immute.html

来自「java类库详细讲解」· HTML 代码 · 共 165 行

HTML
165 行
字号 
<HTML>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<TITLE>Serializing an Immutable Bean Property to XML
(Java Developers Almanac Example)
</TITLE>
<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
<META CONTENT="Addison-Wesley/Patrick Chan" NAME="OWNER">
<META CONTENT="3/20/02" NAME="revision">
<STYLE TYPE="text/css">
<!--     BODY CODE  {font-family: Courier, Monospace;           font-size: 11pt}    TABLE, BODY          {font-family: Verdana, Arial, Helvetica, sans-serif;           font-size: 10pt}    PRE   {font-family: Courier, Monospace;           font-size: 10pt}    H3    {font-family: Verdana, Arial, Helvetica, sans-serif;           font-size: 11pt}    A.eglink {text-decoration: none}    A:hover.eglink {text-decoration: underline}    -->
</STYLE>
</HEAD>
<BODY>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD rowspan="3"><A HREF="/?l=ex"><IMG BORDER="0" ALIGN="BOTTOM" HSPACE="10" SRC="/egs/almanac14a.jpg"></A></TD><TD VALIGN="top"><font face="Times" size="6"><b>The Java Developers Almanac 1.4</b></font>
<br>
        Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
    </TD>
</TR>
<TR>
<TD align="right" valign="bottom">
<FORM method="get" action="/cgi-bin/search/find.pl">
<INPUT size="25" name="words" type="text"><INPUT value="Search" type="submit">
</FORM>
</TD>
</TR>
</TABLE>
<HR color="#6666cc">
<DIV ALIGN="LEFT">
<A HREF="/">Home</A>
    &gt;
    <A HREF="../index.html">List of Packages</A>
    &gt;
    <B><A HREF="../java.beans/pkg.html">java.beans</A></B><font color="#666666" SIZE="-2">
        &nbsp;[12 examples]
        </font>
        &gt;
        <B><A HREF="../java.beans/pkg.html#Serialization">Serialization</A></B><font color="#666666" SIZE="-2">
            &nbsp;[4 examples]
            </font>
</DIV><P>
  <h3>
    e10.  
    Serializing an Immutable Bean Property to XML</h3>

An immutable property is one where the value is supplied to the
constructor rather than through a setter method.  By default,
immutable properties are not persisted.  This example demonstrates how
to persist an immutable property called <code>prop</code>.



<pre>
    // Create an object with an immutable property and set the value
    // of the immutable property in the constructor
    <font color="#0066ff"><i>MyClass3</i></font> o = new <font color="#0066ff"><i>MyClass3</i></font>(<font color="#0066ff"><i>123</i></font>);
    
    try {
        // Create the encoder
        XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(
            new FileOutputStream(<font color="#0066ff"><i>"outfilename.xml"</i></font>)));
    
        // Specify to the encoder, the name of the property that is associated
        // with the constructor's parameter(s)
        String[] propertyNames = new String[]{<font color="#0066ff"><i>"prop"</i></font>};
        encoder.setPersistenceDelegate(<font color="#0066ff"><i>MyClass3</i></font>.class,
            new DefaultPersistenceDelegate(propertyNames);
    
        // Serialize the object into XML
        encoder.writeObject(o);
        encoder.close();
    } catch (FileNotFoundException e) {
    }
</pre>


<pre>
    // This class defines an immutable property called prop.
    // The value of the immutable property is initialized
    import java.beans.*;
    public class <font color="#0066ff"><i>MyClass3</i></font> {
        int prop;
        // The constructor that initializes the immutable property prop
        public <font color="#0066ff"><i>MyClass3</i></font>(int prop) {
            this.prop = prop;
        }
    
        // The immutable property
        public int getProp() {
            return prop;
        }
    }
</pre>
Here is the XML data:

<pre>
    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
    &lt;java version="1.4.0" class="java.beans.XMLDecoder"&gt;
        &lt;object class="MyClass3"&gt;
            &lt;int&gt;123&lt;/int&gt;
        &lt;/object&gt;
    &lt;/java&gt;
</pre>
<P><table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td bgcolor="#6666cc" align="center"><font color="#ffffff">
            &nbsp;Related Examples
        </font></td>
</tr>
</table>


e7. <a class="eglink" href="WriteXml.html?l=rel">
    Serializing a Bean to XML
</a>
<br>

e8. <a class="eglink" href="ReadXml.html?l=rel">
    Deserializing a Bean from XML
</a>
<br>

e9. <a class="eglink" href="MakeTrans.html?l=rel">
    Preventing a Bean Property from Being Serialized to XML
</a>
<br>


<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td align="left">
<br>
        See also: 
<a class="eglink" href="/egs/java.beans/pkg.html?l=rel#Events">
    Events
</a>&nbsp;&nbsp;

</td>
</tr>
</table>

<br>

<br>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="0">
&copy; 2002 Addison-Wesley.
</FONT>
</BODY>
</HTML>

immute.html - 源码说明

本页面展示了「java类库详细讲解」中的 immute.html 源码文件，采用 HTML 编程语言编写，共 165 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

虫虫下载站收录了大量与java相关的技术资源，包括源代码、技术文档、电路图等，是电子工程师和嵌入式开发者的专业学习平台。

⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?