JAX RS 2 使用 Jersey 客户端获取"HTTP 404 未找到但相同的 URL 正在浏览器上运行 [英] JAX RS 2 using Jersey client getting " HTTP 404 Not found " but same URL is working on browser

问题描述

我是 JAX RS 和 Jersey 2 的新手.我的简单休息资源服务器端程序Hello World"运行良好，我可以通过任何浏览器和谷歌浏览器的 Advance Rest Client 应用程序访问它.

I am new to JAX RS and Jersey 2. My simple rest resource server side program "Hello World" is working fine and I am able to access it by any browser and Advance Rest Client application of google chrome.

但是当我编写了一个 JAX RS Jersey 2 客户端时，它给了我 HTTP 404 Not found，下面是详细信息:

But when I have written a JAX RS Jersey 2 client it is giving me HTTP 404 Not found, Below are the details:

下面是rest资源服务器端程序:

Below is rest resource server side program:

http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">ProJrsRi_HelloRest2

http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> ProJrsRi_HelloRest2

<servlet>
    <servlet-name>jersey</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>com.sun.jersey.config.property.packages</param-name>
        <param-value>com</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>jersey</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

package     com;
import     javax.ws.rs.GET;
import     javax.ws.rs.Path;


@Path("hello")
public class HelloRest {

    @GET()
    public  String sayHello(){
    return "Welcome to the world of REST";
    }
}

我的服务器端 Jar 文件列表

asm-3.1.jar
jackson-core-asl-1.9.2.jar
jackson-jaxrs-1.9.2.jar
jackson-mapper-asl-1.9.2.jar
jackson-xc-1.9.2.jar
jersey-client-1.18.jar
jersey-core-1.18.jar
jersey-json-1.18.jar
jersey-server-1.18.jar
jersey-servlet-1.18.jar
jettison-1.1.jar

在浏览器中运行良好.

 package userCoreJava;

 import java.net.URI;
 import java.net.URISyntaxException;

 import javax.ws.rs.client.Client;
 import javax.ws.rs.client.ClientBuilder;
 import javax.ws.rs.client.Invocation.Builder;
 import javax.ws.rs.client.WebTarget;
 import javax.ws.rs.core.Response;



 public class UsingJersey {
    public static void main(String[] args) {
        Client client = ClientBuilder.newClient();
        WebTarget target=null;
        try {
            target = client.target(new URI("http://localhost:8080/ProJrsRi_HelloRest2/rest/hello"));
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        Builder builder =   target.request();
        //Response response  = builder.get();
        String result  = builder.get(String.class);
        System.out.println(target.getUri().toString());
        System.out.println("Result=" + result);

    }
 }

客户端的罐子列表:

asm-all-repackaged-2.2.0-b21.jar
cglib-2.2.0-b21.jar
guava-14.0.1.jar
hk2-api-2.2.0-b21.jar
hk2-locator-2.2.0-b21.jar
hk2-utils-2.2.0-b21.jar
javax.annotation-api-1.2.jar
javax.inject-2.2.0-b21.jar
javax.servlet-api-3.0.1.jar
javax.ws.rs-api-2.0.jar
jaxb-api-2.2.7.jar
jersey-client.jar
jersey-common.jar
jersey-container-servlet-core.jar
jersey-container-servlet.jar
jersey-server.jar
org.osgi.core-4.2.0.jar
osgi-resource-locator-1.0.1.jar
persistence-api-1.0.jar
validation-api-1.1.0.Final.jar 

但是当我运行这个 main 方法得到 404 异常如下:

    Exception in thread "main" javax.ws.rs.NotFoundException: HTTP 404 Not found
    at org.glassfish.jersey.client.JerseyInvocation.convertToException(JerseyInvocation.java:917)
    at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:770)
    at org.glassfish.jersey.client.JerseyInvocation.access$500(JerseyInvocation.java:90)
    at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:671)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:422)
    at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:667)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:396)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:296)
    at userCoreJava.UsingJersey.main(UsingJersey.java:25)

请帮我解决这个问题，我卡住了.

Please Help me to fix this issue, I stuck in it.

推荐答案

你应该进一步研究 Jersey 客户端的 API 文档(https://jersey.java.net/documentation/latest/user-guide.html#client).乍一看，您似乎在定义 WebTarget 时犯了一个错误，即您需要定义 target(Web 服务端点)，然后是 resource(你想与之交互的特定资源)，所以你应该有这样的东西:

You should further study the API documentation for Jersey client (https://jersey.java.net/documentation/latest/user-guide.html#client). In a first glance you seem to be making a mistake on defining the WebTarget, namely you need to define the target (web service endpoint) and then the resource (specific resource you want to interact with), so you should have something like this:

Client client = ClientBuilder.newClient();
WebTarget target = client
    .target("http://localhost:8080/ProJrsRi_HelloRest2/rest").path("hello");

可能这就是为什么您可以在浏览器上看到结果但在 Java 应用程序中看不到的原因...

Probably this is the reason why you can see the results on browser but not in your Java application...

您还可以在文档中找到一些非常好的代码示例.

You can also find some very good examples of code in the documentation.

HTH.

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