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用户操作与数据管理：登录验证与信息查询

最新推荐文章于 2025-12-06 22:07:37 发布

原创最新推荐文章于 2025-12-06 22:07:37 发布 · 153 阅读

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CC 4.0 BY-SA版权

文章标签：

#layui #前端 #javascript

本文介绍了UserAction类中处理用户登录、数据查询及增删改的操作，展示了如何使用Spring MVC和DAO进行前后端交互，以及返回JSON响应。

1.主界面

2.代码展示

package com.zking.web;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.zking.dao.UserDao;
import com.zking.entity.User;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.PageBean;
import com.zking.util.R;
import com.zking.util.ResponseUtil;

public class UserAction extends ActionSupport implements ModelDriver<User>{

	private User user = new User();
	private UserDao userdao = new UserDao();
//	写一个方法处理前台的请求
	public String login(HttpServletRequest req, HttpServletResponse resp) {
		try {
			User u = userdao.login(user);
//			通过用户名密码查到了用户记录
		if(u != null) {
//			ResponseUtil.writeJson(resp, new R()
//					.data("code", 200)
//					.data("msg", "成功"));
			ResponseUtil.writeJson(resp, R.ok(200, "登录成功"));
			req.getSession().setAttribute("user", u);
		}
		else {
			ResponseUtil.writeJson(resp, R.error(0, "用户名密码错误"));
		}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
//	用户查询
	public String list(HttpServletRequest req, HttpServletResponse resp) {
		try {
			PageBean pageBean = new PageBean();
			pageBean.setRequest(req);
			List<Map<String, Object>> users = userdao.list(user, pageBean);
//		注意：layui中的数据表的格式
			ResponseUtil.writeJson(resp, R.ok(0, "用户数据查询成功",pageBean.getTotal(),users));
		} catch (Exception e) {
			e.printStackTrace();
			try {
				ResponseUtil.writeJson(resp, R.ok(0, "用户数据查询失败"));
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
		return null;
	}
// 查询所有用户用于绑定的多功能下拉框
	public String queryUserAll(HttpServletRequest req, HttpServletResponse resp) {
		try {
			List<Map<String, Object>> users = userdao.queryUserAll(user,null);
			ResponseUtil.writeJson(resp, R.ok(200, "获取用户多选框数据成功！！！", users));
		} catch (Exception e) {
			e.printStackTrace();
			try {
				ResponseUtil.writeJson(resp, R.error(0, "获取用户多选框数据失败"));
			} catch (Exception e1) {
				e1.printStackTrace();
			}
		}
		return null;
	}
	public String add(HttpServletRequest req, HttpServletResponse resp) {
		try {
//			rs是sql语句执行的影响行数
			int rs = userdao.add(user);
			if(rs>0) {
				ResponseUtil.writeJson(resp, R.ok(200, "用户数据新增成功"));
			}
		} catch (Exception e) {
			e.printStackTrace();
			try {
				ResponseUtil.writeJson(resp, R.ok(0, "用户数据新增失败"));
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
		return null;
	}
	public String del(HttpServletRequest req, HttpServletResponse resp) {
		try {
//			rs是sql语句执行的影响行数
			int rs = userdao.del(user);
			if(rs>0) {
				ResponseUtil.writeJson(resp, R.ok(200, "用户数据删除成功"));
			}
		} catch (Exception e) {
			e.printStackTrace();
			try {
				ResponseUtil.writeJson(resp, R.ok(0, "用户数据删除失败"));
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
		return null;
	}
	public String edit(HttpServletRequest req, HttpServletResponse resp) {
		try {
//			rs是sql语句执行的影响行数
			int rs = userdao.edit(user);
			if(rs>0) {
				ResponseUtil.writeJson(resp, R.ok(200, "用户数据修改成功"));
			}
		} catch (Exception e) {
			e.printStackTrace();
			try {
				ResponseUtil.writeJson(resp, R.ok(0, "用户数据修改失败"));
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
		return null;
	}
	
	@Override
	public User getModel() {
		// TODO Auto-generated method stub
		return user;
	}
	
}