JOX是一套用户XML document．和Java beans之间进行数据传递的JAVA类库

JOX是一套用户XML document．和Java beans之间进行数据传递的JAVA类库。

一个简单直接的JOX实例：
JOX是非常的简单易用。假设你现在已经有了下面的Java Bean。
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();
}
}

并且你已创建了下面的 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>
_{<age>35</age>
<name>Mark</name>}
</MarkTest>

下面的程序将读出XML并把数据存储于TestBean：
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();
}
}
}

你现在能作的就是创建FileInputStream或者FileReader去读取XML文件，并且把它打包进JOXBeanInputStream或者JOXBeanReader。接着你就可以让JOX读这个对象和该对象的类。
写一个输出XML文件的BEAN就这么简单啦^_^：
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();
}
}
}

你必须在这个Java Bean中设置一些值，创建一个用于写XML文件的输出流，用JOXBeanOutputStream或者JOXBeanWriter规定这个输出流，并 写相应的对象。以后，你就不必重复做这些工作啦^_^。只要你有了DTD,JOX就可以根据这个DTD识别根标签了。
为了后面的例子，我假定你已经创建了下面的DTD文件了：

<?xml version="1.0" encoding="ISO-8859-1"?>

<!ELEMENT MarkTest (Thingies*, foo?, BAR?, baz? S-U-B?)>

<!ELEMENT Thingies #PCDATA>
<!ELEMENT foo #PCDATA>
<!ELEMENT BAR #PCDATA>
<!ELEMENT baz #PCDATA>
<!ELEMENT S-U-B (age)>
<!ELEMENT age #PCDATA>
<!ATTLIST S-U-B name CDATA "">

下面的程序可以读取DTD文件并且传递给JOX,使JOX可以规范输出啦^_^：
package com.wutka.jox.test;
import com.wutka.jox.*;
import com.wutka.jox.dtd.*;
import java.io.*;

public class TestSerDTD
{
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");

FileReader reader = new FileReader("testbean.dtd");
Parser dtdParser = new Parser();

DTD dtd = dtdParser.parse(reader);
reader.close();

JOXBeanOutputStream joxOut = new JOXBeanOutputStream(dtd, fileOut);

joxOut.writeObject("MarkTest", b);

joxOut.close();
}
catch (Exception exc)
{
exc.printStackTrace();
}
}
}