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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>构建自定义的组件 </b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 4 页（共6 页）</nobr></font></td>
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<p>组件类定义了 UI 组件的状态和行为。状态信息包括组件的类型、标识符和本地值。组件类定义的行为的一些例子包括解码（将请求参数和其他信息转换为组件的本地值）、编码（将本地值转换为某种标记）或者更新模型对象。 </p>
<p>我们通过扩展 <code>javax.faces.component.UIOutput</code> 类来创建电子邮件地址输出组件。 </p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
/*
 * $Id: UIOutputEmail.java,v 1.1 2003/06/20 16:48:49 jack Exp $
 * 
 */
package net.jackwind.jsf;

import java.io.IOException;
import java.util.StringTokenizer;

import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

/**
 * @author 	JACK	(Jun 19, 2003)
 * @class 	UIOutputEmail
 */
public class UIOutputEmail extends UIOutput {
	private String host;
	private String user;
	
	private void parseEmail(String email) {
		StringTokenizer st = new StringTokenizer(email, "@");
		if (st.countTokens() != 2)
			throw new IllegalArgumentException(
				"Invalid email address: " + email);
		user = st.nextToken();
		host = st.nextToken();
	}
	
	// This method indicates whether this component renders itself
	// or delegates rendering to a renderer.
	public boolean getRendersSelf() { 
	   return true; 
	}
	
	// Called during the Render Response phase
	public void encodeEnd(FacesContext context) throws IOException {
		if(user == null || host == null) {
			try {
				parseEmail((String)currentValue(context));
			}catch(Exception e) {
				LogUtil.log(e);
			}
		}
		ResponseWriter writer = context.getResponseWriter();
		
		// Represent this component as HTML with JavaScripts
		writer.write("&lt;script language='JavaScript'&gt;\n");
		writer.write("function emailAddress(host, user) { \n");
		writer.write("document.write('&lt;a href=\"mailto:');\n");
		writer.write("document.write(user + '@' + host);\n");
		writer.write("document.write('\"&gt;');\n");
		writer.write("document.write(user + '@' + host);\n");
		writer.write("document.write(\"&lt;/a&gt;\");\n}\n\n");
		writer.write("emailAddress('" + host + "', '" + 
		  user + "');\n");
		writer.write("&lt;/script&gt;\n");
	}

	protected String getComponentType() {
		return "output_email";
	}
}
</code>
</pre>
<p>注意我们改写了 <code>encodeEnd()</code> 方法来将该组件呈现为 HTML 标记。这个方法将在 JSF 生命周期的&ldquo;呈现响应&rdquo;阶段被调用。 </p>
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