springboot实现简单的登录注册
1.项目主要结构
2.application.yml文件内容
server:
port:8080
spring:
profiles:
active: prod //spring默认配置
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/order
username: root
password: 123
resources:
static-locations: classpath:/templates #访问静态页面
3.login.html和register.html页面
用户登录
跳转
(2)regist.html
用户注册
3.Result和User实体类
（1）
public class Result{ //返回信息 private String msg; //数据是否正常请求 private boolean success; //具体返回的数据 private T detail; //... getter and setter public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public boolean isSuccess() { return success; } public void setSuccess(boolean success) { this.success = success; } public T getDetail() { return detail; } public void setDetail(T detail) { this.detail = detail; } }
（2）
public class User {
private Long id;
private String username;
private String password;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
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;
}
}
4.LoginHandlerInterceptor
@Controller
@Component
public class LoginHandlerInterceptor implements HandlerInterceptor {
//目标方法执行之前
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
Object user = request.getSession().getAttribute("loginUser");
if (user == null) {
//未登陆，返回登陆页面
request.setAttribute("msg", "没有权限请先登陆");
request.getRequestDispatcher("/login.html").forward(request, response);
return false;
} else {
//已登陆，放行请求
return true;
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
5.MyMvcConfig
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {
@Autowired
LoginHandlerInterceptor loginHandlerInterceptor;
@Override
public void addViewControllers(ViewControllerRegistry registry) {
// super.addViewControllers(registry);视图映射
//浏览器发送 /atguigu 请求来到 success
registry.addViewController("/atguigu").setViewName("success");
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
//添加对用户是否登录的拦截器，并添加过滤项、排除项
registry.addInterceptor(loginHandlerInterceptor).addPathPatterns("/**")
.excludePathPatterns("/css/**","/js/**","/images/**")//排除样式、脚本、图片等资源文件
.excludePathPatterns("/login.html")//排除登录页面
.excludePathPatterns("/user/login");//排除验证码
// .excludePathPatterns("/wechatplatformuser/loginRBAC");//排除用户点击登录按钮
}
6.UserController
@Controller //相当于@Controller+@RequestBody
//@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
/**
* 注册
* @param user 参数封装
* @return Result
*/
@PostMapping("/user/regist")
public String regist(User user, HttpServletRequest request, HttpServletResponse response){
Result result =new Result();
result = userService.regist(user);
System.out.println(result.getMsg());
// request.getRequestDispatcher("/emp/list.heml").forward(request,response);
return "login";
}
@RequestMapping("/user/test")
public String test(){
return "index";
}
@RequestMapping(value = {"/","/index.html"})
public String toLogin(){
return "login";
}
/**
* 登录
* @param user 参数封装
* @return Result
*/
@PostMapping(value = "/user/login")
public String login(User user, HttpSession session){
Result result = new Result();
System.out.println(user.getUsername());
session.setAttribute("loginUser",user.getUsername());
result=userService.login(user);
return "/emp/success";
}
7.UserMapper
@Repository
@Mapper
public interface UserMapper {
/**
* 查询用户名是否存在，若存在，不允许注册
* 注解@Param(value) 若value与可变参数相同，注解可省略
* 注解@Results 列名和字段名相同，注解可省略
* @param username
* @return
*/
@Select(value = "select u.username,u.password from user u where u.username=#{username}")
@Results
({@Result(property = "username",column = "username"),
@Result(property = "password",column = "password")})
User findUserByName(@Param("username") String username);
/**
* 注册 插入一条user记录
* @param user
* @return
*/
@Insert("insert into user values(#{id},#{username},#{password})")
//加入该注解可以保存对象后，查看对象插入id
@Options(useGeneratedKeys = true,keyProperty = "id",keyColumn = "id")
void regist(User user);
/**
* 登录
* @param user
* @return
*/
@Select("select u.id from user u where u.username = #{username} and password = #{password}")
Long login(User user);
}
8.UserService
@Service
@Transactional(rollbackFor = RuntimeException.class)
public class UserService {
@Autowired
private UserMapper userMapper;
/**
* 注册
* @param user 参数封装
* @return Result
*/
public Result regist(User user) {
Result result = new Result();
result.setSuccess(false);
result.setDetail(null);
try {
User existUser = userMapper.findUserByName(user.getUsername());
if(existUser != null){
//如果用户名已存在
result.setMsg("用户名已存在");
}else{
userMapper.regist(user);
//System.out.println(user.getId());
result.setMsg("注册成功");
result.setSuccess(true);
result.setDetail(user);
}
} catch (Exception e) {
result.setMsg(e.getMessage());
e.printStackTrace();
}
return result;
}
/**
* 登录
* @param user 用户名和密码
* @return Result
*/
public Result login(User user) {
Result result = new Result();
result.setSuccess(false);
result.setDetail(null);
try {
Long userId= userMapper.login(user);
if(userId == null){
result.setMsg("用户名或密码错误");
}else{
result.setMsg("登录成功");
result.setSuccess(true);
user.setId(userId);
result.setDetail(user);
}
} catch (Exception e) {
result.setMsg(e.getMessage());
e.printStackTrace();
}
return result;
}
}