struts2 codebehind + actionPackages 实现Action零配置

1。jar包：struts2-codebehind-plugin-2.2.1.1.jar

2。struts.xml：<!-- codebehind中查找action的返回结果资源时的默认文件夹 -->
    　　　　　　 <constant name="struts.codebehind.pathPrefix" value="/pages/" />

3。web.xml：

     <!-- struts2过滤器 -->
     <filter>
         <filter-name>struts2</filter-name>
         <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
         <init-param>
             <param-name>actionPackages</param-name>
             <param-value>
                 com.ext.emp.struts2,com.demo.stu.struts2
             </param-value>
         </init-param>
     </filter>
     <!-- action过滤 -->
     <filter-mapping>
         <filter-name>struts2</filter-name>
         <url-pattern>*.action</url-pattern>
     </filter-mapping>
     <!-- 静态资源过滤 -->
     <filter-mapping>
         <filter-name>struts2</filter-name>
         <url-pattern>/struts/*</url-pattern>
     </filter-mapping>

web.xml部分

4。

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　　1)Demo!doUpdate.action

　　2)Demo!update.action?empNo=<s:property value="empNo"/>

　　3)Demo!delete.action?empNo=<s:property value="empNo"/>

　　4)localhost:8080/empDemo/emp/Demo!create.action

5。

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这里action的命名最好加上Action后缀，否则可能与pojo中的Demo同名（不会影响去找"Demo"这个Action：DemoAction）

package com.ext.emp.struts2.emp;

public class DemoAction {

    // search show
    public String execute(){
        // get list
        if (pagiParam == null) {
            pagiParam = new PagiParam();
        }

        try {
            emps = empService.findToPage(empName, sortCol,
                    PureUtils.isAsc(sortOrder), pagiParam, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "success";
    }

    public String update(){
        emp = empService.findById(empNo);
        return "update";
    }

    public String doUpdate(){
        empService.update(emp);
        return execute();
    }

    public String create(){  //go to create page

        return "create";
    }

    public String doCreate(){

        empService.save(emp);
        return execute();
    }

    public String delete(){
        Emp emp = new Emp();
        emp.setEmpNo(empNo);
        empService.delete(emp);
        return execute();
    }
}

action主要代码

注意：

web.xml中actionPackages下com.bonc.ext.emp.struts2不能写成com.bonc.ext.emp.struts2.emp；

struts.xml限定了jsp的目录是在WebRoot/pages/下；

web.xml限定了action目录是在struts2/下；

对应一个请求localhost:8080/empDemo/emp/Demo!create.action，

会解析并判断是否有emp/DemoAction这个action，然后跳到create方法，这个方法返回“create”字符串，

然后解析并判断（Demo+‘-’+create+'jsp'，及Demo-create.jsp）是否有emp/Demo-create.jsp在/pages/下，有的话即把这个页面返回给浏览器