spring替代方法

public class MyValueCalculator { public String computeValue(String input) {
// some real code...
} // some other methods...}

/**
* meant to be used to override the existing computeValue(String)
* implementation in MyValueCalculator
*/
public class ReplacementComputeValue implements MethodReplacer { public Object reimplement(Object o, Method m, Object[] args) throws Throwable {
// get the input value, work with it, and return a computed result
String input = (String) args[];
...
return ...;
}
}

<bean id="myValueCalculator" class="x.y.z.MyValueCalculator">
<!-- arbitrary method replacement -->
<replaced-method name="computeValue" replacer="replacementComputeValue">
<arg-type>String</arg-type>
</replaced-method>
</bean><bean id="replacementComputeValue" class="a.b.c.ReplacementComputeValue"/>