SpringBoot使用RestTemplate的示例詳解

更新時間：2023年05月29日 14:55:46 作者：java技術(shù)媛

RestTemplate繼承自InterceptingHttpAccessor并且實現(xiàn)了RestOperations接口，其中RestOperations接口定義了基本的RESTful操作，這些操作在RestTemplate中都得到了實現(xiàn)，這篇文章主要介紹了SpringBoot使用RestTemplate,需要的朋友可以參考下

RestTemplate 是由 Spring 提供的一個 HTTP 請求工具，它提供了常見的REST請求方案的模版，例如 GET 請求、POST 請求、PUT 請求、DELETE 請求以及一些通用的請求執(zhí)行方法 exchange 以及 execute。RestTemplate 繼承自 InterceptingHttpAccessor 并且實現(xiàn)了 RestOperations 接口，其中 RestOperations 接口定義了基本的 RESTful 操作，這些操作在 RestTemplate 中都得到了實現(xiàn)。

POST請求

postForObject

1、使用LinkedMultiValueMap作為參數(shù)（Form表單提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
paramMap.add("id", "123");
paramMap.add("name", "張三");
String result = template.postForObject(url, paramMap, String.class);
System.out.println("result:" + result);

2、使用Object作為參數(shù)（JSON提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
User user = new User(123, "張三");
String result = template.postForObject(url, user, String.class);
System.out.println("result:" + result);

3、使用JSONObject作為參數(shù)（JSON提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
JSONObject obj = new JSONObject();
obj.put("id", "123");
obj.put("name", "張三");
String result = template.postForObject(url, obj, String.class);
System.out.println("result:" + result);

postForEntity

1、使用LinkedMultiValueMap作為參數(shù)（Form表單提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
HttpHeaders headers = new HttpHeaders();
headers.set("token", "asdf");
MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
paramMap.add("id", "123");
paramMap.add("name", "張三");
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap, headers);
ResponseEntity<String> response = template.postForEntity(url, httpEntity, String.class);
System.out.println("result:" + response.getBody());

2、使用Object作為參數(shù)（JSON提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
HttpHeaders headers = new HttpHeaders();
User user = new User(123, "張三");
HttpEntity<User> httpEntity = new HttpEntity<User>(user, headers);
ResponseEntity<String> response = template.postForEntity(url, httpEntity, String.class);
System.out.println("result:" + response.getBody());

3、使用JSONObject為參數(shù)（JSON提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
HttpHeaders headers = new HttpHeaders();
JSONObject obj = new JSONObject();
obj.put("id", "123");
obj.put("name", "張三");
HttpEntity<JSONObject> httpEntity = new HttpEntity<JSONObject>(obj, headers);
ResponseEntity<String> response = template.postForEntity(url, httpEntity, String.class);
System.out.println("result:" + response.getBody());

exchange

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/productDetail";
HttpHeaders headers = new HttpHeaders();
MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
paramMap.add("id", "123");
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap, headers);
ResponseEntity<String> response = template.exchange(url, HttpMethod.POST, httpEntity, String.class);
System.out.println("result:" + response.getBody());

postForObject和postForEntity方法的區(qū)別主要在于可以在postForEntity方法中設置header的屬性，當需要指定header的屬性值的時候，使用postForEntity方法。

exchange方法和postForEntity類似，但是更靈活，exchange還可以調(diào)用get、put、delete請求。

GET請求

getForObject

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/detail?id={id}";
Map<String, Object> paramMap = new HashMap<String, Object>();
paramMap.put("id", "123");
String result = template.getForObject(url, String.class, paramMap);
System.out.println("result:" + result);

getForEntity

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/detail?id={id}";
Map<String, Object> paramMap = new HashMap<String, Object>();
paramMap.put("id", "123");
ResponseEntity<String> response1 = template.getForEntity(url, String.class, paramMap);
System.out.println("result:" + response1.getBody());

exchange

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/productDetail";
HttpHeaders headers = new HttpHeaders();
headers.set("token", "asdf");
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(null, headers);
ResponseEntity<String> response = template.exchange(url, HttpMethod.GET, httpEntity, String.class,paramMap);
System.out.println("result:" + response.getBody());

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