post请求在spring引导和angularjs之间的错误请求

Question

我有两个小项目，后端spring-boot端负责提供数据，angularjs前端部分只是显示数据。我试图张贴一个json从角度和弹簧引导侧消耗和发送一个回应。

这是json中的赛马数据；"jokey“是指骑手，并包含骑手信息：

var list = {"horses":  [{"horseId":45942,"horseName":"Decolte","raceId":8449,"kilo":61.0,"jokey":{"name":"AYETULLAH DEMİR","raceNumber":41,"first":1,"second":4,"third":0,"fourth":1},"ekuriId":0},
                        {"horseId":27520,"horseName":"Busıness Man","raceId":8449,"kilo":57.0,"jokey":{"name":"CİVAN ÖZŞAHİN","raceNumber":190,"first":7,"second":15,"third":18,"fourth":12},"ekuriId":0},
                        {"horseId":55856,"horseName":"Erselçuk","raceId":8449,"kilo":57.0,"jokey":{"name":"NAİL EREN","raceNumber":64,"first":2,"second":0,"third":4,"fourth":2},"ekuriId":0},
                        {"horseId":52940,"horseName":"Haşim Ağa","raceId":8449,"kilo":57.0,"jokey":{"name":"DOĞUKAN AYDOĞAN","raceNumber":380,"first":11,"second":18,"third":10,"fourth":24},"ekuriId":0},
                        {"horseId":53431,"horseName":"İhtiyar","raceId":8449,"kilo":57.0,"jokey":{"name":"CÜNEYİT GÖKÇE","raceNumber":598,"first":32,"second":52,"third":64,"fourth":65},"ekuriId":0},
                        {"horseId":51778,"horseName":"Urla Zamanı","raceId":8449,"kilo":57.0,"jokey":{"name":"ADEM ŞEN","raceNumber":280,"first":18,"second":25,"third":32,"fourth":32},"ekuriId":0},
                        {"horseId":51816,"horseName":"Wın Every Day","raceId":8449,"kilo":57.0,"jokey":{"name":"EMRE NALBANT","raceNumber":405,"first":19,"second":26,"third":36,"fourth":33},"ekuriId":0},
                        {"horseId":58650,"horseName":"Lıon Amed","raceId":8449,"kilo":52.0,"jokey":{"name":"CANER KARADEMİR","raceNumber":134,"first":7,"second":7,"third":8,"fourth":7},"ekuriId":0},
                        {"horseId":51239,"horseName":"Catch The Wınd","raceId":8449,"kilo":57.0,"jokey":{"name":"MÜSLÜM CANPOLAT","raceNumber":238,"first":5,"second":12,"third":12,"fourth":19},"ekuriId":0},
                        {"horseId":46263,"horseName":"Ian Tapp","raceId":8449,"kilo":58.0,"jokey":{"name":"ERDEM NUR TÜFEKÇİ","raceNumber":79,"first":3,"second":1,"third":4,"fourth":5},"ekuriId":0},
                        {"horseId":51647,"horseName":"Sılverado","raceId":8449,"kilo":57.0,"jokey":{"name":"ÜMİT DERYA ALTEKİN","raceNumber":1185,"first":48,"second":53,"third":64,"fourth":84},"ekuriId":0},
                        {"horseId":57231,"horseName":"Junıor Duru","raceId":8449,"kilo":58.0,"jokey":{"name":"BEDRİ TEPE","raceNumber":716,"first":45,"second":55,"third":50,"fourth":67},"ekuriId":0}
                       ]};

它基本上是一个数组，但是堆栈溢出上的人告诉ajax请求中的数据应该是一个对象，所以我在前面添加了“array：”。在代码中手动添加json。

这是http请求：

$http({
    url: 'http://localhost:8080/horseHistory',
    method: 'POST',
    contentType: "application/json",
    data: list.horses,
    headers: {
        "Content-Type": "application/json"
    }
}).success(function(data) {
    console.log(data);
});

