所以,我有我的spring boot控制器和ajax函数来获取响应数据,在ajax成功获得响应之后,数据是未定义的,但是HTTP状态是204,这很好,但是为什么数据是未定义的,如何在ajax中获取它来访问我想要获取的对象中的属性?

我的控制器

@DeleteMapping(value = "/**/delete/{id}")
public ResponseEntity<?> delete(@PathVariable Integer id) {
    Optional<Offer> optional = this.offerRepository.findById(id);
    if (optional.isPresent()) {
        this.offerRepository.deleteById(id);
        HttpHeaders responseHeaders = new HttpHeaders();
        responseHeaders.setContentType(MediaType.APPLICATION_JSON_UTF8);
        Offer offer = optional.get();
        return new ResponseEntity<Offer>(offer, responseHeaders, HttpStatus.NO_CONTENT);
    } else {
        HttpHeaders responseHeaders = new HttpHeaders();
        responseHeaders.setContentType(MediaType.TEXT_HTML);
        String msg = "Offer is not found";
        return new ResponseEntity<String>(msg, responseHeaders, HttpStatus.NOT_FOUND);
    }
}

我的阿贾克斯

$.ajax({
    url: "/" + currentUserRoleName + '/delete' + "/" + offerIdValue,
    scriptCharset: 'UTF-8',
    method: 'DELETE',
    success: function (data, textStatus, jqXHR) {
        console.log(data); // get undefine
        console.log(jqXHR.status); //status is 204
        var offer = $.parseJSON(data.responseText); //here error call of undefine
        if (jqXHR.status === 204 || jqXHR.status === 200) {
            // var id = offer.id;
            var selector = "input#offerHiddenId[value =  '" + offerIdValue + " ']";
            var hiddenInputWithOfferId = $(".main_out_wrapper_user_offers").css(selector);
            var parent = hiddenInputWithOfferId.closest("div.inner_main_out_wrapper_user_offers");
            parent.empty();
            $("#no").click();
        } else {
            alert("Can't delete the offer");
        }
    },
    error: function (data) {
        alert(data.responseText);
        var div = $.createElement("div");
        var span = $.createElement("span");
        span.innerHTML = "Offer is not found";
        div.appendChild(span);
        div.fadeIn(1000, function () {
            div.fadeOut(1000);
        });
    }
});

Librery for spring boot将pom.xml中的对象转换为JSON格式

<properties>
    <jaction.xml.version>2.9.6</jaction.xml.version>
</properties>

    <!--FOR JSON-->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>${jaction.xml.version}</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${jaction.xml.version}</version>
    </dependency>

我试图从数据库中删除报价,我从我的页面发送了请求,报价也从数据库中删除了,但是响应不太好,当我发送新的响应(msg,responseHeaders,HttpStatus.not_FOUND)时,我仍然在ajax函数中获得未定义的数据。

我想在ajax中获取JSON格式的Offer对象,以便从Offer对象访问id。