这是我在 spring-boot 2.0.3 中的工作方式：
我必须在 spring-boot 中覆盖和禁用 ValidationAutoConfiguration：
import org.springframework.boot.validation.MessageInterpolatorFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Lazy;
import org.springframework.core.env.Environment;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.validation.beanvalidation.MethodValidationPostProcessor;
import javax.validation.Validator;
@Configuration
public class ValidationConfiguration {
public ValidationConfiguration() {
}
@Bean
public static LocalValidatorFactoryBean validator() {
LocalValidatorFactoryBean factoryBean = new LocalValidatorFactoryBean();
factoryBean.setParameterNameDiscoverer(new CustomParamNamesDiscoverer());
MessageInterpolatorFactory interpolatorFactory = new MessageInterpolatorFactory();
factoryBean.setMessageInterpolator(interpolatorFactory.getObject());
return factoryBean;
}
@Bean
public static MethodValidationPostProcessor methodValidationPostProcessor(Environment environment, @Lazy Validator validator) {
MethodValidationPostProcessor processor = new MethodValidationPostProcessor();
boolean proxyTargetClass = (Boolean) environment.getProperty("spring.aop.proxy-target-class", Boolean.class, true);
processor.setProxyTargetClass(proxyTargetClass);
processor.setValidator(validator);
return processor;
}
}
CustomParamNamesDiscoverer 位于同一个包中，它几乎是 DefaultParameterNameDiscoverer 的复制粘贴，spring-boot 的参数名称发现器的默认实现：
import org.springframework.core.*;
import org.springframework.util.ClassUtils;
public class CustomParameterNameDiscoverer extends PrioritizedParameterNameDiscoverer {
private static final boolean kotlinPresent = ClassUtils.isPresent("kotlin.Unit", CustomParameterNameDiscoverer.class.getClassLoader());
public CustomParameterNameDiscoverer() {
if (kotlinPresent) {
this.addDiscoverer(new KotlinReflectionParameterNameDiscoverer());
}
this.addDiscoverer(new ReqParamNamesDiscoverer());
this.addDiscoverer(new StandardReflectionParameterNameDiscoverer());
this.addDiscoverer(new LocalVariableTableParameterNameDiscoverer());
}
}
我希望它保持几乎完整（你甚至可以看到那里的 kotlin 检查），唯一的补充是：
我正在将ReqParamNamesDiscoverer 的实例添加到发现者的链接列表中。请注意，添加顺序在这里很重要。
这里是源代码：
import com.google.common.base.Strings;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.lang.Nullable;
import org.springframework.web.bind.annotation.RequestParam;
import java.lang.reflect.Constructor;
import java.lang.reflect.Executable;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
public class ReqParamNamesDiscoverer implements ParameterNameDiscoverer {
public ReqParamNamesDiscoverer() {
}
@Override
@Nullable
public String[] getParameterNames(Method method) {
return doGetParameterNames(method);
}
@Override
@Nullable
public String[] getParameterNames(Constructor<?> constructor) {
return doGetParameterNames(constructor);
}
@Nullable
private static String[] doGetParameterNames(Executable executable) {
Parameter[] parameters = executable.getParameters();
String[] parameterNames = new String[parameters.length];
for (int i = 0; i < parameters.length; ++i) {
Parameter param = parameters[i];
if (!param.isNamePresent()) {
return null;
}
String paramName = param.getName();
if (param.isAnnotationPresent(RequestParam.class)) {
RequestParam requestParamAnnotation = param.getAnnotation(RequestParam.class);
if (!Strings.isNullOrEmpty(requestParamAnnotation.value())) {
paramName = requestParamAnnotation.value();
}
}
parameterNames[i] = paramName;
}
return parameterNames;
}
}
如果参数带有RequestParam 注释，我将检索value 属性并将其作为参数名称返回。
接下来的事情是禁用自动验证配置，不知何故，没有它就无法工作。这个注释虽然可以解决问题：
@SpringBootApplication(exclude = {ValidationAutoConfiguration.class})
此外，您需要为您的 ConstraintValidationException 提供一个自定义处理程序：
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(ConstraintViolationException.class)
public ErrorDTO handleConstraintViolationException(ConstraintViolationException ex) {
Map<String, Collection<String>> errors = new LinkedHashMap<>();
ex.getConstraintViolations().forEach(constraintViolation -> {
String queryParamPath = constraintViolation.getPropertyPath().toString();
log.debug("queryParamPath = {}", queryParamPath);
String queryParam = queryParamPath.contains(".") ?
queryParamPath.substring(queryParamPath.indexOf(".") + 1) :
queryParamPath;
String errorMessage = constraintViolation.getMessage();
Collection<String> perQueryParamErrors = errors.getOrDefault(queryParam, new ArrayList<>());
perQueryParamErrors.add(errorMessage);
errors.put(queryParam, perQueryParamErrors);
});
return validationException(new ValidationException("queryParameter", errors));
}