文件拷贝工具类

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.1.RELEASE</version>
        </dependency>

    @Test
    public void tt() throws IOException{
        FileCopyUtils.copy(new File("E:\\abc.txt"), new File("E:\\abcd.txt"));
    }