Struts2学习笔记(七)——Action处理请求参数

在struts2框架中关于Action处理请求参数有两种方案(三个方式)，表单属性的名称应该和在Action类中定义的成员属性或者在JavaBean中定义的成员属性名称一样：

1、属性驱动

  1)直接在Action类中定义成员属性来接收请求参数 (将Action当成javaBean)，在Action中还需要定义成员属性的setter方法。

表单信息：

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2     name:<input type="text" name="name"><br>3     password:<input type="password" name="password"><br>4     <input type="submit" value="提交">5 </form>

Action类：

 1 public class TestAction { 2     private String name; 3     private String password; 4      5     public String getName() { 6         return name; 7     } 8  9     public void setName(String name) {10         this.name = name;11     }12 13     public String getPassword() {14         return password;15     }16 17     public void setPassword(String password) {18         this.password = password;19     }20 21     public String execute() {22         System.out.println("name: " + name);23         System.out.println("password: " + password);24         return "success";25     }26 }

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  2)直接将javaBean做为Action的属性，在页面上必须使用ognl表达式来描述组件的name属性

1 username:<input type="text" name="user.username"><br>

JavaBean：

 1 public class Person { 2     private String name; 3     private String password; 4   5     public String getName() { 6         return name; 7     } 8     public void setName(String name) { 9          this.name = name;10     }11     public String getPassword() {12         return password;13     }14     public void setPassword(String password) {15         this.password = password;16     }17 }

表单信息：

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2     name:<input type="text" name="person.name"><br>3     password:<input type="password" name="person.password"><br>4     <input type="submit" value="提交">5 </form>

Action：

 1 public class TestAction { 2     private Person person; 3      4     public Person getPerson() { 5         return person; 6     } 7  8     public void setPerson(Person person) { 9         this.person = person;10     }11 12     public String execute() {13         System.out.println("name: " + person.getName());14         System.out.println("password: " + person.getPassword());15         return "success";16     }17 }

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这种方式是通过name="params"的拦截器实现参数封装的。

1 <interceptor name="params" class="com.opensymphony.xwork2.interceptor.ParametersInterceptor"/>

2、模型驱动

模型驱动处理请求参数的步骤为：

步骤:

• 1.Action必须实现ModelDriven接口
• 2.重写getModel()方法，返回一个javaBean对象.
• 3.实例化一个javaBean对象.

JavaBean：

 1 public class Person { 2     private String name; 3     private String password; 4     public String getName() { 5         return name; 6     } 7     public void setName(String name) { 8         this.name = name; 9     }10     public String getPassword() {11         return password;12     }13     public void setPassword(String password) {14         this.password = password;15     }16 }

表单信息：

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2     name:<input type="text" name="name"><br>3     password:<input type="password" name="password"><br>4     <input type="submit" value="提交">5 </form>

Action：

 1 public class TestAction implements ModelDriven { 2     private Person person = new Person(); 3      4     public Person getPerson() { 5         return person; 6     } 7  8     public void setPerson(Person person) { 9         this.person = person;10     }11 12     public String execute() {13         System.out.println("name: " + person.getName());14         System.out.println("password: " + person.getPassword());15         return "success";16     }17 18     @Override19     public Object getModel() {20         return person;21     }22 }

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4、封装数据到Collection或数组

JavaBean：

 1 public class Person { 2     private String name; 3     private String password; 4     public String getName() { 5         return name; 6     } 7     public void setName(String name) { 8         this.name = name; 9     }10     public String getPassword() {11         return password;12     }13     public void setPassword(String password) {14         this.password = password;15     }16 }

表单信息：

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2     name1:<input type="text" name="list[0].name"><br>3     password1:<input type="password" name="list[0].password"><hr>4     name2:<input type="text" name="list[1].name"><br>5     password2:<input type="password" name="list[1].password"><br>6     <input type="submit" value="提交">7 </form>

Action：

 1 public class TestAction { 2     private List<Person> list; 3  4     public List<Person> getList() { 5         return list; 6     } 7  8     public void setList(List<Person> list) { 9         this.list = list;10     }11 12     public String execute() {13         System.out.println("name1: " + list.get(0).getName());14         System.out.println("password1: " + list.get(0).getPassword());15         System.out.println("name2: " + list.get(1).getName());16         System.out.println("password2: " + list.get(1).getPassword());17         return "success";18     }19 }

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5、封装数据到Map

JavaBean：

 1 public class Person { 2     private String name; 3     private String password; 4     public String getName() { 5         return name; 6     } 7     public void setName(String name) { 8         this.name = name; 9     }10     public String getPassword() {11         return password;12     }13     public void setPassword(String password) {14         this.password = password;15     }16 }

表单信息：

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2     name1:<input type="text" name="map['one'].name"><br>3     password1:<input type="password" name="map['one'].password"><hr>4     name2:<input type="text" name="map['two'].name"><br>5     password2:<input type="password" name="map['two'].password"><br>6     <input type="submit" value="提交">7 </form>

Action：

public class TestAction {    private Map<String, Person> map;    public Map<String, Person> getMap() {        return map;    }    public void setMap(Map<String, Person> map) {        this.map = map;    }    public String execute() {        System.out.println("name1: " + map.get("one").getName());        System.out.println("password1: " + map.get("one").getPassword());        System.out.println("name2: " + map.get("two").getName());        System.out.println("password2: " + map.get("two").getPassword());        return "success";    }}

 

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