guava-io

GUAVA IO 對不少IO的讀寫操做進行了封裝,大大減小了io的讀寫操做

1.public static List<String> readLines(File file, Charset charset): 將文件中的文字以BufferedReader.readline的方式讀取成一行行字符串
@Test
    public void testFiles() throws IOException {
        String fileName = "/Users/jiabei/Downloads/CLEARING.sql";
        File file = new File(fileName);
        List<String> result = Files.readLines(file, Charsets.UTF_8);
    }
2.public static <T> T readLines(File file, Charset charset, LineProcessor<T> callback):讀取文件並按照自定義回調方法處理讀取的行數據
@Test
    public void testFiles() throws IOException {
        String fileName ="/Users/jiabei/Downloads/CLEARING.sql";
        File file = new File(fileName);
        List<Source> list = Files.readLines(file, Charsets.UTF_8, new LineProcessor<List<Source>>() {
            private ArrayList<Source> list = Lists.newArrayList();
            @Override
            public boolean processLine(String s) throws IOException {
                if(s.contains("/*")){
                    Source source = new Source();
                    source.setName(s);
                    list.add(source);
                }
                return true;
            }
            @Override
            public List<Source> getResult() {
                return this.list;
            }

        });
        for (Source source : list) {
            System.out.println(source.getName());
        }
    }
3.public static void copy(File from, File to):文件複製
@Test
    public void testFiles() throws IOException {
        String fileName ="/Users/jiabei/Downloads/CLEARING.sql";
        File file = new File(fileName);
        Files.copy(file,new File("/Users/jiabei/Downloads/to.sql"));
    }

4.public static void move(File from, File to):移動文件到目標路徑
@Test
    public void testFiles() throws IOException {
        String fileName = "/Users/jiabei/Downloads/CLEARING.sql";
        File file = new File(fileName);
        Files.move(file, new File("/Users/jiabei/Downloads/to.sql"));
    }
5.public static ByteSource asByteSource(File file):將file轉換爲字節數組,兩種方式
@Test
    public void testFiles() throws IOException {
        String fileName ="/Users/jiabei/Downloads/CLEARING.sql";
        File file = new File(fileName);
        ByteSource byteSource = Files.asByteSource(file);
        byte[] read = byteSource.read();
        String string = new java.lang.String(read);
        System.out.println(string);
    }