|
前面的2篇文章已经详细的分析了ognl获取数据的过程和设置数据的过程。其中最重要的点是ognl的三要素： （1）表达式（Expression）表达式是整个OGNL的核心，所有的OGNL操作都是针对表达式的解析后进行的。简介的概括“干什么” （2）根对象（Root Object） 根对象可以理解为OGNL的操作对象。简介的概括“对谁干”或者“对谁操作” （3）上下文环境（Context） OGNL的内部，所有的操作都会在一个特定的环境中运行，简介的概括“在哪干”或者“在哪操作” 如果明白了ognl的三要素，下面就好理解了。 《刨根问底-struts-serviceAction（）创建并执行action》中分析了执行action方法之前，循环执行拦截器，其中ParametersInterceptor拦截器主要工作：把jsp中传来的数值赋值到action类中的属性。现在就看看ParametersInterceptor类doIntercept（）方法 1、ParametersInterceptor类doIntercept（）代码： @Override
public String doIntercept(ActionInvocation invocation) throws Exception {
Object action = invocation.getAction();
if (!(action instanceof NoParameters)) {
ActionContext ac = invocation.getInvocationContext();
final Map<String, Object> parameters = retrieveParameters(ac);
if (LOG.isDebugEnabled()) {
LOG.debug("Setting params " + getParameterLogMap(parameters));
}
if (parameters != null) {
Map<String, Object> contextMap = ac.getContextMap();
try {
ReflectionContextState.setCreatingNullObjects(contextMap, true);
ReflectionContextState.setDenyMethodExecution(contextMap, true);
ReflectionContextState.setReportingConversionErrors(contextMap, true);
ValueStack stack = ac.getValueStack();
setParameters(action, stack, parameters);
} finally {
ReflectionContextState.setCreatingNullObjects(contextMap, false);
ReflectionContextState.setDenyMethodExecution(contextMap, false);
ReflectionContextState.setReportingConversionErrors(contextMap, false);
}
}
}
return invocation.invoke();
}
注释：（1）Object action = invocation.getAction()，获取action对象，在这里就是Login，其中属性userName和passwod都为空。 （2）判断action是否属于NoParameters接口，如果是什么不处理 （3）ActionContext ac = invocation.getInvocationContext()，获取上下文对象ActionContext ，作为struts2执行Action时的上下文，存储了action在执行时需要用到的对象。如我们需要关注的ServletContext，Session， HttpServletRequest ，parameters等。 ActionContext类中有Map context全局变量，把所有的数据都保存到其中。 现在贴出context中的值： {com.opensymphony.xwork2.dispatcher.HttpServletRequest=org.apache.struts2.dispatcher.StrutsRequestWrapper@e9c592,
application={org.apache.catalina.resources=org.apache.naming.resources.ProxyDirContext@187b5ff,
org.apache.AnnotationProcessor=org.apache.catalina.util.DefaultAnnotationProcessor@bdb6ae,
org.apache.catalina.jsp_classpath=/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/classes/;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/activemq-all-5.6.0.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-beanutils-1.7.0.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-dbutils-1.3.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-io-1.4.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-lang-2.1.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-logging-1.0.4.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/freemarker-2.3.9.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/log4j_128.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/mysql-connector-java-5.1.9-bin.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/ognl-2.6.11.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/struts2-core-2.0.14.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/xwork-2.0.7.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/;
