Struts2學習筆記(六)——Action處理請求參數

在struts2框架中關於Action處理請求參數有兩種方案(三個方式)，表單屬性的名稱應該和在Action類中定義的成員屬性或者在JavaBean中定義的成員屬性名稱一樣：

1、屬性驅動

  1)直接在Action類中定義成員屬性來接收請求參數 (將Action當成javaBean)，在Action中還需要定義成員屬性的setter方法。

表單信息：

<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類：

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";
    }
}

前台輸入信息：

后台顯示結果：

  2)直接將javaBean做為Action的屬性，在頁面上必須使用ognl表達式來描述組件的name屬性

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;
    }
}

表單信息：

<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";
    }
}

前台輸入信息：

后台顯示結果：

這種方式是通過name="params"的攔截器實現參數封裝的。

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

2、模型驅動

模型驅動處理請求參數的步驟為：

步驟:

• 1.Action必須實現ModelDriven接口
• 2.重寫getModel()方法，返回一個javaBean對象.
• 3.實例化一個javaBean對象.

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;
    }
}

表單信息：

<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;
    }
}

前台輸入信息：

后台顯示結果：

4、封裝數據到Collection或數組

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;
    }
}

表單信息：

<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";
    }
}

前台輸入信息：

后台顯示結果：

5、封裝數據到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;
    }
}

表單信息：

<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";
    }
}

 

前台輸入信息：

后台顯示結果：