SpringMVC RestTemplate的幾種請求調用

 

轉載：https://blog.csdn.net/ThinkingLink/article/details/45366777

1.用統一的方法模板進行四種請求：POST,PUT,DELETE,GET

restTemplate.exchange(
        String url, 
        HttpMethod method, HttpEntity requestEntity, Class responseType, Object uriVariables[] )

 

說明：
1）url: 請求地址；
2）method: 請求類型(如：POST,PUT,DELETE,GET)；
3）requestEntity: 請求實體，封裝請求頭，請求內容
4）responseType: 響應類型，根據服務接口的返回類型決定
5）uriVariables: url中參數變量值

 

例如：

(1)POST請求

String reqJsonStr = "{\"code\":\"testCode\", \"group\":\"testGroup\",\"content\":\"testContent\", \"order\":1}";
HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> entity = new HttpEntity<String>(reqJsonStr,headers);
ResponseEntity<Map> resp = restTemplate.exchange(DIC_DATA_URL, HttpMethod.POST, entity, Map.class);

 

 

(2)PUT請求

String reqJsonStr = "{\"id\":227,\"code\":\"updateCC\", \"group\":\"UPDATE\",\"content\":\"updateCT\", \"order\":9}";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> entity = new HttpEntity<String>(reqJsonStr,headers);
ResponseEntity<Map> resp = restTemplate.exchange(DIC_DATA_URL, HttpMethod.PUT, entity, Map.class);

 

 

(3)DELETE請求

ResponseEntity<Map> resp = restTemplate.exchange(DIC_DATA_URL + "?id={id}", HttpMethod.DELETE, null, Map.class, 227);

 

(4)GET請求

ResponseEntity<String> results = restTemplate.exchange(url,HttpMethod.GET, null, String.class, params);

 

2.用各種請求對應的專一接口

(1)POST請求

postForObject(String url, Object request, Class responseType, Object uriVariables[]):

    返回數據對象Object，例如：
        DicData data = new DicData(); data.setCode("cd123"); data.setGroup("TEST"); data.setContent("測試數據"); data.setOrder(5); DicData obj = restTemplate.postForObject(DIC_DATA_URL, data, DicData.class); > 或者 postForEntity:(String url, Object request, Class responseType, Object uriVariables[])

返回封裝了數據對象的ResponseEntity對象，例如：
    DicData data = new DicData();
    data.setCode("cd123"); data.setGroup("TEST"); data.setContent("測試數據"); data.setOrder(5);        
    ResponseEntity<Map> respEntity = restTemplate.postForEntity(DIC_DATA_URL, data, Map.class);

> (2)PUT請求 put(String url, Object request, Object urlVariables[])

例如：
    DicData data = new DicData();
    data.setId(226L); data.setCode("updateCode"); data.setGroup("UPDATE"); 
    data.setContent("測試數據"); data.setOrder(9);      
    restTemplate.put(DIC_DATA_URL, data); 

> (3)DELETE請求 delete(String url, Object urlVariables[])

例如：
    restTemplate.delete(DIC_DATA_URL + "?id={id}", 222);

> (4)GET請求 getForObject(String url, Class responseType, Object urlVariables[])：

 

返回請求的結果對象，例如
    Order o = restTemplate.getForObject(Constants.SERVER_URL+"/order?orderCode={orderCode}",
                        Order.class,order.getOrderCode());
getForEntity(String url, Class responseType, Object urlVariables[])：
返回封裝了數據對象的ResponseEntity對象，例如：
ResponseEntity<EBTUser> ebtuserResponse = restTemplate.getForEntity(url,EBTUser.class);
EBTUser user = ebtuserResponse.getBody();

 

3.GET請求,要返回一些復合數據類型時的處理

> (1)返回List類型數據 DicData[] dicResult = restTemplate.getForObject( Constants.SERVER_URL + "/dicDatas/dicData?" + "group={group}", DicData[].class, group); List<DicData> list = Arrays.asList(dicResult);

或者

// pass generic information to resttemplate; ParameterizedTypeReference為spring3.2版本后引進的類 ParameterizedTypeReference<List<DicData>> responseType = new ParameterizedTypeReference<List<DicData>>(); ResponseEntity<List<DicData>> resp = restTemplate.exchange(Constants.SERVER_URL + "/dicDatas/dicData?group={group}", HttpMethod.GET, null, responseType); List<DicData> list = resp.getBody();

> (2)返回屬性中有范型數據的復合對象 比如，分頁對象 ResponseEntity<String> results = restTemplate.exchange(url,HttpMethod.GET, null, String.class, params); // 借助com.fasterxml.jackson.databind.ObjectMapper 對象來解析嵌套的json字符串 ObjectMapper mapper = new ObjectMapper(); mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); PageInfo<Product> page = mapper.readValue(results.getBody(), new TypeReference<PageInfo<Product>>() { });