取出文件中字符串内容

 public static void main(String[] args) {
        new SubStringInFile().readAndWrite();
    }
    /*
     * 读取文件，将字符串("abc"中abc)取出至文件
     * 同行中去重
     * */
    public void readAndWrite(){
        FileReader fr = null;
        FileWriter fw = null;
        BufferedReader br = null;
        BufferedWriter bw = null;
        try {
            File inFile = new File("original.txt");
            fr = new FileReader(inFile);
            br = new BufferedReader(fr);

            File outFile = new File("subFile.txt");
            fw = new FileWriter(outFile);
            bw = new BufferedWriter(fw);

            String str = "";
            while((str=br.readLine()) != null){
                List<Integer> index = new ArrayList<Integer>();
                //搜索 " add("的位置)
                for(int i=0;i<str.length();i++){
                    String ch = str.charAt(i)+"";
                    if("\"".equals(ch)){
                        index.add(i);
                    }
                }
                StringBuffer sb = new StringBuffer();
                //截取""中的内容,同行中去重
                for (int i = 0; i < index.size(); i += 2) {
                    int begin = index.get(i);
                    int end = index.get(i+1);
                    String temp = str.substring(begin+1, end);
                    String[] sbs = sb.toString().split(" ");
                    for (String s : sbs) {
                        if(s.equals(temp)){
                            temp = "";
                        }
                    }
                    sb.append(temp+" ");
                }
                bw.write(sb.toString());
                bw.newLine();
                bw.flush();
            }
            bw.close();
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }