java file

Test Package; 

Import the java.io. *; 

public class FileUtils { 


    / ** 
     * @param Message saved message 
     * @param contentFile saved file 
     * saved message store, a file data storage message, save the message in a lookup index 
     @throws IOException * 
     * / 
    public static void saveDataLog (String Message, File contentFile) throws IOException { 
        String indexFilePath = "Message-00000.index"; 
        File = INDEXFILE new new File (indexFilePath); 

        BufferedWriter, IndexWriter BufferedWriter, new new = (new new FileWriter (INDEXFILE , to true)); 
        BufferedWriter, contentWriter BufferedWriter, new new = (new new FileWriter (contentFile, to true)); 
 
        Integer indexTotalLines = getTotalLines (INDEXFILE);
        Integer contentTotalLines = getTotalLines (contentFile);
        String indexString = indexTotalLines +","+contentTotalLines+","+indexFilePath+"\n";

        indexWriter.write(indexString);
        contentWriter.write(message+"\n");

        indexWriter.close();
        contentWriter.close();
    }


    /**
     * @param number
     * @param file
     * 根据行数获取第几行的数据
     * @return
     * @throws IOException
     */
    public static String getNumLine(Integer number,File file) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(file));
        Integer count = 0;

        String line = null;
        while ((line = reader.readLine()) != null){
            if(number == count){
                break;
            }
            count += 1;
        }
        reader.close();
        return line;
    }

    /**
     * @param file
     * 获取文件的总行数
     * @return 文件总的行数
     * @throws IOException
     */
    public static Integer getTotalLines(File file) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(file));
        Integer count = 0;
        while (reader.readLine() != null){
            count += 1;
        }
        reader.close();
        return count;
    }

    /**
     * 
     * @param indexString
     * @return
     * @throws IOException
     */

    public static String[] getLineByIndex(String indexString) throws IOException {
        String[] splitArray = indexString.split(",");
        return splitArray;
    }

    public static void main(String[] args) throws IOException {

//        System.out.println(getTotalLines(new File("message.txt")));
//        System.out.println(getNumLine(2,new File("message.txt")));
//        saveDataLog("this is a sting.",new File("message.message"));

        String[] index = getLineByIndex("2,3");
        Integer lineByIndex = Integer.parseInt(index[1]);
        String numLine = getNumLine(lineByIndex, new File("message.message"));
        System.out.println(numLine);
    }

}