blocks|key|2743303|text|也许这样..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2743304|ResponseEntity<Object[]>+responseEntity+=+restTemplate.getForEntity(urlGETList,+Object[].class);
Object[]+objects+=+responseEntity.getBody();
MediaType+contentType+=+responseEntity.getHeaders().getContentType();
HttpStatus+statusCode+=+responseEntity.getStatusCode();|code-block|syntax|javascript|2743305|RequestMapping的控制器代码|offset|length|style|CODE|2743306|@RequestMapping(value="/Object/getList/",+method=RequestMethod.GET)
public+@ResponseBody+List<Object>+findAllObjects()+{

++++List<Object>+objects+=+new+ArrayList<Object>();
++++return+objects;
}|2743307|ResponseEntity是HttpEntity的扩展，它添加了HttpStatus状态代码。在RestTemplate以及@Controller方法中使用。在RestTemplate中，这个类由getForEntity()和exchange()返回。|2743308|entityMap^0|0|0|0|E|0|0|0|E|F|A|X|A|1D|C|1R|B|29|C|2R|E|36|A|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]|$I|13|J|14|K|L]|$I|15|J|16|K|L]|$I|17|J|18|K|L]|$I|19|J|1A|K|L]|$I|1B|J|1C|K|L]|$I|1D|J|1E|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|R|$]]

Maybe this way...

<pre><code>ResponseEntity&lt;Object[]&gt; responseEntity = restTemplate.getForEntity(urlGETList, Object[].class);
Object[] objects = responseEntity.getBody();
MediaType contentType = responseEntity.getHeaders().getContentType();
HttpStatus statusCode = responseEntity.getStatusCode();
</code></pre>

Controller code for the <code>RequestMapping</code>

<pre><code>@RequestMapping(value="/Object/getList/", method=RequestMethod.GET)
public @ResponseBody List&lt;Object&gt; findAllObjects() {

 List&lt;Object&gt; objects = new ArrayList&lt;Object&gt;();
 return objects;
}
</code></pre>

<code>ResponseEntity</code> is an extension of <code>HttpEntity</code> that adds a <code>HttpStatus</code> status code. Used in <code>RestTemplate</code> as well <code>@Controller</code> methods.
In <code>RestTemplate</code> this class is returned by <code>getForEntity()</code> and <code>exchange()</code>.

blocks|key|2955982|text|对我来说，这是可行的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2955983|Object[]+forNow+=+template.getForObject("URL",+Object[].class);
++++searchList=+Arrays.asList(forNow);|code-block|syntax|javascript|2955984|其中Object是您想要的类|2955985|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For me this worked 

<pre><code>Object[] forNow = template.getForObject("URL", Object[].class);
 searchList= Arrays.asList(forNow);
</code></pre>

Where Object is the class you want

blocks|key|2743397|text|我在这篇文章中找到了https://jira.spring.io/browse/SPR-8263的工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2743398|基于这篇文章，你可以返回一个类型列表，如下所示：|2743399|ResponseEntity<?+extends+ArrayList<User>>+responseEntity+=+restTemplate.getForEntity(restEndPointUrl,+(Class<?+extends+ArrayList<User>>)ArrayList.class,+userId);|code-block|syntax|javascript|2743400|entityMap|0|LINK|mutability|MUTABLE|url|https://jira.spring.io/browse/SPR-8263^0|A|12|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

I found work around from this post <a href="https://jira.spring.io/browse/SPR-8263" rel="nofollow">https://jira.spring.io/browse/SPR-8263</a>.