/E:/javahome/apache-tomcat-6.0.29/lib/annotations-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/catalina-ant.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/catalina-ha.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/catalina-tribes.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/catalina.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/el-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/jasper-el.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/jasper-jdt.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/jasper.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/jsp-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/servlet-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-coyote.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-dbcp.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-i18n-es.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-i18n-fr.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-i18n-ja.jar;
/E:/javahome/apache-tomcat-6.0.29/bin/bootstrap.jar;
/E:/javahome/jdk/lib/tools.jar;
/E:/javahome/jdk/jre/lib/ext/dnsns.jar;
/E:/javahome/jdk/jre/lib/ext/localedata.jar;
/E:/javahome/jdk/jre/lib/ext/sunjce_provider.jar;
/E:/javahome/jdk/jre/lib/ext/sunmscapi.jar;
/E:/javahome/jdk/jre/lib/ext/sunpkcs11.jar,
org.apache.jasper.runtime.JspApplicationContextImpl=org.apache.jasper.runtime.JspApplicationContextImpl@f97d27,
org.apache.catalina.WELCOME_FILES=[Ljava.lang.String;@17b6074,
javax.servlet.context.tempdir=E:\javahome\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\strutsDemo},
com.opensymphony.xwork2.ActionContext.locale=zh_CN,
com.opensymphony.xwork2.dispatcher.HttpServletResponse=org.apache.catalina.connector.ResponseFacade@12478a9,
com.opensymphony.xwork2.ActionContext.name=doLogin,
current.property.path=null,
com.opensymphony.xwork2.ActionContext.application={
org.apache.catalina.resources=org.apache.naming.resources.ProxyDirContext@187b5ff,
org.apache.AnnotationProcessor=org.apache.catalina.util.DefaultAnnotationProcessor@bdb6ae,
org.apache.catalina.jsp_classpath=/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/classes/;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/activemq-all-5.6.0.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-beanutils-1.7.0.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-dbutils-1.3.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-io-1.4.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-lang-2.1.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/commons-logging-1.0.4.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/freemarker-2.3.9.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/log4j_128.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/mysql-connector-java-5.1.9-bin.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/ognl-2.6.11.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/struts2-core-2.0.14.jar;
/E:/javahome/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/strutsDemo/WEB-INF/lib/xwork-2.0.7.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/;/E:/javahome/apache-tomcat-6.0.29/lib/annotations-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/catalina-ant.jar;/E:/javahome/apache-tomcat-6.0.29/lib/catalina-ha.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/catalina-tribes.jar;/E:/javahome/apache-tomcat-6.0.29/lib/catalina.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/el-api.jar;/E:/javahome/apache-tomcat-6.0.29/lib/jasper-el.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/jasper-jdt.jar;/E:/javahome/apache-tomcat-6.0.29/lib/jasper.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/jsp-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/servlet-api.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-coyote.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-dbcp.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-i18n-es.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-i18n-fr.jar;
/E:/javahome/apache-tomcat-6.0.29/lib/tomcat-i18n-ja.jar;
/E:/javahome/apache-tomcat-6.0.29/bin/bootstrap.jar;
