Question

Appache HTTP Components库似乎可以正常与常规网站通信，但无法连接到网络服务。

我正在构建要在Java桌面应用程序中运行的组件，该应用程序将使用Jersey框架与Web Service-REST进行通信。 Web服务正在运行，我可以使用我的Web浏览器和netbeans中的Test-Web-Service功能进行通信。

如果我尝试从常规网页或甚至是我机器上运行的Glassfish Web服务器的默认页面读取，客户端代码工作正常。为什么当我尝试使用我的客户端程序（下面的代码）访问Web服务时，我是否从Web服务器收到404 Not Found错误？

import java.io.*;
import org.apache.http.*;
import org.apache.http.client.*;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.client.methods.*;  //HttpHead, HttpPut, HttpGet, etc...
import org.apache.http.util.EntityUtils;

public class ApacheClientDemo {

  public static void demo() throws IOException {           
     String uri = "http://localhost:8080/Proctorest/resources/helloWorld";
     HttpClient httpclient = new DefaultHttpClient();
     HttpGet httpget = new HttpGet(uri);
     HttpResponse response = httpclient.execute(httpget);
     System.out.println(response.getStatusLine().toString());
     HttpEntity entity = response.getEntity();
     System.out.println();
     System.out.println(EntityUtils.toString(entity));       
  }

  public static void main(String[] args) {
    try {
        demo();
    }
    catch(IOException ioe) {
        System.out.println(ioe);
    }
  }
}

当在线访问常规网站或本地托管的非网络服务网站时，输出

 HTTP/1.1 200 OK

其次是网页内容。

上面的代码给了我

  HTTP/1.1 404 Not Found

编辑：以下是Web服务的代码。 Web服务代码是从Netbeans示例项目生成的。 Netbeans Sample Web Service project

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*/

package helloworld;

import javax.ejb.EJB;
import javax.ejb.Stateless;

import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Produces;
import javax.ws.rs.Consumes;

/**
* REST Web Service
*
* @author mkuchtiak
*/

@Stateless
@Path("/helloWorld")
public class HelloWorldResource {

    @EJB
    private NameStorageBean nameStorage;
    /**
    * Retrieves representation of an instance of helloworld.HelloWorldResource
    * @return an instance of java.lang.String
    */
    @GET
    @Produces("text/html")
    public String getXml() {
        return "<html><body><h1>Hello "+nameStorage.getName()+"!</h1></body></html>";
    }

    /**
    * PUT method for updating an instance of HelloWorldResource
    * @param content representation for the resource
    * @return an HTTP response with content of the updated or created resource.
    */
    @PUT
    @Consumes("text/plain")
    public void putXml(String content) {
        nameStorage.setName(content);
    }
}

/////////// NameStorageBean .java

import javax.ejb.Singleton;

/** Singleton session bean used to store the name parameter for "/helloWorld" resource
*
* @author mkuchtiak
*/
@Singleton
public class NameStorageBean {

    // name field
    private String name = "World";

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

Answer 1

我无法看到您如何部署该服务。

尝试改变（骆驼案例对于服务来说是不常见的）

String uri = "http://localhost:8080/Proctorest/resources/helloWorld";

小写“helloworld”

String uri = "http://localhost:8080/Proctorest/resources/helloworld";

或尝试

String uri = "http://localhost:8080/helloworld";

如何获得路线

<强> U：... \ HelloWorld1 \ HelloWorld1 \网络\ WEB-INF \ sun-web.xml中

<sun-web-app error-url="">
  <context-root>/HW</context-root>
  <class-loader delegate="true"/>
  <jsp-config>
    <property name="keepgenerated" value="true">
      <description>Keep a copy of the generated servlet class' java code.</description>
    </property>
  </jsp-config>
</sun-web-app>

a）// {localhost：8080 / HW 来自<context-root>/HW</context-root>

<强> U：... \ HelloWorld1 \ HelloWorld1 \网络\ WEB-INF \ web.xml中

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <servlet>
        <servlet-name>ServletAdaptor</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServletAdaptor</servlet-name>
        <url-pattern>/hw/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

b）// {localhost：8080 / HW / hw 来自<url-pattern>/hw/*</url-pattern>

<强> U：.... \ HelloWorld1 \ HelloWorld1 \ SRC \ java的\的HelloWorld \ HelloWorldResource.java

.....
/**
 * REST Web Service
 *
 * @author mkuchtiak
 */

@Stateless
@Path("/helloworld")
public class HelloWorldResource {
....

c）// {localhost：8080 / HW / hw / helloworld 来自@Path("/helloworld")

将a）b）c）三个文件中的部分放在一起。

注意：网址显示错误，只有/ HW正确

...
    Incrementally deploying HelloWorld1
    Completed incremental distribution of HelloWorld1
    run-deploy:
    Browsing: http://localhost:8080/HW/resources/helloWorld
...

....
public static void demo() throws IOException {           
     String uri = "http://localhost:8080/HW/hw/helloworld";
     HttpClient httpclient = new DefaultHttpClient();
     HttpGet httpget = new HttpGet(uri);
     HttpResponse response = httpclient.execute(httpget);
     System.out.println(response.getStatusLine().toString());
     HttpEntity entity = response.getEntity();
     System.out.println();
     System.out.println(EntityUtils.toString(entity));       
  }
....

输出

debug:
HTTP/1.1 200 OK

<html><body><h1>Hello World!</h1></body></html>

使用apache HttpClient连接到Web服务

1 个答案: