struts2对Ognl的封装--ClassResolver-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_21194/article/details/82573179

本文探讨了Ognl在Struts框架中的扩展应用，特别是针对OGNLClassResolver接口的功能介绍，该接口负责从类名查找并加载对应的Class文件，支持静态属性或方法的调用。同时深入分析了Struts对ClassResolver的具体实现。

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Ognl的扩展点：

http://java12345678.iteye.com/blog/2031790

OGNL ClassResolver接口 :

用于由类名到类路径中找到Class文件，并加载生成Class对象，以支持静态属性或方法的调用

Struts对ClassResolver 的扩展：

Struts中ClassResolver的加载：

OgnlValueStack类（Struts对Ognl的封装类）:

  protected void setRoot(XWorkConverter xworkConverter, CompoundRootAccessor accessor, CompoundRoot compoundRoot,
                           boolean allowStaticMethodAccess) {
        this.context = Ognl.createDefaultContext(this.root, accessor, new OgnlTypeConverterWrapper(xworkConverter), securityMemberAccess);
    }

CompoundRootAccessor类源码：

 public Class classForName(String className, Map context) throws ClassNotFoundException {
        Object root = Ognl.getRoot(context);

        try {
            if (root instanceof CompoundRoot) {
                if (className.startsWith("vs")) {//？？？？没明白呢
                    CompoundRoot compoundRoot = (CompoundRoot) root;

                    if ("vs".equals(className)) {
                        return compoundRoot.peek().getClass();
                    }

                    int index = Integer.parseInt(className.substring(2));

                    return compoundRoot.get(index - 1).getClass();
                }
            }
        } catch (Exception e) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Got exception when tried to get class for name [#0]", e, className);
            }
        }

        return Thread.currentThread().getContextClassLoader().loadClass(className);
    }