将Jar包中的文件拷贝到本地文件

最新推荐文章于 2024-02-02 17:59:47 发布

原创最新推荐文章于 2024-02-02 17:59:47 发布 · 1.9k 阅读

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本文介绍了一种从JAR文件中读取指定路径资源并将其复制到目标位置的方法。该方法使用Spring框架中的`PathMatchingResourcePatternResolver`类解析CLASSPATH下的资源，并通过输入输出流完成文件复制。

protected void copyFileFromJar(String fileRegex, String strDestFileName) {
       ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
       String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + fileRegex;

       try {
           Resource[] resources = resourcePatternResolver.getResources(pattern);

           if(resources!=null && resources.length>0) {
               Resource res = resources[0];
               InputStream fis = res.getInputStream();
               OutputStream fos = new FileOutputStream(strDestFileName);
               byte[] bArrBuffer = new byte[BUFFER_SIZE];
               int iCount = 0;

               while ((iCount = fis.read(bArrBuffer, 0, bArrBuffer.length)) != -1) {
                   fos.write(bArrBuffer, 0, iCount);
               }

               fis.close();
               fos.close();
           }
       } catch (IOException e) {
       }
   }