jee6　学习笔记２ - ＠ＭａｎａｇｅｄＢｅａｎ - 加瓦的境界

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jee6　学习笔记２ - ＠ＭａｎａｇｅｄＢｅａｎ

博客分类：

ejb3.1 jsf2.1 @ManagedBean primefaces3.3

看看ＢａｃｋｉｎｇＢｅａｎ（ｏｒ　ＡｃｔｉｏｎＢｅａｎ　ｉｆ　ｙｏｕ　ｌｉｋｅ），先上图。

ｔｈｅ　ｌｏｇｉｎ　ｓｃｒｅｅｎ

ｌｏｇｉｎ　ｖａｌｉｄａｔｉｏｎ　１：　ｍｉｓｓｉｎｇ　ｒｅｑｕｉｒｅｄ　ｆｉｅｌｄｓ

ｌｏｇｉｎ　ｖａｌｉｄａｔｉｏｎ　２：　ｗｒｏｎｇ　ｐａｓｓｗｏｒｄ

ｈｏｍｅ　ｓｃｒｅｅｎ：　ａｆｔｅｒ　ｓｕｃｃｅｓｓｆｕｌ　ｌｏｇｉｎ

<!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:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:p="http://primefaces.org/ui"> 
    
<h:head>
</h:head>

<h:body>
    <p:panel header="Login Panel" style="width:50%">
     <h:messages/>
     <h:form>
      <h:panelGrid columns="2">
      <h:outputLabel value="username: "/> 
      <h:inputText id="nameId" value="#{loginBean.user.username}"/>
      <h:outputLabel value="password: "/> 
      <h:inputSecret id="passId" value="#{loginBean.user.password}"/>
      <!-- call action bean method login() -->
      <h:commandButton type="submit" value="Login" action="#{loginBean.login}"/>
      </h:panelGrid>
     </h:form>
    </p:panel>
</h:body>
</html>

Backing bean "LoginBean.java"

package com.jxee.action;

import java.io.Serializable;

import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;

import com.jxee.ejb.UserDAO;
import com.jxee.model.User;

/**
 * Backing bean for login.xhtml
 * @ManagedBean used to replace the declaration of the bean in faces-config.xml
 * <br/>you can give it a name, like @ManagedBean("myBean"), otherwise, it defaults
 * to the class name with the first character lower cased, eg, "loginBean". So in this
 * example, it can be accessed in JSF pages like this: #{loginBean.login}
 */
@ManagedBean
@SuppressWarnings("all")
public class LoginBean implements Serializable {
  
  private static final Logger log = Logger.getLogger(LoginBean.class);
  
  // inject EJB UserDAO for accessing database
  // it's recommended to use CDI annotations @javax.inject.Inject, instead of @EJB.
  // but in my current environment, it's just not working. Also not working is the
  // annotation @javax.inject.Named. don't why, probably CDI is not available in JBoss6.1?
  @EJB UserDAO userDao;
  
  private User user = new User();
  
  public User getUser() { return this.user; }
  public void setUser(User user) { this.user = user; }

  // called by "login.xhtml" to login user
  public String login() {
    
    log.debug("login user: " + user.getUsername());
    log.debug("userDao is null ? " + (userDao == null ? "true" : "false"));
    
    try {
      User registeredUser = this.userDao.findUserByName(user.getUsername());
      
      if(registeredUser != null) {
        if(registeredUser.getUsername().equals(user.getUsername())) {
          if(registeredUser.getPassword().equals(user.getPassword())) {
            log.debug("user logged in: " + registeredUser.getUsername());

　　　　　　　　　　// 直接定义，爽!!！no fking navigation rules!
            return "home";  // send user to "home.jsf"，　
          }
          else {
            FacesMessage errormsg = new FacesMessage("Hey! forget your password?");
            FacesContext.getCurrentInstance().addMessage(null, errormsg);
            return "login";
          }
        }
      }
    }
    catch(Exception e) {
      log.debug(e);
    }
      
    FacesMessage regmsg = new FacesMessage("Hey! please register...");
    FacesContext.getCurrentInstance().addMessage(null, regmsg);
    
    return "login"; // should redirect to "register.xhtml"
  }
  
  // called by "home.xhmtl" logout
  public String logout() {
    log.debug("invalidate session for user: " + user.getUsername());
    HttpSession session = (HttpSession)FacesContext.getCurrentInstance().getExternalContext().getSession(false);
    if(session != null) {
      String sessionId = session.getId();
      session.invalidate();
      log.debug("session invalidated: " + sessionId);
    }
    return "login"; // return to login page "log.xhtml"
  }
  
