@RequestBody JSON 400错误 解决 办法
在进行Web开发时，常常使用RESTful API来处理数据请求。而当使用@RequestBody 注解将请求的JSON数据直接绑定到Java对象时，有时会遇到HTTP 400错误 。
常见的原因有以下几种：
1. 请求的JSON格式不正确
{
"name": "John Doe","age": 25,"gender": false
}
2. 请求的JSON数据与Java对象不匹配
public class User {
private String name;
private Integer age;
private String gender;
// getters and setters
}
@RequestMapping(value = "/user",method = RequestMethod.POST)
public ResponseEntity saveUser(@RequestBody User user) {
// do something
}
3. 请求头Content-Type不正确
headers: {
'Content-Type': 'application/json'
}
解决 办法：
1. 根据请求的JSON格式修改 请求体；
2. 根据请求的JSON数据修改 Java对象；
3. 确认请求头Content-Type为application/json。
参考代码 ：
@RequestMapping(value = "/user",method = RequestMethod.POST)
public ResponseEntity saveUser(@RequestBody User user) {
// do something
return ResponseEntity.ok().build();
}
@ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
@Override
protected ResponseEntity handleHttpMessageNotReadable(HttpMessageNotReadableException ex,HttpHeaders headers,HttpStatus status,WebRequest request) {
String error = "Malformed JSON request";
return buildr esponseEntity(new ApiError(HttpStatus.BAD_REQUEST,error,ex));
}
private ResponseEntity buildr esponseEntity(ApiError apiError) {
return new ResponseEntity(apiError,apiError.getStatus());
}
@ExceptionHandler(MethodArgumentTypeMismatchException.class)
protected ResponseEntity handleMethodArgumentTypeMismatch(MethodArgumentTypeMismatchException ex,WebRequest request) {
String error = "Method argument type mismatch";
return buildr esponseEntity(new ApiError(HttpStatus.BAD_REQUEST,ex));
}
@ExceptionHandler(MethodArgumentNotValidException.class)
protected ResponseEntity handleMethodArgumentNotValid(MethodArgumentNotValidException ex) {
String error = "Method argument not valid";
return buildr esponseEntity(new ApiError(HttpStatus.BAD_REQUEST,ex));
}
}
public class ApiError {
private HttpStatus status;
private String message;
private List errors;
public ApiError(HttpStatus status,String message,Throwable ex) {
this.status = status;
this.message = message;
this.errors = Arrays.asList(ex.getMessage());
}
public HttpStatus getStatus() {
return status;
}
public String getMessage() {
return message;
}
public List getErrors() {
return errors;
}
}
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