java中的反射

     大凡有名的開源框架都會使用java的反射技術，如struts2，spring... ... 。因此瞭解反射對我們來說還是非常重要的，在此我通過一個小小的例子來簡單說說反射中最重要類Class中api的簡單用法。

    實例是通過對javabean對象的拷貝來說明對部分api的使用。要更深入的理解大家可以調查相關資料。

爲了程序的整潔所有異常均拋出。在現實項目中可不能這樣哦^_^

package com.corp.util; import java.lang.reflect.Field; import java.lang.reflect.Method; public class Test { public static void main(String[] args) throws Exception { Test test = new Test(); Student student = new Student("001", "bj", 23, 60.5f); Student newStudent = (Student) test.clone(student); System.out.println(newStudent.getAddress() + "---" + (student == newStudent)); } public Object clone(Object object) throws Exception { Object newobj = null; if (object != null) { Class claz = object.getClass(); // 這個地方必須有默認構造函數(如果有顯示構造函數則無參構造函數要寫出來) newobj = claz.newInstance(); // 獲取javabean對象中的字段 Field[] fields = claz.getDeclaredFields(); for (Field field : fields) { String get = "get" + field.getName().substring(0, 1).toUpperCase() + field.getName().substring(1); String set = "set" + field.getName().substring(0, 1).toUpperCase() + field.getName().substring(1); Method getMethod = claz.getMethod(get, null); // 獲取原對象中的值 Object value = getMethod.invoke(object, null); Method setMethod = claz.getMethod(set, field.getType()); // 將原對象的值賦給新對象 setMethod.invoke(newobj, value); } } return newobj; } } class Student { private String id; private String address; private int age; private float weight; public Student() { } public Student(String id, String address, int age, float weight) { super(); this.id = id; this.address = address; this.age = age; this.weight = weight; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public float getWeight() { return weight; } public void setWeight(float weight) { this.weight = weight; } }  

反射api的使用就簡單介紹到這裏，祝大家愉快。