泉州做企业网站,无锡网站建设营销型,微信如何建立自己的公众号,中国空间站和国际空间站对比通过反射技术我们将上面的统一资源定位付(URL) 映射到Class 相当于class: newsmethod: listparameter: 2差不多就是下面样子class News{public String list(String catagory_id){......}}我们只需要在框架核心中分析 url 然后调用对应的方法#xff0c;于此同时将参数传递过去…通过反射技术我们将上面的统一资源定位付(URL) 映射到Class 相当于class: newsmethod: listparameter: 2差不多就是下面样子class News{public String list(String catagory_id){......}}我们只需要在框架核心中分析 url 然后调用对应的方法于此同时将参数传递过去。Class cls Class.forName(cn.netkiller.reflect.News);Object obj cls.newInstance();Method method cls.getDeclaredMethod(list, int.class);return method.invoke(obj, 2);1.9. Reflection 反射this.getClass().getName() //当前Class名字Thread.currentThread().getStackTrace()[1].getMethodName()); //当前方法名1.9.1. 获得所有变量Field[] fields objClass.getFields();for (Field field : fields) {System.out.println(field.getName());}注意只能去除 public变量1.9.2. 批量赋值1.9.3. 方法操作下载JAVA反射调用方法的步骤有三步得到要调用类的class得到要调用的类中的方法(Method)方法调用(invoke)1.9.3.1. 获得所有方法Class objClass a.getClass();Method[] methods objClass.getDeclaredMethods();for (Method method : methods) {System.out.println(method);}1.9.3.2. set/get 方法下载package cn.netkiller.reflect;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class Member {public String name;private int 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;}Overridepublic String toString() {return ClassA [name name , age age ];}public Member() {// TODO Auto-generated constructor stub}public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {Class cls Class.forName(cn.netkiller.reflect.Member);Object member cls.newInstance();Method setMethod cls.getDeclaredMethod(setAge, int.class);setMethod.invoke(member, 15);Method getMethod cls.getDeclaredMethod(getAge);System.out.println(getMethod.invoke(member));}}下面做一个稍微复杂点的例子ClassB继承ClassA取出ClassA的成员变量赋值到ClassA。下载package cn.netkiller.reflect;public class ClassA {public String name;private int 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 ClassA() {// TODO Auto-generated constructor stub}Overridepublic String toString() {return ClassA [name name , age age ];}}package cn.netkiller.reflect;public class ClassB extends ClassA{public ClassB() {// TODO Auto-generated constructor stub}private String address;public String getAddress() {return address;}public void setAddress(String address) {this.address address;}Overridepublic String toString() {return ClassB [address address ];}}package cn.netkiller.reflect;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class ReflectionTest {public ReflectionTest() {// TODO Auto-generated constructor stub}下载public void testSetMethod() throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException {// ClassA a new ClassA();ClassB b new ClassB();b.setAddress(Shenzhen);Class classA ClassA.class;ClassA a classA.newInstance();a.setName(Neo);a.setAge(30);System.out.println(classA.getDeclaredMethod(getAge).invoke(a));Method m classA.getDeclaredMethod(setAge, int.class);m.setAccessible(true); // 因为写成private 所以这里必须设置m.invoke(b, 26);System.out.println(a.toString());System.out.println(b.toString());System.out.println(b.getName());System.out.println(b.getAge());}public static void main(String[] args) throws InvocationTargetException {ReflectionTest rt new ReflectionTest();try {rt.testSetMethod();} catch (NoSuchMethodException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InstantiationException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}set 方法System.out.println(classA.getDeclaredMethod(getAge).invoke(a));get 方法Method m classA.getDeclaredMethod(setAge, int.class);m.setAccessible(true);//因为写成private 所以这里必须设置m.invoke(b, 26);1.9.3.3. static 方法调用Class cls Class.forName(cn.netkiller.reflect.Student);Method setMethod cls.getDeclaredMethod(setAge,int.class);setMethod.invoke(cls.newInstance(), 15);