在后端，我只想看到一个正在工作的http连接，所以它大部分是空的。这是spring启动函数：

@RequestMapping(value = "/horseHistory", method = RequestMethod.POST )
public ResponseEntity<Void> getHorseHistory(@RequestBody HorseRaceModel[] horseRaces) throws IOException {

    System.out.println(horseRaces[0]);

    return null;
}

HorseRaceModel：

package ganyan;

public class HorseRaceModel {
int horseId;
String horseName;
int raceId;
double kilo;
JokeyModel jokey;
int ekuriId;

public HorseRaceModel(int horseId, String horseName, int raceId, double kilo, JokeyModel jokey, int ekuriId) {
    this.horseId = horseId;
    this.horseName = horseName;
    this.raceId = raceId;
    this.kilo = kilo;
    this.jokey = jokey;
    this.ekuriId = ekuriId;
}

public int getHorseId() {
    return horseId;
}

public void setHorseId(int horseId) {
    this.horseId = horseId;
}

public void setHorseName(String horseName) {
    this.horseName = horseName;
}

public String getHorseName() {
    return horseName;
}

public int getRaceId() {
    return raceId;
}

public void setRaceId(int raceId) {
    this.raceId = raceId;
}

public double getKilo() {
    return kilo;
}

public void setKilo(double kilo) {
    this.kilo = kilo;
}

public JokeyModel getJokey() {
    return jokey;
}

public void setJokey(JokeyModel jokey) {
    this.jokey = jokey;
}

public int getEkuriId() {
    return ekuriId;
}

public void setEkuriId(int ekuriId) {
    this.ekuriId = ekuriId;
}

}

JokeyModel：

public class JokeyModel {

private String name;
private int raceNumber;
private int first;
private int second;
private int third;
private int fourth;

public int getSecond() {
    return second;
}

public void setSecond(int second) {
    this.second = second;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getRaceNumber() {
    return raceNumber;
}

public void setRaceNumber(int raceNumber) {
    this.raceNumber = raceNumber;
}

public int getFirst() {
    return first;
}

public void setFirst(int first) {
    this.first = first;
}

public int getThird() {
    return third;
}

public void setThird(int third) {
    this.third = third;
}

public int getFourth() {
    return fourth;
}

public void setFourth(int fourth) {
    this.fourth = fourth;
}

}

来自Chrome控制台的错误：

Failed to load resource: the server responded with a status of 400 (Bad Request) http://localhost:8080/horseHistory

来自Java控制台的错误：

nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.HashMap out of START_ARRAY token

Answer 1

我不熟悉Spring，也不知道为什么有人告诉您发布一个JSON对象，而不是JSON数组，但我看到您没有连贯一致地这样做。

您将JSON数组封装在一个名为list的JSON对象中，但是通过指定data: list.horses，仍然只传递嵌入的JSON数组。因为您希望发送整个JSON对象，所以应该指定data: list。

此外，我认为您需要在服务器端定义包装器模型，这可能是如下所示的类：

public class ListModel {
    private List<HorseRaceModel> horses;

    public List<HorseRaceModel> getHorses() {
            return horses;
    }

    public void setHorses(List<HorseRaceModel> horses) {
        this.horses = horses;
    }
}

最后，应该指示使用post的方法将请求体解析为ListModel。这意味着将方法修改为如下所示：

@RequestMapping(value = "/horseHistory", method = RequestMethod.POST )
public ResponseEntity<Void> getHorseHistory(@RequestBody ListModel horseRaces) throws IOException {

    System.out.println(horseRaces.getHorses().get(0).getName());

    return null;
}

侧记：我还修改了代码，以打印第一个马的名称，而不是由System.out.println(horseRaces.getHorses().get(0));打印的对象指针。你可能想印些别的东西。您还可能希望为包装器对象和模型使用更好的名称(而不是list和ListModel)。

注释中的注释：您的HorseRaceModel类没有空构造函数，您需要提供一个反序列化才能工作