Java反射

通过反射机制操作一个JavaBean

package org.cqut.java.reflection;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;public class CopyObject {public Object copyObject(Object object) throws Exception {// 1.获取待操作类的一个Class对象Class<?> classType = object.getClass();// 2.获取待操作类的一个实例赋值给copyObjConstructor<?> constructor = classType.getConstructor(new Class<?>[] {});Object copyObj = constructor.newInstance(new Object[] {});// 3.获取被拷贝类的成员变量Field[] fields = classType.getDeclaredFields();// 4.通过Method类操作待操作类方法for (Field field : fields) {String name = field.getName();// 遍历获取成员变量名字；// 5.操作字符串获取成员变量的set和get方法名字；String firstLetter = name.substring(0, 1).toUpperCase();String getMethodName = "get" + firstLetter + name.substring(1);String setMethodName = "set" + firstLetter + name.substring(1);//Class类getMethod返回特定方法的一个Method类实例Method getMethod = classType.getMethod(getMethodName,new Class<?>[] {});Method seMethod = classType.getMethod(setMethodName,new Class<?>[] { field.getType() });//调用Method类invoke方法调用反射类的实例Object value = getMethod.invoke(object, new Object[] {});seMethod.invoke(copyObj, new Object[] { value });}return copyObj;}public static void main(String[] args) throws Exception {Student student = new Student("Tom", 21);student.setId(111030805);CopyObject copy = new CopyObject();Student student2 = (Student) copy.copyObject(student);System.out.println(student2.getId() + " " + student2.getName() + " "+ student2.getAge());}}// 一个被反射的JavaBeanclass Student {private long id;private String name;private int age;public Student() {}public Student(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public long getId() {return id;}public void setId(long id) {this.id = id;}}