08-struts2使用通配符配置action - Struts2快速入门教程

配置action的时候可以使用通配符。用星号*来表示任意的字符。

<struts>
    <constant name="struts.devMode" value="true"/>
    <package name="default" namespace="/"  extends="struts-default"> 
        <action name="*" class="cn.bamn.struts.HomeAction" method="{1}">  
            <result>
                /{1}.jsp
            </result>          
        </action>  
    </package> 
    <package name="admin" namespace="/admin"  extends="struts-default"> 
        <action name="*_*" class="cn.bamn.struts.{1}Action">  
            <result>
                /admin/{1}/{2}.jsp
            </result>
        </action>  
    </package>  
</struts>Code language: HTML, XML (xml)

每一个星号匹配到的内容。从左到右排序第一个就是用{1} 第二个用{2}

然后再后面的class method 以及result里面都可以使用。

然后我们修改两个action类

public class CategoryAction extends ActionSupport {
	
    public String index(){
        return SUCCESS;
    }
	
    public String add(){
        return SUCCESS;
    }
	
    public String del(){
        return SUCCESS;
    }
}

public class HomeAction extends ActionSupport {
	
    public String index(){
        return "success";
    }
}Code language: PHP (php)

然后把demo.jsp 改为index.jsp

但是当我们访问

http://p50:8080/Struct6Demo/admin/Category_add

报下面错误

Struts Problem Report
Struts has detected an unhandled exception: 
Messages:	1.	org/apache/jsp/admin/Category/add_jsp (wrong name: org/apache/jsp/admin/category/add_jsp) 
2.	java.lang.NoClassDefFoundError: org/apache/jsp/admin/Category/add_jsp (wrong name: org/apache/jsp/admin/category/add_jsp) 
File:	org/apache/jasper/servlet/JspServlet.java
Line number:	274
________________________________________
Stacktraces
javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/jsp/admin/Category/add_jsp (wrong name: org/apache/jsp/admin/category/add_jsp) 
    org.apache.jasper.servlet.JspServlet.service(JspServletCode language: PHP (php)

我们发现再result里面的jsp文件通配符只能用再文件名中不能用在目录结果里面因为中间隔了一个/

所以改为下面/admin/{1}_{2}.jsp

<package name="admin" namespace="/admin"  extends="struts-default"> 
    <action name="*_*" class="cn.bamn.struts.{1}Action" method="{2}">  
        <result>
            /admin/{1}_{2}.jsp
        </result>
    </action>  
</package>Code language: HTML, XML (xml)

当然如果需要jsp的目录路径也使用。我们需要给result标签页增加一个带通配符的name属性。

<package name="admin" namespace="/admin"  extends="struts-default"> 
    <action name="*_*" class="cn.bamn.struts.{1}Action" method="{2}">  
        <result name="{2}">
            /admin/{1}/{2}.jsp
        </result>
    </action>  
</package>Code language: HTML, XML (xml)

然后CategoryAction的各个action方法要调整。

public class CategoryAction extends ActionSupport {
	
    public String index(){
        return "index";
    }
	
    public String add(){
        return "add";
    }
	
    public String del(){
        return "del";
    }
}Code language: PHP (php)