Struts框架（三）

 

Struts标签库的使用

           1） 常用的struts tag lib

        <bean:write>

        <logic:empty>和<logic:notEmpty>

        <logic:present>和<logic:notPresent>

        <logic:iterator>

          举例：

<body>
<h1>测试迭代标签</h1>
<hr>
<table border="1">
<tr>
<td>姓名</td>
<td>年龄</td>
<td>所属组</td>
</tr>
<logic:empty name="user_list">
<tr>
<td colspan="3">没有符合条件的数据</td>
</tr>
</logic:empty>
<logic:notEmpty name="user_list">
<logic:iterate id="user" name="user_list">
<tr>
<td>
<bean:write name="user" property="username"/>
</td>
<td>
<bean:write name="user" property="age"/>
</td>
<td>
<bean:write name="user" property="group.name"/>
</td>
</tr>
</logic:iterate>
</logic:notEmpty>
</table>
</body>


 

        2）配置国际化支持，在struts-config.xml文件中加入如下配置：

             <message-resources parameter="MessageResources" />

             最好提供国际化资源文件（MessageResources.properties），将该文件放到src下

             消息文本的国际化处理，共有三个步骤： 
                    创建国际化消息
                    传递国际化消息 
                    显示国际化消息 
             实例：

public class LoginAction extends Action {   
    
    public ActionForward execute(ActionMapping mapping, ActionForm form,   
            HttpServletRequest request, HttpServletResponse response)   
            throws Exception {   
        LoginActionForm laf = (LoginActionForm)form;   
        String username = laf.getUsername();   
        String password = laf.getPassword();   
  
        ActionMessages messages = new ActionMessages();   
        try {   
            UserManager.getInstance().login(username, password);   
               
            //创建国际化消息文本   
            ActionMessage message = new ActionMessage("user.login.success", username);   
            //ActionMessage message = new ActionMessage("user.login.success", new Object[]{username});   
            messages.add("loginSuccess1", message);   
  
            ActionMessage message1 = new ActionMessage("user.login.success", username);   
            messages.add("loginSuccess2", message1);   
               
            //传递国际化消息文本   
            this.saveMessages(request, messages);   
            return mapping.findForward("success");   
        }catch(UserNotFoundException unfe) {   
            unfe.printStackTrace();   
               
            //创建国际化消息文本   
            ActionMessage message = new ActionMessage("user.not.found", username);   
            messages.add("error1", message);   
               
            //传递国际化消息文本   
            this.saveErrors(request, messages);   
        }catch(PasswordErrorException pee) {   
            pee.printStackTrace();   
            //创建国际化消息文本   
            ActionMessage message = new ActionMessage("user.password.error");   
            messages.add("error2", message);   
               
            //传递国际化消息文本   
            this.saveErrors(request, messages);   
        }   
        return mapping.findForward("error");   
    }   
  
}   
          // 设置Locale
public class ChangeLanguageAction extends Action {   
  
    @Override  
    public ActionForward execute(ActionMapping mapping, ActionForm form,   
            HttpServletRequest request, HttpServletResponse response)   
            throws Exception {   
        String lang = request.getParameter("lang");   
           
        Locale currentLocale = Locale.getDefault(); //默认情况下取得本机的语言   
        if ("zh".equals(lang)) {   
            currentLocale = new Locale("zh", "CN");   
        }else if("en".equals(lang)) {   
            currentLocale = new Locale("en", "US");   
        }   
        //request.getSession().setAttribute(Globals.LOCALE_KEY, currentLocale);   
           
        this.setLocale(request, currentLocale);   
        return mapping.findForward("index");   
    }     
}

 

        国际化资源文件 MessageResources.properties  

# -- standard errors -- 
errors.header=<UL> 
errors.prefix=<LI><font color="red"> 
errors.suffix=</font></LI> 
errors.footer=</UL> 


user.title=User Login 
user.username=User Name 
user.password=Password 
user.button.login=Login 

user.login.success={0},Login Success 
user.not.found=User Not Found,UserName[{0}] 
user.password.error=Password Error 
user.login.error=Login Error


MessageResources_en_US.properties   英文

errors.header=<UL> 
errors.prefix=<LI><font color="red"> 
errors.suffix=</font></LI> 
errors.footer=</UL> 

user.title=User Login 
user.username=User Name 
user.password=Password 
user.button.login=Login 

user.login.success={0},Login Success 
user.not.found=User Not Found,UserName[{0}] 
user.password.error=Password Error 
user.login.error=Login Error


MessageResources_zh_CN.properties  中文

# -- standard errors -- 
errors.header=<UL> 
errors.prefix=<LI><font color="red"> 
errors.suffix=</font></LI> 
errors.footer=</UL> 

user.title=\u7528\u6237\u767b\u5f55 
user.username=\u7528\u6237 
user.password=\u5bc6\u7801 
user.button.login=\u767b\u5f55 

user.login.success={0},\u767b\u5f55\u6210\u529f 
user.not.found=\u7528\u6237\u4e0d\u80fd\u627e\u5230\uff0c\u7528\u6237\u540d\u79f0=[{0}] 
user.password.error=\u5bc6\u7801\u9519\u8bef 
user.login.error=\u767b\u5f55\u5931\u8d25


struts-config.xml 配置文件

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

<struts-config>

	<form-beans>
		<form-bean name="loginForm" type="com.bjsxt.struts.LoginActionForm"/>
	</form-beans>
	
	<action-mappings>
		<action path="/login"
				type="com.bjsxt.struts.LoginAction"
				name="loginForm"
				scope="request"
				validate="false"
		>
			<forward name="success" path="/login_success.jsp"/>
			<forward name="error" path="/login.jsp"/>
		</action>
		
		<action path="/changelang"
				type="com.bjsxt.struts.ChangeLanguageAction"   //转换语言
		>
			<forward name="index" path="/index.jsp"/>
		</action>
	</action-mappings>
	
	<message-resources parameter="res.MessageResources" />   //配置国际化资源文件必须要添加
</struts-config>



posted @ 2012-03-19 18:42  转航  阅读(211)  评论(0)    收藏  举报