Based on this post you can return a typed list like this:

<pre><code>ResponseEntity&lt;? extends ArrayList&lt;User&gt;&gt; responseEntity = restTemplate.getForEntity(restEndPointUrl, (Class&lt;? extends ArrayList&lt;User&gt;&gt;)ArrayList.class, userId);
</code></pre>

blocks|key|2956169|text|首先定义一个对象来保存返回到数组中的实体。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2956170|@JsonIgnoreProperties(ignoreUnknown+=+true)
public+class+Rate+{
++++private+String+name;
++++private+String+code;
++++private+Double+rate;
++++//+add+getters+and+setters
}|code-block|syntax|javascript|2956171|然后，您可以使用该服务，并通过以下方式获取强类型列表：|2956172|ResponseEntity<List<Rate>>+rateResponse+=
++++++++restTemplate.exchange("https://bitpay.com/api/rates",
++++++++++++++++++++HttpMethod.GET,+null,+new+ParameterizedTypeReference<List<Rate>>()+{
++++++++++++});
List<Rate>+rates+=+rateResponse.getBody();|2956173|上面的其他解决方案也可以，但我喜欢得到一个强类型的列表，而不是一个Object[]。|2956174|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

First define an object to hold the entity coming back in the array.. e.g.

<pre><code>@JsonIgnoreProperties(ignoreUnknown = true)
public class Rate {
 private String name;
 private String code;
 private Double rate;
 // add getters and setters
}
</code></pre>

Then you can consume the service and get a strongly typed list via: 

<pre><code>ResponseEntity&lt;List&lt;Rate&gt;&gt; rateResponse =
 restTemplate.exchange("https://bitpay.com/api/rates",
 HttpMethod.GET, null, new ParameterizedTypeReference&lt;List&lt;Rate&gt;&gt;() {
 });
List&lt;Rate&gt; rates = rateResponse.getBody();
</code></pre>

The other solutions above will also work, but I like getting a strongly typed list back instead of an Object[].

blocks|key|155837|text|经过多次测试，这是我发现的最好的方法:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|155838|Set<User>+test+=+httpService.get(url).toResponseSet(User[].class);|code-block|syntax|javascript|155839|你需要做的就是|155840|public+<T>+Set<T>+toResponseSet(Class<T[]>+setType)+{
++++HttpEntity<?>+body+=+new+HttpEntity<>(objectBody,+headers);
++++ResponseEntity<T[]>+response+=+template.exchange(url,+method,+body,+setType);
++++return+Sets.newHashSet(response.getBody());
}|155841|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

After multiple tests, this is the best way I found :)

<pre><code>Set&lt;User&gt; test = httpService.get(url).toResponseSet(User[].class);
</code></pre>

All you need there

<pre><code>public &lt;T&gt; Set&lt;T&gt; toResponseSet(Class&lt;T[]&gt; setType) {
 HttpEntity&lt;?&gt; body = new HttpEntity&lt;&gt;(objectBody, headers);
 ResponseEntity&lt;T[]&gt; response = template.exchange(url, method, body, setType);
 return Sets.newHashSet(response.getBody());
}
</code></pre>

blocks|key|2743558|text|我这里最大的问题是构建将RestTemplate匹配到兼容类所需的对象结构。幸运的是，我找到了http://www.jsonschema2pojo.org/+(在浏览器中获取JSON响应并将其用作输入)，我不能完全推荐它！|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2743559|entityMap|0|LINK|mutability|MUTABLE|url|http://www.jsonschema2pojo.org/^0|1B|V|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

My big issue here was to build the Object structure required to match RestTemplate to a compatible Class. Luckily I found <a href="http://www.jsonschema2pojo.org/" rel="nofollow noreferrer">http://www.jsonschema2pojo.org/</a> (get the JSON response in a browser and use it as input) and I can't recommend this enough!

