zoukankan      html  css  js  c++  java
  • java读取文件

    public static void readFileByBytes(String fileName) {
            File file = new File(fileName);
            InputStream in = null;
            StringBuffer sb=new StringBuffer();
            try {
    
                if(file.isFile() && file.exists()){ //判断文件是否存在
                    System.out.println("以字节为单位读取文件内容,一次读多个字节:");
                    // 一次读多个字节
                    byte[] tempbytes = new byte[1024];
                    int byteread = 0;
                    in = new FileInputStream(file);
                    ReadFromFile.showAvailableBytes(in);
                    // 读入多个字节到字节数组中,byteread为一次读入的字节数
                    while ((byteread = in.read(tempbytes)) != -1) {
                      //  System.out.write(tempbytes, 0, byteread);
                        String str=new String(tempbytes,0,byteread);
                        sb.append(str);
                    }
                }else{
                    System.out.println("找不到指定的文件,请确认文件路径是否正确");
                }
    
    
                String data = sb.toString() ;
    
              } catch (Exception e) {
                System.out.println("读取文件内容出错");
                e.printStackTrace();
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e1) {
                    }
                }
            }
    }
       

    /**
    * 显示输入流中的字节数
    */
    private static void showAvailableBytes(InputStream in) {
    try {
    System.out.println("当前字节输入流中的字节数为:" + in.available());
    } catch (IOException e) {
    e.printStackTrace();
    }
    }

    public static void main(String[] args) {

    // String fileName = "D:/file/test3.json";
    String fileName = "D:/file/1.json";
    readFileByBytes(fileName);


    }
    
    
  • 相关阅读:
    [JSOI2007][BZOJ1031] 字符加密Cipher|后缀数组
    leetcode Flatten Binary Tree to Linked List
    leetcode Pascal's Triangle
    leetcode Triangle
    leetcode Valid Palindrome
    leetcode Word Ladder
    leetcode Longest Consecutive Sequence
    leetcode Sum Root to Leaf Numbers
    leetcode Clone Graph
    leetcode Evaluate Reverse Polish Notation
  • 原文地址:https://www.cnblogs.com/JonaLin/p/11016456.html
Copyright © 2011-2022 走看看