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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