/E:/javahome/jdk/lib/tools.jar;
/E:/javahome/jdk/jre/lib/ext/dnsns.jar;
/E:/javahome/jdk/jre/lib/ext/localedata.jar;
/E:/javahome/jdk/jre/lib/ext/sunjce_provider.jar;
/E:/javahome/jdk/jre/lib/ext/sunmscapi.jar;
/E:/javahome/jdk/jre/lib/ext/sunpkcs11.jar,
org.apache.jasper.runtime.JspApplicationContextImpl=org.apache.jasper.runtime.JspApplicationContextImpl@f97d27,
org.apache.catalina.WELCOME_FILES=[Ljava.lang.String;@17b6074, javax.servlet.context.tempdir=E:\javahome\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\strutsDemo},
last.property.accessed=null,
attr=org.apache.struts2.util.AttributeMap@16dc5c9,
com.opensymphony.xwork2.dispatcher.ServletContext=org.apache.catalina.core.ApplicationContextFacade@1d433c1,
com.opensymphony.xwork2.ActionContext.session={},
com.opensymphony.xwork2.ActionContext.actionInvocation=com.opensymphony.xwork2.DefaultActionInvocation@92015d,
session={},
com.opensymphony.xwork2.util.ValueStack.ValueStack=com.opensymphony.xwork2.util.OgnlValueStack@197871d,
last.bean.accessed=null,
request={struts.valueStack=com.opensymphony.xwork2.util.OgnlValueStack@197871d},
struts.actionMapping=org.apache.struts2.dispatcher.mapper.ActionMapping@898587,
parameters={userName=[Ljava.lang.String;@9d9edd, password=[Ljava.lang.String;@28df48},
com.opensymphony.xwork2.ActionContext.parameters={userName=[Ljava.lang.String;@9d9edd,
password=[Ljava.lang.String;@28df48}} 上面的代码比较多，可以中重点看几个：
com.opensymphony.xwork2.dispatcher.HttpServletRequest=org.apache.struts2.dispatcher.StrutsRequestWrapper@e9c592 com.opensymphony.xwork2.dispatcher.HttpServletResponse=org.apache.catalina.connector.ResponseFacade@12478a9 com.opensymphony.xwork2.ActionContext.name=doLogin com.opensymphony.xwork2.dispatcher.ServletContext=org.apache.catalina.core.ApplicationContextFacade@1d433c1, com.opensymphony.xwork2.util.ValueStack.ValueStack=com.opensymphony.xwork2.util.OgnlValueStack@197871d, parameters={userName=[Ljava.lang.String;@9d9edd, password=[Ljava.lang.String;@28df48}, 这都是常用到的几个对象，尤其是parameters，其中保存了userName和password值 （4）Map parameters = ac.getParameters()，在ac对象的context中获取parameters 。 （5）Map contextMap = ac.getContextMap()，获取ac对象的context，在这是ognl.OgnlContext，如果这里为什么可以是OgnlContext有疑问，请看前面的几篇文章。简单的说一句OgnlContext 实现map接口。 （6） ValueStack stack = ac.getValueStack()，获得ValueStack ，这里是com.opensymphony.xwork2.util.OgnlValueStack （7）setParameters设置参数 2、setParameters（）代码： protected void setParameters(Object action, ValueStack stack, final Map<String, Object> parameters) {
ParameterNameAware parameterNameAware = (action instanceof ParameterNameAware)
? (ParameterNameAware) action : null;
Map<String, Object> params;
Map<String, Object> acceptableParameters;
if (ordered) {
params = new TreeMap<String, Object>(getOrderedComparator());
acceptableParameters = new TreeMap<String, Object>(getOrderedComparator());
params.putAll(parameters);
} else {
params = new TreeMap<String, Object>(parameters);
acceptableParameters = new TreeMap<String, Object>();
}
for (Map.Entry<String, Object> entry : params.entrySet()) {
String name = entry.getKey();
boolean acceptableName = acceptableName(name)
&& (parameterNameAware == null
|| parameterNameAware.acceptableParameterName(name));
if (acceptableName) {
acceptableParameters.put(name, entry.getValue());
}
}
ValueStack newStack = valueStackFactory.createValueStack(stack);
boolean clearableStack = newStack instanceof ClearableValueStack;
if (clearableStack) {
//if the stack's context can be cleared, do that to prevent OGNL
//from having access to objects in the stack, see XW-641
((ClearableValueStack)newStack).clearContextValues();
