剑指Offer题目笔记25（使用回溯法解决其他类型问题）

问题如图

处理代码如下

 RestTemplate restTemplate = new RestTemplate();
            String url1 = SystemParam.getValue("interface");
            System.out.println("htmlContent----"+htmlContent);
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            HttpEntity<String> requestEntity = new HttpEntity<>(json, headers);
            String result = restTemplate.postForObject(url1, requestEntity, String.class);

相当于加上

 HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            HttpEntity<String> requestEntity = new HttpEntity<>(json, headers);

使用 HttpEntity 来发送请求实体，可以使用 HttpEntity 将 JSON 字符串发送到服务端，并且确保字符集为 UTF-8

以下为处理html模板页内容

public static String fetchTemplateHtml(String reporturl, String siteid, String nowDate) {
        String templateHtml = null;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            String url = 填写所要获取的地址接口，跳转html的接口以及接口内要有数据;下面就是处理解析数据然后放到对应的获取参数的位置，我这里处理的是不是通过ajax获取的参数，是通过原生，后端给前端通过model.addAttribute传递参数
            HttpGet httpGet = new HttpGet(url);
            httpGet.setHeader("Accept-Encoding", "UTF-8");
            httpGet.setHeader("Content-Type", "application/json; charset=UTF-8");
            CloseableHttpResponse response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == 200) {
                templateHtml = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return templateHtml;
    }