在多条件查询的表格场景中，因为需要传递的参数较多，@RequestParam需要更多的代码量，所以我个人采用@RequestBody的方式传递
Controller中:
@ResponseBody
@PostMapping("/users")
public Page<User> findAll(@RequestBody QueryParams queryParams) {
return userService.findAll(queryParams);;
}
实体类:
public class QueryParams {
private int pageSize = 0;
private int pageNumber = 15;
private String searchText = "";
private String sortName = "date";
private String sortOrder = "desc";
private List<Condition> conditions = Collections.emptyList();
// get set 方法省略...
}
// 多重条件选择对象
public class Condition {
private String field;
private String comparison;
private String input;
// get set 方法省略...
}
但访问该请求时，有可能会出现这样的错误:
com.fasterxml.jackson.databind.exc.InvalidDefinitionException:
Cannot construct instance of `com.xxx.domain.QueryParams`
(no Creators, like default construct, exist):
cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (PushbackInputStream); line: 1, column: 2]
遇到这种情况，请把使用@RequestBody的实体类的全部构造参数删除，包括其嵌套的实体类(QueryParams 类中嵌套的 Condition)。
删除之后，运行正常。
