使用JSTL提取主鍵

Question

我試圖使用JSTL在動態生成的表的每一行上獲取一個刪除按鈕。 使用forEach方法生成表時，所有數據庫字段都沒有問題。 當我嘗試對ID（整數和表主鍵）執行相同操作時，它會在類型logon.Car上找到錯誤“Property'cars_id'”。 可以使用resultList.get（1）.getID（）從結果列表中提取它們，並且它在屏幕上打印到jsp頁面沒問題。

這里有什么我想念的嗎？ 有任何想法嗎？

我的JSP：

 <% 
List<Car> resultList = new ArrayList<Car>();
resultList=(List<Car>)request.getAttribute("ResultList");

%>
<table border="1">
<thead title="Current Cars"/>
<tr><th>Make:</th><th>Model:</th><th>Year:</th><th>Colour:</th><th>Information:</th></tr>
<tbody>
<c:forEach items="${ResultList}" var="car">
<tr>
    <td>${car.carMake}</td>
    <td>${car.model}</td>
    <td>${car.carYear}</td>
    <td>${car.carColour}</td>
    <td>${car.information}</td>
  <td>
        <form action="CarServlet" method="get">
            <input type="hidden" name="carId" value="${car.cars_id}" />
            <input type="submit" value="Remove" name="remove">
        </form>
    </td> 
</tr>
</c:forEach>
</tbody>
</table>

我的Car.java

@Entity
@Table(name = "cars")
public class Car {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int cars_id;

@Column(name = "cars_make")
private String carMake;

@Column(name = "year")
private String carYear;

@Column(name = "colour")
private String carColour;

@Column(name="information")
private String information;

@Column(name="model")
private String carModel;

//NOTE:"user_id" below in (@JoinColumn(name="user_id"))...is the name
//of the field in my sql that corresponds to id from User table 

    @ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({ @JoinColumn(name = "user_id", referencedColumnName="id") })
private User user;



public User getUser() {
    if (user == null) {
        user = new User();
    }
    return user;
 }

public void setUser(User user) {
    this.user = user;
}

    public int getCar_id() {
    return cars_id;
}

public void setCar_id(int cars_id) {
    this.cars_id = cars_id;
}

public String getCarMake() {
    return carMake;
}

public void setCarMake(String carMake) {
    this.carMake = carMake;
}

public String getModel() {
    return carModel;
}

public void setModel(String carModel) {
    this.carModel = carModel;
}

public String getCarYear() {
    return carYear;
}

public void setCarYear(String carYear) {
    this.carYear = carYear;
}

public String getCarColour() {
    return carColour;
}

public void setCarColour(String carColour) {
    this.carColour = carColour;
}

public String getInformation() {
    return information;
}

public void setInformation(String information) {
    this.information = information;
}
 }

Answer 1

${car.cars_id}應為${car.car_id}

EL字段名稱應與bean方法名稱匹配，而不是與類字段本身匹配。