SpringBoot接收post请求中单个入参解决方案

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SpringBoot接收post请求中单个入参解决方案

2023-08-27 01:19| 来源: 网络整理| 查看: 265

场景：

通常会遇到写接口时仅需要传入单个参数的情况，但是spring自带的参数解析器不支持解析这种传参，导致接收到的参数始终为null。

解决方案：

1、使用JSONObject与@RequestBody注解配合接收参数；

@PostMapping("/getSingleParam") public void getSingleParam(@RequestBody JSONObject object){ System.out.println(object.getString("name")); }

2、使用Map与@RequestBody注解配合接收参数；

@PostMapping("/getSingleParam") public void getSingleParam(@RequestBody Map map){ System.out.println(map.get("name").toString()); }

3、以json字符串形式接收参数再通过JSONObject将json字符串转为对象，与方案1类似；

@PostMapping("/getSingleParam") public void getSingleParam(@RequestBody String name){ JSONObject object = JSONObject.parseObject(name); System.out.println(object.getString("name")); } 最佳解决方案：

4、模仿@RequestParam自定义@RequestSingleParam注解来解析参数，@RequestParam从请求路径获取参数，自定义注解从request body中获取参数；

第一步：自定义@RequestSingleParam注解 package com.blog.utils.aop; import org.springframework.web.bind.annotation.ValueConstants; import java.lang.annotation.*; /** * 自定义注解接收单个参数 * @author created by wutong li on 2021/04/29 */ @Target(ElementType.PARAMETER) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface RequestSingleParam { String value(); boolean required() default true; String defaultValue() default ValueConstants.DEFAULT_NONE; } 第二步：实现HandlerMethodArgumentResolver接口，配置参数解析器 package com.blog.utils.aop; import com.alibaba.fastjson.JSONObject; import org.springframework.core.MethodParameter; import org.springframework.web.bind.support.WebDataBinderFactory; import org.springframework.web.context.request.NativeWebRequest; import org.springframework.web.method.support.HandlerMethodArgumentResolver; import org.springframework.web.method.support.ModelAndViewContainer; import javax.servlet.http.HttpServletRequest; import java.io.BufferedReader; /** * RequestStringParam参数解析器实现 HandlerMethodArgumentResolver 接口 * @author created by wutong li on 2021/04/29 */ public class RequestStringParamHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver { @Override public boolean supportsParameter(MethodParameter parameter) { return parameter.hasParameterAnnotation(RequestSingleParam.class); } @Override public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception { RequestSingleParam requestSingleParam = parameter.getParameterAnnotation(RequestSingleParam.class); HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class); BufferedReader reader = request.getReader(); StringBuilder sb = new StringBuilder(); char[] buf = new char[1024]; int rd; while ((rd = reader.read(buf)) != -1) { sb.append(buf, 0, rd); } JSONObject jsonObject = JSONObject.parseObject(sb.toString()); String value = requestSingleParam.value(); return jsonObject.get(value); } } 第三步：配置WebMvcConfigurer注册自定义的参数解析器 package com.blog.config; import com.blog.utils.aop.RequestStringParamHandlerMethodArgumentResolver; import org.springframework.context.annotation.Configuration; import org.springframework.web.method.support.HandlerMethodArgumentResolver; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; import java.util.List; /** * 配置WebMvcConfigurer * @author created by wutong li on 2021/04/29 */ @Configuration public class WebMvcConfig implements WebMvcConfigurer { /** * 注册自定义的参数解析器 */ @Override public void addArgumentResolvers(List argumentResolvers){ argumentResolvers.add(new RequestStringParamHandlerMethodArgumentResolver()); WebMvcConfigurer.super.addArgumentResolvers(argumentResolvers); } } 第四步：在Controller中接收参数处加上@RequestSingleParam注解，再调一下接口就可以接收到单个的入参了 @PostMapping("/getSingleParam") public void getSingleParam(@RequestSingleParam(value = "name") String name){ System.out.println(name); }

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SpringBoot接收post请求中单个入参解决方案

SpringBoot接收post请求中单个入参解决方案

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