Struts2学习笔记(六)——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：

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

Action类：

 public class TestAction {
     private String name;
     private String password;

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public String execute() {
         System.out.println("name: " + name);
         System.out.println("password: " + password);
         return "success";
     }
 }

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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

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

JavaBean：

 public class Person {
     private String name;
     private String password;

     public String getName() {
         return name;
     }
     public void setName(String name) {
          this.name = name;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
 }

表单信息：

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

Action：

 public class TestAction {
     private Person person;

     public Person getPerson() {
         return person;
     }

     public void setPerson(Person person) {
         this.person = person;
     }

     public String execute() {
         System.out.println("name: " + person.getName());
         System.out.println("password: " + person.getPassword());
         return "success";
     }
 }

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这种方式是通过name="params"的拦截器实现参数封装的。

 <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：

 public class Person {
     private String name;
     private String password;
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
 }

表单信息：

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

Action：

 public class TestAction implements ModelDriven {
     private Person person = new Person();

     public Person getPerson() {
         return person;
     }

     public void setPerson(Person person) {
         this.person = person;
     }

     public String execute() {
         System.out.println("name: " + person.getName());
         System.out.println("password: " + person.getPassword());
         return "success";
     }

     @Override
     public Object getModel() {
         return person;
     }
 }

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4、封装数据到Collection或数组

JavaBean：

 public class Person {
     private String name;
     private String password;
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
 }

表单信息：

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

Action：

 public class TestAction {
     private List<Person> list;

     public List<Person> getList() {
         return list;
     }

     public void setList(List<Person> list) {
         this.list = list;
     }

     public String execute() {
         System.out.println("name1: " + list.get(0).getName());
         System.out.println("password1: " + list.get(0).getPassword());
         System.out.println("name2: " + list.get(1).getName());
         System.out.println("password2: " + list.get(1).getPassword());
         return "success";
     }
 }

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5、封装数据到Map

JavaBean：

 public class Person {
     private String name;
     private String password;
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
 }

表单信息：

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