通过JOX轻松实现JavaBeans与XML的相互转换

不用复杂的代码，就可以让您的JavaBeans自己控制到XML文件的相互转化。本文展示了怎样通过JOX来实现从JavaBeans到XML文件的相互转换。

为了灵活的满足Web应用和Web services需求的变化，Java和XML的轻便性和可扩展性使它们成为解决这一问题的理想选择。SAX (Simple API for XML), DOM (document．nbspObject Model), XSL (Extensible Stylesheet Language), XSLT (XSL Transformations), SOAP (Simple Object Access Protocol), and BML (Bean Markup Language)是XML领域内的相关技术。本文集合了Java和XML轻便和可扩展的优点，但又不需要开发人员了解上述的相关技术。
在Java分布式应用中使用远程方法调用（RMI），而不是直接用底层的socket或其它网络链接代码。EJB技术也使开发人员从transaction，recovery, activation等底层机制中解放出来。同样，使用本文的JavaBean－XML映射组件，开发人员也不用直接处理与XML有关的APIs。

1.先定义javaBean


package com.wutka.jox.test;




import com.wutka.jox.*;


import java.util.*;




public class TestBean implements java.io.Serializable






{


protected int foo;


protected String bar;


protected java.util.Date baz;


protected Vector thingies;


protected TestSubbean subbean;




public TestBean()






{


bar = "";


baz = new Date();


thingies = new Vector();


}






public int getFoo()

{ return foo; }




public void setFoo(int aFoo)

{ foo = aFoo; }






public String getBar()

{ return bar; }




public void setBar(String aBar)

{ bar = aBar; }






public java.util.Date getBaz()

{ return baz; }




public void setBaz(java.util.Date aBaz)

{ baz = aBaz; }






public TestSubbean getSub()

{ return subbean; }




public void setSub(TestSubbean aSub)

{ subbean = aSub; }




public String[] getThingies()






{


String[] retThingies = new String[thingies.size()];


if (thingies.size() > 0) thingies.copyInto(retThingies);




return retThingies;


}




public void setThingies(String[] newThingies)






{


thingies = new Vector(newThingies.length);


for (int i=0; i < newThingies.length; i++)






{


thingies.addElement(newThingies[i]);


}


}




public String getThingies(int i)






{


return (String) thingies.elementAt(i);


}




public void setThingies(int i, String thingy)






{


thingies.setElementAt(thingy, i);


}




public String toString()






{


StringBuffer ret = new StringBuffer(


"foo="+foo+";bar="+bar+";baz="+baz.toString()+


";thingies=");


for (int i=0; i < thingies.size(); i++)






{


if (i > 0) ret.append(",");


ret.append((String) thingies.elementAt(i));


}




ret.append(";sub=");


ret.append(subbean.toString());




return ret.toString();


}


}





2.xml文件


<?xml version="1.0"?>


<MarkTest>


<thingies>http://www.5a520.cn 小说520网</thingies>


<thingies>http://www.bt285.cn BT下载</thingies>


<thingies>http://www.bt285.cn/caj/ caj下载</thingies>


<thingies>http://www.bt285.cn/baolimotuo/ 暴力摩托</thingies>


<thingies>http://www.bt285.cn/btjinglin bt精灵</thingies>


<foo>5</foo>


<baz>6/25/00 12:46 AM</baz>


<bar>This is the website value</bar>


<sub>


<age>1</age>


<name>wangdei</name>


</sub>


</MarkTest>



下面的程序是把xml转为成javaBean


package com.wutka.jox.test;




import com.wutka.jox.*;


import java.io.*;




public class TestDeser






{


public static void main(String[] args)






{


try






{


FileInputStream in = new FileInputStream("bean.xml");




JOXBeanInputStream joxIn = new JOXBeanInputStream(in);




TestBean testBean = (TestBean) joxIn.readObject(


TestBean.class);




System.out.println(testBean);


}


catch (Exception exc)






{


exc.printStackTrace();


}


}


}



下面的程序是把javaBean转为成xml


package com.wutka.jox.test;




import com.wutka.jox.*;


import java.io.*;




public class TestSer






{


public static void main(String[] args)






{


try






{


TestBean b = new TestBean();


b.setFoo(5);


b.setBar("This is the bar value");




b.setThingies(new String[]

{


"http://www.5a520.cn 小说520网", "http://www.bt285.cn BT下载", "http://www.bt285.cn/caj/ caj下载", "http://www.bt285.cn/baolimotuo/ 暴力摩托", "http://www.bt285.cn/btjinglin bt精灵" });


TestSubbean sub = new TestSubbean();


sub.setName("Mark");


sub.setAge(35);


b.setSub(sub);




FileOutputStream fileOut = new FileOutputStream("bean.xml");


JOXBeanOutputStream joxOut = new JOXBeanOutputStream(fileOut);




joxOut.writeObject("MarkTest", b);




joxOut.close();


}


catch (Exception exc)






{


exc.printStackTrace();


}


}


}



参考网址: http://www.wutka.com/joxdownload.html jox下载
http://www.wutka.com/jox.html 主页