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JOX(关于Java处理xml文档的讨论)

时间:2009-12-23 15:42来源:未知 作者:admin 点击:
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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.w

  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>
  <sub>
  <age>35</age>
  <name>Mark</name>
  </sub>
  </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();
  }
  }
  }
  
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