SpringMVC RestTemplate的几种请求调用
2015-04-29 15:01
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SpringMVC RestTemplate的几种请求调用
例如:
(1)POST请求
(2)PUT请求
(3)DELETE请求
(4)GET请求
1.用统一的方法模板进行四种请求:POST,PUT,DELETE,GET
restTemplate.exchange( String url, HttpMethod method, HttpEntity requestEntity, Class responseType, Object uriVariables[] )
说明: 1)url: 请求地址; 2)method: 请求类型(如:POST,PUT,DELETE,GET); 3)requestEntity: 请求实体,封装请求头,请求内容 4)responseType: 响应类型,根据服务接口的返回类型决定 5)uriVariables: url中参数变量值
例如:
(1)POST请求
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请求
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请求
ResponseEntity<Map> resp = restTemplate.exchange(DIC_DATA_URL + "?id={id}", HttpMethod.DELETE, null, Map.class, 227);
(4)GET请求
ResponseEntity<String> results = restTemplate.exchange(url,HttpMethod.GET, null, String.class, params);
2.用各种请求对应的专一接口
(1)POST请求postForObject(String url, Object request, Class responseType, Object uriVariables[]):
返回数据对象Object,例如: DicData data = new DicData(); data.setCode("cd123"); data.setGroup("TEST"); data.setContent("测试数据"); data.setOrder(5); DicData obj = restTemplate.postForObject(DIC_DATA_URL, data, DicData.class); > 或者 postForEntity:(String url, Object request, Class responseType, Object uriVariables[])
返回封装了数据对象的ResponseEntity对象,例如: DicData data = new DicData(); data.setCode("cd123"); data.setGroup("TEST"); data.setContent("测试数据"); data.setOrder(5); ResponseEntity<Map> respEntity = restTemplate.postForEntity(DIC_DATA_URL, data, Map.class);
> (2)PUT请求 put(String url, Object request, Object urlVariables[])
例如: DicData data = new DicData(); data.setId(226L); data.setCode("updateCode"); data.setGroup("UPDATE"); data.setContent("测试数据"); data.setOrder(9); restTemplate.put(DIC_DATA_URL, data);
> (3)DELETE请求 delete(String url, Object urlVariables[])
例如: restTemplate.delete(DIC_DATA_URL + "?id={id}", 222);
> (4)GET请求 getForObject(String url, Class responseType, Object urlVariables[]):
返回请求的结果对象,例如 Order o = restTemplate.getForObject(Constants.SERVER_URL+"/order?orderCode={orderCode}", Order.class,order.getOrderCode()); getForEntity(String url, Class responseType, Object urlVariables[]): 返回封装了数据对象的ResponseEntity对象,例如: ResponseEntity<EBTUser> ebtuserResponse = restTemplate.getForEntity(url,EBTUser.class); EBTUser user = ebtuserResponse.getBody();
3.GET请求,要返回一些复合数据类型时的处理
> (1)返回List类型数据 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为spring3.2版本后引进的类 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)返回属性中有范型数据的复合对象
比如,分页对象
ResponseEntity<String> results = restTemplate.exchange(url,HttpMethod.GET, null, String.class, params);// 借助com.fasterxml.jackson.databind.ObjectMapper 对象来解析嵌套的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>>() { });
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