java反射机制动态调用 Java反射根据不同方法名动态调用不同的方法(实例)

public class Person {

  private String name;
  private int age;
  private String address;
  private String phoneNumber;
  private String sex;


  public String getName() {
    return name;
  }
// 以下是get 和set方法，省略。
}

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

public class Test {

  // init person object.
  private Person initPerson() {
    Person p = new Person();

    p.setName("name");
    p.setAge(21);
    p.setAddress("this is my addrss");
    p.setPhoneNumber("12312312312");
    p.setSex("f");

    return p;
  }
  
  public static void main(String[] args) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
    Test test = new Test();
    Person p = test.initPerson();
    List<String> list = new ArrayList<String>();

    // Add all get method.

    // There is no ‘()' of methods name.

    list.add("getName");
    list.add("getAge");
    list.add("getAddress");
    list.add("getPhoneNumber");
    list.add("getSex");
    
    for (String str : list) {

  // Get method instance. first param is method name and second param is param type.

  // Because Java exits the same method of different params, only method name and param type can confirm a method.

      Method method = p.getClass().getMethod(str, new Class[0]);

  // First param of invoke method is the object who calls this method.

  // Second param is the param.

      System.out.println(str + "(): Get Value is  " + method.invoke(p, new Object[0]));
    }
  }
}

public static void getValueByProperty(Person p, String propertyName) throws IntrospectionException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
    // get property by the argument propertyName.
    PropertyDescriptor pd = new PropertyDescriptor(propertyName, p.getClass());
    Method method = pd.getReadMethod();
    Object o = method.invoke(p);
    System.out.println("propertyName: " + propertyName + "\t  value is:  " + o);
  }
  
  public static void main(String[] args) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, IntrospectionException {
    Test test = new Test();
    Person p = test.initPerson();
    

// get all properties.
    Field[] fields = p.getClass().getDeclaredFields();
    for (Field field : fields) {
      getValueByProperty(p, field.getName());
    } 
  }