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  • Spring的replace-method标签

    Spring的解析源码

        public void parseReplacedMethodSubElements(Element beanEle, MethodOverrides overrides) {
            NodeList nl = beanEle.getChildNodes();
            for (int i = 0; i < nl.getLength(); i++) {
                Node node = nl.item(i);
                //仅当在Spring默认bean的子元素下且为
           if (isCandidateElement(node) && nodeNameEquals(node, REPLACED_METHOD_ELEMENT)) { Element replacedMethodEle = (Element) node; //提取要替换的旧的方法
              String name
    = replacedMethodEle.getAttribute(NAME_ATTRIBUTE); //提取对应的新的替换方法
              String callback
    = replacedMethodEle.getAttribute(REPLACER_ATTRIBUTE); ReplaceOverride replaceOverride = new ReplaceOverride(name, callback); // Look for arg-type match elements. List<Element> argTypeEles = DomUtils.getChildElementsByTagName(replacedMethodEle, ARG_TYPE_ELEMENT); //记录参数
             
    for (Element argTypeEle : argTypeEles) {
                String match
    = argTypeEle.getAttribute(ARG_TYPE_MATCH_ATTRIBUTE); match = (StringUtils.hasText(match) ? match : DomUtils.getTextValue(argTypeEle)); if (StringUtils.hasText(match)) { replaceOverride.addTypeIdentifier(match); } } replaceOverride.setSource(extractSource(replacedMethodEle)); overrides.addOverride(replaceOverride); } } }

    replaced-method的使用

    public class LookupMethodBean {
        public void test(){
            System.out.println("原始方法!");
        }
    }
    
    public class MethodReplace implements MethodReplacer {
        public Object reimplement(Object obj, Method method, Object[] args) throws Throwable {
            System.out.println("方法已经被替换!");
            return null;
        }
    }
    
    <bean name="replacer" class="MethodReplace"> </bean> 
    <bean name="testBean" class="LookupMethodBean">
      <replaced-method name="test" replacer="replacer"> </replaced-method > 
    </bean> 
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  • 原文地址:https://www.cnblogs.com/wade-luffy/p/6068415.html
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