package com.demo.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * 用户登录 Action
 * 展示：
 * - 表单参数接收
 * - 数据验证
 * - Session 使用
 * - 返回不同结果
 */
public class LoginAction extends ActionSupport {
    
    private String username;
    private String password;
    
    @Override
    public String execute() throws Exception {
        // 模拟登录验证
        if ("admin".equals(username) && "123456".equals(password)) {
            // 登录成功，设置 session
            return SUCCESS;
        } else if (username != null && !username.isEmpty()) {
            // 登录失败
            addActionError("用户名或密码错误!");
            return INPUT;
        }
        return INPUT;
    }
    
    // 表单验证
    @Override
    public void validate() {
        if (username == null || username.trim().length() < 3) {
            addFieldError("username", "用户名至少3个字符");
        }
        if (password == null || password.length() < 6) {
            addFieldError("password", "密码至少6个字符");
        }
    }
    
    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; }
}