关于注册登录IO版的代码问题求解 - 黑马程序员技术交流社区

package 子类窗体包;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JOptionPane;
import 父类窗体包.AbstractRegistFrame;
import 用户包.User;
public class RegistFrame extends AbstractRegistFrame {
private static final String userPwd1 = null;
// 关闭按钮
@Override
protected void butClose() {
// 显示登录界面
new LoginFrame().setVisible(true);
// 关闭本界面
this.dispose();
}
// 确定按钮
@Override
protected void butOK() {
// 1.获取窗体数据
String userName = this.txtUserName.getText();
String userPwd1 = new String(this.txtPwd.getPassword());
String userPwd2 = new String(this.txtPwd2.getPassword());
//2.验证用户名和密码是否为空
if(userName.trim().length() == 0){
JOptionPane.showMessageDialog(this, "请输入用户名");
return;
}
if(userPwd1.trim().length() == 0){
JOptionPane.showMessageDialog(this, "请输入用户密码!");
return;
}
if(userPwd2.trim().length() == 0){
JOptionPane.showMessageDialog(this, "请输入确认密码!");
return;
}
//3.验证用户名是否相同
try {
List<User> userList = getAllUser();
for(int i = 0;i < userList.size();i++){
User u = userList.get(i);
if(u.getLoginName().equals(userName)){
JOptionPane.showMessageDialog(this, "用户名" + userName + "已被使用,请指定其他用户名!");
return;
}
}
} catch (IOException e) {
e.printStackTrace();
}
//4.两次输入的密码必须一致
if(!userPwd1.equals(userPwd2)){
JOptionPane.showMessageDialog(this, "两次输入的密码不一致!");
return;
}
//5.封装对象
User user = new User(userName,userPwd1);
//6.将对象封装到集合中
try {
writerUser(user);
} catch (IOException e) {
JOptionPane.showMessageDialog(this, "在写入用户信息时发生异常,请于系统管理员联系!");
return;
}
//7.弹出对话框提示用户注册成功
JOptionPane.showMessageDialog(this, "恭喜您注册成功!");
//显示登陆界面
new LoginFrame().setVisible(true);
//关闭本界面
this.dispose();
}
private void writerUser(User user) throws IOException {
//文件输出流
Writer out = new FileWriter("user",true);
//输出数据
out.write("\r\n" + user.getLoginName()+","+user.getLoginPwd());
//释放资源
out.close();
}
private List<User> getAllUser() throws IOException {
//字符输入流
FileReader in = new FileReader("user");
List<User> userList = new ArrayList<>();
int n = 0;
//存储一行的数据
StringBuffer buf = new StringBuffer();
while((n = in.read()) != -1){
//将读取的数据转换成字符类型存储在字符串缓冲区
char c = (char)n;
if(c=='\r'){
continue;
}
if(c == '\n'){
//判断缓冲区内是否有数据
if(buf.length() != 0){
//取出缓冲区中的数据,转换为字符串
String row = buf.toString();
//将字符串使用逗号切割
String[] strArray = row.split(",");
String userName = strArray[0];
String userPwd = strArray[1];
//封装成User对象
User user = new User(userName,userPwd);
//将User对象添加到集合中
userList.add(user);
//清空StringBuffer
buf.delete(0,buf.length());
}
continue;
}
buf.append(c);
}
if(buf.length() != 0){
//取出缓冲区中的数据,转换为字符串
String row = buf.toString();
//将字符串使用逗号切割
String[] strArray = row.split(",");
String userName = strArray[0];
String userPwd = strArray[1];
//封装成User对象
User user = new User(userName,userPwd);
//将User对象添加到集合中
userList.add(user);
//清空StringBuffer
buf.delete(0,buf.length());
}
//关闭流
in.close();
//将List返回
return userList;
}
}

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