blocks|key|2956222|text|如果您更喜欢POJO列表，一种方法是这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2956223|class+SomeObject+{
++++private+int+id;
++++private+String+name;
}|code-block|syntax|javascript|2956224|public+<T>+List<T>+getApi(final+String+path,+final+HttpMethod+method)+{+++++
++++final+RestTemplate+restTemplate+=+new+RestTemplate();
++++final+ResponseEntity<List<T>>+response+=+restTemplate.exchange(
++++++path,
++++++method,
++++++null,
++++++new+ParameterizedTypeReference<List<T>>(){});
++++List<T>+list+=+response.getBody();
++++return+list;
}|2956225|像这样使用它：|2956226|+List<SomeObject>+list+=+someService.getApi("http://localhost:8080/some/api",HttpMethod.GET);|2956227|上面的解释可以在这里找到(https://www.baeldung.com/spring-rest-template-list)，并在下面进行解释。|offset|length|2956228|“在上面的代码中发生了一些事情。首先，我们使用ResponseEntity作为返回类型，使用它包装我们真正想要的对象列表。其次，我们调用RestTemplate.exchange()而不是getForObject()。|2956229|这是使用RestTemplate的最通用的方法。它要求我们指定HTTP方法、可选的请求主体和响应类型。在本例中，我们使用ParameterizedTypeReference的匿名子类作为响应类型。|2956230|最后一部分允许我们将JSON响应转换为适当类型的对象列表。当我们创建ParameterizedTypeReference的匿名子类时，它使用反射来捕获有关我们想要将响应转换为的类类型的信息。|2956231|它使用Java的Type对象保存此信息，我们不再需要担心类型擦除。“|2956232|entityMap|0|LINK|mutability|MUTABLE|url|https://www.baeldung.com/spring-rest-template-list^0|0|0|0|0|0|D|1E|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|1B|8|@]|9|@$O|1C|P|1D|1|1E]]|A|$]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1H|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1I|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

If you would prefer a List of POJOs, one way to do it is like this:
<pre><code>class SomeObject {
 private int id;
 private String name;
}

</code></pre>
<pre><code>public &lt;T&gt; List&lt;T&gt; getApi(final String path, final HttpMethod method) { 
 final RestTemplate restTemplate = new RestTemplate();
 final ResponseEntity&lt;List&lt;T&gt;&gt; response = restTemplate.exchange(
 path,
 method,
 null,
 new ParameterizedTypeReference&lt;List&lt;T&gt;&gt;(){});
 List&lt;T&gt; list = response.getBody();
 return list;
}
</code></pre>
And use it like so:
<pre><code> List&lt;SomeObject&gt; list = someService.getApi(&quot;http://localhost:8080/some/api&quot;,HttpMethod.GET);
</code></pre>
Explanation for the above can be found here (<a href="https://www.baeldung.com/spring-rest-template-list" rel="nofollow noreferrer">https://www.baeldung.com/spring-rest-template-list</a>) and is paraphrased below.
&quot;There are a couple of things happening in the code above. First, we use ResponseEntity as our return type, using it to wrap the list of objects we really want. Second, we are calling RestTemplate.exchange() instead of getForObject().
This is the most generic way to use RestTemplate. It requires us to specify the HTTP method, optional request body, and a response type. In this case, we use an anonymous subclass of ParameterizedTypeReference for the response type.
This last part is what allows us to convert the JSON response into a list of objects that are the appropriate type. When we create an anonymous subclass of ParameterizedTypeReference, it uses reflection to capture information about the class type we want to convert our response to.
It holds on to this information using Java’s Type object, and we no longer have to worry about type erasure.&quot;

blocks|key|2956237|text|请考虑查看此答案，特别是当您希望在List+Spring+RestTemplate+and+generic+types+ParameterizedTypeReference+collections+like+List中使用泛型时|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2956238|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/36915823/spring-resttemplate-and-generic-types-parameterizedtypereference-collections-lik/53398952#53398952^0|H|4|M|2E|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Consider see this answer, specially if you want use generics in <code>List</code>
<a href="https://stackoverflow.com/questions/36915823/spring-resttemplate-and-generic-types-parameterizedtypereference-collections-lik/53398952#53398952">Spring RestTemplate and generic types ParameterizedTypeReference collections like List&lt;T&gt;</a>

blocks|key|2956244|text|实际上，我之前为我的一个项目开发了一些功能性的东西，下面是代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2956245|/**
+*+@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;
++++}
}|code-block|syntax|javascript|2956246|我希望这能对某些人有所帮助！|2956247|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

i actually deveopped something functional for one of my projects before and here is the code :

