@Test
    public void cleanDirectory() throws Exception {
        String filePath = System.getProperty("java.io.tmpdir") + File.separator
            + "FileTest" + 1;
        FileUtils.string2File(new File(filePath, "xx.tmp"), "helloworld!");
        Assert.assertTrue(new File(filePath, "xx.tmp").exists());

        String ct = FileUtils.file2String(new File(filePath, "xx.tmp"));
        Assert.assertTrue(ct.equals("helloworld!"));

        List<String> datas = FileUtils.readLines(new File(filePath, "xx.tmp"));
        Assert.assertTrue(datas.size() == 1);

        FileUtils.cleanDirectory(new File(filePath));
        Assert.assertFalse(new File(filePath).exists());
    }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
core/common/src/test/java/com/alipay/sofa/rpc/common/utils/FileUtilsTest.java