我试图执行一个＆＃34; helloWorld＆＃34;学习CDI的项目类型，我有点迷失，我不理解我注意到的行为。
首先，在阅读了参考文档后，我试图从WELD发行版中执行这些示例：http://docs.jboss.org/weld/reference/latest/en-US/html/，第6章
嗯，我不知道为什么，但无论我怎么做，它们都不适合我。所以，我决定＆＃34;重写＆＃34;第一个练习，如果我现在可以看到正在运行的应用程序（JBoss EAP），我现在不明白现在的情况：
我的项目：
计算随机数的生成器（ApplicationScoped）：
@ApplicationScoped
public class Generator implements Serializable{
private static final int MAX_NUMBER = 100;
private java.util.Random random = new java.util.Random(System.currentTimeMillis());
/**
* Serializable
*/
private static final long serialVersionUID = 7388013951586598074L;
@Produces
public @MaxNumber int getMaxNumber(){
return MAX_NUMBER;
}
java.util.Random getRandom() {
return random;
}
@Produces
@Random
int next() {
//a number between 1 and 100
return getRandom().nextInt(MAX_NUMBER - 1) + 1;
}
}
游戏bean，SessionScoped
@SessionScoped
@Named
public class Game implements Serializable{
/**
* Serializable
*/
private static final long serialVersionUID = 8480529461297926872L;
/**
* The real number
*/
private int number;
/**
* The guessed number
*/
private int guess;
/**
* The limit min/max of number could be (updated for each try)
*/
private int biggest;
private int smallest;
/**
* Remaining guesses
*/
private int remainingGuesses;
@Inject
private @MaxNumber int maxNumber;
@Inject
private @Random Instance<Integer> randomNumber;
public void check(){
if (guess > number) {
biggest = guess - 1;
} else if (guess < number) {
smallest = guess + 1;
} else if (guess == number) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Correct!"));
}
remainingGuesses--;
}
@PostConstruct
public void reset(){
this.smallest = 0;
this.guess = 0;
this.remainingGuesses = 10;
this.biggest = maxNumber;
this.number = randomNumber.get();
}
public void validateNumberRange(FacesContext context, UIComponent toValidate, Object value) {
if (remainingGuesses <= 0) {
FacesMessage message = new FacesMessage("No guesses left!");
context.addMessage(toValidate.getClientId(context), message);
((UIInput) toValidate).setValid(false);
return;
}
int input = (Integer) value;
if (input < smallest || input > biggest) {
((UIInput) toValidate).setValid(false);
FacesMessage message = new FacesMessage("Invalid guess");
context.addMessage(toValidate.getClientId(context), message);
}
}
public int getNumber() {
return number;
}
public int getBiggest() {
return biggest;
}
public int getSmallest() {
return smallest;
}
public int getRemainingGuesses() {
return remainingGuesses;
}
public void setRemainingGuesses(int remainingGuesses) {
this.remainingGuesses = remainingGuesses;
}
public int getGuess() {
return guess;
}
public void setGuess(int guess) {
this.guess = guess;
}
}
我的两个注释（我把MaxNumber，Random和随机名称相同）：
@Qualifier
@Retention(RetentionPolicy.RUNTIME)
@Target({TYPE,METHOD,FIELD, PARAMETER})
public @interface MaxNumber {
}
我的WEB-INF文件夹中有beans.xml，faces-config和web.xml（前两个文件中只有DOCTYPE，...）
和web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<display-name>Try and guess</display-name>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>faces/index.xhtml</welcome-file>
</welcome-file-list>
</web-app>
最后，我的index.xhtml：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html">
<ui:composition template="/template.xhtml">
<ui:define name="content">
<h1>Guess a number...</h1>
<h:form id="numberGuess">
<div style="color: red">
<h:messages id="messages" globalOnly="false" />
<h:outputText id="Higher" value="Higher!"
rendered="#{game.number gt game.guess and game.guess ne 0}" />
<h:outputText id="Lower" value="Lower!"
rendered="#{game.number lt game.guess and game.guess ne 0}" />
</div>
<div>
I'm thinking of a number between <span id="numberGuess:smallest">#{game.smallest}</span>
and <span id="numberGuess:biggest">#{game.biggest}</span>. You have
#{game.remainingGuesses} guesses remaining.
</div>
<div>
Your guess:
<h:inputText id="inputGuess" value="#{game.guess}" required="true"
size="3" disabled="#{game.number eq game.guess}"
validator="#{game.validateNumberRange}" />
<h:commandButton id="guessButton" value="Guess"
action="#{game.check}" disabled="#{game.number eq game.guess}" />
</div>
<div>
<h:commandButton id="restartButton" value="Reset"
action="#{game.reset}" immediate="true" />
</div>
</h:form>
</ui:define>
</ui:composition>
</html>
嗯，现在，发生了什么：
当我尝试访问我的页面时，在显示index.xhtml之前，会多次调用reset方法（标有PostConstruct）。显示的值是预期的值（因为它是我们第一次访问页面时） 我尝试输入一个数字并单击猜测按钮，方法重置被调用几次（我不知道为什么），并且我的方法检查（预期的一次），一次，来完成它的工作。但是再次调用reset方法，显示的页面与开始时的状态相同。 所以问题是： - 为什么在开始时多次调用reset方法？ - 为什么要调用reset方法呢？
谢谢你 Cheloute
答案 0 :(得分：0)
那么， 我认为javax.enterprise.context.SessionScoped和javax.faces.bean.SessionScoped是等价的，但我错了：）
我认为我的Game bean实际上是一个Dependent范围，因为javax.faces.bean.SessionScoped并不像预期的SessionScoped那样处理......