java 读取文件

package utils;

import java.io.*;

/**
 * 想本地文件中写入数据
 */
public class WriteFileToLocal {
    /**
     * 向本地文件中追加写入数据
     * @param fileNamePath  写入的本地路径
     * @param content  写入的文件内容
     */
    public static void method3(String fileNamePath, String content) {
        java.io.RandomAccessFile randomFile = null;
        try {
            // 打开一个随机访问文件流，按读写方式
            randomFile = new RandomAccessFile(fileNamePath, "rw");
            // 文件长度，字节数
            long fileLength = randomFile.length();
            // 将写文件指针移到文件尾。
            randomFile.seek(fileLength);
            //获取系统换行符“property”相当于换行符“\,”
            String property = System.getProperty("line.separator");
//            randomFile.writeBytes(content+"\t\n");
            randomFile.writeBytes(content+property);
        } catch (IOException e) {
            e.printStackTrace();
        } finally{
            if(randomFile != null){
                try {
                    randomFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 读取文本文件.
     *
     */
    public static String readTxtFile(String path){
        BufferedReader bufread;
        String read;
        FileReader fileread;
        String readStr ="";
        File filename = new File(path);
        try {
            fileread = new FileReader(filename);
            bufread = new BufferedReader(fileread);
            try {
                while ((read = bufread.readLine()) != null) {
                    readStr = readStr + read+ "\r\n";
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

//        System.out.println("文件内容是:"+ "\r\n" + readStr);
        return readStr;
    }
    public static void main(String[] args) {
        method3("G:\\test.txt","777");
        String s = readTxtFile("G:\\test.txt");
        System.out.println(s);
//        String property = System.getProperty("line.separator");
//        System.out.println("ss"+property+"oo");
    }
}