用jersey实现文件下载

DownloadResource .java
package cn.mykoo.ws.resources;
import java.io.File;
 import java.io.FileInputStream;import javax.servlet.ServletContext;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.Context;
 import javax.ws.rs.core.MediaType;import org.springframework.context.annotation.Scope;
 import org.springframework.stereotype.Component;import cn.mykoo.resource.Resource;
 import cn.mykoo.resource.ResourceService;import com.sun.jersey.api.core.InjectParam;
@Path("/download/{id}")
 @Component
 @Scope("request")
 public class DownloadResource {
  @InjectParam
  private ResourceService resourceService;
  @Context
  private ServletContext servletContext;
  
  @GET
  @Produces(MediaType.APPLICATION_OCTET_STREAM)
     public byte[] download(@PathParam("id") long id)throws Exception{
   //ApplicationContext ac=WebApplicationContextUtils.getWebApplicationContext(servletContext);
   //resourceService=(ResourceService)ac.getBean("resourceService");
   
   Resource resource=(Resource)resourceService.getObject(Resource.class, id);
   String path=servletContext.getRealPath(resource.getFilePath());
      FileInputStream fis=new FileInputStream(new File(path));
      byte [] b=new byte[fis.available()];
      fis.read(b);
      return b;
     }
  
  public ResourceService getResourceService() {
   return resourceService;
  }
  
  public void setResourceService(ResourceService resourceService) {
   this.resourceService = resourceService;
  } public ServletContext getServletContext() {
   return servletContext;
  } public void setServletContext(ServletContext servletContext) {
   this.servletContext = servletContext;
  }
  
 }web.xml
 
<?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5" 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_2_5.xsd​​​">
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>/WEB-INF/classes/applicationContext-*.xml</param-value>
     </context-param>    <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>    <filter>
         <filter-name>encodingFilter</filter-name>
         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
         <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name>encodingFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>
    
     <filter>
         <filter-name>AdminsFilter</filter-name>
         <filter-class>cn.webcell.utils.AdminsFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>AdminsFilter</filter-name>
         <url-pattern>/admins/*</url-pattern>
     </filter-mapping>    <filter>
         <filter-name>struts</filter-name>
         <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>struts</filter-name>
         <url-pattern>*.action</url-pattern>
     </filter-mapping>
    
     <servlet>
         <servlet-name>CheckCode</servlet-name>
         <servlet-class>cn.webcell.utils.CheckCode</servlet-class>
     </servlet>
     <servlet-mapping>
         <servlet-name>CheckCode</servlet-name>
         <url-pattern>/account/CheckCode</url-pattern>
     </servlet-mapping>    <servlet>
         <servlet-name>dwr-invoker</servlet-name>
         <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
         <init-param>
             <param-name>debug</param-name>
             <param-value>false</param-value>
         </init-param>
     </servlet>
     <servlet-mapping>
         <servlet-name>dwr-invoker</servlet-name>
         <url-pattern>/dwr/*</url-pattern>
     </servlet-mapping>
    
     <servlet>
         <servlet-name>JerseyServlet</servlet-name>
         <servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
         <init-param>
             <param-name>com.sun.jersey.config.property.packages</param-name>
             <param-value>cn.webcell.ws</param-value>
         </init-param>
     </servlet>
     <servlet-mapping>
         <servlet-name>JerseyServlet</servlet-name>
         <url-pattern>/ws/*</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>