Struts2学习笔记（day02）

心已赠人 2021-12-14 07:03 433阅读 0赞

### 文章目录 ###

*  struts2-day02
 *   *  1. 访问servletAPI方式
     *   *  1.1原理
         *  1.2 通过ActionContext
         *  1.3 通过ServletActionContext
         *  1.4 通过实现接口方式
     *  2. 如何获得参数
     *   *  2.1 扩展
         *   *  2.1.1strutsMVC
             *  2.1.2 Action生命周期
         *  2.2 属性驱动获得参数
         *  2.3 对象驱动
         *  2.4 模型驱动
     *  3. 集合类型参数封装
     *   *  3.1 list
         *  3.2 map
     *  4. 结果跳转方式
     *   *  4.1 转发
         *  4.2 重定向
         *  4.3 转发到Action
         *  4.4 重定向到Action

# struts2-day02 #

## 1. 访问servletAPI方式 ##

### 1.1原理 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70]

### 1.2 通过ActionContext ###

//如何在action中获得原生ServletAPI
    public class Demo5Action extends ActionSupport {
    
    	public String execute() throws Exception {
    		//request域=> map (struts2并不推荐使用原生request域)
    		//不推荐
    		Map<String, Object> requestScope = (Map<String, Object>) ActionContext.getContext().get("request");
    		//推荐
    		ActionContext.getContext().put("name", "requestTom");
    		//session域 => map
    		Map<String, Object> sessionScope = ActionContext.getContext().getSession();
    		sessionScope.put("name", "sessionTom");
    		//application域=>map
    		Map<String, Object> applicationScope = ActionContext.getContext().getApplication();
    		applicationScope.put("name", "applicationTom");
    		
    		return SUCCESS;
    	}

### 1.3 通过ServletActionContext ###

//如何在action中获得原生ServletAPI
    public class Demo6Action extends ActionSupport {
    	//并不推荐
    	public String execute() throws Exception {
    		//原生request
    		HttpServletRequest request = ServletActionContext.getRequest();
    		//原生session
    		HttpSession session = request.getSession();
    		//原生response
    		HttpServletResponse response = ServletActionContext.getResponse();
    		//原生servletContext
    		ServletContext servletContext = ServletActionContext.getServletContext();
    		return SUCCESS;
    	}
    }

### 1.4 通过实现接口方式 ###

//如何在action中获得原生ServletAPI
    public class Demo7Action extends ActionSupport implements ServletRequestAware {
    	
    	
    	private HttpServletRequest request;
    
    	public String execute() throws Exception { 
    		
    		System.out.println("原生request:"+request);
    		return SUCCESS;
    	}
    
    	@Override
    	public void setServletRequest(HttpServletRequest request) {
    		this.request = request;
    	}
    
    	
    }

## 2. 如何获得参数 ##

### 2.1 扩展 ###

#### 2.1.1strutsMVC ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 1]

#### 2.1.2 Action生命周期 ####

1.每次请求到来时,都会创建一个新的Action实例
    		2.Action是线程安全的.可以使用成员变量接收参数

### 2.2 属性驱动获得参数 ###

![在这里插入图片描述][20190706215235327.png]![在这里插入图片描述][20190706215247860.png]

### 2.3 对象驱动 ###

![在这里插入图片描述][2019070621533786.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 2]

### 2.4 模型驱动 ###

![在这里插入图片描述][20190706215412908.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 3]

## 3. 集合类型参数封装 ##

### 3.1 list ###

![在这里插入图片描述][20190706215452799.png]  
![在这里插入图片描述][20190706215504107.png]

### 3.2 map ###

![在这里插入图片描述][20190706215525650.png]  
![在这里插入图片描述][20190706215543689.png]

## 4. 结果跳转方式 ##

### 4.1 转发 ###

![在这里插入图片描述][20190706215607950.png]

### 4.2 重定向 ###

![在这里插入图片描述][20190706215612481.png]

### 4.3 转发到Action ###

![在这里插入图片描述][20190706215708339.png]

### 4.4 重定向到Action ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 4]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 1]: /images/20211214/102dcf0e868740a7bd215f6a27fd96a6.png
[20190706215235327.png]: https://img-blog.csdnimg.cn/20190706215235327.png
[20190706215247860.png]: /images/20211214/6b5e158357dc4685b2b6fe76fbea2b8b.png
[2019070621533786.png]: /images/20211214/e5ad936ddae64925ab5b3d2b84f3439a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 2]: /images/20211214/4ef4e08e11f24ae3813243a2ed58e614.png
[20190706215412908.png]: https://img-blog.csdnimg.cn/20190706215412908.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 3]: /images/20211214/43e67f72bc60409c9079c36876a3dcc9.png
[20190706215452799.png]: /images/20211214/1e26d006ef0e480fb32b70a92fab4b72.png
[20190706215504107.png]: /images/20211214/362c9382c29e4c129c64687dc3bfeede.png
[20190706215525650.png]: /images/20211214/08c8e8c8062a4bdcbe07cc4823cdd433.png
[20190706215543689.png]: /images/20211214/f134a18bd8af43bd8107352b1ff4efb4.png
[20190706215607950.png]: /images/20211214/dfa56443d31749c4ab0fa2d98ea9f115.png
[20190706215612481.png]: /images/20211214/e6290bbd357d4478b47bd8b2cbe68fef.png
[20190706215708339.png]: /images/20211214/89eb37b697694814b9a3b1b5f8b93518.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 4]: /images/20211214/3abb8abc3d824a3f9b6439aacd0f668d.png