根据name调用getName方法
问题是这样的，我看到原来有一个方法是根据name的名称调用getName（）这个方法。然后方法的实现是使用字符串的判断来实现的
代码如下：
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public Object getOrderby() {
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if (ORDER_TITLE.equals(this.ordered)) {
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return getTitle();
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} else if (ORDER_RENDERDATE.equals(this.ordered)) {
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return getRenderDate();
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} else if (ORDER_CREATEDATE.equals(this.ordered)) {
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return getCreateDate();
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} else if (ORDER_LASTMODIFIED.equals(this.ordered)) {
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return getLastModified();
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} else {
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return getTitle();
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}
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}
这样的话如果以后新增get方法就意味着要增加这个getOrderby()方法的判断。
所以我决定用类反射来改造这个方法，首先定义一个doGetMethod的方法
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private Object doGetMethod(String methodName) throws Exception {
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Object result = null;
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Object[] eo = new Object[] {};
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String getMethodName = "get" methodName.toLowerCase();
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Method[] methods = getClass().getMethods();
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for (int i = 0; i < methods.length; i) {
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Method method = methods;
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if (getMethodName.equals(method.getName().toLowerCase())) {
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result = method.invoke(this, eo);
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}
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}
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return result;
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} 这里根据methodName组合成getMethodName，然后到Method[]中找这个Method，然后用invoke调用这个方法
这里要说明invoke这个方法的参数是第一个参数是指定包含方法的类，第二个参数是指定方法需要的参数。
最后修改原来的getOrderBy
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public Object getOrderby() {
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Object obj = getTitle();
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try {
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obj = doGetMethod(getOrdered());
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} catch (Exception e) {
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return obj;
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}
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return obj;
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}
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