  // called by "home.xhtml" to render some data only
  public String getSessionId() {
    ExternalContext cntxt = FacesContext.getCurrentInstance().getExternalContext();
    HttpSession session = (HttpSession)cntxt.getSession(false);
    
    // it seems that JSF creates the session automatically, is it good or necessary?
    if(session == null) {
      log.debug("creating http session for user: " + user.getUsername());
      session = (HttpSession)cntxt.getSession(true);
    }
    
    log.debug(String.format("jsf2 created session already, id=%s, created time: %s", 
                            session.getId(), new java.util.Date(session.getCreationTime())));
    
    return session != null ? session.getId() : "no session found";
  }
}

package com.jxee.model;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

/**
 * entity bean to table "jwtest.appuser"
 * validation done here as well -- this is excellent!
 */
@Entity
@Table(name="APPUSER")
public class User implements Serializable {
  
  @Id
  @GeneratedValue
  @Column(name="userid")
  private Integer userid;
  
  @Column(name="username")
  @NotNull(message="username cannot be null")
  @Size(min=4,max=20,message="username must be 4-20 characters")
  private String username;
  
  @Column(name="password")
  @NotNull(message="password cannot be null")
  @Size(min=4,max=10, message="password must be 4-10 characters")
  private String password;
  
  @Column(name="email")
  @Pattern(regexp="^(.)+@(.)+$", message="email must match something@somedomain")
  private String email;
  
  
  public Integer getUserid() {
    return userid;
  }

  public void setUserid(Integer userid) {
    this.userid = userid;
  }
  
  public String getUsername() {
    return username;
  }
  
  public void setUsername(String username) {
    this.username = username;
  }
  
  public String getPassword() {
    return password;
  }
  
  public void setPassword(String password) {
    this.password = password;
  }
  
  public String getEmail() {
    return email;
  }
  
  public void setEmail(String email) {
    this.email = email;
  }
}

小姐以下：

１。　＠ＭａｎａｇｅｄＢｅａｎ替代了ｆａｃｅｓ－ｃｏｎｆｉｇ．ｘｍｌ，这是好事啊，ｘｍｌ配置文件是最讨厌了。从Ｊ２ＥＥ开始，一堆爱克斯爱慕爱澳（ｘｍｌ）文件，他们说这样灵活，你说有多操蛋！现在人们终于回过味来了。就像EJB２被（死脑筋（ｓｂｒａｉｎ－ｓｐｒｉｎｇ）

）打得晕头转向才搞了ＥＪＢ３是一样。

２。　jsf搞了一堆标签，这太讨厌了，看看开头的ｎａｍｅ　ｓｐａｃｅｓ就知道了。希望ｐｒｉｍｅｆａｃｅｓ能做好，以后就主流化了。ｒｉｃｈｆａｃｅｓ死气沉沉的，文档也是草蛋的。

３。　ＣＤＩ　＠ｊａｖａ．ｉｎｊｅｃｔ．Ｉｎｊｅｃｔ　ａｎｄ　＠ｊａｖａｘ．ｉｎｊｅｃｔ．Ｎａｍｅｄ　在这个例子里不行，不知道为什么。可能我的环境有问题，ＪＢｏｓｓ６．１不支持吗？还来还得看看ＣＤＩ，完全没概念。

４。　Ｖａｌｉｄａｔｉｏｎ放在ｅｎｔｉｔｙ上很爽，希望其“ｍｅｓｓａｇｅ＂属性能支持ＥＬ表达式，这样能国际化。

５。　Ｎａｖｉｇａｔｉｏｎ　ｒｕｌｅｓ　可以直接定义在Ｂａｃｋｉｎｇ　Ｂｅａｎ里面，这太好了！太爽了！

６。　Ｗｅｂ　ＭＶＣ框架最主要的任务，其实就是自动绑定ＡｃｔｉｏｎＢｅａｎ／Ｂａｃｋｉｎｇ　Ｂｅａｎ，并提供较好的Ｆｏｒｍ　Ｖａｌｉｄａｔｉｏｎ支持。通过这个例子，目前可以说明ＪＳＦ２／ＥＪＢ３．１／ＪＰＡ的搭配已经很简洁了。如果能很好地运用Ｐｒｉｍｅｆａｃｅｓ，相信利用ＪＥＥ６来开发，根本不需要什么第三方的框架，而完全是标准技术。

没架子多好！不但容易提高，工作轻松了，而且好找工作了。你想到木有？！

下一片看看ＥＪＢ／ＪＰＡ：　jee6 学习笔记 3 - an ejb3.1 DAO