前言：给大家讲解EasyUi项目《网上书城》

*权限：不同用户登录时，树形菜单会展示出不同的效果

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开发工具:eclipse，MySQL

 思维导图：

目录

1、目标

2、思路，代码以及效果展示

1、登录、注册

2、权限

2.1、user表中type中1为商家，2为买家

可以根据用户的type值来登录不同的界面

2.2、实现权限登录的思路

2.3、代码

1、目标

1、登录、注册

2、权限树形展示（不同用户登录时，树形菜单会展示出不同的效果）

2、思路，代码以及效果展示

1、登录、注册

登录、注册个人觉得比较简单。思路如下：

1、在实体类entity创建user类

2、在dao层中写好相应的方法（登录login、注册register方法）

3、然后在子控制器中写好对应的方法。

4、最后到配置文件中xml写好相应路径

user实体类

public class User {	private long id;	private String name;	private String pwd;	private int type;	public long getId() {		return id;	}	public void setId(long id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public String getPwd() {		return pwd;	}	public void setPwd(String pwd) {		this.pwd = pwd;	}	public int getType() {		return type;	}	public void setType(int type) {		this.type = type;	}	@Override	public String toString() {		return "User [id=" + id + ", name=" + name + ", pwd=" + pwd + ", type=" + type + "]";	}			}

dao层

    public User login(User user) throws Exception {		String sql = "select * from t_easyui_user where name = ""+user.getName()+"" and pwd = ""+user.getPwd()+""";		return super.executeQuery(sql, User.class, null).get(0);	}		public void add(User user) throws Exception {		String sql = "insert into t_easyui_user(name,pwd) values(?,?)";		super.executeUpdate(sql, user, new String[] {"name","pwd"});			}

子控制器层

public class UserAction extends ActionSupport implements ModelDriver {	private User user = new User();	private UserDao userDao = new UserDao();	public User getModel() {		return user;	}	public String login(HttpServletRequest req, HttpServletResponse resp) {		try {			User u = userDao.login(user);			if(u == null) {				return "toLogin";			}			req.getSession().setAttribute("cuser", u);		} catch (Exception e) {			e.printStackTrace();			return "toLogin";		}		//只要数据库中有这个用户就跳转到主界面		return "main";	}	public String register(HttpServletRequest req, HttpServletResponse resp) {		try {			userDao.add(user);			req.setAttribute("mag", "用户名密码错误");		} catch (Exception e) {			e.printStackTrace();			return "toRegister";		}		//如果注册成功，跳转到登录界面		return "toLogin";	}}

配置文件hpw.xml写好相应路径

2、权限

2.1、user表中type中1为商家，2为买家

可以根据用户的type值来登录不同的界面

2.2、实现权限登录的思路

1、将两个表关联起来，其中Permission中的id与pid行成主外键关系，RolePermission中的rid与      pid行成父子关系。

2、从两个表中得到type对应的菜单号将其显示

2.3、代码

PermissionDao:

public List list(Permission permission, PageBean pageBean) throws Exception {		String sql = "select * from t_easyui_Permission where 1=1";		return super.executeQuery(sql, Permission.class, pageBean);	}		public List listPlus(String ids) throws Exception {		//ids="1,2,3,4,5,6,7,8,9,14";		String sql = "select * from t_easyui_Permission where id in ("+ids+")";		return super.executeQuery(sql, Permission.class, null);	}	public List> tree(Permission permission, PageBean pageBean) throws Exception {		List list = this.list(permission, pageBean);		List> listVo = new ArrayList>();		for (Permission p : list) {			TreeVo vo = new TreeVo<>();			vo.setId(p.getId() + "");			vo.setText(p.getName());			vo.setParentId(p.getPid() + "");			Map map = new HashMap();			map.put("self", p);			vo.setAttributes(map);			listVo.add(vo);		}		return BuildTree.buildList(listVo, "0");	}		public List> treePuls(String ids) throws Exception {		List list = this.listPlus(ids);		List> listVo = new ArrayList>();		for (Permission p : list) {			TreeVo vo = new TreeVo<>();			vo.setId(p.getId() + "");			vo.setText(p.getName());			vo.setParentId(p.getPid() + "");			Map map = new HashMap();			map.put("self", p);			vo.setAttributes(map);			listVo.add(vo);		}		return BuildTree.buildList(listVo, "0");	}

PermissionAction:

public class PermissionAction extends ActionSupport implements ModelDriver {	Permission permission = new Permission();	PermissionDao permissionDao = new PermissionDao();	UserDao userDao = new UserDao();	RolePermissionDao rolePermissionDao = new RolePermissionDao();		public Permission getModel() {		return permission;	}		public String tree(HttpServletRequest req, HttpServletResponse resp) {		try {			User cuser = (User) req.getSession().getAttribute("cuser");			if(cuser == null) {				return "toLogin";			}			int type = cuser.getType();			List findRolePermissions = rolePermissionDao.findRolePermission(type);			StringBuffer sb = new StringBuffer();			for (RolePermission rp : findRolePermissions) {				sb.append(",").append(rp.getPid());			}			//ids="1,2,3,4,5,6,7,8,9,14";			//List listPlus = permissionDao.listPlus(sb.substring(1));			List> treePuls = permissionDao.treePuls(sb.substring(1));			//List> tree = permissionDao.tree(null, null);			ResponseUtil.writeJson(resp, treePuls);		} catch (Exception e) {			e.printStackTrace();			try {				ResponseUtil.writeJson(resp, "0");			}  catch (IOException e1) {				e1.printStackTrace();			}		}		return null;	}	}

 RolePermissionDao：

package com.zking.dao;import java.util.List;import com.hpw.entity.RolePermission;import com.hpw.util.BaseDao;public class RolePermissionDao extends BaseDao {	/**	 * 通过user表中的type字段进行查询，查询出商家/买家对应的菜单ID	 * @param type	 * @return	 * @throws Exception	 */	public List findRolePermission(int type) throws Exception {		String sql = "select * from t_easyui_role_Permission where rid = "+type;		return super.executeQuery(sql, RolePermission.class, null);	}	}

效果展示:

买家身份登陆

商家身份登陆

到这里就结束了，其中重点是权限登录，当中的逻辑比较复杂

欢迎大佬指点