Ognl的扩展点:
http://java12345678.iteye.com/blog/2031790
MemberAccess接口
定义了对于Memeber(Constructor,Method,Filed是否可以访问),Ognl默认实现DefaultMemberAccess对非公有Member不可以访问。
Struts2对DefaultMemberAccess进行了扩展:在DefaultMemberAccess的非公有Member不可以访问的基础上,添加哪些公有Member可以访问或不可被访问

一、参数决定哪些Memeber可以访问
1.静态方法是否可以访问:由boolean型构建参数决定
public SecurityMemberAccess(boolean method) {
allowStaticMethodAccess = method;
}
2.哪些公有Member不可以访问:由属性Set<Pattern> excludeProperties决定
3.哪些公有Member可以访问:Set<Pattern> acceptProperties
4.由PropertiesJudge propertiesJudge对象决定某个Memeber是否可以访问
程序代码中的判断:
protected boolean isAcceptableProperty(String name) {
if ( name == null) {
return true;
}
//属性名propertyName 不匹配excludeProperties
//属性名propertyName 匹配acceptProperties
//如果存在propertiesJudge ,则acceptProperty返回true
//全满足才能访问
if ((!isExcluded(name)) && isAccepted(name) && (propertiesJudge == null || propertiesJudge.acceptProperty(name))) {
return true;
}
return false;
}
二、参数的由来:OgnlValueStack
public class OgnlValueStack{
transient SecurityMemberAccess securityMemberAccess;
protected void setRoot(XWorkConverter xworkConverter, CompoundRootAccessor accessor, CompoundRoot compoundRoot,
boolean allowStaticMethodAccess) {
//省略了部分代码
this.securityMemberAccess = new SecurityMemberAccess(allowStaticMethodAccess);
this.context = Ognl.createDefaultContext(this.root, accessor, new OgnlTypeConverterWrapper(xworkConverter), securityMemberAccess);
}
public void setAcceptProperties(Set<Pattern> acceptedProperties) {
securityMemberAccess.setAcceptProperties(acceptedProperties);
}
public void setPropertiesJudge(PropertiesJudge judge) {
securityMemberAccess.setPropertiesJudge(judge);
}
public void setExcludeProperties(Set<Pattern> excludeProperties) {
securityMemberAccess.setExcludeProperties(excludeProperties);
}
}
OgnlValueStack 由OgnlValueStackFactory构建:
public class OgnlValueStackFactory implements ValueStackFactory{
@Inject(value="allowStaticMethodAccess", required=false)
public void setAllowStaticMethodAccess(String allowStaticMethodAccess) {
this.allowStaticMethodAccess = "true".equalsIgnoreCase(allowStaticMethodAccess);
}
}
本文详细介绍了Struts2框架中Ognl的安全访问机制,包括如何通过SecurityMemberAccess类来控制成员的访问权限,以及如何设置允许或禁止访问的属性等。
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