Java异常处理之InvocationTargetException(反射异常)
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Java异常处理之InvocationTargetException(反射异常)
InvocationTargetException异常由Method.invoke(obj, args...)方法抛出。
当被调用的方法的内部抛出了异常而没有被捕获时,将由此异常接收!!!
示例:
- package com.zzj.test.reflect;
- public class Reflect {
- public void run(int i) throws ZeroException {
- B b = new B();
- b.run(i);
- }
- }
- class B {
- public void run(int i) throws ZeroException {
- if (i < 0) {
- throw new ZeroException("参数不能小于零!");
- }
- System.out.println("参数:" + i);
- }
- }
- class ZeroException extends Exception {
- private static final long serialVersionUID = 1L;
- private String detailMessage;
- public ZeroException(String detailMessage) {
- this.detailMessage = detailMessage;
- }
- public String getMessage() {
- return detailMessage;
- }
- }
测试:
- package com.zzj.test.reflect;
- import java.lang.reflect.InvocationTargetException;
- import java.lang.reflect.Method;
- public class Test {
- public static void main(String[] args) {
- try {
- Class<?> clazz = Class.forName("com.zzj.test.reflect.Reflect");
- Method method = clazz.getMethod("run", int.class);
- method.invoke(clazz.newInstance(), -1);
- } catch (ClassNotFoundException e) {
- e.printStackTrace();
- } catch (SecurityException e) {
- e.printStackTrace();
- } catch (NoSuchMethodException e) {
- e.printStackTrace();
- } catch (IllegalArgumentException e) {
- e.printStackTrace();
- } catch (IllegalAccessException e) {
- e.printStackTrace();
- } catch (InvocationTargetException e) {
- System.out.println("此处接收被调用方法内部未被捕获的异常");
- e.printStackTrace();
- } catch (InstantiationException e) {
- e.printStackTrace();
- }
- }
- }
输出:
- 此处接收被调用方法内部未被捕获的异常
- java.lang.reflect.InvocationTargetException
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
- at java.lang.reflect.Method.invoke(Unknown Source)
- at com.zzj.test.reflect.Test.main(Test.java:11)
- Caused by: com.zzj.test.reflect.ZeroException: 参数不能小于零!
- at com.zzj.test.reflect.B.run(Reflect.java:13)
- at com.zzj.test.reflect.Reflect.run(Reflect.java:6)
- ... 5 more
也可以直接打印目标异常:
- package com.zzj.test.reflect;
- import java.lang.reflect.InvocationTargetException;
- import java.lang.reflect.Method;
- public class Test {
- public static void main(String[] args) {
- try {
- Class<?> clazz = Class.forName("com.zzj.test.reflect.Reflect");
- Method method = clazz.getMethod("run", int.class);
- method.invoke(clazz.newInstance(), -1);
- } catch (ClassNotFoundException e) {
- e.printStackTrace();
- } catch (SecurityException e) {
- e.printStackTrace();
- } catch (NoSuchMethodException e) {
- e.printStackTrace();
- } catch (IllegalArgumentException e) {
- e.printStackTrace();
- } catch (IllegalAccessException e) {
- e.printStackTrace();
- } catch (InvocationTargetException e) {
- System.out.println("此处接收被调用方法内部未被捕获的异常");
- Throwable t = e.getTargetException();// 获取目标异常
- t.printStackTrace();
- } catch (InstantiationException e) {
- e.printStackTrace();
- }
- }
- }
输出:
- 此处接收被调用方法内部未被捕获的异常
- com.zzj.test.reflect.ZeroException: 参数不能小于零!
- at com.zzj.test.reflect.B.run(Reflect.java:13)
- at com.zzj.test.reflect.Reflect.run(Reflect.java:6)
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
- at java.lang.reflect.Method.invoke(Unknown Source)
- at com.zzj.test.reflect.Test.main(Test.java:11)
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