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//reference: http://bit.ly/2EuoV6X

//这个slurp版本需要jdk1.7以上
public static String slurp(String filename) {
            File f = new File(filename);
            try {
                byte[] bytes = Files.readAllBytes(f.toPath());
                return new String(bytes,"UTF-8");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return "";
    }

public static String slurp(String file) {
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader(file));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        String         line = null;
        StringBuilder  stringBuilder = new StringBuilder();
        String         ls = System.getProperty("line.separator");

        try {
            while((line = reader.readLine()) != null) {
                stringBuilder.append(line);
                stringBuilder.append(ls);
            }

            return stringBuilder.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return "";
    }