<pre><code>/**
 * @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 &lt;T&gt; T getObject(String url, Object parameterObject, Class&lt;T&gt; returnType) {
 try {
 ResponseEntity&lt;T&gt; 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&lt;T&gt; entity = new HttpEntity&lt;T&gt;((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 &lt;T&gt; List&lt;T&gt; getListOfObjects(String url, Object parameterObject, Class&lt;T[]&gt; 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&lt;T&gt; entity = new HttpEntity&lt;T&gt;((T) parameterObject, headers);
 ResponseEntity&lt;Object[]&gt; 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;
 }
}
</code></pre>

I hope that this will help somebody !

blocks|key|2743635|text|可以为每个条目创建POJO，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2743636|class+BitPay{
private+String+code;
private+String+name;
private+double+rate;
}|code-block|syntax|javascript|2743637|然后使用BitPay列表的ParameterizedTypeReference，您可以将其用作：|2743638|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();|2743639|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can create POJO for each entry like,

<pre><code>class BitPay{
private String code;
private String name;
private double rate;
}
</code></pre>

then using ParameterizedTypeReference of List of BitPay you can use as:

<pre><code>RestTemplate restTemplate = new RestTemplate();
ResponseEntity&lt;List&lt;Employee&gt;&gt; response = restTemplate.exchange(
 "https://bitpay.com/api/rates",
 HttpMethod.GET,
 null,
 new ParameterizedTypeReference&lt;List&lt;BitPay&gt;&gt;(){});
List&lt;Employee&gt; employees = response.getBody();
</code></pre>

blocks|key|2956281|text|在我的例子中，我更喜欢提取一个字符串，然后使用JsonNode接口浏览上下文|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2956282|++++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);++
++++}|code-block|syntax|javascript|2956283|或者快一点|2956284|ObjectNode+actualObj=+restTemplate.getForObject("https://my-url",+ObjectNode.class);|2956285|然后使用路径表达式读取内部数据，即|2956286|boolean+b+=+actualObj.at("/0/states/0/no_data").asBoolean();|2956287|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

In my case I preferred to extract a String then browse the context using JsonNode interface
<pre><code> var response = restTemplate.exchange(&quot;https://my-url&quot;, 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); 
 }
</code></pre>
or quickly
<pre><code>ObjectNode actualObj= restTemplate.getForObject(&quot;https://my-url&quot;, ObjectNode.class);
</code></pre>
then read inner data with path expression i.e.
<pre><code>boolean b = actualObj.at(&quot;/0/states/0/no_data&quot;).asBoolean();
</code></pre>

blocks|key|2956297|text|作为一个通用模块，Page<?>对象可以像JodaModule、Log4jJsonModule等一样被module反序列化。请参考我的回答。JsonMappingException+when+testing+endpoints+with+Pageable+field|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2956298|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/50826061/jsonmappingexception-when-testing-endpoints-with-pageable-field/67866480#67866480^0|9|7|L|A|W|F|1F|6|1Y|1R|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

As a general module， <code>Page&lt;?&gt;</code> object can be deserialized by <code>module</code> just like <code>JodaModule</code>, <code>Log4jJsonModule</code> and so on. refer to this answer of mine.<a href="https://stackoverflow.com/questions/50826061/jsonmappingexception-when-testing-endpoints-with-pageable-field/67866480#67866480">JsonMappingException when testing endpoints with Pageable field</a>

