RestTemplate PATCH 请求
RestTemplate PATCH request
我对 PersonDTO 的定义如下：
public class PersonDTO
{
private String id
private String firstName;
private String lastName;
private String maritalStatus;
}
这是一个示例记录：
{
"id": 1,
"firstName": "John",
"lastName": "Doe",
"maritalStatus": "married"
}
现在，John Doe 离婚了。所以我需要向这个 URL:
发送一个 PATCH 请求
http://localhost:8080/people/1
具有以下请求正文：
{
"maritalStatus": "divorced"
}
我不知道该怎么做。到目前为止，这是我尝试过的：
// Create Person
PersonDTO person = new PersonDTO();
person.setMaritalStatus("Divorced");
// Create HttpEntity
final HttpEntity<ObjectNode> requestEntity = new HttpEntity<>(person);
// Create URL (for eg: localhost:8080/people/1)
final URI url = buildUri(id);
ResponseEntity<Void> responseEntity = restTemplate.exchange(url, HttpMethod.PATCH, requestEntity, Void.class);
上面的问题如下：
1) 因为我只设置了MaritalStatus，所以其他字段都为null。因此，如果我打印出请求，它将如下所示：
{
"id": null,
"firstName": "null",
"lastName": "null",
"maritalStatus": "married" // I only need to update this field.
}
这是否意味着我必须在执行 PATCH 之前执行 GET？
2) 我得到以下堆栈跟踪：
08:48:52.717 ERROR c.n.d.t.s.PersonServiceImpl - Unexpected Exception :
org.springframework.web.client.ResourceAccessException: I/O error on PATCH request for "http://localhost:8080/people/1":Invalid HTTP method: PATCH; nested exception is java.net.ProtocolException: Invalid HTTP method: PATCH
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:580) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:545) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:466) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at com.sp.restclientexample..service.PersonServiceImpl.doPatch(PersonServiceImpl.java:75) ~[classes/:na]
at com.sp.restclientexample..service.PatchTitle.itDoPatch(PatchTitle.java:53) [test-classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_20]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_20]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_20]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_20]
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:50) [junit-4.12.jar:4.12]
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) [junit-4.12.jar:4.12]
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.junit.runners.ParentRunner.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.access[=16=]0(ParentRunner.java:58) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) [.cp/:na]
Caused by: java.net.ProtocolException: Invalid HTTP method: PATCH
at java.net.HttpURLConnection.setRequestMethod(HttpURLConnection.java:440) ~[na:1.8.0_20]
at sun.net.www.protocol.http.HttpURLConnection.setRequestMethod(HttpURLConnection.java:517) ~[na:1.8.0_20]
at org.springframework.http.client.SimpleClientHttpRequestFactory.prepareConnection(SimpleClientHttpRequestFactory.java:209) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:138) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:76) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:565) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 33 common frames omitted
感谢编写客户端应用程序以使用 Spring 的 RestTemplate 使用 Restful 网络服务的人们的任何指示。
为了完整起见，我还要声明我们使用 SpringDataRest 作为后端 restful 网络服务。
SGB
我通过向我的 restTemplate 实例添加一个新的 HttpRequestFactory 解决了这个问题。像这样
RestTemplate restTemplate = new RestTemplate();
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
requestFactory.setConnectTimeout(TIMEOUT);
requestFactory.setReadTimeout(TIMEOUT);
restTemplate.setRequestFactory(requestFactory);
对于 TestRestTemplate，添加
@Autowired
private TestRestTemplate restTemplate;
@Before
public void setup() {
restTemplate.getRestTemplate().setRequestFactory(new HttpComponentsClientHttpRequestFactory());
}
PS: 您需要在项目中添加 httpClient 组件
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4.1</version>
</dependency>
对于 RestTemplate 是从 RestTemplateBuilder 构建的情况，自定义 RestClient 的构造函数可以写成
public PersonRestClient(RestTemplateBuilder restTemplateBuilder) {
this.restTemplate = restTemplateBuilder.requestFactory(new HttpComponentsClientHttpRequestFactory()).build();
}
此外，org.apache.httpcomponents.httpclient 依赖项需要添加到 pom.xml 文件中。
