Ognl訪問對象屬性

package com.xs;import ognl.OgnlException;public class OgnlAccess {/** * @param args * @throws OgnlException  */public static void main(String[] args) throws OgnlException {Field field = new Field();System.out.println(ognl.Ognl.getValue("publicField", field));System.out.println(ognl.Ognl.getValue("privateField", field));}}class Field{public int publicField = 10;private int privateField = 11;}

輸出：

10
Exception in thread "main" ognl.NoSuchPropertyException: com.xs.Field.privateField
    at ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:151)
    at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2210)
    at ognl.ASTProperty.getValueBody(ASTProperty.java:114)
    at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
    at ognl.SimpleNode.getValue(SimpleNode.java:258)
    at ognl.Ognl.getValue(Ognl.java:494)
    at ognl.Ognl.getValue(Ognl.java:644)
    at ognl.Ognl.getValue(Ognl.java:702)
    at ognl.Ognl.getValue(Ognl.java:672)
    at com.xs.OgnlAccess.main(OgnlAccess.java:14)

可以看到 publicField欄位正常輸出，privateField報錯。可見有存取權限的欄位，無需getter方法，Ognl找不到getter方法會去直接存取欄位；對於沒有存取權限的欄位則不能直接存取。

給privateField添加getter方法：

class Field{public int publicField = 10;private int privateField = 11;public int getPrivateField() {return privateField;}}

輸出：

10
11

訪問都正常了。