java反射详解

转载地址为：

http://www.cnblogs.com/rollenholt/archive/2011/09/02/2163758.html

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个人备份地址：

链接：http://pan.baidu.com/s/1pLeS1cB 密码：eggc

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转载另一篇博客：

https://www.douban.com/note/306848299/

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package com.reflect;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.lang.reflect.Modifier;public class TestReflection {private String username;private String password;private int[] age;public void setUserName(String username) {this.username = username;}private void setPassWord(String password) {this.password = password;}public static void test01() throws ClassNotFoundException {Class c1 = TestReflection.class;Class c2 = Class.forName("com.reflect.TestReflection");// 获取指定的包名String package01 = c1.getPackage().getName();String package02 = c2.getPackage().getName();System.out.println("package01 = " + package01);System.out.println("package02 = " + package02);// 获取类的修饰符int mod = c1.getModifiers();String modifier = Modifier.toString(mod);System.out.println("modifier = " + modifier);// 获取指定类的完全限定名String className = c1.getName();System.out.println("className = " + className);// 获取指定类的父类Class superClazz = c1.getSuperclass();String superClazzName = superClazz.getName();System.out.println("superClazzName = " + superClazzName);// 获取实现的接口Class[] interfaces = c1.getInterfaces();for (Class t : interfaces) {System.out.println("interfacesName = " + t.getName());}// 获取指定类的成员变量Field[] fields = c1.getDeclaredFields();for (Field field : fields) {modifier = Modifier.toString(field.getModifiers()); // 获取每个字段的访问修饰符Class type = field.getType(); // 获取字段的数据类型所对应的Class对象String name = field.getName(); // 获取字段名if (type.isArray()) { // 如果是数组类型则需要特别处理String arrType = type.getComponentType().getName() + "[]";System.out.println("" + modifier + " " + arrType + " " + name + ";");} else {System.out.println("" + modifier + " " + type + " " + name + ";");}}// 获取类的构造方法Constructor[] constructors = c1.getDeclaredConstructors();for (Constructor constructor : constructors) {String name = constructor.getName(); // 构造方法名modifier = Modifier.toString(constructor.getModifiers()); // 获取访问修饰符System.out.print("" + modifier + " " + name + "(");Class[] paramTypes = constructor.getParameterTypes(); // 获取构造方法中的参数for (int i = 0; i < paramTypes.length; i++) {if (i > 0) {System.out.print(",");}if (paramTypes[i].isArray()) {System.out.print(paramTypes[i].getComponentType().getName() + "[]");} else {System.out.print(paramTypes[i].getName());}}System.out.println(");");}// 获取成员方法Method[] methods = c1.getDeclaredMethods();for (Method method : methods) {modifier = Modifier.toString(method.getModifiers());Class returnType = method.getReturnType(); // 获取方法的返回类型if (returnType.isArray()) {String arrType = returnType.getComponentType().getName() + "[]";System.out.print("" + modifier + " " + arrType + " " + method.getName() + "(");} else {System.out.print("" + modifier + " " + returnType.getName() + " " + method.getName() + "(");}Class[] paramTypes = method.getParameterTypes();for (int i = 0; i < paramTypes.length; i++) {if (i > 0) {System.out.print(",");}if (paramTypes[i].isArray()) {System.out.print(paramTypes[i].getComponentType().getName() + "[]");} else {System.out.print(paramTypes[i].getName());}}System.out.println(");");}}public static void test02() throws InstantiationException, IllegalAccessException, SecurityException,NoSuchMethodException, IllegalArgumentException, InvocationTargetException {// 反射调用方法，可以通过Method类的invoke方法实现动态方法的调用// public Object invoke(Object obj, Object... args)// 第一个参数代表对象// 第二个参数代表执行方法上的参数// 若反射要调用类的某个私有方法，可以在这个私有方法对应的Mehtod对象上先调用setAccessible(true)Class c1 = TestReflection.class;TestReflection t1 = (TestReflection) c1.newInstance(); // 利用反射来创建类的对象System.out.println("username == " + t1.username);System.out.println("password == " + t1.password);Method method = c1.getDeclaredMethod("setUserName", String.class);method.invoke(t1, "Java反射的学习");System.out.println("username == " + t1.username);method = c1.getDeclaredMethod("setPassWord", String.class);method.setAccessible(true);method.invoke(t1, "反射执行某个Private修饰的方法");System.out.println("password == " + t1.password);}public static void main(String[] args) throws ClassNotFoundException, SecurityException, IllegalArgumentException,InstantiationException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {test01();test02();}}