JSF 简单的JSF实现依赖注入的例子

来源：互联网发布：手机网络不好怎么回事编辑：程序博客网时间：2024/05/04 05:42

首先,写一个IUserService的接口,接口中只有属性方法: getUsername, getPassword, setUsername, setPassword四个方法.代码如下:

package net.moon.service;
public interface IUserService ...{
String getUsername();
String getPassword();
void setUsername(String username);
void setPassword(String password);
}

用一个类实现该接口,代码如下:

package net.moon.model;
import net.moon.service.IUserService;
public class UserInfo implements IUserService...{
private String username;
private String password;

/** *//**
* @return the usernmae
*/
public String getUsername() ...{
return username;
}

/** *//**
* @param usernmae the usernmae to set
*/
public void setUsername(String usernmae) ...{
this.username = usernmae;
}

/** *//**
* @return the password
*/
public String getPassword() ...{
return password;
}

/** *//**
* @param password the password to set
*/

public void setPassword(String password) ...{
this.password = password;
}
}

写一个事务类,实现login功能,其中有一个类型为IUserService的域,代码如下:

package net.moon.business;

import net.moon.service.IUserService;

public class UserBO ...{

IUserService user;

public String login()...{
String result = "FAILED";
//System.out.println(result);
if(user.getUsername().equalsIgnoreCase("admin")
&& user.getPassword().equals("password"))...{
result = "PASS";
}
return result;
}

/** *//**
* @return the user
*/

public IUserService getUser() ...{
return user;
}

/** *//**
* @param user the user to set
*/
public void setUser(IUserService user) ...{
this.user = user;
}
}

注意该类中的属性方法setUser, 其中的参数user作为IUserService的接口类型.然后就是用什么方法对user进行注入,这时候就要想到JSF中的Managed Properties.

首先在,faces-config中配置UserInfo类为MBean,代码如下:

<managed-bean>
<managed-bean-name>userInfo</managed-bean-name>
<managed-bean-class>net.moon.model.UserInfo</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>

然后将事务类UserBO也配置为MBean,代码如下:

<managed-bean>
<managed-bean-name>userBO</managed-bean-name>
<managed-bean-class>
net.moon.business.UserBO
</managed-bean-class>

<managed-bean-scope>request</managed-bean-scope>
<managed-property>
   <property-name>user</property-name>
   <property-class>
    net.moon.service.IUserService
   </property-class>
   <value>#{userInfo}</value>
</managed-property>
</managed-bean>

为userBO这个MBean配置了一个Managed Property,也就是要求JSF在实现userBO时, 用userInfo这个MBean为其user这个域赋值,从而实现注入.

接下来就是页面的实现了,首先是login页面, 代码如下:

<%...@ page contentType="text/html; charset=UTF-8" %>
<%...@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%...@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>

   <h:outputText value="Password:"></h:outputText>
   <h:inputText value="#{userInfo.password}"></h:inputText>
   </h:panelGrid>
   <h:commandButton value="Login" action="#{userBO.login}"></h:commandButton>
</h:form>
</f:view>
</body>
</html>

表示登录成功的页面welcome.jsp,代码如下:

<%...@ page contentType="text/html; charset=UTF-8" %>
<%...@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%...@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>

配置导航如下:

<navigation-rule>
<display-name>login</display-name>
<from-view-id>/login.jsp</from-view-id>
<navigation-case>
   <from-action>#{userBO.login}</from-action>
   <from-outcome>PASS</from-outcome>
   <to-view-id>/welcome.jsp</to-view-id>
</navigation-case>
<navigation-case>
            <from-action>#{userBO.login}</from-action>
            <from-outcome>FAILED</from-outcome>
            <to-view-id>/login.jsp</to-view-id>
        </navigation-case>
</navigation-rule>