如果您的 spring 版本早于 3.1.0，那么您在 HttpMethods 中没有 PATCH 方法。您仍然可以使用 apache 中的 HttpClient。这是一个简短的例子，说明我是如何做到的：
try {
//This is just to avoid ssl hostname verification and to trust all, you can use simple Http client also
CloseableHttpClient httpClient = HttpClientBuilder.create().setSSLContext(new SSLContextBuilder().loadTrustMaterial(null, TrustAllStrategy.INSTANCE).build())
.setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).build();
HttpPatch request = new HttpPatch(REST_SERVICE_URL);
StringEntity params = new StringEntity(JSON.toJSONString(payload), ContentType.APPLICATION_JSON);
request.setEntity(params);
request.addHeader(org.apache.http.HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
request.addHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);
//You can use other authorization method, like user credentials
request.addHeader(HttpHeaders.AUTHORIZATION, OAuth2AccessToken.BEARER_TYPE + " " + accessToken);
HttpResponse response = httpClient.execute(request);
String statusCode = response.getStatusLine().getStatusCode();
} catch (Exception ex) {
// handle exception here
}
与 RestTemplate 等效的是：
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.add("Authorization", OAuth2AccessToken.BEARER_TYPE + " " + accessToken);
final HttpEntity<String> entity = new HttpEntity<String>(JSON.toJSONString(payload), headers);
RestTemplate restTemplate = new RestTemplate();
try {
ResponseEntity<String> response = restTemplate.exchange(REST_SERVICE_URL, HttpMethod.PATCH, entity, String.class);
String statusCode = response.getStatusCode();
} catch (HttpClientErrorException e) {
// handle exception here
}
此外，请确保负载仅包含您需要更改的值，并确保您将请求发送到正确的 URL。 （在某些情况下，这可能以 /api/guest/{id} 结尾）
当涉及链接资源时，我创建了一个通用方法来执行此操作：
public void patch(M theEntity, Integer entityId, String linkName, URI linkUri) {
ObjectMapper objectMapper = getObjectMapperWithHalModule();
ObjectNode linkedNode = (ObjectNode) objectMapper.valueToTree(theEntity);
linkedNode.put(linkName, linkUri.getPath());
HttpEntity<ObjectNode> requestEntity = new HttpEntity<>(linkedNode);
restTemplate.exchange(uri + "/" + entityId, HttpMethod.PATCH, requestEntity, Void.class);
}
private ObjectMapper getObjectMapperWithHalModule() {
if(objectMapperHal == null) {
objectMapperHal = new ObjectMapper();
objectMapperHal.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapperHal.registerModule(new Jackson2HalModule());
}
return objectMapperHal;
}
查看此示例的实现
我在 java 文件中添加了以下代码。它对我有用。
String url="Your API URL";
RestTemplate restTemplate = new RestTemplate();
HttpClient httpClient = HttpClientBuilder.create().build();
restTemplate.setRequestFactory(new
HttpComponentsClientHttpRequestFactory(httpClient));
HttpHeaders reqHeaders = new HttpHeaders();
reqHeaders.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> requestEntity = new HttpEntity<String>(requestJson, reqHeaders);
ResponseEntity<String> responseEntity=restTemplate.exchange(url, HttpMethod.PATCH,
requestEntity, String.class);
此外，需要在 pom.xml 文件中添加以下依赖项。
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
对我来说，通过添加以下行解决了问题：
restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());
我对 PersonDTO 的定义如下：
public class PersonDTO
{
private String id
private String firstName;
private String lastName;
private String maritalStatus;
}
这是一个示例记录：
{
"id": 1,
"firstName": "John",
"lastName": "Doe",
"maritalStatus": "married"
}
现在，John Doe 离婚了。所以我需要向这个 URL:
发送一个 PATCH 请求http://localhost:8080/people/1
具有以下请求正文：
{
"maritalStatus": "divorced"
}
我不知道该怎么做。到目前为止，这是我尝试过的：
// Create Person
PersonDTO person = new PersonDTO();
person.setMaritalStatus("Divorced");
// Create HttpEntity
final HttpEntity<ObjectNode> requestEntity = new HttpEntity<>(person);
// Create URL (for eg: localhost:8080/people/1)
final URI url = buildUri(id);
ResponseEntity<Void> responseEntity = restTemplate.exchange(url, HttpMethod.PATCH, requestEntity, Void.class);
上面的问题如下：
1) 因为我只设置了MaritalStatus，所以其他字段都为null。因此，如果我打印出请求，它将如下所示：
{
"id": null,
"firstName": "null",
"lastName": "null",
"maritalStatus": "married" // I only need to update this field.
