JavaBean和BeanUtils

JavaBean和BeanUtils

/**
 * 改类掩饰了如何通过java.bean的类去获知bean中的属性并调用相应的set get方法
  */
import  java.beans. * ;
import  java.lang.reflect.Method;
public   class  JavaBeanInvoke {
     public   static   void  main(String args[]) throws  Exception{
        test1();
    }
    
     public   static   void  test1() throws  Exception{
        Person person  =  Person. class .newInstance();
        
        BeanInfo beaninfo  =  Introspector.getBeanInfo(Person. class );
        PropertyDescriptor[] porpertydescriptors  =  beaninfo.getPropertyDescriptors();
         for (PropertyDescriptor pd:porpertydescriptors){
            System.out.println(pd.getName());
             if (pd.getName().endsWith( " name " )){
                Method setMethod = pd.getWriteMethod();
                Method getMethod = pd.getReadMethod();
                setMethod.invoke(person, " ShenZiping " );
                System.out.println(getMethod.invoke(person));
                 break ;
            }
        }
    }
    
     public   static   void  test2()  throws  Exception{
        Person person  =  Person. class .newInstance();
        PropertyDescriptor pd  =   new  PropertyDescriptor( " age " ,Person. class );
        Method setMethod  =  pd.getWriteMethod();
        Method getMethod  =  pd.getReadMethod();
        setMethod.invoke(person,  56 );
        System.out.println(getMethod.invoke(person));
    }
}

/**
 * 代码举例了beanUtil包的普遍用法，需要apache的logging包和beanUtils包
  */
import  java.text.ParseException;
import  java.text.SimpleDateFormat;
import  java.util.Date;
import  java.util.HashMap;
import  java.util.Map;

import  org.apache.commons.beanutils. * ;
public   class  BeanUtilsInvoke {
     public   static   void  main(String args[]) throws  Exception{
        test1();
        test2();
        test3();
        test4();
        myConvertTest();
    }
     public   static   void  test1() throws  Exception{
        Person person  =   new  Person();
        BeanUtils.copyProperty(person,  " name " ,  " ShenZiping " );
        System.out.println( " test1 " + person.getName());
    }
     public   static   void  test2()  throws  Exception{
        Person person  =   new  Person();
        Map < String, String >  map  =   new  HashMap < String, String > ();
        map.put( " name " ,  " ShenZiping " );
        map.put( " age " ,  " 65 " );
        BeanUtils.populate(person, map);
        System.out.println( " test2 " + person.getAge());
        System.out.println( " test2 " + person.getName());
    }
    
     public   static   void  test3()  throws  Exception{
        Person p1  =   new  Person();
        Person p2  =   new  Person();
        p1.setAge( 98 );
        p1.setName( " ShenZiping " );
        BeanUtils.copyProperties(p2, p1);
        System.out.println( " test3 " + p2.getAge());
        System.out.println( " test3 " + p2.getName());
    }
    
     public   static   void  test4()  throws  Exception{
        Person person  =   new  Person();
        Man man  =   new  Man();
        person.setName( " ShenZiping " );
        BeanUtils.copyProperties(man, person);
        System.out.println( " test4 " + man.getName());
    }
    
     public   static   void  myConvertTest(){
        ConvertUtils.register( new  Converter(){
             public  Object convert(Class clazz, Object value){
                 if (clazz == Date. class ){
                    SimpleDateFormat dateFormat  =   new  SimpleDateFormat( " yyyy-MM-dd " );
                     try {
                         return  dateFormat.parse((String)value);
                    } catch (ParseException e){
                         throw   new  RuntimeException( " invalid format " );
                    }
                }
                 return   null ;
            }
        }, Date. class );
        Date date  =  (Date)ConvertUtils.convert( " 2010-01-15 " ,Date. class );
        System.out.println( " myConvertTest " + date);
    }
}