Java 文件操作

//写入当当前路径下
        FileWriter fileWriter = new FileWriter(".\\robots.txt");
        BufferedWriter writer = new BufferedWriter(fileWriter);
        writer.write("Hello World");
        writer.close();

//读取当前路径下的文件"robots.txt"
FileReader fileReader = new FileReader(".\\robots.txt");
        BufferedReader reader = new BufferedReader(fileReader);
        String str;
        while ((str = reader.readLine()) != null){
            System.out.println(str);
        }

File file = new File(".\\src\\main\\java\\io\\readme.txt");
        if (file.delete()){
            System.out.println("删除成功!");
        }else{
            System.out.println("删除失败!");
        }

FileReader fileReader = new FileReader(".\\robots.txt");
        BufferedReader reader = new BufferedReader(fileReader);
        FileWriter fileWriter = new FileWriter(".\\result.txt");
        BufferedWriter writer = new BufferedWriter(fileWriter);
        String str="";
        while ((str = reader.readLine()) != null){
            writer.write(str+"\n");
        }
        //关闭资源
        reader.close();
        writer.close();

File file = new File(".\\robots.txt");
        if (file.exists()){
            System.out.println("文件大小为 "+file.length()+"KB");
        }

// 旧的文件或目录
        File oldName = new File("./runoob-test.txt");
        // 新的文件或目录
        File newName = new File("./runoob-test-2.txt");
        if (newName.exists()) {  //  确保新的文件名不存在
            throw new java.io.IOException("file exists");
        }
        if(oldName.renameTo(newName)) {
            System.out.println("已重命名");
        } else {
            System.out.println("Error");
        }

File file = new File(".\\info.txt");
        file.setReadOnly();//设置只读
        System.out.println("当前文件可写性: "+file.canWrite());//false

File file = new File(".\\info.txt");
        file.setWritable(true); //设置可写
        System.out.println("当前文件可写性: "+file.canWrite());//true

//当前目录下创建一个文件"a.csv"
File file = new File(".\\a.csv");
        file.createNewFile();

File file = new File("D:\\hello.png");
        File file1 = new File("D:\\a.jpg");
        if (file1.compareTo(file) == 0){
            System.out.println("两个文件路径一致");
        }else {
            System.out.println("两个文件路径不一致");
        }