Spring MVC Controller传递枚举值的实例-FinClip官网

Spring MVC Controller传递枚举值的实例

网友投稿 1002 2022-12-06

Spring MVC Controller传递枚举值的实例

目录Spring MVC Controller传递枚举值功能描述枚举定义定义Controller类请求示例结论Spring MVC 枚举传值问题最后找到解决方案

Spring MVC ContrYcXhEEYtoller传递枚举值

功能描述

本文将通过一个小示例，展示在请求参数中传递枚举值。

枚举定义

角色类定义：

public enum RoleEnum {

EMPLOYEE((short)1, "Employee"), MANAGER((short)2, "Manager");

private Short value;

private String desc;

private RoleEnum(Short value, String desc) {

this.value = value;

this.desc = desc;

}

public Short value() {

return value;

}

public String desc() {

return desc;

}

定义Controller类

@RestController

@Slf4j

public class HomeConthttp://roller {

@GetMapping("/home")

public String getDemo(@RequestParam("role") RoleEnum role) {

log.info("Role Enum:{}" + role);

return role.desc();

}

说明：在这里RoleEnum之内作为@RequestParam参数。

请求示例

Case1: http://localhost:8080/home?role=EMPLOYEE

结论：正确返回， Employee

Case2: http://localhost:8080/home?role=Employee

报错，具体信息如下：

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu May 14 11:21:32 CST 2020

There was an unexpected error (type=Bad Request, status=400).

Failed to convert value of type 'java.lang.String' to required type 'org.course.data.domain.RoleEnum'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.web.bind.annotation.RequestParam org.course.data.domain.RoleEnum] for value 'employee'; nested exception is java.lang.IllegalArgumentException: No enum constant org.course.data.domain.RoleEnum.employee

org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'org.course.data.domain.RoleEnum'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.web.bind.annotation.RequestParam org.course.data.domain.RoleEnum] for value 'employee'; nested exception is java.lang.IllegalArgumentException: No enum constant org.course.data.domain.RoleEnum.employee

at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:133)

at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:127)

at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167)

at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:798)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)