restTemplate 添加请求body

在使用`restTemplate`添加请求body时，可以使用以下几种方法：

1. 使用`postForObject`方法发送POST请求并获取响应结果，将请求参数以`MultiValueMap`的形式存储在`paramMap`中，然后将`paramMap`作为参数传入`postForObject`方法中。例如：

MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
paramMap.add("dt", "20190225");
String result = template.postForObject(url, paramMap, String.class);

2. 使用`postForEntity`方法发送POST请求并获取响应结果。首先创建`HttpHeaders`和`HttpEntity`对象，将请求参数以`MultiValueMap`的形式存储在`paramMap`中，然后将`paramMap`和`headers`作为参数传入`HttpEntity`构造函数中，最后将`HttpEntity`对象作为参数传入`postForEntity`方法中。例如：

HttpHeaders headers = new HttpHeaders();
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap, headers);
ResponseEntity<String> response2 = template.postForEntity(url, httpEntity, String.class);

3. 使用`exchange`方法发送POST请求并获取响应结果。首先创建`HttpHeaders`和`HttpEntity`对象，将请求参数以`MultiValueMap`的形式存储在`paramMap`中，然后将`paramMap`和`headers`作为参数传入`HttpEntity`构造函数中，最后将`HttpEntity`对象作为参数传入`exchange`方法中。例如：

HttpHeaders headers = new HttpHeaders();
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap, headers);
ResponseEntity<String> response3 = template.exchange(url, HttpMethod.POST, httpEntity, String.class);

以上是使用`restTemplate`添加请求body的几种方法，根据具体情况选择适合的方法进行使用。
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