【RestTemplate】使用学习

【RestTemplate】使用学习

Url中带参数，request body带json

MultiValueMap<String, String> param = new LinkedMultiValueMap<>();
param.add("appid", "youappid");
param.add("message", "Hello World!");
param.add("sign", "sign");

UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url).queryParams(param);

HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.APPLICATION_JSON);//MediaType.TEXT_PLAIN
HttpEntity<String> httpEntity = new HttpEntity<>(json, httpHeaders);

ResponseEntity<Map> responseEntity = restTemplate.postForEntity(builder.toUriString(), httpEntity, Map.class);

log.error("返回状态：" + responseEntity.getStatusCodeValue());
log.error("返回内容：" + responseEntity.getBody());
log.error("返回对象：" + JSONUtil.toJsonStr(responseEntity));

上传文件 multipart/form-data 方式

private String uploadFile(String content) {
    Random random = new Random();
    String tempFileName = UUID.randomUUID().toString().replaceAll("-", "") + random.nextInt(99999);
    File file = null;
    try {
        file = File.createTempFile(tempFileName, ".html");
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(content.getBytes(Charsets.UTF_8));
        fos.flush();
        fos.close();

        MultiValueMap<String, String> param = new LinkedMultiValueMap<>();
        param.add("appId", "testappId");

        UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl("http://www.yousys.com/upload").queryParams(param);

        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.MULTIPART_FORM_DATA);


        MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
        body.add("appId", "testappId");
        body.add("file", new FileSystemResource(file));

        HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<>(body, httpHeaders);
        ResponseEntity<Map> responseEntity = restTemplate.postForEntity(builder.toUriString(), httpEntity, Map.class);
        Map map = responseEntity.getBody(); // {code=0, msg=操作成功, data={fileURL=20201125143909/ace0bd4d7a80414099100cb34b58495d.html}, isHitCache=0}
        if ("0".equals(String.valueOf(map.get("code"))) && Objects.nonNull(map.get("data"))) {
            Map data = (Map) map.get("data");
            return String.valueOf(data.get("fileURL"));
        }
    } catch (Exception e) {
        log.error(e.getMessage());
        e.printStackTrace();
    } finally {
        if (file != null && file.exists()) {
            file.delete();
        }
    }
    return "";
}