Map<String, Object> context = newStack.getContext();
ReflectionContextState.setCreatingNullObjects(context, true);
ReflectionContextState.setDenyMethodExecution(context, true);
ReflectionContextState.setReportingConversionErrors(context, true);
}
boolean memberAccessStack = newStack instanceof MemberAccessValueStack;
if (memberAccessStack) {
//block or allow access to properties
//see WW-2761 for more details
MemberAccessValueStack accessValueStack = (MemberAccessValueStack) newStack;
accessValueStack.setAcceptProperties(acceptParams);
accessValueStack.setExcludeProperties(excludeParams);
}
for (Map.Entry<String, Object> entry : acceptableParameters.entrySet()) {
String name = entry.getKey();
Object value = entry.getValue();
try {
newStack.setValue(name, value);
} catch (RuntimeException e) {
if (devMode) {
String developerNotification = LocalizedTextUtil.findText(ParametersInterceptor.class, "devmode.notification", ActionContext.getContext().getLocale(), "Developer Notification:\n{0}", new Object[]{
"Unexpected Exception caught setting '" + name + "' on '" + action.getClass() + ": " + e.getMessage()
});
LOG.error(developerNotification);
if (action instanceof ValidationAware) {
((ValidationAware) action).addActionMessage(developerNotification);
}
}
}
}
if (clearableStack && (stack.getContext() != null) && (newStack.getContext() != null))
stack.getContext().put(ActionContext.CONVERSION_ERRORS, newStack.getContext().get(ActionContext.CONVERSION_ERRORS));
addParametersToContext(ActionContext.getContext(), acceptableParameters);
}
注释：（1）判断action是否实现ParameterNameAware接口，如果没有创建TreeMap，并且赋值给params （2）ValueStack newStack = ValueStackFactory.getFactory().createValueStack(stack)，获得一个valueStack。 ValueStackFactory.getFactory()获得是OgnlValueStackFactory。 （3）前面代码略过，请看重要的一行 newStack.setValue(name, value)，为什么在OgnlValueStack设置呢？很奇怪！继续看 3、OgnlValueStack类setValue（）代码： public void setValue(String expr, Object value)
{
setValue(expr, value, devMode);
} 注释：很简单，继续看。
4、setValue（）代码： public void setValue(String expr, Object value, boolean throwExceptionOnFailure) {
Map<String, Object> context = getContext();
try {
context.put(XWorkConverter.CONVERSION_PROPERTY_FULLNAME, expr);
context.put(REPORT_ERRORS_ON_NO_PROP, (throwExceptionOnFailure) ? Boolean.TRUE : Boolean.FALSE);
ognlUtil.setValue(expr, context, root, value);
} catch (OgnlException e) {
if (throwExceptionOnFailure) {
e.printStackTrace(System.out);
System.out.println("expr: " + expr + " val: " + value + " context: " + context + " root:" + root + " value: " + value);
String msg = "Error setting expression '" + expr + "' with value '" + value + "'";
throw new XWorkException(msg, e);
} else {
if (LOG.isWarnEnabled()) {
LOG.warn("Error setting value", e);
}
}
} catch (RuntimeException re) { //XW-281
if (throwExceptionOnFailure) {
StringBuilder msg = new StringBuilder();
msg.append("Error setting expression '");
msg.append(expr);
msg.append("' with value ");
if (value instanceof Object[]) {
Object[] valueArray = (Object[]) value;
msg.append("[");
for (int index = 0; index < valueArray.length; index++) {
msg.append("'");
msg.append(valueArray[index]);
msg.append("'");
if (index < (valueArray.length + 1))
msg.append(", ");
}
msg.append("]");
} else {
msg.append("'");
msg.append(value);
msg.append("'");
}
throw new XWorkException(msg.toString(), re);
} else {
if (LOG.isWarnEnabled()) {
LOG.warn("Error setting value", re);
}
}
} finally {
ReflectionContextState.clear(context);
context.remove(XWorkConverter.CONVERSION_PROPERTY_FULLNAME);
context.remove(REPORT_ERRORS_ON_NO_PROP);
}
}
