//返回类中所有内部类，这里的类包括数组、接口等@CallerSensitive public Class<?>[] getDeclaredClasses() throws SecurityException { checkMemberaccess(Member.DECLARED, Reflection.getCallerClass(), false);//检查访问权限，下同 return getDeclaredClasses0(); }/** * 1.getDeclaredClasses()：返回类中定义的公共、私有、保护的、默认的（即所有访 * 问属性限制的）内部类，包括接口，不包括匿名内部类，以及继承的内部类，如果没有或此 * Class对象表示的是基本类型、数组类或 Void，则返回长度为零的数组**/——————————————————————————————————————————————————————————————————//返回类中成员字段@CallerSensitive public Field[] getDeclaredFields() throws SecurityException { checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); return copyFields(PRivateGetDeclaredFields(false)); }/** * 2.getDeclaredFields()：返回类中所有字段，不管是私有的还是公有、默认、保护 * 的，但不包括继承的，若此Class对象表示的是基本类型、数组类或 Void，则返回长度为 * 零的数组 */——————————————————————————————————————————————————————————————————//返回类中所有成员方法@CallerSensitive public Method[] getDeclaredMethods() throws SecurityException { checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); return copyMethods(privateGetDeclaredMethods(false)); }/** * 3.getDeclaredMethods()：同上，但返回的是Method数组，即获取类中所有的方法 */——————————————————————————————————————————————————————————————————//返回类中所有构造器@CallerSensitive public Constructor<?>[] getDeclaredConstructors() throws SecurityException { checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); return copyConstructors(privateGetDeclaredConstructors(false)); }/** * 4.getDeclaredMethods()：同上，但返回的是Constructor数组，即获取类中所有的 * 构造器 */——————————————————————————————————————————————————————————————————//返回对应的字段Field对象@CallerSensitive public Field getDeclaredField(String name) throws NoSuchFieldException, SecurityException { checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); Field field = searchFields(privateGetDeclaredFields(false), name); if (field == null) { throw new NoSuchFieldException(name); } return field; }/** * 5.getDeclaredField()：对给出的name获取对应的类中的字段（Field对象） * 若不存在，则抛出NoSuchFieldException异常 */——————————————————————————————————————————————————————————————————//返回对应的Method对象,name是方法名称，parameterTypes是对应形参@CallerSensitive public Method getDeclaredMethod(String name, Class<?>... parameterTypes) throws NoSuchMethodException, SecurityException { checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); if (method == null) { throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); } return method; }/** * 6.getDeclaredMethod()：对给出的name获取对应的类中的方法（Method对象） * 若不存在，则抛出NoSuchMethodException异常 */——————————————————————————————————————————————————————————————————//类似上面的getDeclaredMethod@CallerSensitive public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) throws NoSuchMethodException, SecurityException { checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); return getConstructor0(parameterTypes, Member.DECLARED); }//获取参数中指定的资源，以字节流返回public InputStream getResourceAsStream(String name) { name = resolveName(name); ClassLoader cl = getClassLoader0(); if (cl==null) { return ClassLoader.getSystemResourceAsStream(name); } return cl.getResourceAsStream(name); }//获取参数中指定的资源，以URL对象返回public java.net.URL getResource(String name) { name = resolveName(name); ClassLoader cl = getClassLoader0(); if (cl==null) { return ClassLoader.getSystemResource(name); } return cl.getResource(name); }//关于getResource() 可以参考//http://www.cnblogs.com/yejg1212/p/3270152.htmlprivate static java.security.ProtectionDomain allPermDomain;//Java的保护域，以下关于Java安全管理机制及策略相关知识，我自己也没看233public java.security.ProtectionDomain getProtectionDomain() { }private native java.security.ProtectionDomain getProtectionDomain0();native void setProtectionDomain0(java.security.ProtectionDomain pd); static native Class getPrimitiveClass(String name);private static class SecurityManagerHelper {}private static volatile SecurityManagerHelper smHelper;private static boolean isCheckMemberAccessOverridden(SecurityManager sm) {}private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) {}private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) {private String resolveName(String name) {}private static class Atomic {//原子操作支持private static boolean useCaches = true;static class ReflectionData<T> {//反射获得信息类集合 volatile Field[] declaredFields; volatile Field[] publicFields; volatile Method[] declaredMethods; volatile Method[] publicMethods; volatile Constructor<T>[] declaredConstructors; volatile Constructor<T>[] publicConstructors; // Intermediate results for getFields and getMethods volatile Field[] declaredPublicFields; volatile Method[] declaredPublicMethods; // Value of classRedefinedCount when we created this ReflectionData instance final int redefinedCount; ReflectionData(int redefinedCount) { this.redefinedCount = redefinedCount; } }
关于checkMemberAccess()，默认是要做访问权限检查的，所谓的访问权限，即public/protected/默认/private修饰权限，如果反射想要访问没权限访问的字段(属性)、方法等，可以进行设置从而获得访问权限，比如字段：Field field = fields.get(0);field.setAccessible(true);才能访问private等修饰的字段值
