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SpringBoot使用RestTemplate的示例详解

作者：java技术媛

RestTemplate继承自InterceptingHttpAccessor并且实现了RestOperations接口，其中RestOperations接口定义了基本的RESTful操作，这些操作在RestTemplate中都得到了实现，这篇文章主要介绍了SpringBoot使用RestTemplate,需要的朋友可以参考下

RestTemplate 是由 Spring 提供的一个 HTTP 请求工具，它提供了常见的REST请求方案的模版，例如 GET 请求、POST 请求、PUT 请求、DELETE 请求以及一些通用的请求执行方法 exchange 以及 execute。RestTemplate 继承自 InterceptingHttpAccessor 并且实现了 RestOperations 接口，其中 RestOperations 接口定义了基本的 RESTful 操作，这些操作在 RestTemplate 中都得到了实现。

POST请求

postForObject

1、使用LinkedMultiValueMap作为参数（Form表单提交）

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", "张三");
String result = template.postForObject(url, paramMap, String.class);
System.out.println("result:" + result);

2、使用Object作为参数（JSON提交）

RestTemplate template = new RestTemplate();
String url = "http://127.0.0.1:8800/product/update";
User user = new User(123, "张三");
String result = template.postForObject(url, user, String.class);
System.out.println("result:" + result);

3、使用JSONObject作为参数（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", "张三");
String result = template.postForObject(url, obj, String.class);
System.out.println("result:" + result);

postForEntity

1、使用LinkedMultiValueMap作为参数（Form表单提交）

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", "张三");
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作为参数（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, "张三");
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为参数（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", "张三");
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方法的区别主要在于可以在postForEntity方法中设置header的属性，当需要指定header的属性值的时候，使用postForEntity方法。

exchange方法和postForEntity类似，但是更灵活，exchange还可以调用get、put、delete请求。

GET请求

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());

到此这篇关于SpringBoot使用RestTemplate的文章就介绍到这了,更多相关SpringBoot使用RestTemplate内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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