从文件读写字符串的标准格式

java 代码

/**
 * Reads a text file to a String. The result String includes a '\n' after
 * each line in the file.
 *
 * @param fileName the name of the file to read
 * @return the content of the file in String format. The return String
 *         includes a '\n' after each line in the file.
 * @throws IOException any i/o error is encounted
 */
private String read(String fileName) throws IOException {
    StringBuffer sb = new StringBuffer();
    BufferedReader in = new BufferedReader(new FileReader(fileName));
    String currentLine;
    try {
        while ((currentLine = in.readLine()) != null) {
            sb.append(currentLine);
            sb.append("\n");
        }
    } finally {
        if (in != null)
            in.close();
    }
    return sb.toString();
}

/**
 * Writes a String to a file.
 *
 * @param fileName the file to write to
 * @param text the String to write
 * @throws IOException if any i/o error occurs
 */
private void write(String fileName, String text) throws IOException {
    PrintWriter out = null;
    try {
        out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
        out.print(text);
    } finally {
        if (out != null)
            out.close();
    }
}