RestTemplate之获取原请求，替换转发

    public String transmit(HttpServletRequest request, HttpMethod method, @RequestBody(required = false) String body) {
        String value=null;
        Enumeration<?> enumHeader = request.getHeaderNames();
        HashMap<String, String> data = new HashMap<>();
        //遍历Headers 获取AppCode
        while (enumHeader.hasMoreElements()) {
            String key = (String) enumHeader.nextElement();
            value = request.getHeader(key);
            //获取AppCode
            if (key.equals("authorization")) {
                String[] code = value.split(" ");

                data.put("appcode", code[0]);
                data.put("appkey", code[1]);
                data.put("appsecret", code[2]);
            }
        }
        String p = null;
        String stock = null;
        QueryWrapper<InfoEntity> wrapper=new QueryWrapper<>();
        QueryWrapper<InfoEntity> eq = wrapper.select("stock","sales").eq("sales", data.get("appcode"));//构造条件
        List<InfoEntity> infoEntities = infoDao.selectList(eq);
        for (int i = 0; i < infoEntities.size(); i++) {
            InfoEntity infoEntity1=infoEntities.get(i);
            p=infoEntity1.getStock();
        }
        for (InfoEntity entity : infoEntities) {
            stock= entity.getStock();
        }
        try {
            // 根据request，构造HttpHeaders
            HttpHeaders headers = new HttpHeaders();
            Enumeration<String> headerNames = request.getHeaderNames();
            while(headerNames.hasMoreElements()){
                String name = (String)headerNames.nextElement();
                 value = request.getHeader(name);
                 if (name.equals("authorization")){
                     headers.add("authorization",p);
                 } else if (name.equals("content-type")){
                     headers.remove(name);
                 } else{
                     headers.add(name,value);
                 }
            }

            // 复制 request 的参数
            Map<String, String[]> parameterMap = request.getParameterMap();
            MultiValueMap<String, Object> params = new LinkedMultiValueMap<String, Object>();
            // 附加参数值
            Set<String> keySet = parameterMap.keySet();
            for (String key : keySet) {
                String[] values = parameterMap.get(key);
                params.add(key, values[0]);
            }
            // 根据body内容填充requestEntity。对于form-data，body为空但parameterMap有值；对于raw，body不为空。
            HttpEntity<Object> requestEntity = (body!=null && !body.isEmpty())?
                    new HttpEntity<>(body, headers): new HttpEntity<>(params, headers);

            // 构造URI。必须拼接出String url然后创建URI，否则会出现queryString %符号转%25的问题
           // String Url = "https://www.baidu.com";
            if (request.getQueryString()!=null && !request.getQueryString().isEmpty()) Url += "?" + request.getQueryString();
            URI destUri = new URI(Url);
            // 向服务请求
            RestTemplate restTemplate = new RestTemplate();
            ResponseEntity<String> responseEntity = restTemplate.exchange(destUri, method, requestEntity, String.class);
            return responseEntity.getBody();
        } catch (Exception e) {
            e.printStackTrace();
            return "转发失败";
        }
    }

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