Java 春天如何使用PropertyEditor转换对象属性？

我有一个带有Spring表单的jsp页面：

<form:form id="edit-form" method="POST" commandName="item"
                    action="items">
    <form:input id="title" path="title" type="text" />

    <form:textarea id="description" path="description"></form:textarea>

    <form:input id="timeLeft" type="text" path="timeLeft" />

    <button type="submit" id="sell-item">Create/Edit</button>

</form:form>

TimeleftPropertyEditor：

public class TimeleftPropertyEditor extends PropertyEditorSupport {
private static final int MILLIS_IN_HOUR = 60 * 60 * 1000;
private static final int MILLIS_IN_MINUTE = 60 * 1000;

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        Long result = null;
        if (text != null) {
            String[] time = text.split(":");
            if (time.length != 1) {
                long hours = Long.parseLong(time[0]) * MILLIS_IN_HOUR;
                long minutes = Long.parseLong(time[1]) * MILLIS_IN_MINUTE;
                result = hours + minutes;
            } else {
                result = -1L;
            }
        }
        setValue(result);
    } 
}

但请求提交时setAsText方法未调用。

---

BindingResult对象有错误：[字段'timeLeft'上的对象'item'中的字段错误：拒绝值[12:33]；代码[typeMismatch.item.timeLeft，typeMismatch.timeLeft，typeMismatch.java.lang.Long，typeMismatch]；参数[org.springframework.context.support.DefaultMessageSourceResolvable:代码[item.timeLeft，timeLeft]；参数[]；默认消息[timeLeft]]；默认消息[未能将类型为“java.lang.String”的属性值转换为属性“timeLeft”所需的类型“java.lang.Long”；嵌套异常为java.lang.NumberFormatException:对于输入字符串：“12:33”]]

long是long而不是string。在init活页夹中，您可以告诉string如何使用此编辑器。另外，您可能不想为所有字段注册它，所以您可能希望将其配置为type

long.class

和特定字段名。@M.Deinum哇！谢谢！它正在工作。非常感谢！

public class TimeleftPropertyEditor extends PropertyEditorSupport {
private static final int MILLIS_IN_HOUR = 60 * 60 * 1000;
private static final int MILLIS_IN_MINUTE = 60 * 1000;

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        Long result = null;
        if (text != null) {
            String[] time = text.split(":");
            if (time.length != 1) {
                long hours = Long.parseLong(time[0]) * MILLIS_IN_HOUR;
                long minutes = Long.parseLong(time[1]) * MILLIS_IN_MINUTE;
                result = hours + minutes;
            } else {
                result = -1L;
            }
        }
        setValue(result);
    } 
}