[英]PATCH request using Jersey Client
我想執行我們的服務器支持的 PATCH 請求,以便使用 Jersey 客戶端進行測試。 我的代碼如下,但我得到com.sun.jersey.api.client.ClientHandlerException: java.net.ProtocolException: HTTP method PATCH doesn't support output
exception。 有人可以讓我知道下面的代碼有什么問題嗎?
String complete_url = "http://localhost:8080/api/request";
String request = "[{\"op\":\"add\", \"path\":\"/name\", \"value\":\"Hello\"}]";
DefaultClientConfig config = new DefaultClientConfig();
config.getProperties().put(URLConnectionClientHandler.PROPERTY_HTTP_URL_CONNECTION_SET_METHOD_WORKAROUND, true);
Client client = Client.create(config);
WebResource resource = client.resource(complete_url);
ClientResponse response = resource.header("Authorization", "Basic xyzabCDef")
.type(new MediaType("application", "json-patch+json"))
.method("PATCH", ClientResponse.class, request);
這是完整的例外,
com.sun.jersey.api.client.ClientHandlerException: java.net.ProtocolException: HTTP method PATCH doesn't support output
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:155)
at com.sun.jersey.api.client.Client.handle(Client.java:652)
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682)
at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
at com.sun.jersey.api.client.WebResource$Builder.method(WebResource.java:634)
at com.acceptance.common.PatchTest.patch(PatchTest.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.net.ProtocolException: HTTP method PATCH doesn't support output
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1021)
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler$1$1.getOutputStream(URLConnectionClientHandler.java:238)
at com.sun.jersey.api.client.CommittingOutputStream.commitStream(CommittingOutputStream.java:117)
at com.sun.jersey.api.client.CommittingOutputStream.write(CommittingOutputStream.java:89)
at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:202)
at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:272)
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:276)
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122)
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212)
at java.io.BufferedWriter.flush(BufferedWriter.java:236)
at com.sun.jersey.core.util.ReaderWriter.writeToAsString(ReaderWriter.java:191)
at com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider.writeToAsString(AbstractMessageReaderWriterProvider.java:128)
at com.sun.jersey.core.impl.provider.entity.StringProvider.writeTo(StringProvider.java:88)
at com.sun.jersey.core.impl.provider.entity.StringProvider.writeTo(StringProvider.java:58)
at com.sun.jersey.api.client.RequestWriter.writeRequestEntity(RequestWriter.java:300)
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:217)
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:153)
僅供參考 - 以防萬一有人在 Jersey 2 中遇到此問題,請參閱HttpUrlConnectorProvider 文檔
並使用 SET_METHOD_WORKAROUND 屬性如下:
Client jerseyClient = ClientBuilder.newClient()
.property(HttpUrlConnectorProvider.SET_METHOD_WORKAROUND, true)
... etc ...
我花了很長時間才找到這個 - 認為我可以幫助縮短其他人的學習曲線。
如果您使用的是HttpsUrlConnection
(注意's' ) - 那么設置HttpUrlConnectorProvider.SET_METHOD_WORKAROUND
將不起作用。 繼續閱讀以獲取詳細的解決方案。
就我而言,設置HttpUrlConnectorProvider.SET_METHOD_WORKAROUND
屬性會導致NoSuchFieldException
因為我的HttpUrlConnection
實例實際上是類型: sun.net.www.protocol.https.HttpsURLConnectionImpl
並且它是超級: javax.net.ssl.HttpsURLConnection
(從HttpUrlConnection
繼承)。
因此,當 Jackson 代碼嘗試從我的連接實例 super( javax.net.ssl.HttpsURLConnection
實例)獲取方法字段時:
/**
* Workaround for a bug in {@code HttpURLConnection.setRequestMethod(String)}
* The implementation of Sun/Oracle is throwing a {@code ProtocolException}
* when the method is other than the HTTP/1.1 default methods. So to use {@code PROPFIND}
* and others, we must apply this workaround.
*
* See issue http://java.net/jira/browse/JERSEY-639
*/
private static void setRequestMethodViaJreBugWorkaround(final HttpURLConnection httpURLConnection, final String method) {
try {
httpURLConnection.setRequestMethod(method); // Check whether we are running on a buggy JRE
} catch (final ProtocolException pe) {
try {
final Class<?> httpURLConnectionClass = httpURLConnection.getClass();
AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws NoSuchFieldException, IllegalAccessException {
final Field methodField = httpURLConnectionClass.getSuperclass().getDeclaredField("method");
methodField.setAccessible(true);
methodField.set(httpURLConnection, method);
return null;
}
});
} catch (final PrivilegedActionException e) {
final Throwable cause = e.getCause();
if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
} else {
throw new RuntimeException(cause);
}
}
}
}
我們得到一個NoSuchFieldException
,表明一個名為method
的字段不存在(因為 getDeclaredFields() 帶來了所有字段,無論它們的可訪問性如何,但僅適用於當前類,而不是當前類可能繼承的任何基類)。
所以我查看了 Java 的 HttpUrlConnection 代碼,發現允許的方法是由私有靜態String[] 指定的:
/* Adding PATCH to the valid HTTP methods */
private static final String[] methods = {
"GET", "POST", "HEAD", "OPTIONS", "PUT", "DELETE", "TRACE"
};
解決方案是使用反射更改此方法數組:
try {
Field methodsField = HttpURLConnection.class.getDeclaredField("methods");
methodsField.setAccessible(true);
// get the methods field modifiers
Field modifiersField = Field.class.getDeclaredField("modifiers");
// bypass the "private" modifier
modifiersField.setAccessible(true);
// remove the "final" modifier
modifiersField.setInt(methodsField, methodsField.getModifiers() & ~Modifier.FINAL);
/* valid HTTP methods */
String[] methods = {
"GET", "POST", "HEAD", "OPTIONS", "PUT", "DELETE", "TRACE", "PATCH"
};
// set the new methods - including patch
methodsField.set(null, methods);
} catch (SecurityException | IllegalArgumentException | IllegalAccessException | NoSuchFieldException e) {
e.printStackTrace();
}
由於 methods 字段是靜態的,因此更改其值適用於擴展HttpUrlConnection
任何具體實例,包括HttpsUrlConnection
。
旁注:我更喜歡 Java 將 PATCH 方法添加到 JDK 或從 Jackson 添加到他們的解決方法中的整個層次結構中執行字段查找。
無論如何,我希望這個解決方案可以為您節省一些時間。
這是當前 JDK 實現中的一個錯誤,已在 JDK8 實現中修復。查看此鏈接了解詳細信息https://bugs.openjdk.java.net/browse/JDK-7157360 。 有一種方法可以解決這個問題,但 Jersey 團隊決定不修復它https://github.com/eclipse-ee4j/jersey/issues/1639
我能想到的2個解決方案
簡單的答案是:
依賴關系
<!-- https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-client -->
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>2.27</version>
</dependency>
需要添加HttpUrlConnectorProvider.SET_METHOD_WORKAROUND
= true
Client client = ClientBuilder.newClient(clientConfig).property(HttpUrlConnectorProvider.SET_METHOD_WORKAROUND, true);
要求
client.target("base_url").path("end_point").request().headers("your_headers")
.build("PATCH", Entity.entity("body_you_want_to_pass", "content-type"))
.invoke();
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