从 json 请求正文创建 POJO 字段时,带注释的 spring 验证有效。但是,当我手动创建相同的对象(使用设置器)并想要触发验证时,我不确定该怎么做。
这里是Registration类,里面有Builder内部类可以构建对象。在构建方法中,我想触发弹簧验证。请滚动到底部并检查 Builder.build() 和 Builder.valiate() 方法以查看当前实现。我正在使用 javax.validation.Validator 来触发验证,但如果可能的话,我更喜欢利用 spring 验证。
package com.projcore.dao;
import com.projcore.util.ToString;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.hibernate.validator.constraints.NotEmpty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.validation.ConstraintViolation;
import javax.validation.Valid;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.constraints.Size;
import java.util.List;
import java.util.Set;
/**
* The data transfer object that contains the information of a Registration
* and validation rules for attributes.
*/
@JsonIgnoreProperties(ignoreUnknown = true)
public final class Registration {
private static final Logger LOGGER = LoggerFactory.getLogger(Registration.class);
private String id;
@NotEmpty
@Size(max = 255)
private String messageId;
@NotEmpty
@Size(max = 255)
private String version;
@Size(max = 255)
private String system;
public Registration() {
}
private Registration(Builder builder) {
this.id = builder.id;
this.messageId = builder.messageId;
this.version = builder.version;
this.system = builder.system;
}
public static Builder getBuilder() {
return new Builder();
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getMessageId() {
return messageId;
}
public void setMessageId(String messageId) {
this.messageId = messageId;
}
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
public String getSystem() {
return system;
}
public void setSystem(String system) {
this.system = system;
}
@Override
public String toString() {
return ToString.create(this);
}
/**
* Builder pattern makes the object easier to construct in one line.
*/
public static class Builder {
private String id;
private String messageId;
private String version;
private String system;
private Builder() {}
public Builder id(String id) {
this.id = id;
return this;
}
public Builder messageId(String messageId) {
this.messageId = messageId;
return this;
}
public Builder version(String version) {
this.version = version;
return this;
}
public Builder system(String system) {
this.system = system;
return this;
}
public Registration build() {
Registration entry = new Registration(this);
// *** Would like to trigger spring validation here ***
Set violations = validate(entry);
if (violations.isEmpty())
return entry;
else
throw new RuntimeException(violations.toString());
}
private Set validate(Registration entry) {
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<Registration>> constraintViolations = validator.validate(entry);
return constraintViolations;
}
}
}
验证在这里工作正常:
@RequestMapping(method = RequestMethod.POST)
@ResponseStatus(HttpStatus.CREATED)
Registration create(@RequestBody @Valid Registration registration)
解决方案:
删除了 Registraion.Builder.validate()。将 Registraion.Builder.build() 更新为:
public Registration build() {
Registration entry = new Registration(this);
return (Registration) ValidatorUtil.validate(entry);
}
ValidationUtil.java
package projcore.util;
import com.ericsson.admcore.error.InvalidDataException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.beanvalidation.SpringValidatorAdapter;
import javax.validation.Validation;
import javax.validation.Validator;
import java.util.Set;
public class ValidatorUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(ValidatorUtil.class);
private static final Validator javaxValidator = Validation.buildDefaultValidatorFactory().getValidator();
private static final SpringValidatorAdapter validator = new SpringValidatorAdapter(javaxValidator);
public static Object validate(Object entry) {
Errors errors = new BeanPropertyBindingResult(entry, entry.getClass().getName());
validator.validate(entry, errors);
if (errors == null || errors.getAllErrors().isEmpty())
return entry;
else {
LOGGER.error(errors.toString());
throw new InvalidDataException(errors.getAllErrors().toString(), errors);
}
}
}
无效数据异常.java
package projcore.error;
import org.springframework.validation.Errors;
/**
* This exception is thrown when the dao has invalid data.
*/
public class InvalidDataException extends RuntimeException {
private Errors errors;
public InvalidDataException(String msg, Errors errors) {
super(msg);
setErrors(errors);
}
public Errors getErrors() {
return errors;
}
public void setErrors(Errors errors) {
this.errors = errors;
}
}
Spring 提供对 JSR-303 Bean Validation API 的全面支持。这包括对将 JSR-303 实现引导为 Spring bean 的便捷支持。这允许在应用程序中需要验证的任何地方注入 javax.validation.Validator。
使用 LocalValidatorFactoryBean 将默认的 JSR-303 验证器配置为 Spring bean:
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />
上面的基本配置将触发 JSR-303 使用其默认引导机制进行初始化。 JSR-303 提供程序,例如 Hibernate Validator,预计会出现在类路径中并将被自动检测到。
5.7.2.1 注入验证器
LocalValidatorFactoryBean implements both javax.validation.Validator and org.springframework.validation.Validator.
您可以将对这两个接口之一的引用注入到需要调用验证逻辑的 bean 中。
如果您更喜欢直接使用 JSR-303 API,请插入对
javax.validation.Validator
的引用:
// JSR-303 Validator
import javax.validation.Validator;
@Service
public class MyService {
@Autowired
private Validator validator;
}
如果您的 bean 需要 Spring Validation API,则注入对
org.springframework.validation.Validator
的引用:
// Spring Validator
import org.springframework.validation.Validator;
@Service
public class MyService {
@Autowired
private Validator validator;
}
这是一个很好解释的例子 将 JSR 303 与“经典”Spring 验证器一起使用(输入 SpringValidatorAdapter)
这个链接很有帮助。将 javax.validation.Validator 包装在 org.springframework.validation.beanvalidation.SpringValidatorAdapter 帮助始终如一地处理错误。你能把这个添加为答案吗 我可以接受
要确保它的行为类似于对 POJO(异常、消息)字段的验证,您可以使用 DataBinder
import org.springframework.validation.Validator;
@RestController
class Controller {
@Autowired
private Validator validator;
@RequestMapping(method = RequestMethod.POST)
@ResponseStatus(HttpStatus.CREATED)
Registration create() {
Registration registration = Registraction.getBuilder()....build();
DataBinder binder = new DataBinder(registration);
binder.setValidator(validator);
binder.validate();
if (binder.getBindingResult().hasErrors()) {
Method method = this.getClass().getMethod("create");
MethodParameter methodParameter = new MethodParameter(method, 0);
throw new MethodArgumentNotValidException(methodParameter, binder.getBindingResult());
}
return someService.create(registration);
}
}