注释：到这里OgnlUtil.setValue(expr, context, this.root, value)，在继续就是ognl框架执行的代码了，这里已经准备了ognl的三要素：expr表达式，context上下文，this.root 操作对象。但是这里为什么是root，为什么不是直接传递action对象呢？请继续看： OgnlValueStack类中重要部分代码
public class OgnlValueStack implements Serializable, ValueStack, ClearableValueStack, MemberAccessValueStack {
CompoundRoot root;
transient Map<String, Object> context;
Map<Object, Object> overrides;
private static CompoundRootAccessor accessor;
/* */ public OgnlValueStack(ValueStack vs) {
/* 104 */ setRoot(new CompoundRoot(vs.getRoot()));
/* */ }
public Map getContext()
/* */ {
/* 126 */ return this.context;
/* */ }
public CompoundRoot getRoot()
/* */ {
/* 159 */ return this.root;
/* */ }
注释：（1）OgnlValueStack中变量context就是上面解释的OgnlContext对象。 （2）ValueStack中的root对象是CompoundRoot，CompoundRoot继承了ArraryList，提供了额外的方法：push()和pop()方法，用来对root对象中所包含的数据进行存取！
public class CompoundRoot extends ArrayList {
public CompoundRoot() {
}
public CompoundRoot(List list) {
super(list);
}
public CompoundRoot cutStack(int index) {
return new CompoundRoot(subList(index, size()));
}
public Object peek() {
return get(0);
}
public Object pop() {
return remove(0);
}
public void push(Object o) {
add(0, o);
}
}
正是通过这两个方法，CompoundRoot变成了一个栈结构！压栈操作，将导致对象被放到CompoundRoot的第0个元素上（第0个元素是栈顶），其它对象被依次往后移动；出栈操作，将导致CompoundRoot的第0个元素被移除（即栈顶元素被弹出），其它对象被依次往前移动！ OGNL不支持多个root对象，而struts2能够支持多个root对象，它对OGNL做了扩展。 如果某个OGNL表达式被传递给ValueStack（即调用ValueStack的setValue或findValue方法），而表达式中包含有对root对象的访问操作，ValueStack将依次从栈顶往栈底搜索CompoundRoot对象中所包含的对象，看哪个对象具有相应的属性，找到之后，立刻返回。 在Struts2中，一个请求在最终到达Action的方法之前，Action对象本身会被压入ValueStack（实际上就是放到ValueStack的CompoundRoot中），所以Action对象是CompoundRoot中的一个元素。 （3）CompoundRoot保存了action对象，那什么时候取出来执行呢？CompoundRootAccessor就派上用场了。当问某个属性时，CompoundRootAccessor对象实例会负责在CompoundRoot对象中找到包含我们指定属性的对象。简单的看一下CompoundRootAccessor类中的setProperty（）方法：
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
CompoundRoot root = (CompoundRoot) target;
OgnlContext ognlContext = (OgnlContext) context;
for (Object o : root) {
if (o == null) {
continue;
}
try {
if (OgnlRuntime.hasSetProperty(ognlContext, o, name)) {
OgnlRuntime.setProperty(ognlContext, o, name, value);
return;
} else if (o instanceof Map) {
Map<Object, Object> map = (Map) o;
map.put(name, value);
return;
}
// } catch (OgnlException e) {
// if (e.getReason() != null) {
// final String msg = "Caught an Ognl exception while setting property " + name;
// log.error(msg, e);
// throw new RuntimeException(msg, e.getReason());
// }
} catch (IntrospectionException e) {
// this is OK if this happens, we'll just keep trying the next
}
}
Boolean reportError = (Boolean) context.get(ValueStack.REPORT_ERRORS_ON_NO_PROP);
final String msg = "No object in the CompoundRoot has a publicly accessible property named '" + name + "' (no setter could be found).";
if ((reportError != null) && (reportError.booleanValue())) {
throw new XWorkException(msg);
} else {
if (devMode) {
LOG.warn(msg);
}
}
}
首先会把target转换成CompoundRoot对象。
把context转换成OgnlContext对象。 遍历 类型为CompoundRoot的root 对象，上面解释道CompoundRoot保存里action对象，所以获得action对象，进行属性值设置，OgnlRuntime.setProperty(ognlContext, o, name, value)。 到这里整体分析完成了。
引用来自“zzuqiang”的评论在网上没找到中文介绍ognl表达式与struts2的详细文章。看到lz的文章眼前一亮，非常好。ognl的源码实现看起来头都大了。可能写的有点早了吧，没有使用泛型很多都是直接Object传参。楼主能分享一些学习ognl的书籍、博客地址、论坛地址等等。希望得到你的回答。谢谢！ 引用来自“bugeasy”的评论引用来自“zzuqiang”的评论在网上没找到中文介绍ognl表达式与struts2的详细文章。看到lz的文章眼前一亮，非常好。ognl的源码实现看起来头都大了。可能写的有点早了吧，没有使用泛型很多都是直接Object传参。楼主能分享一些学习ognl的书籍、博客地址、论坛地址等等。希望得到你的回答。谢谢！ 引用来自“zzuqiang”的评论引用来自“bugeasy”的评论引用来自“zzuqiang”的评论在网上没找到中文介绍ognl表达式与struts2的详细文章。看到lz的文章眼前一亮，非常好。ognl的源码实现看起来头都大了。可能写的有点早了吧，没有使用泛型很多都是直接Object传参。楼主能分享一些学习ognl的书籍、博客地址、论坛地址等等。希望得到你的回答。谢谢！ |
