我有两个问题:
如何使用Spring RestTemplate映射JSON对象列表。 如何映射嵌套的JSON对象。
我试图消费https://bitpay.com/api/rates,从http://spring.io/guides/gs/consuming-rest/遵循教程。
我有两个问题:
如何使用Spring RestTemplate映射JSON对象列表。 如何映射嵌套的JSON对象。
我试图消费https://bitpay.com/api/rates,从http://spring.io/guides/gs/consuming-rest/遵循教程。
当前回答
更简单的方法: 我会给你们看Authorization heard和unauthorization header:
未经授权: a.进行依赖注入(构造函数注入): 你也可以选择字段注入。我考虑了构造函数注入。
public class RestTemplateService {
private final RestTemplate template;
public RestTemplateService(RestTemplate template) {
this.template = template;
}
}
b.调用getList()方法:
public ResponseEntity<List> getResponseList(String url, HttpMethod type) {
return template.exchange(url, type, new HttpEntity<>(new HttpHeaders()), List.class);
}
授权:我喜欢小方法。所以我把这些功能分开:
public ResponseEntity<List> getResponse(String url, HttpMethod type) {
return template.exchange(url, type, getRequest(getHeaders(USERNAME, PASS)), List.class);
}
private HttpEntity<String> getRequest(HttpHeaders headers) {
return new HttpEntity<>(headers);
}
private HttpHeaders getHeaders(String username, String password) {
HttpHeaders headers = new HttpHeaders();
headers.add("Authorization", "Basic " + new String(Base64.encodeBase64((username + ":" + password).getBytes())));
return headers;
}
希望问题能得到解决!
其他回答
我在这里遇到的最大问题是构建将RestTemplate匹配到兼容类所需的Object结构。幸运的是,我找到了http://www.jsonschema2pojo.org/(在浏览器中获得JSON响应并将其作为输入),我非常推荐这个功能!
对于那些使用Spring + Kotlin的人来说,下面是翻译:
val rates = restTemplate.exchange("https://bitpay.com/api/rates", HttpMethod.GET, null, object : ParameterizedTypeReference<List<Rate>>() {}).body!!
在我的情况下,我更喜欢提取一个字符串,然后使用JsonNode接口浏览上下文
var response = restTemplate.exchange("https://my-url", HttpMethod.GET, entity, String.class);
if (response.getStatusCode() == HttpStatus.OK) {
var jsonString = response.getBody();
ObjectMapper mapper = new ObjectMapper();
JsonNode actualObj = mapper.readTree(jsonString);
System.out.println(actualObj);
}
或者很快
ObjectNode actualObj= restTemplate.getForObject("https://my-url", ObjectNode.class);
然后读取内部数据与路径表达式,即。
boolean b = actualObj.at("/0/states/0/no_data").asBoolean();
你可以为每个条目创建POJO,
class BitPay{
private String code;
private String name;
private double rate;
}
然后使用BitPay列表的ParameterizedTypeReference,你可以使用:
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<List<Employee>> response = restTemplate.exchange(
"https://bitpay.com/api/rates",
HttpMethod.GET,
null,
new ParameterizedTypeReference<List<BitPay>>(){});
List<Employee> employees = response.getBody();
实际上,我之前为我的一个项目开发了一些功能,以下是代码:
/**
* @param url is the URI address of the WebService
* @param parameterObject the object where all parameters are passed.
* @param returnType the return type you are expecting. Exemple : someClass.class
*/
public static <T> T getObject(String url, Object parameterObject, Class<T> returnType) {
try {
ResponseEntity<T> res;
ObjectMapper mapper = new ObjectMapper();
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
((SimpleClientHttpRequestFactory) restTemplate.getRequestFactory()).setConnectTimeout(2000);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<T> entity = new HttpEntity<T>((T) parameterObject, headers);
String json = mapper.writeValueAsString(restTemplate.exchange(url, org.springframework.http.HttpMethod.POST, entity, returnType).getBody());
return new Gson().fromJson(json, returnType);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* @param url is the URI address of the WebService
* @param parameterObject the object where all parameters are passed.
* @param returnType the type of the returned object. Must be an array. Exemple : someClass[].class
*/
public static <T> List<T> getListOfObjects(String url, Object parameterObject, Class<T[]> returnType) {
try {
ObjectMapper mapper = new ObjectMapper();
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
((SimpleClientHttpRequestFactory) restTemplate.getRequestFactory()).setConnectTimeout(2000);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<T> entity = new HttpEntity<T>((T) parameterObject, headers);
ResponseEntity<Object[]> results = restTemplate.exchange(url, org.springframework.http.HttpMethod.POST, entity, Object[].class);
String json = mapper.writeValueAsString(results.getBody());
T[] arr = new Gson().fromJson(json, returnType);
return Arrays.asList(arr);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
我希望这能帮助到别人!