如何从远程服务器为位于apache-tomcat WEB-INF / lib文件夹下的jar文件制作下载URL？

Question

谁能告诉我如何为jar文件创建下载链接，该文件位于apache-tomcat /WEB-INF/lib文件夹下。 我能够获得以下jar文件位置：

jar:file:/var/lib/tomcat7/webapps/cs/WEB-INF/lib/commons-fileupload-1.3.1.jar!/org/apache/commons/fileupload/disk/DiskFileItem.class

我想为此jar文件构建一个下载URL，以便可以将其从远程服务器下载到本地硬盘。

我有以下代码可找到Java版本：

public static Map<String, String> getJarVersions(ICS ics, ServletContext context)
  {

    ServletContextResource resource = new ServletContextResource(context, "/WEB-INF/lib/");

    File file = null;
    try
    {
      file = resource.getFile();
    }
    catch (IOException e)
    {
      log.error("Error reading /WEB-INF/lib/ directory. ", e);
      return new HashMap(0);
    }
    File[] jarFiles = file.listFiles();
    Map<String, String> jarNameVersion = new HashMap();
    File[] arr$ = jarFiles;int len$ = arr$.length;
    for (int i$ = 0; i$ < len$;)
    {
      File jarFile = arr$[i$];

      JarFile jarfile = null;
      Manifest manifest = null;
      try
      {
        jarfile = new JarFile(jarFile);
        manifest = jarfile.getManifest();
        if (manifest != null)
        {
          Attributes attrs = manifest.getMainAttributes();
          String version = attrs.getValue("Implementation-Version");
          String vendor = attrs.getValue("Implementation-Vendor");
          if (vendor == null) {
            vendor = "Not applicable";
          }
          if (version == null) {
            version = "Not applicable";
          }
          version = version + " : " + vendor;
          jarNameVersion.put(jarFile.getName(), version);
        }
        else
        {
          jarNameVersion.put(jarFile.getName());
        }
        if (jarfile != null) {
          try
          {
            jarfile.close();
          }
          catch (IOException e)
          {
            log.error("Error thrown while closing the jar file ");
          }
        }
        i$++;
      }
      catch (IOException e)
      {
        log.error("Error reading JAR/MANIFEST file . ", e);
      }
      finally
      {
        if (jarfile != null) {
          try
          {
            jarfile.close();
          }
          catch (IOException e)
          {
            log.error("Error thrown while closing the jar file ");
          }
        }
      }
    }
    return jarNameVersion;
  }
}

Answer 1

您无法直接访问WEB-INF文件夹下的任何资源，因为它受到Tomcat的保护，无法访问URL。

如果您需要从WEB-INF中访问任何资源，则应该构建一个Java组件（servlet，过滤器，控制器等）来访问此WEB-INF元素并返回它们。