Java 如何在Struts 2中使用ModelDriven为action类中的模型对象设置属性值？

使用此代码：

StudentAction.java:

public class StudentAction extends ActionSupport implements ModelDriven {

    private List studentList;
    Student student;
    StudentDAO sdo = new StudentDAO();
   
    public String delete() {
        System.out.println("delete action");
        System.out.println(student.getId()); //not setting value of id
        
        sdo.delete(student.getId());

        return SUCCESS;
    }

  @Override
  public Object getModel() {
    return student;
 }
 //getter and setter
}

public class Student  implements java.io.Serializable {
    private Long id;
    private String name;
    private String address;
    //getter and setter
}

<s:iterator value="studentList" var="ss">
    <s:property value="id"/>
    <s:property value="name"/>
    <s:property value="address"/>
    <a href="delete?id= <s:property value="id"/>">delete</a><br>
</s:iterator><br>

Student.java:

public class StudentAction extends ActionSupport implements ModelDriven {

    private List studentList;
    Student student;
    StudentDAO sdo = new StudentDAO();
   
    public String delete() {
        System.out.println("delete action");
        System.out.println(student.getId()); //not setting value of id
        
        sdo.delete(student.getId());

        return SUCCESS;
    }

  @Override
  public Object getModel() {
    return student;
 }
 //getter and setter
}

public class Student  implements java.io.Serializable {
    private Long id;
    private String name;
    private String address;
    //getter and setter
}

<s:iterator value="studentList" var="ss">
    <s:property value="id"/>
    <s:property value="name"/>
    <s:property value="address"/>
    <a href="delete?id= <s:property value="id"/>">delete</a><br>
</s:iterator><br>

在JSP中：

public class StudentAction extends ActionSupport implements ModelDriven {

    private List studentList;
    Student student;
    StudentDAO sdo = new StudentDAO();
   
    public String delete() {
        System.out.println("delete action");
        System.out.println(student.getId()); //not setting value of id
        
        sdo.delete(student.getId());

        return SUCCESS;
    }

  @Override
  public Object getModel() {
    return student;
 }
 //getter and setter
}

public class Student  implements java.io.Serializable {
    private Long id;
    private String name;
    private String address;
    //getter and setter
}

<s:iterator value="studentList" var="ss">
    <s:property value="id"/>
    <s:property value="name"/>
    <s:property value="address"/>
    <a href="delete?id= <s:property value="id"/>">delete</a><br>
</s:iterator><br>

当我将

id

的值从JSP传递到

delete

操作时，我想初始化

Student

的

id

属性

---

如何执行此操作？

使用操作字段设置参数

id

：

public class StudentAction extends ActionSupport {

    private List studentList;
    Student student;
    StudentDAO sdo = new StudentDAO();
     private Long id;
    //getter and setter


    public String delete() {
        System.out.println("delete action");
        System.out.println(getId()); 

        sdo.delete(getId());

        return SUCCESS;
    }
}

如果要实现

ModelDriven

，还需要为模型添加代码

private Student model = new Student();

public Object getModel() {
  return model;
}

---

代码如文档所示。

RomanC所问的是您的模型在哪里？您如何在您的系统中实现

ModelDriven

功能action@SaifAsif实际上，我需要知道它是如何实现的，因为没有它，代码就无法编译。这是另一回事。我假设它由OP@SaifAsif不，这是代码的必要部分，并且您的假设是不确定的。对于“代码的必要部分”，而不是使用单独的Id，我要初始化

Student

pojo的Id属性

sdo.delete（getId（））我想使用
sdo.delete（student.getId（））这样，您应该在设置参数之前实例化一个
Student
对象。但这在迭代中，但这不是初始化。我编辑了我的答案，以向您显示模型的初始化位置。