javascript - ajax post 调用在将数组发送到 Spring Rest Controller 时导致 400(错误请求)

Question

我有 OneToMany 映射为

@Entity
public class Foo implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long fooId;
    private String fooName;     

    @OneToMany(mappedBy = "foo", cascade = CascadeType.ALL)
    private Set<Bar> bars = new HashSet<Bar>();

    // getters and setters go here
}

和

@Entity
public class Bar implements Serializable {     
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long barId;
    private String barTitle;
    private static final long serialVersionUID = 1L;
    @ManyToOne
    @JoinColumn(name = "fooId")
    private Foo foo;
    // getters and setters go here
}

我创建了一个 FooRestController 来使用 ajax 保存数据

@RequestMapping(value = "/foo/", headers="Accept=*/*", consumes="application/json", method = RequestMethod.POST)
    public ResponseEntity<Void> create(@RequestBody Foo foo) {           
        fooService.saveFoo(foo);
        Set<Bar> bars = foo.getBars();      

        for (Bar bar : bars) {
            barService.savebar(bar);            
        }       

        return new ResponseEntity<Void>(HttpStatus.CREATED);
    }

我的ajax POST请求是

var barArray = [];
bar[0] = "Bar1";
bar[1] = "Bar2";
$.ajax({
    contentType : 'application/json',
    crossDomain: true,
    type: 'POST',
    url: '/foo/',
    dataType : 'json',
    data : JSON.stringify({        
        'fooName' : 'A',
        'bars' : barArray // this line here causes error 
})

此时我收到错误

POST http://localhost:8080/name/foo/ 400 (Bad Request)

关于保存 foo 的 barArray 的任何建议。

注意

每当我使用 Postman 发送数据时

{

    "fooName": "A",       
   "bars" : [
         {
            "barTitle" : "a"                
         }           
       ]
}

插入数据并在数据库中创建一个新的 foo。

Answer 1

就我的方法而言，问题很明显，您应该在 Postman 中发送 barArray 时发送它，所以编写此代码

var barArray = [];
bar[0] = "Bar1";
bar[1] = "Bar2";
$.ajax({
    contentType : 'application/json',
    crossDomain: true,
    type: 'POST',
    url: '/foo/',
    dataType : 'json',
    data : JSON.stringify({        
        'fooName' : 'A',
        'bars' : [{
                 "barTitle" : bar[0], 
               },{
                 "barTitle" : bar[1], 
               }]
})

并在休息 Controller 中进行一些更改，以便以这种方式将 fooId 保存在 Bar 实体中

@RequestMapping(value = "/foo/", headers="Accept=*/*", consumes="application/json", method = RequestMethod.POST)
    public ResponseEntity<Void> create(@RequestBody Foo foo) {           
        fooService.saveFoo(foo);
        Set<Bar> bars = foo.getBars();      

        for (Bar bar : bars) {
            bar.setFoo(foo); // this foo object comes from method arg @RequestBody Foo foo above
            barService.savebar(bar);            
        }       

        return new ResponseEntity<Void>(HttpStatus.CREATED);
    }

尝试一下，希望现在您不会看到 400 错误。