FormFile ( org.apache.struts.upload.FormFile ) をファイルに書き出す

private void _saveFormFile(String filePath, FormFile upfile) throws Exception 
{
    InputStream is = upfile.getInputStream();
    BufferedInputStream bis = new BufferedInputStream(is);
    FileOutputStream fos = new FileOutputStream(filePath);
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    int read = 0;
    while ((read = bis.read()) != -1) {
        bos.write(read);
    }
    bos.flush();
    bis.close();
    bos.close(); 
}

書き出したファイルをArrayListに格納する

private ArrayList _readFile(String filePath) throws Exception 
{
    File file = new File(filePath);
    FileInputStream fis = new FileInputStream(filePath);
    InputStreamReader isr = new InputStreamReader(fis, "utf-8"));
    BufferedReader br = new BufferedReader(isr);
    ArrayList lines = new ArrayList();
    String line = br.readLine();
    while(line != null){
        lines.add(line);
        line = br.readLine();
    }
    br.close();
    return lines;
}

Listに格納されたテキストをファイルに書き出す

private void _saveFile(String filePath, List lines) throws Exception 
{
    File file = new File(filePath);
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath),"utf-8"));
    for (Iterator i = lines.iterator(); i.hasNext();) {
        bw.write((String)i.next());
        bw.newLine();
        bw.flush();
    }
    bw.close();
    return;
}

参考サイト

http://www.ingrid.org/jajakarta/struts/struts1.0/ja/target/documentation/api/index.html

http://www.javaroad.jp/opensource/js_struts20.htm