带有枚举的spring-form：options标签

• Z时代
• 2024-01-10
• 分类：问答

我在显示带有正确值的下拉列表时遇到麻烦。我使用的<spring-form:select>，<spring-

form:options>并且<spring-

form:option>标签，我只是不能得到它，以显示正确的选项。使用以下代码，我应该只列出“选项2”，“选项7”和“选项8”。

*注意-我不想显示每个可能的Enum值，但是出于某种原因，Spring似乎希望显示所有这些值。似乎完全忽略了提供给<spring-form:options>标签的列表。

JSP标签

<spring-form:select path="selectOptions">
    <spring-form:option value="" label="*** Select Option ***" />
    <spring-form:options path="${availableOptions}" />
</spring-form:select>

枚举

public enum SelectOptions {
    // CHECKSTYLE_OFF: LineLength
    /**
     * Option 1.
     */
    OPTION_1(1, "Option 1"),
    /**
     * Option 2.
     */
    OPTION_2(2, "Option 2"),
    /**
     * Option 3.
     */
    OPTION_3(3, "Option 3"),
    /**
     * Option 4.
     */
    OPTION_4(4, "Option 4"),
    /**
     * Option 5.
     */
    OPTION_5(5, "Option 5"),
    /**
     * Option 6.
     */
    OPTION_6(6, "Option 6"),
    /**
     * Option 7.
     */
    OPTION_7(7, "Option 7"),
    /**
     * Option 8.
     */
    OPTION_8(8, "Option 8"),
    /**
     * Option 9.
     */
    OPTION_9(9, "Option 9"),
    /**
     * Option 10.
     */
    OPTION_10(10, "Option 10");
    private int id;
    private String description;
    /**
     * Constructor.
     *
     * @param id the id
     * @param description the description
     */
    private SelectOptions(final int id, final String description) {
        this.id = id;
        this.description = description;
    }
    /**
     * Retrieves the {@link SelectOptions} associated with the passed in id.
     *
     * @param id the id associated with the SelectOptions
     * @return the SelectOptions
     */
    public static SelectOptions getInstance(final int id) {
        for (final SelectOptions selectOptions : SelectOptions.values()) {
            if (selectOptions.id == id) {
                return selectOptions;
            }
        }
        throw new IllegalArgumentException("SelectOptions could not be determined with id [" + id + "]");
    }
    /**
     * Retrieves the {@link SelectOptions} associated with the passed in description.
     *
     * @param description the description associated with the SelectOptions
     * @return the SelectOptions
     */
    public static SelectOptions getInstance(final String description) {
        for (final SelectOptions selectOptions : SelectOptions.values()) {
            if (selectOptions.description == description) {
                return selectOptions;
            }
        }
        throw new IllegalArgumentException("SelectOptions could not be determined with description [" + description + "]");
    }
    /**
     * Simple Getter.
     *
     * @return the id
     */
    public int getId() {
        return this.id;
    }
    /**
     * Simple Setter.
     *
     * @param id the id to set
     */
    public void setId(final int id) {
        this.id = id;
    }
    /**
     * Simple Getter.
     *
     * @return the description
     */
    public String getDescription() {
        return this.description;
    }
    /**
     * Simple Setter.
     *
     * @param description the description to set
     */
    public void setDescription(final String description) {
        this.description = description;
    }
}

控制者

public class SpringController implements SpringControllerInterface {
    /**
     * /WEB-INF/jsp/myJSP.jsp.
     */
    private static final String PAGE = "/WEB-INF/jsp/myJSP.jsp";
    /**
     * {@inheritDoc}
     */
    @Override
    public ModelAndView load(final Model model) {
        final ModelAndView mav = new ModelAndView(PAGE);
        final List<SelectOptions> availableOptions = this.getAvailableOptions();
        mav.addObject("availableOptions", availableOptions);
        return mav;
    }
    /**
     * {@inheritDoc}
     */
    @Override
    public ModelAndView save(final Model model) {
        final ModelAndView mav = new ModelAndView(PAGE);
        // TODO
        return mav;
    }
    /**
     * {@inheritDoc}
     */
    @Override
    public Model getModel() {
        return new ModelImpl();
    }
    /**
     * @return a list of available options
     */
    public List<SelectOptions> getAvailableOptions() {
        final List<SelectOptions> availableOptions = Lists.newArrayList();
        availableOptions.add(SelectOptions.OPTION_1);
        availableOptions.add(SelectOptions.OPTION_7);
        availableOptions.add(SelectOptions.OPTION_8);
        return availableOptions;
    }
    }

模型

public class ModelImpl implements Model {
    private SelectOptions selectOptions;
    /**
     * Simple Getter.
     *
     * @return the selectOptions
     */
    @Override
    public SelectOptions getSelectOptions() {
        return this.selectOptions;
    }
    /**
     * Simple Setter.
     *
     * @param selectOptions the selectOptions to set
     */
    @Override
    public void setSelectOptions(final SelectOptions selectOptions) {
        this.selectOptions = selectOptions;
    }
}

回答：

看来此问题的解决方案是我在<spring-form:options>标签中使用了属性“ path” 。应该是“项目”，而不是“路径”。

更正后的JSP片段：

<spring-form:select path="selectOptions">
    <spring-form:option value="" label="*** Select Option ***" />
    <spring-form:options items="${availableOptions}" />
</spring-form:select>

以上是 带有枚举的spring-form：options标签 的全部内容， 来源链接： utcz.com/qa/399212.html