Struts2框架05 result标签的类型

Posted 寻渝记

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Struts2框架05 result标签的类型相关的知识,希望对你有一定的参考价值。

 

1 result标签是干什么的

  就是结果,服务器处理完返回给浏览器的结果;是一个输出结果数据的组件

  

2 什么时候需要指定result标签的类型

  把要输出的结果数据按照我们指定的数据类型进行处理 

  

3 常见的类型(在struts的默认配置文件120行有这些类型的列表)    

  3.1 dispatcher  转发(默认类型)

  3.2 redirect  重定向URL

    格式一

      <result type="redirect">
        网址(例如:http://www.baidu.com)
      </result>  

    格式二(注意:param标签的name属性是固定值location)
      <result type="redirect">
        <param name="location">
          http://www.baidu.com
        </param>
      </result>

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 2   <modelVersion>4.0.0</modelVersion>
 3   <groupId>cn.xiangxu</groupId>
 4   <artifactId>ssh02</artifactId>
 5   <version>0.0.1-SNAPSHOT</version>
 6   <packaging>war</packaging>
 7   <dependencies>
 8       <dependency>
 9           <groupId>org.apache.struts</groupId>
10           <artifactId>struts2-core</artifactId>
11           <version>2.3.8</version>
12       </dependency>
13       <dependency>
14           <groupId>org.apache.struts</groupId>
15           <artifactId>struts2-spring-plugin</artifactId>
16           <version>2.3.8</version>
17       </dependency>
18   </dependencies>
19 </project>
maven依赖文件
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 3   <display-name>ssh02s</display-name>
 4   <welcome-file-list>
 5     <welcome-file>index.html</welcome-file>
 6     <welcome-file>index.htm</welcome-file>
 7     <welcome-file>index.jsp</welcome-file>
 8     <welcome-file>default.html</welcome-file>
 9     <welcome-file>default.htm</welcome-file>
10     <welcome-file>default.jsp</welcome-file>
11   </welcome-file-list>
12   
13   <!-- 配置spring监听listener
14               用于初始化Spring容器 -->
15   <listener>
16       <listener-class>
17           org.springframework.web.context.ContextLoaderListener
18       </listener-class>
19   </listener>
20   
21   <!-- 配置Spring配置文件的位置 -->
22   <context-param>
23       <param-name>contextConfigLocation</param-name>
24       <param-value>classpath:spring-*.xml</param-value>
25   </context-param>
26   
27   <!-- 配置主控制器和过滤条件 -->
28   <filter>
29       <filter-name>mvc</filter-name>
30       <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
31   </filter>
32   <filter-mapping>
33       <filter-name>mvc</filter-name>
34       <url-pattern>/*</url-pattern>
35   </filter-mapping>
36   
37 </web-app>
web.xml
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 4     xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
 5     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
 6     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
 7     xmlns:jpa="http://www.springframework.org/schema/data/jpa"
 8     xsi:schemaLocation="
 9         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
10         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
11         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
12         http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
13         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
14         http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
15         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
16         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
17         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
18 
19     <!-- 配置组件扫描 -->
20     <context:component-scan base-package="cn.xiangxu" />
21     
22 </beans>
spring_context.xml
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6     
 7     <package name="type" namespace="/type" extends="struts-default">
 8         <action name="redirect" class="redirectAction"> <!-- 后台经过处理后,再进行重定向 -->
 9             <result name="redirect" type="redirect">
10                 http://www.baidu.com
11             </result>
12         </action>
13             
14         <action name="cq"> <!-- 直接重定向,在后台不进行任何处理 -->
15             <result type="redirect">
16                 http://cq.qq.com/
17             </result>
18         </action>
19         
20         <action name="dzsk"> <!-- 利用格式二实现 -->
21             <result type="redirect">
22                 http://www.dzshike.com/
23             </result>
24         </action>
25     </package>
26     
27 </struts>
struts.xml
 1 package cn.xiangxu.action;
 2 
 3 import org.springframework.context.annotation.Scope;
 4 import org.springframework.stereotype.Controller;
 5 
 6 @Controller
 7 @Scope("prototype")
 8 public class RedirectAction {
 9     public String execute() {
10         System.out.println("测试重定向URL");
11         return "redirect";
12     }
13 }
RedirectAction

项目结构

  

  3.3 redirectAction  重定向Action

    格式一:请求路径不变,仅仅改变请求名
      <result name="xxx" type="redirectAction">
        请求名/请求名.action
      </result>

    格式二:请求路径和请求名都该改变
      <result name="xxx" type="redirectAction">
        <param name="namespace">/路径名</param>
        <param name="actionName">请求名/请求名.action</param>
      </result>

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6 
 7     <package name="test" namespace="/test" extends="struts-default"> <!-- namespace是配置访问路径,extends是配置继承默认struts文件 -->
 8         <action name="demo" class="testAction"> <!-- name是配置访问网名,class是配置action类 -->
 9             <result name="success">
10                 /WEB-INF/jsp/msg.jsp
11             </result>
12         </action>
13     </package>
14     
15     <package name="type" namespace="/type" extends="struts-default">
16     
17         
18         <action name="demo" class="testAction">
19             <result name="success">
20                 /WEB-INF/jsp/msg.jsp
21             </result>
22         </action>
23         
24         <action name="redirectAction01" class="redirectActionAction"> <!-- 重定向1:只改变请求网名 -->
25             <result name="redirectAction" type="redirectAction">
26                 demo
27             </result>
28             <result name="redirectAction" type="redirectAction">
29                 demo
30             </result>
31         </action>
32         <action name="redirectAction02" class="redirectActionAction"> <!-- 重定向2:路径和网名都改变 -->
33             <result name="redirectAction" type="redirectAction">
34                 <param name="namespace">/test</param>
35                 <param name="actionName">demo</param>
36             </result>
37         </action>
38         
39     </package>
40     
41 </struts>
struts.xml
 1 package cn.xiangxu.action;
 2 
 3 import org.springframework.context.annotation.Scope;
 4 import org.springframework.stereotype.Controller;
 5 
 6 @Controller
 7 @Scope("prototype")
 8 public class RedirectActionAction {
 9     public String execute() {
10         System.out.println("测试重定向action");
11         return "redirectAction";
12     }
13 }
RedirectActionAction.java

项目结构

  

  3.4 stream 流,处理图片 

    3.4.1 格式     

    <result name="success" type="stream">
      <param name="contentType">image/jpeg</param>
      <param name="inputName">imageStream</param>
      <param name="contentDisposition">attachment;filename="document.pdf"</param>
      <param name="bufferSize">1024</param>
    </result>


    3.4.2 参数解释

      contentType 定义媒体类型
      inputName 必须是一个inputStream类型的流
      contentDisposition 强制下载保存(可选)
      bufferSize 指定缓存区域的大小(可选)


    3.4.3 案例:向浏览器发送图片数据并显示

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6 
 7     
 8     <package name="type" namespace="/type" extends="struts-default">
 9         
10         
11         <action name="stream" class="streamAction">
12             <result name="success" type="stream">
13                 <param name="contentType">image/png</param>
14                 <param name="inputName">image</param> <!-- image是ImageAction中的一个成员变量 -->
15             </result>
16         </action>
17         
18     </package>
19     
20     
21     
22 </struts>
struts.xml
 1 package cn.xiangxu.action;
 2 
 3 import java.awt.Color;
 4 import java.awt.Graphics2D;
 5 import java.awt.image.BufferedImage;
 6 import java.io.ByteArrayInputStream;
 7 import java.io.ByteArrayOutputStream;
 8 import java.io.IOException;
 9 import java.io.InputStream;
10 
11 import javax.imageio.ImageIO;
12 
13 import org.springframework.context.annotation.Scope;
14 import org.springframework.stereotype.Controller;
15 
16 @Controller
17 @Scope("prototype")
18 public class StreamAction {
19     
20 private InputStream image;
21     
22     public String execute() throws IOException {
23         // 设置图片
24         BufferedImage img = new BufferedImage(399, 60, BufferedImage.TYPE_3BYTE_BGR);
25         
26         // 获取画笔
27         Graphics2D g = img.createGraphics();
28         g.setColor(Color.white);
29         g.drawString("hello fury,测试stream", 10, 30);
30         
31         // 将图片转成字节数组
32         ByteArrayOutputStream out = new ByteArrayOutputStream(); 
33         ImageIO.write(img, "png", out);
34         out.close();
35         
36         // 将字节数组放到字节流中
37         byte [] data = out.toByteArray();
38         image = new ByteArrayInputStream(data);
39         
40         return "success";
41     }
42 
43     public InputStream getImage() {
44         return image;
45     }
46 
47     public void setImage(InputStream image) {
48         this.image = image;
49     }
50 }
StreamAction.java

     项目结构

      

  3.5 json  用于处理ajax请求

    导包:struts2-json-plugin
      注意:package标签中的extends属性值变更为json-default(json-default继承了struts-default)

        <

以上是关于Struts2框架05 result标签的类型的主要内容,如果未能解决你的问题,请参考以下文章

Struts2 结果和结果类型

Struts2中 Result类型配置详解

Struts2中 Result类型配置详解(转)

Struts2框架使用之关于Struts2的result配置

SSH学习-struts2的result类型

Struts2之result中标准结果代码