通过字节输入输出流，对标识文件读写，并按规定输出

/**
 * 创建用户类额
 * @author square 凉
 *
 */
public class User {

 private String userName;
 private String password;
 private String Name;
 public String getUserName() {
  return userName;
 }
 public void setUserName(String userName) {
  this.userName = userName;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 
 public String getName() {
  return Name;
 }
 public void setName(String name) {
  Name = name;
 }
 
 public User(String userName, String password, String name) {
  super();
  this.userName = userName;
  this.password = password;
  Name = name;
 }
 //重写tostring方法
 @Override
 public String toString() {
  return "userName:" + userName + ", password:" + password + ", Name:" + Name;
 }
 
}

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import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/**
 * 通过代码读入文档中的内容，实现内容的规定显示
 * @author square 凉
 *
 */
public class Test2Main {

 public static void main(String[] args) throws IOException {
  // TODO Auto-generated method stub
  //1 标识文件
  File file = new File("G:\英雄时刻\user.data");
//  //创建输出流对象
//  FileOutputStream output = new FileOutputStream(file,true);
//  String str = new User("zhaoliu", "zl123", "赵六").toString();//将对象信息写入文档
//  if(file.length() > 0) {
//   str = ";" + str;
//  }
//  byte[] bytes = str.getBytes();
//  output.write(bytes, 0, bytes.length);
//  output.flush();
//  output.close();
  /*
   * 读取标识文件，并按规定输出显示
   */
  readShow(file);

 }

 private static void readShow(File file) throws IOException {
  // TODO Auto-generated method stub
  FileInputStream input = new FileInputStream(file);//创建输入流
  byte[] bytes = new byte[4096];//定义字节数组，存储读入的数据
  int num;
  String str = null;
  while ((num = input.read(bytes, 0, bytes.length)) != -1) {
   str = new String(bytes, 0, num);

  }
  String[] splituser = str.split(";");
  String username = null;
  String password = null;
  String name = null;
  System.out.println("编号" + " " + "用户名" + " " + "密码" + " " + "姓名");
  for (int i = 0; i < splituser.length; i++) {
   String[] splitshux = splituser[i].split(",");
   for (int j = 0; j < splitshux.length; j++) {
    String[] split = splitshux[j].split(":");
    if (j == 0) {
     username = split[1];
    } else if (j == 1) {
     password = split[1];
    } else {
     name = split[1];
    }
   }
   System.out.println(i + 1 + " " + username + password + " " + name);
  }
  input.close();

 }

}