Question

我有以下两个有一对多映射的类。学生可以选择多个科目。

@Entity
@Table ( name = "studentinfo" )
public class student {

    @Id
    @GeneratedValue ( strategy = GenerationType.IDENTITY )
    @Column ( name = "stud_id" )
    private int studId;

    @NotEmpty
    @Column ( name = "stud_name" )
    private String studname;

    @NotEmpty
    @Column ( name = "stud_age" )
    private int studage;

    @OneToMany (cascade = CascadeType.ALL)
    @JoinColumn ( name = "stud_sub_id" )
    private List<subject> subject;

    //getters and setters

主题模型类

@Entity
@Table ( name = "subject" )
public class subject {

@Id
@GeneratedValue ( strategy = GenerationType.IDENTITY )
@Column ( name = "Sub_id" )
private int subId;

@NotEmpty
@Column ( name = "Subj_name" )
private String subjname;

//getters and setters

我如何使用表格：选择标签以显示主题列表，以便我可以为学生选择多个主题，同时在编辑特定学生详细信息时，我需要为他显示所选主题。这是我目前的jsp代码。

<form:form commandName="studentdetails" action="${pageContext.request.contextPath}/stud/studentadded" method="post">
     <form:hidden path="studId"/>

    <table>

        <tr>
            <td><label for="studname">Name: </label> </td>
            <td><form:input path="studname" id="name"/></td>
             <td><form:errors path="studname" cssStyle="color:#ff0000"></form:errors></td>
        </tr>

        <tr>
            <td><label for="studage">Age: </label> </td>
            <td><form:input path="studage" id="age"/></td>
             <td><form:errors path="studage" cssStyle="color:#ff0000"></form:errors></td>
        </tr>
          <tr>
            <td><label for="subject.subjname">Opting Subject: </label> </td>
            <td>
                <form:select path="subject.subjname"> 
                <form:option value="" label="select"></form:option>     
                <form:options items="${subjects}"/>         
                </form:select>
            </td>
             <td><form:errors path="subject.subjname" cssStyle="color:#ff0000"></form:errors></td>
        </tr>
         <tr> 
            <td colspan="3">

                <input type="Submit" value="Add"/>

            </td>
        </tr>

     </table>
      </form:form>

我的表格支持对象属于学生班级。这里的项目=＆＃34; $ {subject}＆＃34;包含我从控制器传递的List<String>中的主题列表。对于path =＆＃34; subject.subjname＆＃34;它显示以下错误;

org.springframework.beans.NotReadablePropertyException: Invalid property 'subject.subjname' of bean class [com.model.studentinfo]: Bean property 'subject.subjname' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

但我有适当的吸气剂和setter方法。如果我使用path =＆＃34; subject＆＃34;，我在提交时收到以下错误。

400 The request sent by the client was syntactically incorrect

但我没有使用任何日期属性。我如何制作表格：选择加入和编辑学生的工作。请帮帮我。

Answer 1

您必须在表单后备对象“studentdetails”中创建一个String of input inputSubjects字段，并在路径中使用以下内容：

<form:form modelAttribute="studentdetails" action="${pageContext.request.contextPath}/stud/studentadded" method="post">

    <form:select multiple="true" path="inputSubjects"> 
            <form:option value="" label="select"></form:option>     
            <form:options items="${subjects}"/>         
    </form:select>

如何使用表格：选择spring mvc

1 个答案: