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>Moe</thingies>
<thingies>Larry</thingies>
<thingies>Curly</thingies>
<thingies>Shemp</thingies>
<thingies>Curly Joe</thingies>
<foo>5</foo>
<baz>6/25/00 12:46 AM</baz>
<bar>This is the bar value</bar>
<sub>
<age>35</age>
<name>Mark</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[] {
"Moe", "Larry", "Curly", "Shemp", "Curly Joe" });
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