使用@RequestParam 时不支持请求方法“POST”

Question

我正在使用 Spring MVC。 并收到此错误：不支持请求方法“POST”

爪哇

@RequestMapping(value = "/jdbcInsertGuest", method = RequestMethod.POST)
public void jdbcInsertGuest(@RequestParam(value = "guestName") String guestName, @RequestParam(value="comment") String comment) {
       Guest guest = new Guest();
       guest.setGuestName(guestName);
       guest.setComment(comment);
       jdbcExample.insertGuest(guest);
}

JSP

<form name="jdbcInsertGuest" method="POST">
        <table>
            <tr>
                <td><b>Name: </b></td>
                <td><input type='text' name='guestName'/></td>
            </tr>
            <tr>
                <td><b>Comment: </b></td>
                <td><input type='text' name="comment"/></td>
            </tr>
        </table>

        <button>Send</button>
</form>

当我将方法更改为 GET 时，出现此错误： Required String parameter 'guestName' is not present 。

如何解决这个问题？

Answer 1

我认为你应该在你的 jsp 中添加 "action="/jdbcInsertGuest" "

<form name="jdbcInsertGuest" action="/jdbcInsertGuest" method="POST">
    <table>
        <tr>
            <td><b>Name: </b></td>
            <td><input type='text' name='guestName'/></td>
        </tr>
        <tr>
            <td><b>Comment: </b></td>
            <td><input type='text' name="comment"/></td>
        </tr>
    </table>

    <button>Send</button>

Answer 2

进行以下更改，

1. 将action="/URL"属性添加到表单中，此属性将表单事件与 spring mvc 控制器中的相关方法映射
2. 将表单name (jdbcInsertGuest) 更改为 guest，此数据模型传递给 post 方法
3. 使用@ModelAttribute ，此注解将表单数据与相关模型绑定

网页,

<form name="guest" action="/jdbcInsertGuest" method="POST">
    <table>
        <tr>
            <td><b>Name: </b></td>
            <td><input type='text' name='guestName'/></td>
        </tr>
        <tr>
            <td><b>Comment: </b></td>
            <td><input type='text' name="comment"/></td>
        </tr>
    </table>

    <button>Send</button>

MVC控制器，

@RequestMapping(value = "/jdbcInsertGuest", method = RequestMethod.POST)
public void jdbcInsertGuest(@ModelAttribute("guest") Guest guest) {
    jdbcExample.insertGuest(guest);
}

POJO（来宾.java），

public class Guest {

    private String guestName;
    private String comment;

    public String getGuestName() {
        return guestName;
    }
    public void setGuestName(String guestName) {
        this.guestName = guestName;
    }
    public String getComment() {
        return comment;
    }
    public void setComment(String comment) {
        this.comment = comment;
    }
}

谢谢，