// 字符串转文件("测试文件内容", new File("D:/test.txt"));
public void 字符串转文件(String text, File file) {
    BufferedReader br = null;
    BufferedWriter bw = null;
    try {
        br = new BufferedReader(new StringReader(text));
        bw = new BufferedWriter(new FileWriter(file));
        char[] buf = new char[1024 * 64];          //字符缓冲区
        int len;
        while ((len = br.read(buf)) != -1) {
            bw.write(buf, 0, len);
        }
        bw.flush();
        br.close();
        bw.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}