初学structs2，结果类型简单示例

一、自定义结果处理类，structs.xml中package节点下加result-types节点，在result-types节点下配置result-type的属性。然后在配置的action中的result属性type为resul-type的name属性值

如，自定义服务端重定向Dispatcher类

structs.xml配置：

<structs>
<package name="resulttype" namespace="/resulttype" extends="structs-default">
<result-types>
<result-type name="MyDispathcer" class="cn.hjp.resulttypes.MyDispatcher"></result-type>
</result-types>
<action name="HelloAction" class="cn.hjp.action.HelloAction">
<result name="Success" type="MyDispathcer">/Index.jsp</result>
</action>
</package>
</structs>

java中的实现代码为：

//自定义服务端页面跳转类
public class MyDispatcher extends StrutsResultSupport {

    @Override
    protected void doExecute(String finalLocation, ActionInvocation invocation) throws Exception {
        // TODO Auto-generated method stub
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpServletResponse response = ServletActionContext.getResponse();
        request.getRequestDispatcher(finalLocation).forward(request, response);
    }
}

//cn.hjp.action下的类
public class HelloAction implements Action {
    @Override
    public String execute() throws Exception {
        System.out.println("自定义服务端页面重定向测试");
        return "Success";
    }
}

二、配置result节点type属性为dispatcher，实现页面在服务端重定向

<structs>
<package name="hello" namespace="/aaa" extends="structs-default">
<action name="HelloAction" class="cn.hjp.action.HelloAction">
<result name="success" type="dispatcher">/Index.jsp</result>
</action>
</package>
</structs>

java代码：

//cn.hjp.action下的类
public class HelloAction implements Action {
    @Override
    public String execute() throws Exception {
        System.out.println("服务端页面重定向测试");
        return SUCCESS;
    }
}

三、配置result节点type属性为redirect，实现页面在客户端重定向

<structs>
<package name="hello" namespace="/aaa" extends="structs-default">
<action name="HelloAction" class="cn.hjp.action.HelloAction">
<result name="success" type="redirect">/Index.jsp</result>
</action>
</package>
</structs>

java代码：

//cn.hjp.action下的类
public class HelloAction implements Action {
    @Override
    public String execute() throws Exception {
        System.out.println("客户端页面重定向测试");
        return SUCCESS;
    }
}

 四、配置result节点type属性为plainText，显示纯文本，及参数注入

<structs>
<package name="hello" namespace="/aaa" extends="structs-default">
<action name="HelloAction" class="cn.hjp.action.HelloAction">
<result name="success" type="plainText">
<!--参数注入，其中的参数属性为plainText对应的类及其父类中属性-->
<param name="location">/Index.jsp</param>
<!--编码不一致会乱码-->
<param name="charSet">UTF-8</param>
</result>
</action>
</package>
</structs>

java代码：

//cn.hjp.action下的类
public class HelloAction implements Action {
    @Override
    public String execute() throws Exception {
        System.out.println("纯文本测试");
        return SUCCESS;
    }
}

五、配置result节点type属性为stream，实现文件下载

<structs>
<package name="hello" namespace="/aaa" extends="structs-default">
<action name="HelloAction" class="cn.hjp.action.HelloAction">
<result name="success" type="stream">
<param name="contentType">application/zip</param>
<!--如下zip，此处大小写不区分，但是对应action中的getZip()方法，返回InputStream类型-->
<param name="inputName">zip</param>
<!--filename自定义下载文件名-->
<param name="contentDisposition">attachment;filename="Mapping123.zip"</param>
<param name="bufferSize">1024</param>
</result>
</action>
</package>
</structs>

java代码：

public class HelloAction extends ActionSupport {
    public InputStream getZip() {
        // 读取文件流
        ServletContext context = ServletActionContext.getServletContext();
                //在WebContent下新建文件夹file，里面有Mapping.zip文件
        InputStream inputStream = context.getResourceAsStream("/file/Mapping.zip");
        return inputStream;
    }

}

调用方式：http://localhost:8080/structs2-demo1/aaa/HelloAction.action。直接下载文件

 六、配置result节点type属性为redirectAction，实现重定向到指定Action。其实该方式是对type="redirect"变相重写，通过查源码可知，ServletActionRedirectResult继承了ServletRedirectResult类，通过ServletActionRedirectResult中的execute方法执行到ServletRedirectResult中的doexecute方法，实现跳转

<structs>
<package name="hello" namespace="/aaa" extends="structs-default">
<action name="HelloAction1" class="cn.hjp.action.HelloAction1">
<result name="success" type="redirectAction">
<param name="actionName">HelloAction</param>
<!--如果不配置namespace，则默认当前namespace-->
<param name="namespace">/aaa</param>
</result>
</action>
</package>
</structs>

java代码：

public class HelloAction1 extends ActionSupport {

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        System.out.println("重定向到指定Action测试");
        return SUCCESS;
    }
}

访问路径：http://localhost:8080/structs2-demo1/aa/HelloAction1.action