java实现角色及菜单权限的项目实践

// 用户实体类
public class User {
    private Long id;
    private String username;
    private String password;
    private List<Role> roles; // 用户拥有的角色列表

    // Getters and Setters
}

// 角色实体类
public class Role {
    private Long id;
    private String name;
    private List<Permission> permissions; // 角色拥有的权限列表

    // Getters and Setters
}

// 权限实体类
public class Permission {
    private Long id;
    private String name;
    private String url; // 权限对应的URL

    // Getters and Setters
}

// 菜单实体类
public class Menu {
    private Long id;
    private String name;
    private String url;
    private List<Permission> permissions; // 菜单拥有的权限列表

    // Getters and Setters
}

CREATE TABLE `user` (
    `id` BIGINT AUTO_INCREMENT PRIMARY KEY,
    `username` VARCHAR(255) NOT NULL,
    `password` VARCHAR(255) NOT NULL
);

CREATE TABLE `role` (
    `id` BIGINT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL
);

CREATE TABLE `permission` (
    `id` BIGINT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL,
    `url` VARCHAR(255) NOT NULL
);

CREATE TABLE `menu` (
    `id` BIGINT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL,
    `url` VARCHAR(255) NOT NULL
);

CREATE TABLE `user_role` (
    `user_id` BIGINT,
    `role_id` BIGINT,
    PRIMARY KEY (`user_id`, `role_id`),
    FOREIGN KEY (`user_id`) REFERENCES `user`(`id`),
    FOREIGN KEY (`role_id`) REFERENCES `role`(`id`)
);

CREATE TABLE `role_permission` (
    `role_id` BIGINT,
    `permission_id` BIGINT,
    PRIMARY KEY (`role_id`, `permission_id`),
    FOREIGN KEY (`role_id`) REFERENCES `role`(`id`),
    FOREIGN KEY (`permission_id`) REFERENCES `permission`(`id`)
);

CREATE TABLE `menu_permission` (
    `menu_id` BIGINT,
    `permission_id` BIGINT,
    PRIMARY KEY (`menu_id`, `permission_id`),
    FOREIGN KEY (`menu_id`) REFERENCES `menu`(`id`),
    FOREIGN KEY (`permission_id`) REFERENCES `permission`(`id`)
);

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    public List<User> getAllUsers() {
        return userRepository.findAll();
    }

    public User getUserById(Long id) {
        return userRepository.findById(id).orElse(null);
    }

    // 其他方法...
}

@Service
public class RoleService {
    @Autowired
    private RoleRepository roleRepository;

    public List<Role> getAllRoles() {
        return roleRepository.findAll();
    }

    public Role getRoleById(Long id) {
        return roleRepository.findById(id).orElse(null);
    }

    // 其他方法...
}

@Service
public class PermissionService {
    @Autowired
    private PermissionRepository permissionRepository;

    public List<Permission> getAllPermissions() {
        return permissionRepository.findAll();
    }

    public Permission getPermissionById(Long id) {
        return permissionRepository.findById(id).orElse(null);
    }

    // 其他方法...
}

@Service
public class MenuService {
    @Autowired
    private MenuRepository menuRepository;

    public List<Menu> getAllMenus() {
        return menuRepository.findAll();
    }

    public Menu getMenuById(Long id) {
        return menuRepository.findById(id).orElse(null);
    }

    // 其他方法...
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/api")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/users")
    public List<User> getAllUsers() {
        return userService.getAllUsers();
    }

    @GetMapping("/users/{id}")
    public User getUserById(@PathVariable Long id) {
        return userService.getUserById(id);
    }

    // 其他方法...
}

@RestController
@RequestMapping("/api")
public class RoleController {
    @Autowired
    private RoleService roleService;

    @GetMapping("/roles")
    public List<Role> getAllRoles() {
        return roleService.getAllRoles();
    }

    @GetMapping("/roles/{id}")
    public Role getRoleById(@PathVariable Long id) {
        return roleService.getRoleById(id);
    }

    // 其他方法...
}

@RestController
@RequestMapping("/api")
public class PermissionController {
    @Autowired
    private PermissionService permissionService;

    @GetMapping("/permissions")
    public List<Permission> getAllPermissions() {
        return permissionService.getAllPermissions();
    }

    @GetMapping("/permissions/{id}")
    public Permission getPermissionById(@PathVariable Long id) {
        return permissionService.getPermissionById(id);
    }

    // 其他方法...
}

@RestController
@RequestMapping("/api")
public class MenuController {
    @Autowired
    private MenuService menuService;

    @GetMapping("/menus")
    public List<Menu> getAllMenus() {
        return menuService.getAllMenus();
    }

    @GetMapping("/menus/{id}")
    public Menu getMenuById(@PathVariable Long id) {
        return menuService.getMenuById(id);
    }

    // 其他方法...
}