当从json请求体创建时，POJO字段上带注释的弹簧验证有效。但是，当我手动创建相同的对象（使用setter）并想要触发验证时，我不知道该怎么做。
这是Registration类，它具有可以构建对象的Builder内部类。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。我使用javax.validation.Validator来触发验证，但如果可能的话，我更愿意使用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);
}
}
}
InvalidDataException.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;
}
}
答案 0 :(得分：18)
Spring完全支持JSR-303 Bean Validation API。这包括方便地支持将JSR-303实现引导为Spring bean。这允许在应用程序中需要验证的地方注入javax.validation.Validator。
使用LocalValidatorFactoryBean将默认的JSR-303 Validator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（如Hibernate Validator）应该出现在类路径中并自动检测。
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。
如果您希望直接使用JSR-303 API，请注入对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，则引用对org.springframework.validation.Validator的引用：
// Spring Validator
import org.springframework.validation.Validator;
@Service
public class MyService {
@Autowired
private Validator validator;
}
这是一个很好的例子 Using JSR 303 with "classic" Spring Validators (enter the SpringValidatorAdapter)
此链接非常有用。包装javax.validation.Validator org.springframework.validation.beanvalidation.SpringValidatorAdapter 帮助一致地处理错误。你可以添加这个作为答案吗？ 我可以接受它