用jersey实现文件下载

发布一个k8s部署视频：https://edu.youkuaiyun.com/course/detail/26967

课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。

腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518

第二个视频发布  https://edu.youkuaiyun.com/course/detail/27109

腾讯课堂连接地址https://ke.qq.com/course/484107?tuin=ba64518

介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。

第三个视频发布：https://edu.youkuaiyun.com/course/detail/27574

详细介绍helm命令，学习helm chart语法，编写helm chart。深入分析各项目源码，学习编写helm插件

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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>