Possible Duplicate:
How to append text to an existing file in Java




如何在.txt文件的末尾添加字符串？

来自here

BufferedWriter bw = null;

try {
    bw = new BufferedWriter(new FileWriter("checkbook.txt", true));
    bw.write("400:08311998:Inprise Corporation:249.95");
    bw.newLine();
    bw.flush();
} catch (IOException ioe) {
    ioe.printStackTrace();
} finally { // always close the file
    if (bw != null) {
        try {
            bw.close();
        } catch (IOException ioe2) {
            // just ignore it
        }
    }
}

根据Joachim Sauer的建议，您可以使用FileWriter代替

new OutputStreamWriter(new FileOutputStream(..), ecnoding)

如果要指定文件的编码。 FileWriter使用默认编码，该默认编码在安装之间会有所不同。