java反射实例

[color=indigo][color=indigo]public class Student{
  private Integer sex ;
  private String typeName ="good";
  private Date sysdate  ;
  ...
}

public class TestcopyBean{

public static Student getMap() {[color=indigo]
   Student map = new Student();
   map.setSex(new Integer(1));
   map.setTypeName( "hao");
   map.setSysdate(new Date());
       return map;
}

public static void merge(Student map)
    throws SecurityException, NoSuchFieldException,
    NoSuchMethodException, IllegalArgumentException,
    InvocationTargetException, ClassNotFoundException, InstantiationException, IllegalAccessException {

Class c=map.getClass();
Field[] fields = c.getDeclaredFields();//得到此类所有的字段
//根据传入对象的类型，构造一个新的对象  
Object o = c.newInstance();


Method setmethod = null;
for (int i = 0; i < fields.length; i++) {
String fieldName = fields[i].getName();
            String setMethod = "set" + fieldName.substring(0, 1).toUpperCase() +
            fieldName.substring(1);//根据字段名拼凑其set方法名
            String getMethod = "get"+ fieldName.substring(0, 1).toUpperCase() +
            fieldName.substring(1);
           //根据方法的名字，取得Method对象，下面两行语句分别取得了get和set方法对象 
            setmethod = c.getDeclaredMethod(setMethod,new Class[]{fields[i].getType()});
            Method getMothod=c.getMethod(getMethod, new Class[]{});
           
            Object value=getMothod.invoke(map, new Object[]{});  
            setmethod.invoke(o, new Object[]{value});  

}
Student beano = (Student)o;
System.out.println(beano.getSex()+" "+beano.getTypeName()+" "+beano.getSysdate());


   }

public static void main(String[] args) throws DocumentException, SecurityException, IllegalArgumentException, NoSuchFieldException, NoSuchMethodException, InvocationTargetException, ClassNotFoundException, InstantiationException, IllegalAccessException{

merge(getMap());
}[/color][/color][/color]

评论

1 楼 wangsf 2009-12-23  

hao