RestTemplate实践：Java中如何发送Post请求？

// 封装请求内容
Map<String,Object> params = MapUtil.newHashMap();
// 请求的url
String url = "http://localhost:10086/login";
params.put("username","root");
params.put("password",123456);
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
// 设置请求头
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity httpEntity = new HttpEntity(params, headers);
ResponseEntity<String> entity = restTemplate.postForEntity(url, httpEntity, String.class);
// 打印响应结果
System.out.println(entity.getBody());

{
    "returnCode":"200",
    "returnMessage":"提交成功，数据处理中，请 30 分钟后请调用增量查询结果接口,进行查看本次推送结果......",
    "returnData":{
        "size":1,
        "time":"2022-04-15T09:48:55.938"
    },
    "returnCount":null
}