userio.java

我做的第一个java MIS项目

package server.io;

import java.io.*;
import java.util.Vector;

public class Userio {
    //载入曾登陆帐户名
    public Vector loaduserlandname() {
        Vector landusername = new Vector();
        //读取曾登陆帐户名记录文件
        try {
            FileReader fruserlandname = new FileReader(
                    ".//cookie//userlandname.dat");
            BufferedReader br = new BufferedReader(fruserlandname);
            String line = br.readLine();
            //先给数组赋一个空值（目的为让登陆框初始化为空）
            landusername.addElement("");
            //循环赋值到数组中
            while (line != null) {
                landusername.addElement(line);
                line = br.readLine();
            }
            landusername.addElement("-清空曾登陆帐户-");
            fruserlandname.close();
        } catch (IOException ex) {
            System.out.println("用户曾登陆记录文件读取出错！");
        }
        //返回该数组
        return landusername;
    }

    //清空曾登陆帐户名
    public void cleanuserlandname() {
        try {
            FileWriter fw = new FileWriter(".//cookie//userlandname.dat");
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write("");
            bw.flush();
            bw.close();
        } catch (IOException ex) {
            System.out.println("用户曾登陆记录文件清空出错！");
        }
    }

    //添加曾登陆帐户名
    public void adduserlandname(String newuserlandname) {
        //检查是否重复
        boolean isnamehas = false;
        Vector usernamearr = new Vector();
        //得到记录文件中所有重登陆名到数组
        try {
            FileReader fr = new FileReader(".//cookie//userlandname.dat");
            BufferedReader br = new BufferedReader(fr);
            String line = br.readLine();
            while (line != null) {
                //非空帐户记录到数组
                if (!line.equals("")) {
                    usernamearr.addElement(line);
                }
                line = br.readLine();
            }
            br.close();
            fr.close();
        } catch (IOException ex1) {
            System.out.println("用户曾登陆记录检查出错！");
        }
        //判断数组中是否包含键入的帐户
        isnamehas = usernamearr.contains(newuserlandname);
        //添加登陆记录
        if (!isnamehas) {
            //加入帐户记录到数组
            usernamearr.addElement(newuserlandname);
            //数组写入记录文件
            try {
                FileWriter fw = new FileWriter(".//cookie//userlandname.dat");
                BufferedWriter bw = new BufferedWriter(fw);
                for (int i = 0; i < usernamearr.size(); i++) {
                    bw.write(usernamearr.elementAt(i).toString());
                    bw.write("\n");
                }
                bw.close();
                fw.close();
            } catch (IOException ex) {
                System.out.println("用户曾登陆记录写入出错！");
            }
        } else {
            System.out.println("记录重复，放弃写入。");
        }
    }

    //得到超级用户密码
    public static String getsuperuserpwd() {
        String getsuperpwd = "";
        try {
            FileReader frsuperuserpwd = new FileReader(".//suser//suser.dat");
            BufferedReader br = new BufferedReader(frsuperuserpwd);
            getsuperpwd = br.readLine();
            br.close();
            frsuperuserpwd.close();
        } catch (IOException ex) {
            System.out.println("超级用户密码读取出错！");
        }
        return getsuperpwd;
    }

    //设置超级用户密码
    public static void setsuperuserpwd(String setsuserpwd)
    {
        try
        {
            FileWriter fwsuperuserpwd=new FileWriter(".//suser//suser.dat");
            BufferedWriter bw=new BufferedWriter(fwsuperuserpwd);
            bw.write(setsuserpwd);
            bw.close();
            fwsuperuserpwd.close();
        }
        catch(IOException e){System.out.println("超级用户密码设置出错！");}
    }

}