blocks|key|2743661|text|这里提到了3种检索对象列表的替代方法。所有这些都将完美地工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2743662|@RequestMapping(value+=+"/emp2",+produces+=+"application/json")
public+List<Employee>+getEmp2()
{
++++HttpHeaders+headers+=+new+HttpHeaders();
++++headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
++++HttpEntity<String>+entity+=+new+HttpEntity<String>(headers);
++++ResponseEntity<List<Employee>>+response+=+restTemplate.exchange(
++++++++++++"http://hello-server/rest/employees",+HttpMethod.GET,entity,+
++++new+ParameterizedTypeReference<List<Employee>>()+{});
++++return+response.getBody();
}|code-block|syntax|javascript|2743663|2743664|+(OR)|blockquote|2743665|2743666|2743667|@RequestMapping(value+=+"/emp3",+produces+=+"application/json")
public+List<Employee>+getEmp3()
{
++++Employee[]+empArray+=+restTemplate.getForObject("http://hello-server/rest/employees",+Employee[].class);
++++List<Employee>+emp=+Arrays.asList(empArray);
++++return+emp;
}|2743668|2743669|+(OR)|2743670|2743671|2743672|++++@RequestMapping(value+=+"/emp4",+produces+=+"application/json")
public+Employee[]+getEmp4()
{
++++ResponseEntity<Employee[]>+responseEntity+=+restTemplate.getForEntity("http://hello-server/rest/employees",+Employee[].class);
++++Employee[]+empList+=+responseEntity.getBody();
++++//MediaType+contentType+=+responseEntity.getHeaders().getContentType();
++++//HttpStatus+statusCode+=+responseEntity.getStatusCode();
++++return++empList;
}|2743673|Employee.class|offset|length|style|BOLD|2743674|public+class+Employee+{

private+Integer+id;
private+String+name;
private+String+Designation;
private+String+company;

//getter+setters+and+toString()

}|2743675|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|E|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|18|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|P|3|Q|5|J|7|1D|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|T|3|U|5|D|7|1G|8|@]|9|@]|A|$E|F]]|$1|V|3|W|5|6|7|1H|8|@$X|1I|Y|1J|Z|10]]|9|@]|A|$]]|$1|11|3|12|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|13|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|14|$]]

3 alternative ways have mentioned here to retrieve list of objects. All of these will work flawlessly
<pre><code>@RequestMapping(value = &quot;/emp2&quot;, produces = &quot;application/json&quot;)
public List&lt;Employee&gt; getEmp2()
{
 HttpHeaders headers = new HttpHeaders();
 headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
 HttpEntity&lt;String&gt; entity = new HttpEntity&lt;String&gt;(headers);
 ResponseEntity&lt;List&lt;Employee&gt;&gt; response = restTemplate.exchange(
 &quot;http://hello-server/rest/employees&quot;, HttpMethod.GET,entity, 
 new ParameterizedTypeReference&lt;List&lt;Employee&gt;&gt;() {});
 return response.getBody();
}
</code></pre>
<blockquote>
(OR)
</blockquote>
<pre><code>@RequestMapping(value = &quot;/emp3&quot;, produces = &quot;application/json&quot;)
public List&lt;Employee&gt; getEmp3()
{
 Employee[] empArray = restTemplate.getForObject(&quot;http://hello-server/rest/employees&quot;, Employee[].class);
 List&lt;Employee&gt; emp= Arrays.asList(empArray);
 return emp;
}
</code></pre>
<blockquote>
(OR)
</blockquote>
<pre><code> @RequestMapping(value = &quot;/emp4&quot;, produces = &quot;application/json&quot;)
public Employee[] getEmp4()
{
 ResponseEntity&lt;Employee[]&gt; responseEntity = restTemplate.getForEntity(&quot;http://hello-server/rest/employees&quot;, Employee[].class);
 Employee[] empList = responseEntity.getBody();
 //MediaType contentType = responseEntity.getHeaders().getContentType();
 //HttpStatus statusCode = responseEntity.getStatusCode();
 return empList;
}
</code></pre>
Employee.class
<pre><code>public class Employee {

private Integer id;
private String name;
private String Designation;
private String company;

//getter setters and toString()

