Java 反射 之 访问属性

http://www.verejava.com/?id=16995088370834

package com.reflect;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.TypeVariable;

import com.entity.Course;

public class TestField
{
    /**
     * 
     * @param args
     */
    public static void testGetDeclaredFields()
    {
        try
        {
            Class c=Class.forName("com.entity.Student");
            Field[] fields=c.getDeclaredFields();
            for(Field field:fields)
            {
                System.out.println(field.getName());
                System.out.println(field.getModifiers());
                if(field.getModifiers()==Modifier.PRIVATE)
                {
                    System.out.println("private");
                }
                
            }
        } catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        } 
    }
    public static void testField()
    {
        try
        {
            Class c=Class.forName("com.entity.Student");
            Object obj=c.newInstance();
            Field field=c.getDeclaredField("money");
            //强制访问
            field.setAccessible(true);
            field.setInt(obj, 1000);
            System.out.println(field.getInt(obj));
            
            field=c.getDeclaredField("address");
            field.setAccessible(true);
            field.set(obj, "北京");
            System.out.println(field.get(obj));
            
            field=c.getDeclaredField("course");
            field.setAccessible(true);
            field.set(obj, new Course("里哈",90));
            Course course=(Course)field.get(obj);
            System.out.println(course.getName()+","+course.getScore());
            
            
        } catch (Exception e)
        {
            e.printStackTrace();
        } 
    }
    public static void testType()
    {
        try
        {
            Class c=Class.forName("com.entity.Student");
            Object obj=c.newInstance();
            Field field=c.getDeclaredField("name");
            System.out.println(field.getType());
            System.out.println(field.getType().getSimpleName());
            if("java.lang.String".equals(field.getType().getName()))
            {
                System.out.println(true);
            }
            
        } catch (Exception e)
        {
            e.printStackTrace();
        } 
    }
    public static void main(String[] args)
    {
        testGetDeclaredFields();
    }
}





package com.entity;

public class Course
{
    private int id;
    private String name;
    private int score;
    
    public Course()
    {
        super();
    }
    public Course(String name, int score)
    {
        super();
        this.name = name;
        this.score = score;
    }
    public String getName()
    {
        return name;
    }
    public void setName(String name)
    {
        this.name = name;
    }
    public int getScore()
    {
        return score;
    }
    public void setScore(int score)
    {
        this.score = score;
    }
    public int getId()
    {
        return id;
    }
    public void setId(int id)
    {
        this.id = id;
    }
    
    
}





package com.entity;

public class Student
{
    private String name;
    private int age;
    private int money;
    private String address;
    private Course course;
    
    public Student()
    {
        super();
        System.out.println("student");
    }
    public Student(String name, int age)
    {
        super();
        this.name = name;
        this.age = age;
        System.out.println(this.name+","+this.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;
    }
    
    private String getHello()
    {
        return "hello";
    }
    
}





student2.xml 

<?xml version="1.0" encoding="UTF-8"?>

<data> 
  <student> 
    <name>李军</name>  
    <age>29</age> 
  </student>  
  <student> 
    <name>李浩</name>  
    <age>21</age> 
  </student> 
</data>

http://www.verejava.com/?id=16995088370834