springboot快速入门-4.常用取参数方法

POST

POST提交JSON

	@PostMapping(value = "/agreeRefund")
    public Result agreeRefund(@RequestBody Map map){
        Object headId = map.get("headId");
        if(CheckUtils.isEmpty(headId)){
            return Result.error("参数错误");
        }
        return signService.agreeRefund(headId.toString());
    }

POST提交JSON

JSON对象必须和实体类对象一致，这样可以自动转为实体类对象

	@PostMapping("/saveAndSign")
    public Result saveAndSign(@RequestBody NyjOrderHead nyjOrderHead){
        if(CheckUtils.isEmpty(nyjOrderHead)){
            return Result.error("数据错误");
        }
        return signService.saveAndSign(nyjOrderHead);
    }

POST提交网址传参

	@PostMapping("/test3")
    public String test3(HttpServletRequest request){
        log.info("id : "+request.getParameter("id"));
        return "";
    }

POST提交网址传参

	@PostMapping("/test4")
    public String test4(String id){
        log.info("id : "+id);
        return "";
    }

GET

GET网址传参

	@GetMapping("/test2")
    public String test2(HttpServletRequest request){
        log.info("id : "+request.getParameter("id"));
        return "";
    }

GET网址传参

	@GetMapping("/test5")
    public String test5(String id){
        log.info("id : "+id);
        return "";
    }

GET网址传参

	@GetMapping("/test6")
    public String test6(@RequestParam(name = "id", required = true) String id){
        log.info("id : "+id);
        return "";
    }

GET路由参数

	@GetMapping("/test7/{id}")
    public String test7(@PathVariable(name = "id", required = true) String id){
        log.info("id : "+id);
        return "";
    }

特殊案例

POST上传文件(图片举例)

@RequestMapping("/uploadImg")
    public JSONObject uploadImg(HttpServletRequest request, MultipartFile file){
        JSONObject jsonObject = new JSONObject();
        String mid = request.getParameter("mid");
        String rootPath = System.getProperty("catalina.home");
        rootPath = rootPath + "/img_data";

        File f = new File(rootPath);
        if(!f.exists()){
            f.mkdir();
        }
        if (StringUtils.isBlank(mid)){
            jsonObject.put("code",-100);
            jsonObject.put("msg","mid is error");
            return jsonObject;
        }

        String uuidStr = UUID.randomUUID().toString().replace("-","");
        String fileName = uuidStr + ".png";
        String filePath = rootPath + "/" + fileName;//本地绝对路径
        log.info("[图片接口]上传的图片本地绝对路径为->" + filePath);
        f = new File(filePath);
        try {
            file.transferTo(f);
        } catch (IOException e) {
            log.error("[图片接口]写文件到磁盘失败", e);
        }
        jsonObject.put("code",200);
        jsonObject.put("path",fileName);
        return jsonObject;
    }

GET访问图片

@RequestMapping("/getImg/{filename}")
    public void getImg(HttpServletResponse response, @PathVariable("filename") String filename){
        if(StringUtils.isBlank(filename)){
            //throw new AbpException("[图片接口]参数有误");
        }
        String rootPath = System.getProperty("catalina.home");
        String filePath = rootPath + "/img_data/" + filename;
        File imageFile = new File(filePath);
        if (imageFile.exists()){
            FileInputStream fis = null;
            OutputStream os = null;
            try {
                fis = new FileInputStream(imageFile);
                os = response.getOutputStream();
                int count = 0;
                byte[] buffer = new byte[1024 * 8];
                while((count = fis.read(buffer)) != -1){
                    os.write(buffer,0,count);
                    os.flush();
                }
                log.info("[图片接口]输出完成");
            } catch (Exception e) {
                log.error("[图片接口]打开图片失败，可能图片ID错误", e);
                //throw new AbpException("[图片接口]打开图片失败，可能图片ID错误");
            }finally {
                if(fis != null){
                    try {
                        fis.close();
                    } catch (IOException e) {
                        log.error("[图片接口]关闭输入流失败", e);
                        //throw new AbpException("[图片接口]关闭输入流失败");
                    }
                }
                if(os != null){
                    try {
                        os.close();
                    } catch (IOException e) {
                        log.error("[图片接口]关闭输出流失败", e);
                        //throw new AbpException("[图片接口]关闭输出流失败");
                    }
                }

            }

        }else{
            log.error("[图片接口]图片ID错误");
            //throw new AbpException("[图片接口]图片ID错误");
        }
    }