java读写文件

public static void main(String[] args){    try {    String log ="null";    String lat ="null";    //读取文件    BufferedReader brlog =new BufferedReader(new InputStreamReader(new FileInputStream("d:\\log.txt")));          //读取文件    BufferedReader brlat =new BufferedReader(new InputStreamReader(new FileInputStream("d:\\lat.txt")));          //写文件    PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream("E:\\ictmaplog20101025out.txt")),true);              //判断是否为最后一行    while((log=brlog.readLine())!=null && (lat=brlat.readLine())!=null){    String destStr="";    if(log.endsWith("null") || lat.endsWith("null")){    //System.out.println("null;null;null");    destStr = "null;null;null";    pw.println(destStr);    continue;    }            //判断不为NULL                                          //System.out.println(destStr);            pw.println(destStr);            }    pw.close();    brlat.close();    brlog.close();        System.out.println("导出成功");} catch (Exception e) {e.printStackTrace();System.out.println("导出失败");}}