RestTemplate通过exchange方法发送post请求

通过exchange发送请求并设置header和请求体body

        RestTemplate template = new RestTemplate();

        String uriTemplate = "http://www.baidu.com";
        URI uri = UriComponentsBuilder.fromUriString(uriTemplate).build().toUri();
        // 自定义body实体类
        RequestDO requestDO = new RequestDO();
        requestDO.setProcessInstanceId(String.valueOf("1111"));
        String s = JSON.toJSONString(requestDO);
        RequestEntity<String> requestEntity = RequestEntity.post(uri)
                .accept(MediaType.APPLICATION_JSON)
                .header("Content-Type", "application/json")
                .body(s);
        ResponseEntity<String> exchange = template.exchange(requestEntity, String.class);
        String body = exchange.getBody();
        System.out.println(JSON.parseObject(body).toJSONString());