今天开发的时候遇到一个问题——当程序以jar包运行的时候,有个txt配置文件无法获取到,但是本地测试无法复现.后来发现是因为以Jar包形式运行,文件无法访问到,这里记录一下。
/** * 是否以Jar包运行 * * @return */public static boolean isRunningInJar() { try { String className = GenericUtils.class.getName().replace('.', '/'); String classJar = GenericUtils.class.getResource("/" + className + ".class").toString(); logger.info("classJar: " + classJar); return classJar.startsWith("jar:"); } catch (Exception e) { logger.warn("get Running status failed."); return false; }}
public static String txt2String(String fileName) { StringBuilder result = new StringBuilder(); BufferedReader br = null; try { Reader r = null; if (isRunningInJar()) { InputStream in = GenericUtils.class.getResourceAsStream(File.separator + fileName); r = new InputStreamReader(in); } else { String path = GenericUtils.class.getClassLoader().getResource(fileName).getPath(); File file = new File(path); r = new FileReader(file); } br = new BufferedReader(r);// 构造一个BufferedReader类来读取文件 String s = null; while ((s = br.readLine()) != null) {// 使用readLine方法,一次读一行 result.append(System.lineSeparator() + s); } } catch (Exception e) { logger.error("error when function:getTxtFromFile!", e); } finally { try { if (br != null) { br.close(); } } catch (final IOException ioe) { // ignore } } return result.toString();}
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