@PathVariable @RequestParam 和 @RequestBody 的区别

最新推荐文章于 2025-04-14 09:47:32 发布

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最新推荐文章于 2025-04-14 09:47:32 发布

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文章标签： java

本文链接：https://blog.youkuaiyun.com/weixin_44905182/article/details/104917988

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本文详细解析了在Spring MVC框架中使用@PathVariable、@RequestParam和@RequestBody注解的方法，介绍了如何通过这些注解来处理RESTful API的不同类型参数，包括路径参数、查询字符串参数和POST请求体参数。

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1.@PathVariable

@PathVariable注解用于获取restfull 风格的url参数，例如：

@RequestMapping(value = "/query/queryOneLetter/{lettercode}" , method = RequestMethod.GET)
public JsonResult queryOneLetter(@PathVariable(value="lettercode") String lettercode, HttpServletRequest request) {
	SabBConfirmletterVo vo = confirmletterService.queryOneLetter(lettercode);
	return new JsonResult(vo);
}

但是当方法参数名称和url中参数名称不相同时，需要添加value属性，例如：

@RequestMapping(value = "/query/queryOneLetter/{code}" , method = RequestMethod.GET)
public JsonResult queryOneLetter(@PathVariable(value="code") String lettercode, HttpServletRequest request) {
	SabBConfirmletterVo vo = confirmletterService.queryOneLetter(lettercode);
	return new JsonResult(vo);
}

参数有多个时同样适用，例如：

@RequestMapping(value = "/query/queryOneLetter/{id}/{code}" , method = RequestMethod.GET)
public JsonResult queryOneLetter(@PathVariable Integer id,@PathVariable(value="code") String lettercode, HttpServletRequest request) {
	SabBConfirmletterVo vo = confirmletterService.queryOneLetter(id,lettercode);
	return new JsonResult(vo);
}

2.@RequestParam

@RequestParam适用于“/query/queryOneLetter?lettercode=1024”这用类型的url，例如：

@RequestMapping(value = "/query/queryOneLetter" , method = RequestMethod.GET)
public JsonResult queryOneLetter(@RequestParam String lettercode, HttpServletRequest request) {
	SabBConfirmletterVo vo = confirmletterService.queryOneLetter(lettercode);
	return new JsonResult(vo);
}

但是当方法参数名称和url中参数名称不相同时，需要添加value属性，“/query/queryOneLetter?code=1024”例如：

@RequestMapping(value = "/query/queryOneLetter" , method = RequestMethod.GET)
public JsonResult queryOneLetter(@RequestParam(value="code", required=true) String lettercode, HttpServletRequest request) {
	SabBConfirmletterVo vo = confirmletterService.queryOneLetter(lettercode);
	return new JsonResult(vo);
}

注：required=true 表示该参数必须传，否则会404

参数为多个时，“/query/queryOneLetter?id=1024&code=1024”，例如：

@RequestMapping(value = "/query/queryOneLetter" , method = RequestMethod.GET)
public JsonResult queryOneLetter(@RequestParam Integer id, @RequestParam(value="code", required=true) String lettercode, HttpServletRequest request) {
	SabBConfirmletterVo vo = confirmletterService.queryOneLetter(lettercode);
	return new JsonResult(vo);
}

如果用实体对象接收参数，不用写该注解，例如：

@RequestMapping(value = "/query/queryAllLetter" , method = RequestMethod.GET)
public JsonResult queryAllLetter(SabBConfirmletterVo vo, HttpServletRequest request) {
	ResultPage<SabBConfirmletterVo> vos = confirmletterService.queryAllLetter(vo);
	return new JsonResult(vos);
}

3.@RequestBody

@RequestBody，用于接收post请求中的实体参数，例如：

@RequestMapping(value = "/modify/modifyOneLetter" , method = RequestMethod.POST)
public JsonResult modifyOneLetter(@RequestBody SabBConfirmletterVo vo, HttpServletRequest request) {
	String result = confirmletterService.modifyOneLetter(vo);
	return new JsonResult(result);
}