Java JspContext.getAttribute方法代码示例

import javax.servlet.jsp.JspContext; //导入方法依赖的package包/类
/**
 * Gets the {@link BeanFactory} from the given {@link JspContext}. The default
 * implementation automagically finds a {@link BeanFactory} that was previously set by
 * a {@link FrameworkServlet}. The result is cached.
 *
 * @param jspContext
 *            {@link JspContext} to be used
 * @return {@link BeanFactory} found
 */
@SuppressWarnings("unchecked")
protected BeanFactory getBeanFactory(JspContext jspContext) {
    Object bfCache = jspContext.getAttribute(TAGPROXY_BEANFACTORY_CACHE, PageContext.APPLICATION_SCOPE);
    if (bfCache != null && bfCache instanceof BeanFactory) {
        return (BeanFactory) bfCache;
    }

    Enumeration<String> en = jspContext.getAttributeNamesInScope(PageContext.APPLICATION_SCOPE);
    while (en.hasMoreElements()) {
        String attribute = en.nextElement();
        if (attribute.startsWith(FrameworkServlet.SERVLET_CONTEXT_PREFIX)) {
            Object bf = jspContext.getAttribute(attribute, PageContext.APPLICATION_SCOPE);
            if (bf != null && bf instanceof BeanFactory) {
                BeanFactory bfBean = (BeanFactory) bf;
                jspContext.setAttribute(TAGPROXY_BEANFACTORY_CACHE, bfBean, PageContext.APPLICATION_SCOPE);
                return bfBean;
            }
        }
    }

    throw new IllegalStateException("Could not find a BeanFactory. Use a FrameworkServlet or @BeanFactoryReference.");
}
 

import javax.servlet.jsp.JspContext; //导入方法依赖的package包/类
@Override
public Object getValue(ELContext context, Object base, Object property) {
    JspContext pageContext = (JspContext) context.getContext(JspContext.class);
    Boolean escapeXml = (Boolean) pageContext.getAttribute(ESCAPE_XML_ATTRIBUTE);
    if (escapeXml != null && !escapeXml) {
        return null;
    }

    try {
        if (excludeMe.get()) {
            return null;
        }

        // This resolver is in the original resolver chain. To prevent
        // infinite recursion, set a flag to prevent this resolver from
        // invoking the original resolver chain again when its turn in the
        // chain comes around.
        excludeMe.set(Boolean.TRUE);
        Object value = context.getELResolver().getValue(
                context, base, property);

        if (value instanceof String) {
            value = EscapeXml.escape((String) value);
        }
        return value;

    } finally {
        excludeMe.set(Boolean.FALSE);
    }
}
 

import javax.servlet.jsp.JspContext; //导入方法依赖的package包/类
public static String getUid(JspContext context) {
	String uuid = null;
	do {
		long rand = Double.doubleToLongBits(Math.random());
		uuid = Long.toHexString(rand).substring(0, 4);
	} while (context.getAttribute(uuid) != null);
	context.setAttribute(uuid, uuid);
	return uuid;
}
 

import javax.servlet.jsp.JspContext; //导入方法依赖的package包/类
public static Map<String, Object> getUserInfo(JspContext jspContext) {
	@SuppressWarnings("unchecked")
	Map<String, Object> userInfo = (Map<String, Object>) jspContext
			.getAttribute(WizardWedConstant.SESSION_USER_INFO,
					PageContext.SESSION_SCOPE);
	return userInfo;
}