@Validated验证List集合的方法示例

在开发时发现，@Validated只能验证单个实体类，在验证List集合时则不生效

@PostMapping(value="/test")
public ApiResult getRepaymentPlan(@RequestBody @Validated List<Test> repaymentPlanVOs){

}

经过查资料得知，@valid是可以使用的，我们自定义一个ValidList类来替换List就可以达到验证的目的，话不多说，直接看代码

public class ValidList<E> implements List<E> {

 @Valid
 private List<E> list = new LinkedList<>();

 @Override
 public int size() {
  return list.size();
 }

 @Override
 public boolean isEmpty() {
  return list.isEmpty();
 }

 @Override
 public boolean contains(Object o) {
  return list.contains(o);
 }

 @Override
 public Iterator<E> iterator() {
  return list.iterator();
 }

 @Override
 public Object[] toArray() {
  return list.toArray();
 }

 @Override
 public <T> T[] toArray(T[] a) {
  return list.toArray(a);
 }

 @Override
 public boolean add(E e) {
  return list.add(e);
 }

 @Override
 public boolean remove(Object o) {
  return list.remove(o);
 }

 @Override
 public boolean containsAll(Collection<?> c) {
  return list.containsAll(c);
 }

 @Override
 public boolean addAll(Collection<? extends E> c) {
  return list.addAll(c);
 }

 @Override
 public boolean addAll(int index, Collection<? extends E> c) {
  return list.addAll(index, c);
 }

 @Override
 public boolean removeAll(Collection<?> c) {
  return list.removeAll(c);
 }

 @Override
 public boolean retainAll(Collection<?> c) {
  return list.retainAll(c);
 }

 @Override
 public void clear() {
  list.clear();
 }

 @Override
 public E get(int index) {
  return list.get(index);
 }

 @Override
 public E set(int index, E element) {
  return list.set(index, element);
 }

 @Override
 public void add(int index, E element) {
  list.add(index, element);
 }

 @Override
 public E remove(int index) {
  return list.remove(index);
 }

 @Override
 public int indexOf(Object o) {
  return list.indexOf(o);
 }

 @Override
 public int lastIndexOf(Object o) {
  return list.lastIndexOf(o);
 }

 @Override
 public ListIterator<E> listIterator() {
  return list.listIterator();
 }

 @Override
 public ListIterator<E> listIterator(int index) {
  return list.listIterator(index);
 }

 @Override
 public List<E> subList(int fromIndex, int toIndex) {
  return list.subList(fromIndex, toIndex);
 }

public List<E> getList() {
 return list;
}

public void setList(List<E> list) {
 this.list = list;
}

}

然后用ValidList类替换我们的List即可

@PostMapping(value="/test")
public ApiResult getRepaymentPlan(@RequestBody @Validated ValidList<Test> repaymentPlanVOs){

}

补充，将@Validated返回的异常替换为我们自定义的json格式并返回，只需在当前controller类里注入一个异常bean，并用@ExceptionHandler来捕获对应的异常即可。MethodArgumentNotValidException为@Validated返回的异常，这里只需要捕获对应异常即可

@ExceptionHandler(value = MethodArgumentNotValidException.class)
 @ResponseBody
 public Map<String,Object> allExceptionHandler(MethodArgumentNotValidException e){
    Map<String,Object> result = new HashMap<String,Object>();
 MethodArgumentNotValidException ex = (MethodArgumentNotValidException)e;
 BindingResult bindingResult = ex.getBindingResult();
 StringBuilder errMsg = new StringBuilder(bindingResult.getFieldErrors().size() * 16);
 errMsg.append("Invalid request:");
 for (int i = 0 ; i < bindingResult.getFieldErrors().size() ; i++) {
  if(i > 0) {
  errMsg.append(",");
  }
  FieldError error = bindingResult.getFieldErrors().get(i);
  errMsg.append(error.getField()+":"+error.getDefaultMessage());
 }
    result.put("res_code","400");
    result.put("res_mess",errMsg.toString());
 return result;
 }

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