@PathVariable注解,讓spring支持參數(shù)帶值功能的案例
獲取URL動(dòng)態(tài)變量,例如
@RequestMapping('/users/{userid}') @ResponseBody public String getUser(@PathVariable String userid){ return 'userid=' + userid; }@PathVariable的包引用
spring自從3.0版本就引入了org.springframework.web.bind.annotation.PathVariable,
這是RESTful一個(gè)具有里程碑的方式,將springMVC的精華推向了高潮,那個(gè)時(shí)代,跟微信公眾號(hào)結(jié)合的開(kāi)發(fā)如火如荼,很多東西都會(huì)用到URL參數(shù)帶值的功能。
@PathVariable的PathVariable官方doc解釋- Annotation which indicates that a method parameter should be bound to a URI template variable. Supported for RequestMapping annotated handler methods in Servlet environments.
- If the method parameter is Map<String, String> or MultiValueMap<String, String> then the map is populated with all path variable names and values.
翻譯過(guò)來(lái)就是:
- 在SpringMVC中可以使用@PathVariable注解,來(lái)支持綁定URL模板參數(shù)(占位符參數(shù)/參數(shù)帶值)
- 另外如果controller的參數(shù)是Map(String, String)或者M(jìn)ultiValueMap(String, String),也會(huì)順帶把@PathVariable的參數(shù)也接收進(jìn)去
@PathVariable的RESTful示范前面講作用的時(shí)候已經(jīng)有一個(gè),現(xiàn)在再提供多一個(gè),別人訪問(wèn)的時(shí)候可以http://localhost:8080/call/窗口號(hào)-檢查編號(hào)-1
/** * 叫號(hào) */ @PutMapping('/call/{checkWicket}-{checkNum}-{status}') public ApiReturnObject call(@PathVariable('checkWicket') String checkWicket,@PathVariable('checkNum') String checkNum, @PathVariable('status') String status) { if(StringUtils.isBlank(checkWicket) || StringUtils.isBlank(checkNum)) { return ApiReturnUtil.error('叫號(hào)失敗,窗口號(hào),檢查者編號(hào)不能為空'); }else { if(StringUtils.isBlank(status)) status ='1'; try {lineService.updateCall(checkWicket,checkNum,status);return ApiReturnUtil.success('叫號(hào)成功'); } catch (Exception e) {return ApiReturnUtil.error(e.getMessage()); } } }
補(bǔ)充:解決@PathVariable接收參數(shù)帶點(diǎn)號(hào)時(shí)只截取點(diǎn)號(hào)前的數(shù)據(jù)的問(wèn)題
問(wèn)題:@RequestMapping(value = 'preview/{fileName}', method = RequestMethod.GET)public void previewFile(@PathVariable('fileName') String fileName, HttpServletRequest req, HttpServletResponse res) { officeOnlinePreviewService.previewFile(fileName, req, res);}
本來(lái)fileName參數(shù)傳的是:userinfo.docx,
但結(jié)果接收到的是:userinfo
這顯然不是我想要的。
解決方法:@RequestMapping(value = 'preview/{fileName:.+}', method = RequestMethod.GET)public void previewFile(@PathVariable('fileName') String fileName, HttpServletRequest req, HttpServletResponse res) { officeOnlinePreviewService.previewFile(fileName, req, res);}
參數(shù)fileName這樣寫,表示任何點(diǎn)(包括最后一個(gè)點(diǎn))都將被視為參數(shù)的一部分:
{fileName:.+}
以上為個(gè)人經(jīng)驗(yàn),希望能給大家一個(gè)參考,也希望大家多多支持好吧啦網(wǎng)。如有錯(cuò)誤或未考慮完全的地方,望不吝賜教。
