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JSF实例学习--JSF Weekly 电子报订阅
摘要: JSF实例学习--JSF Weekly 电子报订阅
JSF Weekly 电子报订阅。这是网上来的一个JSF入门实例，原来它是jsf1.0版本的，我将其改为了jsf1.1版。
这个例子主要有三个特点：
一、中英文界面且资源包使用类，如中文资源包：
/*
* $Id: Resources_zh.java,v 1.2 2003/06/17 01:14:03 jack Exp $
*
*/
package net.jackwind.jsf;
// Chinese lang. resource bundle.
public class Resources_zh extends java.util.ListResourceBundle {
static final Object[][] contents = new String[][] {
{ "locale", "请选择您的语言" },
{ "title", "JSF 演示： 电子报订阅系统 " },
{ "prompt", "您正在订阅" },
{ "newsletter", "电子报" },
{ "email", "电子信箱" },
{ "password", "密码" },
{ "confirmPassword", "确认密码" },
{ "format", "电子邮件格式" },
{ "donotuse", "请不要寄给我更多广告信息" },
{ "submit", "订阅" },
{ "url-welcome", "首页" },
{ "url-subscribe", "订阅" },
{ "passwords-not-match", "密码与重覆密码不相配。 " },
{ "go-back", "退回" },
{ "thank-you", "您的订阅申请已被提交，感谢支持。" },
{ "details", "订阅详细信息" }
};
public Object[][] getContents() {
return contents;
}
}
二、定义了一个组件，它将用户提交的邮件地址输出时添加了一个email链接，这仅仅为了学习自定义组件。如下如示：<table width="655" height="47" border="0"> <tr> <td width="381">
/*
* $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, "@");
i f (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;
}
/**
* Decode the current state of this UIComponent from the request contained in
* the specified FacesContext, and attempt to convert this state information
* into an object of the required type for this component.
*/
// public void decode(FacesContext context) throws IOException {
// // Not needed.
// }
// Called during the Render Response phase
public void encodeEnd(FacesContext context) throws IOException {
if(user == null || host == null) {
try {
String clientId = getClientId(context);
parseEmail((String)getValue());
}catch(Exception e) {
//System.out.println(e);
}
}
ResponseWriter writer = context.getResponseWriter();
// Represent this component as HTML
writer.write("<script language='JavaScript'>\n");
writer.write("function emailAddress(host, user) { \n");
writer.write("document.write('
writer.write("document.write(user + '@' + host);\n");
writer.write("document.write('\">');\n");
writer.write("document.write(user + '@' + host);\n");
writer.write("document.write(\"\");\n}\n\n");
writer.write("emailAddress('" + host + "', '" + user + "');\n");
writer.write("</script>\n");
}
}
自定义组件的标记类：
/*
* $Id: UIOutputEmailTag.java,v 1.1 2003/06/20 16:48:49 jack Exp $
*
*/
package net.jackwind.jsf;
import javax.faces.component.UIComponent;
import javax.faces.webapp.UIComponentTag;
import javax.faces.context.FacesContext;
import javax.faces.application.Application;
import javax.faces.el.ValueBinding;
/**
* @author JACK(Jun 19, 2003)
* @class UIOutputEmail
*/
public class UIOutputEmailTag extends UIComponentTag {
private String valueRef;
private String value;
public String getComponentType() {
return "UIOutputEmail";
}
public void setValue(String value) {
this.value = value;
}
public String getValue() {
return value;
}
public String getValueRef() {
return valueRef;
}
public void setValueRef(String newValueRef) {
valueRef = newValueRef;
}
/**
* Return the rendererType property that selects the Renderer to be used
* for encoding this component, or null to ask the component to render
* itself directly. Subclasses must override this method to return the
* appropriate value.
*/
public String getRendererType() {
return null;
}
public void setProperties(UIComponent component) {
super.setProperties(component);
setStringProperty(component, "value", value);
setStringProperty(component, "valueRef", valueRef);
}
private void setStringProperty(UIComponent component, String attrName, String attrValue) {
if(attrValue == null)
return;
if(isValueReference(attrValue)) {
FacesContext context =FacesContext.getCurrentInstance();
Application application =context.getApplication();
ValueBinding binding =application.createValueBinding(attrValue);
component.setValueBinding(attrName, binding);
}
else {
component.getAttributes().put(attrName, attrValue);
}
}
public void release() {
super.release();
value = null;
valueRef = null;
}
}
三、自定义了邮件地址的验证器：
/*
* $Id: EmailAddressValidator.java,v 1.2 2003/06/20 16:48:49 jack Exp $
*
*/
package net.jackwind.jsf;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.validator.*;
/**
* @author JACK (Jun 16, 2003)
* @class EmailValidator
*/
public class EmailAddressValidator implements Validator {
/**
* The message identifier of the Message to be created if
* the validation fails.
*/
public static final String EMAIL_ADDRESS_INVALID ="net.jackwind.jsf.EMAIL_ADDRESS_INVALID";
// Email address pattern. Used by regex.
public static String PATTERN_EMAIL ="[a-zA-Z0-9][\\w\\.\\-]*@[a-zA-Z0-9][\\w\\.\\-]*\\.[a-zA-Z][a-zA-Z\\.]*";
private Pattern pattern = Pattern.compile(PATTERN_EMAIL);
public void validate(FacesContext context, UIComponent component,Object ob) {
if ((context == null) || (component == null)) {
throw new NullPointerException();
}
if (!(component instanceof UIOutput)) {
return;
}
Object componentValue = ((UIOutput) component).getValue();
String value = (componentValue == null ? null : componentValue.toString());
if(value == null)
return;
if (!validateEmailAddress(value)) {
FacesMessage message = new FacesMessage( FacesMessage.SEVERITY_ERROR, "邮件地址错误", "邮件地址错误");
throw new ValidatorException(message);
}
}
private boolean validateEmailAddress(String emailAddress) {
if(emailAddress == null) return false;
Matcher matcher = pattern.matcher(emailAddress);
return matcher.matches();
}
}
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