定制大小注释上的Java验证消息

Question

public class ExecutionStepOption extends AbstractDomainObject implements Nameable {

private static final long serialVersionUID = 4249454967446069549L;

@NotNull
@Size(min = 1, max = 100)
@Column(name = "name")
private String name;

@NotNull
@Size(min = 1, max = 10)
@Column(name = "value")
private String value;

在HTML方面，我有一个表单，它有两个textbox，这两个textbox包含名称和值。当用户输入一个大于10个字符大小的值时，我想显示一个类似“值大于10个字符”的定制消息。

我试过这个

@NotNull
@Size(min = 1, max = 10, message = "Size cannot be greater than 10 Characters")
@Column(name = "value")
private String value;

但似乎不起作用。我仍然会收到丑陋的Java消息

Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction

javax.validation.ConstraintViolationException: Validation failed for classes [org.misoenergy.darr.domain.ExecutionStepOption] during persist time for groups [javax.validation.groups.Default, ]

Answer 1

如果您使用的是spring mvc，那么您可以保留您正在做的事情，并添加一个ContollerAdvise，如下所示：

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;

import javax.validation.ConstraintViolationException;

@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {

    @ExceptionHandler(value = { ConstraintViolationException.class})
    protected ResponseEntity<Object> handleNotAuthenticated(RuntimeException ex, WebRequest request) {

        // String message =  extract violation message from exception

        return handleExceptionInternal(ex, message, 
          new HttpHeaders(), HttpStatus.NOT_ACCEPTABLE, request);
    }

}

添加逻辑以从异常中提取您的消息，并将HttpStatus更改为您喜欢的。该消息将在您的响应正文中返回。

如果可以将约束设置在DTO上，则可以在控制器中使用@valid注释，如下所示：

@RequestMapping(value = "/stepoption", method = RequestMethod.POST)
public String setOption(@Valid ExecutionStepOption  stepoption) {

        return "whatever";

}