简单记录下RestTemplate中exchange()方法的使用

简单记录下RestTemplate中exchange()方法的使用

1.Post请求

post请求需要用LinkedMultiValueMap来传递参数
String url = "https://xx.xx.com/app/order/getNumber";
MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
paramMap.add("name", "name");
HttpHeaders headers = new HttpHeaders();
//headers可以详细设置请求头中的信息等
//HttpEntity里面包含了请求方和相应方的请求头和请求体,类似于@RequestBody和@ResponseBody
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap,headers);
ResponseEntity<String> response = template.exchange(url, HttpMethod.POST, httpEntity, String.class)

2.Get请求
    get请求的话可以直接在拼接请求路径后直接拼接参数/app/order/getNumber?name=name,也可以使用占位符/app/order/getNumber?name={name},通过Map来传参，但不能使用LinkedMultiValueMap，否则会报错
    String url = "https://xx.xx.com/app/order/getNumber?name={name}";
    Map<String, Object> paramMap = new HashMap<String, Object>();
    paramMap.add("name", "name");
    HttpHeaders headers = new HttpHeaders();
    HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(null,headers);
    //使用另一个重载的方法传递参数集合paramMap
    ResponseEntity<String> response = template.exchange(url, HttpMethod.GET, httpEntity, String.class,paramMap);