}
这是否意味着我必须在执行 PATCH 之前执行 GET？
2) 我得到以下堆栈跟踪：
08:48:52.717 ERROR c.n.d.t.s.PersonServiceImpl - Unexpected Exception :
org.springframework.web.client.ResourceAccessException: I/O error on PATCH request for "http://localhost:8080/people/1":Invalid HTTP method: PATCH; nested exception is java.net.ProtocolException: Invalid HTTP method: PATCH
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:580) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:545) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:466) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at com.sp.restclientexample..service.PersonServiceImpl.doPatch(PersonServiceImpl.java:75) ~[classes/:na]
at com.sp.restclientexample..service.PatchTitle.itDoPatch(PatchTitle.java:53) [test-classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_20]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_20]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_20]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_20]
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:50) [junit-4.12.jar:4.12]
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) [junit-4.12.jar:4.12]
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.junit.runners.ParentRunner.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.access[=16=]0(ParentRunner.java:58) [junit-4.12.jar:4.12]
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) [.cp/:na]
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) [.cp/:na]
Caused by: java.net.ProtocolException: Invalid HTTP method: PATCH
at java.net.HttpURLConnection.setRequestMethod(HttpURLConnection.java:440) ~[na:1.8.0_20]
at sun.net.www.protocol.http.HttpURLConnection.setRequestMethod(HttpURLConnection.java:517) ~[na:1.8.0_20]
at org.springframework.http.client.SimpleClientHttpRequestFactory.prepareConnection(SimpleClientHttpRequestFactory.java:209) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:138) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:76) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:565) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 33 common frames omitted
感谢编写客户端应用程序以使用 Spring 的 RestTemplate 使用 Restful 网络服务的人们的任何指示。
为了完整起见，我还要声明我们使用 SpringDataRest 作为后端 restful 网络服务。
SGB
我通过向我的 restTemplate 实例添加一个新的 HttpRequestFactory 解决了这个问题。像这样
RestTemplate restTemplate = new RestTemplate();
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
requestFactory.setConnectTimeout(TIMEOUT);
requestFactory.setReadTimeout(TIMEOUT);
restTemplate.setRequestFactory(requestFactory);
对于 TestRestTemplate，添加
@Autowired
private TestRestTemplate restTemplate;
@Before
public void setup() {
restTemplate.getRestTemplate().setRequestFactory(new HttpComponentsClientHttpRequestFactory());
}
PS: 您需要在项目中添加 httpClient 组件
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4.1</version>
</dependency>
对于 RestTemplate 是从 RestTemplateBuilder 构建的情况，自定义 RestClient 的构造函数可以写成
public PersonRestClient(RestTemplateBuilder restTemplateBuilder) {
this.restTemplate = restTemplateBuilder.requestFactory(new HttpComponentsClientHttpRequestFactory()).build();
}
此外，org.apache.httpcomponents.httpclient 依赖项需要添加到 pom.xml 文件中。
如果您的 spring 版本早于 3.1.0，那么您在 HttpMethods 中没有 PATCH 方法。您仍然可以使用 apache 中的 HttpClient。这是一个简短的例子，说明我是如何做到的：
try {
//This is just to avoid ssl hostname verification and to trust all, you can use simple Http client also
CloseableHttpClient httpClient = HttpClientBuilder.create().setSSLContext(new SSLContextBuilder().loadTrustMaterial(null, TrustAllStrategy.INSTANCE).build())
.setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).build();
HttpPatch request = new HttpPatch(REST_SERVICE_URL);
StringEntity params = new StringEntity(JSON.toJSONString(payload), ContentType.APPLICATION_JSON);
request.setEntity(params);
request.addHeader(org.apache.http.HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
request.addHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE);
//You can use other authorization method, like user credentials
request.addHeader(HttpHeaders.AUTHORIZATION, OAuth2AccessToken.BEARER_TYPE + " " + accessToken);
HttpResponse response = httpClient.execute(request);
String statusCode = response.getStatusLine().getStatusCode();
} catch (Exception ex) {
// handle exception here
}
与 RestTemplate 等效的是：
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.add("Authorization", OAuth2AccessToken.BEARER_TYPE + " " + accessToken);
final HttpEntity<String> entity = new HttpEntity<String>(JSON.toJSONString(payload), headers);
RestTemplate restTemplate = new RestTemplate();
try {
ResponseEntity<String> response = restTemplate.exchange(REST_SERVICE_URL, HttpMethod.PATCH, entity, String.class);
String statusCode = response.getStatusCode();
} catch (HttpClientErrorException e) {
// handle exception here
}
此外，请确保负载仅包含您需要更改的值，并确保您将请求发送到正确的 URL。 （在某些情况下，这可能以 /api/guest/{id} 结尾）
当涉及链接资源时，我创建了一个通用方法来执行此操作：
public void patch(M theEntity, Integer entityId, String linkName, URI linkUri) {
ObjectMapper objectMapper = getObjectMapperWithHalModule();
ObjectNode linkedNode = (ObjectNode) objectMapper.valueToTree(theEntity);
linkedNode.put(linkName, linkUri.getPath());
HttpEntity<ObjectNode> requestEntity = new HttpEntity<>(linkedNode);
restTemplate.exchange(uri + "/" + entityId, HttpMethod.PATCH, requestEntity, Void.class);
}
private ObjectMapper getObjectMapperWithHalModule() {
if(objectMapperHal == null) {
objectMapperHal = new ObjectMapper();
objectMapperHal.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapperHal.registerModule(new Jackson2HalModule());
}
return objectMapperHal;
}
我在 java 文件中添加了以下代码。它对我有用。
String url="Your API URL";
RestTemplate restTemplate = new RestTemplate();
HttpClient httpClient = HttpClientBuilder.create().build();
restTemplate.setRequestFactory(new
HttpComponentsClientHttpRequestFactory(httpClient));
HttpHeaders reqHeaders = new HttpHeaders();
reqHeaders.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> requestEntity = new HttpEntity<String>(requestJson, reqHeaders);
ResponseEntity<String> responseEntity=restTemplate.exchange(url, HttpMethod.PATCH,
requestEntity, String.class);
此外，需要在 pom.xml 文件中添加以下依赖项。
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
对我来说，通过添加以下行解决了问题：
restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());