一、代码说明

1、获取指定class文件中的公共方法

/*** @throws Exception ** @Title: getMethodDemo * @Description: 获取指定class文件中的公共方法* @param * @return void* @throws */private static void getMethodDemo() throws Exception {String name = "com.lh.reflection.bean.Person";// 寻找该类名称字节码文件 ，并加载至内存，生成Class对象Class<Person> clazz = (Class<Person>) Class.forName(name);Method[] methods = clazz.getMethods();//获取的都是公有的方法methods = clazz.getDeclaredMethods();//获取的是本类的所有方法，包含私有方法for(Method mehtod: methods){System.out.println(mehtod);}}

2、反射调用无参方法

/*** @throws Exception ** @Title: getMethodDemo2 * @Description: 反射调用无参方法* @param * @return void* @throws */private static void getMethodDemo2() throws Exception {String name = "com.lh.reflection.bean.Person";// 寻找该类名称字节码文件 ，并加载至内存，生成Class对象Class<Person> clazz = (Class<Person>) Class.forName(name);//     Method method = clazz.getMethod("show",null);Method method = clazz.getMethod("show");//       Person person = clazz.newInstance();Constructor<Person> constructor = clazz.getConstructor(String.class,int.class);Person person = constructor.newInstance("小明",20);//       method.invoke(person,null);method.invoke(person);}

3、反射调用有参方法

/*** @throws Exception ** @Title: getMethodDemo3 * @Description: 反射调用有参方法* @param * @return void* @throws */private static void getMethodDemo3() throws Exception {String name = "com.lh.reflection.bean.Person";// 寻找该类名称字节码文件 ，并加载至内存，生成Class对象Class<Person> clazz = (Class<Person>) Class.forName(name);Method method = clazz.getMethod("paramMethod", String.class,int.class);Person person = clazz.newInstance();method.invoke(person, "小明",20);}

4、反射调用静态无参方法

/*** @throws Exception ** @Title: getMethodDemo4 * @Description: 反射调用静态无参方法* @param * @return void* @throws */private static void getMethodDemo4() throws Exception {String name = "com.lh.reflection.bean.Person";// 寻找该类名称字节码文件 ，并加载至内存，生成Class对象Class<Person> clazz = (Class<Person>) Class.forName(name);Method method = clazz.getMethod("staticMethod");Person person = clazz.newInstance();method.invoke(person);}

5、Person类

/**
* @Title: Person.java
* @Package com.lh.reflection.bean
* @Description: TODO
* @author Liu
* @date 2018年1月23日 下午3:06:10
* @version V1.0
*/
package com.lh.reflection.bean;/*** @ClassName: Person* @Description: Person实体类* @author Liu* @date 2018年1月23日 下午3:06:10* */
public class Person {private int age;private String name;public Person() {System.out.println("constructor no param run...");}public Person(String name,int age) {this.age = age;this.name = name;System.out.println("constructor with param run..." + this.name + ":" + this.age);}public void show() {System.out.println(name + "...show run..." + age);}private void privateMethod() {System.out.println("method run");}public void paramMethod(String str, int num) {System.out.println("paramMethod run..." + str + ":" + num);}public static void staticMethod() {System.out.println("static method run...");}}