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Posted on 2007-06-06 17:27 Linden.zhang 閱讀(680) 評論(0) 編輯 收藏 所屬分類: Jsf
從下載的jsf-1_1_01中看到了四個例子，(下載地址： http://java.sun.com/j2ee/javaserverfaces/download.html)，自己jsf剛剛起步，應該認真研究。 首先下載jsf-1_1_01.zip，并解壓。在解壓的目錄中找到samples目錄，把其中的jsf-cardemo.war放到Tomcat 5的webapps目錄中，啟動Tomcat 5,在瀏覽器中輸入：http://127.0.0.1:8080/jsf-guessNumber/。  例子是簡單了點！ greeting.jsp
| 程序代碼： |
<%@ page contentType="text/html;charset=GBK"%>
<HTML>
<HEAD> <title>Hello</title> </HEAD>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<body bgcolor="white">
<f:view>
<h:form id="helloForm" >
<h2>我的名字叫Duke. 我想好了一個數(shù)字，范圍是
<h:outputText value="#{UserNumberBean.minimum}"/> 到
<h:outputText value="#{UserNumberBean.maximum}"/>. 你能猜出它？
</h2>
<h:graphicImage id="waveImg" url="/wave.med.gif" />
<h:inputText id="userNo" value="#{UserNumberBean.userNumber}" validator="#{UserNumberBean.validate}"/>
<h:commandButton id="submit" action="success" value="Submit" />
<p>
<h:message style="color: red; font-family: 'new Century Schoolbook', serif; font-style: oblique; text-decoration: overline" id="errors1" for="userNo"/>
</h:form>
</f:view>
</body>
</HTML> |
數(shù)字的最大值、最小值、猜對與否、及數(shù)字的驗證都綁到了UserNumberBean上，沒有使用標準驗證器。且來看看這個應用中的主角：
| 程序代碼： |
package guessNumber;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.LongRangeValidator;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import java.util.Random;
public class UserNumberBean {
Integer userNumber = null;
Integer randomint = null;
String response = null;
protected String[] status = null;
private int minimum = 0;
private boolean minimumSet = false;
private int maximum = 0;
private boolean maximumSet = false;
public UserNumberBean() {
Random randomGR = new Random();
randomint = new Integer(randomGR.nextInt(10));
System.out.println("Duke's number: " + randomInt);
}
public void setUserNumber(Integer user_number) {
userNumber = user_number;
System.out.println("Set userNumber " + userNumber);
}
public Integer getUserNumber() {
System.out.println("get userNumber " + userNumber);
return userNumber;
}
public String getResponse() {
if (userNumber != null && userNumber.compareTo(randomInt) == 0) {
return "Yay! You got it!";
} else {
return "Sorry, " + userNumber + " is incorrect.";
}
}
public String[] getStatus() {
return status;
}
public void setStatus(String[] newStatus) {
status = newStatus;
}
public int getMaximum() {
return (this.maximum);
}
public void setMaximum(int maximum) {
this.maximum = maximum;
this.maximumSet = true;
}
public int getMinimum() {
return (this.minimum);
}
public void setMinimum(int minimum) {
this.minimum = minimum;
this.minimumSet = true;
}
public void validate(FacesContext context,
UIComponent component,
Object value) throws ValidatorException {
if ((context == null) || (component == null)) {
throw new nullPointerException();
}
if (value != null) {
try {
int converted = intValue(value);
if (maximumSet &&
(converted > maximum)) {
if (minimumSet) {
throw new ValidatorException(
MessageFactory.getMessage
(context,
Validator.NOT_IN_RANGE_MESSAGE_ID,
new Object[]{
new Integer(minimum),
new Integer(maximum)
}));
} else {
throw new ValidatorException(
MessageFactory.getMessage
(context,
LongRangeValidator.MAXIMUM_MESSAGE_ID,
new Object[]{
new Integer(maximum)
}));
}
}
if (minimumSet &&
(converted < minimum)) {
if (maximumSet) {
throw new ValidatorException(MessageFactory.getMessage
(context,
Validator.NOT_IN_RANGE_MESSAGE_ID,
new Object[]{
new Double(minimum),
new Double(maximum)
}));
} else {
throw new ValidatorException(
MessageFactory.getMessage
(context,
LongRangeValidator.MINIMUM_MESSAGE_ID,
new Object[]{
new Integer(minimum)
}));
}
}
} catch (NumberFormatException e) {
throw new ValidatorException(
MessageFactory.getMessage
(context, LongRangeValidator.TYPE_MESSAGE_ID));
}
}
}
private int intValue(Object attributeValue)
throws NumberFormatException {
if (attributeValue instanceof Number) {
return (((Number) attributeValue).intValue());
} else {
return (Integer.parseInt(attributeValue.toString()));
}
}
} |
數(shù)字的最小值，最大值在faces-config.xml中設置。這里主要看看那個validate方法，它在數(shù)字不在0-10范圍時，拋出ValidatorException異常。異常信息將會由標記<h:message for="userNo">輸出。這些異常信息如何本地化定制？那就是從資源包中獲取！請看：
| 程序代碼： |
package guessNumber;
import javax.faces.application.Application;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import java.text.MessageFormat;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
public class MessageFactory extends Object {
private MessageFactory() {
}
//這個方法是用做參數(shù)替換
public static String substituteParams(Locale locale, String msgtext, Object params[]) {
String localizedStr = null;
if (params == null || msgtext == null) {
return msgtext;
}
StringBuffer b = new StringBuffer(100);
MessageFormat mf = new MessageFormat(msgtext);
if (locale != null) {
mf.setLocale(locale);
b.append(mf.format(params));
localizedStr = b.toString();
}
return localizedStr;
}
//上面方法的用法例子
public static void main(String args[]){ String msgtext="我由于{0},不能去{1}"; String params[]={"有事","北京"}; String s=substituteParams(Locale.CHINESE,msgtext,params); System.out.println(s); }
/**
運行結果： D:\java>java Test 我由于有事,不能去北京
D:\java>
*/
/**
* This version of getMessage() is used in the RI for localizing RI
* specific messages.
