反射取类中的所有字段的值

class Person {

private String name;

private String age;

private Children children;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAge() {
return age;
}

public void setAge(String age) {
this.age = age;
}

public Children getChildren() {
return children;
}

public void setChildren(Children children) {
this.children = children;
}

}

class Children {

private String name;

private String age;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAge() {
return age;
}

public void setAge(String age) {
this.age = age;
}
}
接下来我们来写一个测试函数

  public Class test{
  public static void main(String[] args){
  Children c = new Children();
  c.setName("Lincoln");
  c.setAge("18");
  Person p = new Person();
  p.setName("kenny");
  p.setage("28");
  p.setChildren(c);

  Class<? extends Person> persons = p.getClass();
// 把类的所有属性放进一个List里面。Field类是java里面的反射机制的一个类，你可以去查查API
  List<Field> fields = new ArrayList<Field>();
  Collections.addAll(fields,personClass.getDeclaredFields());
   
  for(Field field : fields){
//设置访问权限
  field.setAccessible(true);
//获得当前Object的属性
  Object personField = field.get(p);
//判断属性的类型，如果是POJO则通过反射机制提取其属性显示
  if( personField instanceof Children){
  Children ch = (Children)personField;
Class<? extends Children> childrenClass = ch.getClass();
List<Field> chfields = new ArrayList<Field>();
Collections.addAll(chfields, childrenClass.getDeclaredFields());
for(Field f : chfields){
f.setAccessible(true);
Object chField = f.get(children);
System.out.println(chField.toString());
}
  }
  }else{
  System.out.println(personField.toString());
  }  
  }
}

运行结果为
kenny
28
lincoln
18