jquery - Jackson 无法读取文档 : Unrecognized token 'contactForm' : was expecting ('true' , 'false' 或 'null' )

Question

我想使用 JQuery 向 Spring Controller 发送 POST 请求，但我不断从 jquery 收到此错误

Could not read document: Unrecognized token 'contactForm': was expecting ('true', 'false' or 'null')
 at [Source: java.io.PushbackInputStream@38220bcd; line: 1, column: 13]; nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'contactForm': was expecting ('true', 'false' or 'null')
 at [Source: java.io.PushbackInputStream@38220bcd; line: 1, column: 13]

这是 POST 请求

$('#contactForm').on('submit', function(e){
        e.preventDefault();
        var contactForm = new Object;
        var firstName = $('#firstName').val();
        var lastName = $('#lastName').val();
        var email = $('#email').val();
        var message = $('#message').val();
        contactForm.firstName = firstName;
        contactForm.lastName = lastName;
        contactForm.email = email;
        contactForm.message = message;
        contactForm.accepted = true;
        console.log(JSON.stringify(contactForm));
        $.ajax({
            type: 'POST',
            url: '/checkContact.json',
            contentType : 'application/json; charset=utf-8',
            dataType: 'json',
            data: {
                contactForm: JSON.stringify(contactForm)

            },
            success: function(response){
                console.log(response)
                $('#success').text(response.message);
            },
            error: function(data){
                console.log(data.responseJSON.message);
            }
        })
    })

这是 Controller

 @PostMapping("/checkContact.json")
       public @ResponseBody String sendContactForm(@Valid @RequestBody ContactForm contactForm, BindingResult result, HttpServletRequest request) throws MalformedURLException, JsonProcessingException{

//logic here

}

和联系表格

public class ContactForm {

    @NotNull
    @NotEmpty
    @ValidEmail
    private String email;

    @NotNull
    @NotEmpty
    private String firstName;

    @NotNull
    @NotEmpty
    private String lastName;

    @NotNull
    @NotEmpty
    private String message;

//  @AssertTrue
    private boolean accepted;

//getters and setters
}

我不知道到底发生了什么，因为例如，如果我尝试使用带有此正文的 POSTMAN 向 Controller 发送 JSON，这与 JSON.stringify(contactForm)，一切都很顺利，所以 jackson 在幕后做了一些奇怪的事情......

{
    "fistName": "John",
    "lastName": "Smith",
    "email": "a@a.aa",
    "message": "Hello"
    "accepted":true
}

Answer 1

在您的 jQuery ajax 调用中调整您的数据值:

    $.ajax({
        type: 'POST',
        url: '/checkContact.json',
        contentType : 'application/json; charset=utf-8',
        dataType: 'json',
        data: JSON.stringify(contactForm),
        success: function(response){
            console.log(response)
            $('#success').text(response.message);
        },
        error: function(data){
            console.log(data.responseJSON.message);
        }
    })

发生的事情是 jQuery 正在将您的对象转换为查询参数字符串并发送它。这看起来像:

contactForm=%7B%22fistName%22%3A%22John%22%2C%...

Jackson 尝试将查询参数解释为失败的请求正文。

这可以通过查看浏览器中的网络选项卡并查看请求正文来确认