}
</code></pre>

blocks|key|2743836|text|更简单的方式：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2743837|我将向你们展示有授权听到和没有授权头部的两种情况：|2743838|2743839|Without授权：|ordered-list-item|2743840|2743841|a.+做依赖注入(构造器注入)：你也可以选择字段注入。我考虑过构造函数注入。|2743842|public+class+RestTemplateService+{
private+final+RestTemplate+template;
public+RestTemplateService(RestTemplate+template)+{
++++this.template+=+template;
++}
}|code-block|syntax|javascript|2743843|b.+调用getList()方法：|2743844|public+ResponseEntity<List>+getResponseList(String+url,+HttpMethod+type)+{
++++return+template.exchange(url,+type,+new+HttpEntity<>(new+HttpHeaders()),+List.class);
++}|2743845|2743846|With授权：我喜欢小方法。因此，我将这些功能分离如下：|2743847|2743848|+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+"+%2B+new+String(Base64.encodeBase64((username+%2B+":"+%2B+password).getBytes())));
++++return+headers;
++}|2743849|希望这个问题能得到解决！|2743850|entityMap^0|4|3|0|0|0|0|A|0|0|3|D|0|0|3|E|0|0|0|0|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|L|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1J|8|@]|D|@]|E|$R|S]]|$1|T|3|U|5|6|7|1K|8|@$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|V|3|W|5|Q|7|1N|8|@]|D|@]|E|$R|S]]|$1|X|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|K|7|1P|8|@$9|1Q|A|1R|B|C]]|D|@]|E|$]]|$1|10|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]|$1|11|3|12|5|Q|7|1T|8|@]|D|@]|E|$R|S]]|$1|13|3|14|5|6|7|1U|8|@]|D|@]|E|$]]|$1|15|3|-4|5|6|7|1V|8|@]|D|@]|E|$]]]|16|$]]

An Easier Way: 
I will show you guys both with Authorization heard and without Authorization header: 
<ol>
<li>Without Authorization: 
a. Do Dependency Injection(Constructor Injection):
You can also prefer field injection. I considered constructor injection.</li>
</ol>
<pre><code>public class RestTemplateService {
private final RestTemplate template;
public RestTemplateService(RestTemplate template) {
 this.template = template;
 }
}
</code></pre>
b. Invoke getList() method:
<pre><code>public ResponseEntity&lt;List&gt; getResponseList(String url, HttpMethod type) {
 return template.exchange(url, type, new HttpEntity&lt;&gt;(new HttpHeaders()), List.class);
 }
</code></pre>
<ol start="2">
<li>With Authorization: I love small methods. So I segregated the functionalities as such:</li>
</ol>
<pre><code> public ResponseEntity&lt;List&gt; getResponse(String url, HttpMethod type) {
 return template.exchange(url, type, getRequest(getHeaders(USERNAME, PASS)), List.class);
 }

 private HttpEntity&lt;String&gt; getRequest(HttpHeaders headers) {
 return new HttpEntity&lt;&gt;(headers);
 }

 private HttpHeaders getHeaders(String username, String password) {
 HttpHeaders headers = new HttpHeaders();
 headers.add(&quot;Authorization&quot;, &quot;Basic &quot; + new String(Base64.encodeBase64((username + &quot;:&quot; + password).getBytes())));
 return headers;
 }

</code></pre>
 Hopefully the problem will be resolved!

I have two questions:

<ul>
<li>How to map a list of JSON objects using Spring RestTemplate.</li>
<li>How to map nested JSON objects.</li>
</ul>

I am trying to consume <a href="https://bitpay.com/api/rates">https://bitpay.com/api/rates</a>, by following the tutorial from <a href="http://spring.io/guides/gs/consuming-rest/">http://spring.io/guides/gs/consuming-rest/</a>.

Get list of JSON objects with Spring RestTemplate

JSON

Java

我有两个问题：Spring如何使用 RestTemplate.How映射对象列表以映射嵌套的JSON对象。通过遵循的教程，我正在尝试使用。

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