HttpServletResponse response, ServletContext context,
                              ActionMapping mapping) throws ServletException {
				//封装执行的上下文环境，主要讲相关信息存储入map
        Map<String, Object> extraContext = createContextMap(request, response, mapping, context);

        // If there was a previous value stack, then create a new copy and pass it in to be used by the new Action
        ValueStack stack = (ValueStack) request.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
        boolean nullStack = stack == null;
        if (nullStack) {
            ActionContext ctx = ActionContext.getContext();
            if (ctx != null) {
                stack = ctx.getValueStack();
            }
        }
        if (stack != null) {
            extraContext.put(ActionContext.VALUE_STACK, valueStackFactory.createValueStack(stack));
        }

        String timerKey = "Handling request from Dispatcher";
        try {
            UtilTimerStack.push(timerKey);
            //获取命名空间
            String namespace = mapping.getNamespace();
            //获取action配置的name属性
            String name = mapping.getName();
            //获取action配置的method属性
            String method = mapping.getMethod();

            Configuration config = configurationManager.getConfiguration();
            //根据执行上下文参数，命名空间，名称等创建用户自定义Action的代理对象
            ActionProxy proxy = config.getContainer().getInstance(ActionProxyFactory.class).createActionProxy(
                    namespace, name, method, extraContext, true, false);

            request.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, proxy.getInvocation().getStack());

            // if the ActionMapping says to go straight to a result, do it!
    				//执行execute方法，并转向结果
            if (mapping.getResult() != null) {
                Result result = mapping.getResult();
                result.execute(proxy.getInvocation());
            } else {
                proxy.execute();
            }

            // If there was a previous value stack then set it back onto the request
            if (!nullStack) {
                request.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
            }
        } catch (ConfigurationException e) {
        	// WW-2874 Only log error if in devMode
        	if(devMode) {
                String reqStr = request.getRequestURI();
                if (request.getQueryString() != null) {
                    reqStr = reqStr + "?" + request.getQueryString();
                }
                LOG.error("Could not find action or result\n" + reqStr, e);
            }
        	else {
        		LOG.warn("Could not find action or result", e);
        	}
            sendError(request, response, context, HttpServletResponse.SC_NOT_FOUND, e);
        } catch (Exception e) {
            sendError(request, response, context, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        } finally {
            UtilTimerStack.pop(timerKey);
        }
    }

 

   文中对如何解析Struts.xml，如何将URL与action映射匹配为分析，有需要的我后续补全，因为 StrutsXmlConfigurationProvider继承XmlConfigurationProvider，并在register方法回调父 类的register，有兴趣的可以深入阅读下下XmlConfigurationProvider源码：

 

public
 
void
 register(ContainerBuilder containerBuilder, LocatableProperties props) 
throws
 ConfigurationException {
       if
 (servletContext != 
null
 && !containerBuilder.contains(ServletContext.
class
)) {
           containerBuilder.factory(ServletContext.class
, 
new
 Factory<ServletContext>() {
               public
 ServletContext create(Context context) 
throws
 Exception {
                   return
 servletContext;
               }
           });
       }
       //调用父类的register，关键点所在
       super
.register(containerBuilder, props);
   }

 public void register(ContainerBuilder containerBuilder, LocatableProperties props) throws ConfigurationException {
        if (servletContext != null && !containerBuilder.contains(ServletContext.class)) {
            containerBuilder.factory(ServletContext.class, new Factory<ServletContext>() {
                public ServletContext create(Context context) throws Exception {
                    return servletContext;
                }
            });
        }
        //调用父类的register，关键点所在
        super.register(containerBuilder, props);
    }

 

 

     struts2-core-2.2.1.jar包中struts-2.1.7.dtd对于Action的定义如下：

<!ELEMENT action (param|result|interceptor-ref|exception-mapping)*
>
<!ATTLIST action
    name CDATA #REQUIRED
    class CDATA #IMPLIED
    method CDATA #IMPLIED
    converter CDATA #IMPLIED
>

<!ELEMENT action (param|result|interceptor-ref|exception-mapping)*>
<!ATTLIST action
    name CDATA #REQUIRED
    class CDATA #IMPLIED
    method CDATA #IMPLIED
    converter CDATA #IMPLIED
>

    从上述DTD中可见Action元素可以含有name 、class 、method 、converter 属性。

 

   XmlConfigurationProvider解析struts.xml配置的Action元素：

protected
 


  


  
    
    分享到：
      
      
    
  

  
    
      js 收集1
      |
      Java类库中的集合类解析
    
  
  
    
      2010-12-03 14:25
      浏览 2386
      评论(0)
      
      
      分类:企业架构      
      查看更多