javax.el.PropertyNotFoundException: class 'PureJavaClasses.employeeClass' 没有属性 'Id'

Question

我一直在尝试在 Servlet 的帮助下通过 ArrayList.The JDBC 部分在 JSP 中打印结果集，似乎所有 right.The ArrayList 都可以获得在 JSP 内并且可以是 printed.But 当我想用 <c:forEach> 标签迭代传递到 JSP 的列表时，它说我的 bean class 'PureJavaClasses.employeeClass' 没有属性 'Id'。我在 SO 上尝试了很多不同的解决方案，但在 vain.I 中，我完全不知道要做什么 do.I 我是 JavaEE 的初学者。

这是我的 Bean class:

public class employeeClass implements java.io.Serializable {
private int id;
private String name;
private String job;
private int subjectId;
private int salary;

public employeeClass() {

}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

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

public String getJob() {
    return job;
}

public void setJob(String job) {
    this.job = job;
}

public int getSubjectid() {
    return subjectId;
}

public void setSubjectid(int subjectId) {
    this.subjectId = subjectId;
}

public int getSalary() {
    return salary;
}

public void setSalary(int salary) {
    this.salary = salary;
}

@Override
public String toString() {
    return  "id=" + id +
            ", name=" + name +
            ", job=" + job +
            ", subjectId=" + subjectId +
            ", salary=" + salary;
}
}

这是 servlet：

private void show_table(HttpServletRequest request,HttpServletResponse response){
    Connection connection = ServletLogin.connection;
    String query = "SELECT * FROM `dog`.`employee`";
    ArrayList<employeeClass> list = new ArrayList<>();
    try {
        PreparedStatement pst = connection.prepareStatement(query);
        ResultSet rs = pst.executeQuery();
        while(rs.next()){
            employeeClass obj2 = new employeeClass();
            obj2.setId(rs.getInt("ID"));
            obj2.setName(rs.getString("Name"));
            obj2.setJob(rs.getString("Job_Designation"));
            obj2.setSubjectid(rs.getInt("Subject ID"));
            obj2.setSalary(rs.getInt("Salary"));
            list.add(obj2);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    request.setAttribute("listEmp",list);
    try {
        request.getRequestDispatcher("/Pages/EmployeeTable.jsp").forward(request,response);
    } catch (ServletException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

这是我的 EmployeeTable.jsp :

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="java.util.ArrayList"%>
<html>

<head>
    <title>Employee List</title>
</head>
<body>
<% ArrayList list1 =(ArrayList) request.getAttribute("listEmp"); %>
<%=list1%>
    <table>
        <th>ID</th>
        <th>Name</th>
        <th>Job Designation</th>
        <th>Subject ID</th>
        <th>Salary</th>
        <c:forEach items="${listEmp}" var="list">
            <tr>
                <td><c:out value="${list.Id}"/></td>
                <td><c:out value="${list.name}"/></td>
                <td><c:out value="${list.job}"/></td>
                <td><c:out value="${list.subjectId}"/></td>
                <td><c:out value="${list.salary}"/></td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

这是我的 web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>ServletLogin</servlet-name>
        <servlet-class>ServletLogin</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ServletEmployee</servlet-name>
        <servlet-class>ServletEmployee</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServletLogin</servlet-name>
        <url-pattern>/ServletLogin</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ServletEmployee</servlet-name>
        <url-pattern>/ServletEmployee</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>

</web-app>

Answer 1

我认为您需要通过提供正确的名称来解决。比如用id代替id等应该可以解决

<td><c:out value="${list.id}"/></td>

javax.el.PropertyNotFoundException: class 'PureJavaClasses.employeeClass' 没有属性 'Id'

javax.el.PropertyNotFoundException: The class 'PureJavaClasses.employeeClass' does not have the property 'Id'

java

jsp

servlets

jstl

el

javax.el.PropertyNotFoundException: class 'PureJavaClasses.employeeClass' 没有 属性 'Id'

javax.el.PropertyNotFoundException: The class 'PureJavaClasses.employeeClass' does not have the property 'Id'

java

jsp

servlets

jstl

el

javax.el.PropertyNotFoundException: class 'PureJavaClasses.employeeClass' 没有属性 'Id'