*/
public static FacesMessage getMessage(String messageId, Object params[]) {
Locale locale = null;
FacesContext context = FacesContext.getCurrentInstance();
// context.getViewRoot() may not have been initialized at this point.
if (context != null && context.getViewRoot() != null) {
locale = context.getViewRoot().getLocale();
if (locale == null) {
locale = Locale.getDefault();
}
} else {
locale = Locale.getDefault();
}
return getMessage(locale, messageId, params);
}
//從資源包中獲取信息，從而構造jsf頁面標記<h:message>與<h:messages>中所要顯示的詳細和摘要信息
public static FacesMessage getMessage(Locale locale, String messageId,
Object params[]) {
FacesMessage result = null;
String
summary = null,
detail = null,
bundleName = null;
ResourceBundle bundle = null;
// see if we have a user-provided bundle
if (null != (bundleName = getApplication().getMessageBundle())) {//資源包的名字
if (null !=
(bundle =
ResourceBundle.getBundle(bundleName, locale,
getCurrentLoader(bundleName)))) {//獲取資源包
// see if we have a hit
try {
summary = bundle.getString(messageId);//從資源包中獲取信息摘要
} catch (MissingResourceException e) {
}
}
}
// 如果不能在用戶提供的資源包中獲取信息摘要，再從默認的資源包中查找
if (null == summary) {
// see if we have a summary in the app provided bundle
bundle = ResourceBundle.getBundle(FacesMessage.FACES_MESSAGES,
locale,
getCurrentLoader(bundleName));
if (null == bundle) {
throw new nullPointerException(" bundle " + bundle);
}
// see if we have a hit
try {
summary = bundle.getString(messageId);
} catch (MissingResourceException e) {
}
}
// we couldn't find a summary anywhere! return null
if (null == summary) {
return null;
}
// At this point, we have a summary and a bundle.
if (null == summary || null == bundle) {
throw new nullPointerException(" summary " + summary + " bundle " +
bundle);
}
//參數(shù)替換，用參數(shù)params替換摘要中的{0},{1}等占位符。
summary = substituteParams(locale, summary, params);
try {
//詳細信息
detail = substituteParams(locale,
bundle.getString(messageId + "_detail"),
params);
} catch (MissingResourceException e) {
}
return (new FacesMessage(summary, detail));
}
//
// Methods from MessageFactory
//
public static FacesMessage getMessage(FacesContext context, String messageId) {
return getMessage(context, messageId, null);
}
public static FacesMessage getMessage(FacesContext context, String messageId,
Object params[]) {
if (context == null || messageId == null) {
throw new nullPointerException(" context " + context + " messageId " +
messageId);
}
Locale locale = null;
// viewRoot may not have been initialized at this point.
if (context != null && context.getViewRoot() != null) {
locale = context.getViewRoot().getLocale();
} else {
locale = Locale.getDefault();
}
if (null == locale) {
throw new nullPointerException(" locale " + locale);
}
FacesMessage message = getMessage(locale, messageId, params);
if (message != null) {
return message;
}
locale = Locale.getDefault();
return (getMessage(locale, messageId, params));
}
public static FacesMessage getMessage(FacesContext context, String messageId,
Object param0) {
return getMessage(context, messageId, new Object[]{param0});
}
public static FacesMessage getMessage(FacesContext context, String messageId,
Object param0, Object param1) {
return getMessage(context, messageId, new Object[]{param0, param1});
}
public static FacesMessage getMessage(FacesContext context, String messageId,
Object param0, Object param1,
Object param2) {
return getMessage(context, messageId,
new Object[]{param0, param1, param2});
}
public static FacesMessage getMessage(FacesContext context, String messageId,
Object param0, Object param1,
Object param2, Object param3) {
return getMessage(context, messageId,
new Object[]{param0, param1, param2, param3});
}
protected static Application getApplication() {
return (FacesContext.getCurrentInstance().getApplication());
}
//獲取當前的類加載器，需要該類加載器來查找資源包
protected static ClassLoader getCurrentLoader(Object fallbackClass) {
ClassLoader loader =
Thread.currentThread().getContextClassLoader();
if (loader == null) {
loader = fallbackClass.getClass().getClassLoader();
}
return loader;
}
} // end of class MessageFactory |
當然我們需要在faces-config.xml中定義資源包名
| 程序代碼： |
<application>
<locale-config>
<default-locale>zh_CN</default-locale>
<supported-locale>en</supported-locale>
<supported-locale>fr</supported-locale>
<supported-locale>es</supported-locale>
</locale-config>
<message-bundle>guessNumber.messages</message-bundle>
</application> |
并寫出messages_zh_CN.properties文件: javax.faces.validator.NOT_IN_RANGE=驗證錯誤: 數(shù)字應該在{0}和{1}之間 javax.faces.validator.LongRangeValidator.MAXIMUM=驗證錯誤: 數(shù)字不應該比{0}大 javax.faces.validator.LongRangeValidator.MINIMUM=驗證錯誤:數(shù)字不應該比{0}小 javax.faces.validator.LongRangeValidator.TYPE=驗證錯誤:數(shù)字類型錯誤. javax.faces.component.UIInput.CONVERSION=轉換數(shù)字時發(fā)生錯誤. javax.faces.component.UIInput.REQUIRED=請輸入數(shù)字 ...
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