Struts2学习笔记（day03）

拼搏现实的明天。 2021-12-17 12:13 350阅读 0赞

### 文章目录 ###

*  struts2-day03
 *   *  1. OGNL表达式
     *   *  1.1 OGNL:对象视图导航语言. $\{user.addr.name\} 这种写法就叫对象视图导航.
         *  1.2 OGNL不仅仅可以视图导航.支持比EL表达式更加丰富的功能.
         *  1.3 语法
         *   *  1.3.1 基本取值
             *  1.3.2 赋值
             *  1.3.3 调用方法
             *  1.3.4 调用静态方法
             *  1.3.5 创建对象(List,Map)
     *  2. OGNL与Struts2的结合
     *   *  2.1 结合原理
         *  2.2 栈原理
         *  2.3 struts2与ognl结合体现
         *   *  2.3.1 参数接收
             *  2.3.2 配置文件中
             *  2.3.3 扩展:request对象的getAttribute方法

# struts2-day03 #

## 1. OGNL表达式 ##

### 1.1 OGNL:对象视图导航语言. $\{user.addr.name\} 这种写法就叫对象视图导航. ###

### 1.2 OGNL不仅仅可以视图导航.支持比EL表达式更加丰富的功能. ###

1.使用OGNL准备工作  
代码准备  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 1]

### 1.3 语法 ###

#### 1.3.1 基本取值 ####

![在这里插入图片描述][20190708174644592.png]  
![在这里插入图片描述][20190708174649364.png]

#### 1.3.2 赋值 ####

![在这里插入图片描述][20190708174725903.png]

#### 1.3.3 调用方法 ####

![在这里插入图片描述][20190708174729727.png]

#### 1.3.4 调用静态方法 ####

![在这里插入图片描述][20190708174742134.png]

#### 1.3.5 创建对象(List,Map) ####

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

## 2. OGNL与Struts2的结合 ##

### 2.1 结合原理 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 3]![在这里插入图片描述][20190708174827646.png]

### 2.2 栈原理 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 4]![在这里插入图片描述][20190708174909739.png]  
![在这里插入图片描述][20190708174932590.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 5]

### 2.3 struts2与ognl结合体现 ###

#### 2.3.1 参数接收 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 6]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 7]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 8]![在这里插入图片描述][20190708175044946.png]

如何获得值栈对象,值栈对象与ActionContext对象是互相引用的

#### 2.3.2 配置文件中 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhbjM2Mjk3OTY_size_16_color_FFFFFF_t_70 9]

#### 2.3.3 扩展:request对象的getAttribute方法 ####

![查找顺序][20190708175210613.png]

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[20190708175210613.png]: /images/20211213/ca31180934b9406ebaa550b43a84a688.png