public void exportUser(@ApiIgnore @RequestBody Map<String, Object> user, BladeUser bladeUser, HttpServletResponse response) { String userClassId = (String) user.get("userClassId"); User temp = BeanUtil.toBean(user, User.class); if (Func.isNotBlank(userClassId)) temp.setUserClassId(Func.toInt(userClassId)); List<UserExcel> list = userService.exportUser(temp); ExcelUtil.export(response, "座席数据" + DateUtil.time(), "座席数据表", list, UserExcel.class);
时间: 2024-04-18 12:28:32 浏览: 19
这段代码是一个导出用户数据的方法。方法的参数包括一个RequestBody注解修饰的Map对象user,一个BladeUser对象bladeUser,以及一个HttpServletResponse对象response。
首先,从user对象中获取名为"userClassId"的属性,并将其强制转换为String类型,赋值给userClassId变量。
接下来,使用BeanUtil工具类的toBean()方法将user对象转换为User类型的实例对象temp。
然后,通过Func.isNotBlank()方法判断userClassId是否不为空,如果不为空,则将userClassId转换为整数类型,并赋值给temp对象的userClassId属性。
接着,调用userService的exportUser()方法,传入temp对象作为参数,返回一个名为list的UserExcel对象列表。
最后,调用ExcelUtil的export()方法,将list列表导出为Excel文件。export()方法的参数依次为response对象、Excel文件的名称、Excel文件的sheet名称、要导出的数据列表list,以及UserExcel类作为数据列表中元素的类型。
相关问题
用MVC思想实现用户注册功能和登陆功能(利用反射机制自动封装)写出注册页面,登陆页面,登陆成功页面并用模拟数据库实现注册功能和登陆功能
先给出MVC的定义:MVC即Model-View-Controller,是一种软件设计模式,它将一个应用程序分成三个核心部件:数据模型(Model)、视图(View)和控制器(Controller),以增强应用程序的松耦合性、可扩展性和可维护性。
下面是利用MVC思想实现用户注册功能和登陆功能的示例代码:
1. Model层
```java
public class User {
private String username;
private String password;
public User(String username, String password) {
this.username = username;
this.password = password;
}
// getters and setters
}
```
2. View层
注册页面:
```html
<!DOCTYPE html>
<html>
<head>
<title>注册页面</title>
</head>
<body>
<h1>注册页面</h1>
<form action="register" method="post">
<p>用户名:<input type="text" name="username"></p>
<p>密码:<input type="password" name="password"></p>
<p><input type="submit" value="注册"></p>
</form>
</body>
</html>
```
登陆页面:
```html
<!DOCTYPE html>
<html>
<head>
<title>登陆页面</title>
</head>
<body>
<h1>登陆页面</h1>
<form action="login" method="post">
<p>用户名:<input type="text" name="username"></p>
<p>密码:<input type="password" name="password"></p>
<p><input type="submit" value="登陆"></p>
</form>
</body>
</html>
```
登陆成功页面:
```html
<!DOCTYPE html>
<html>
<head>
<title>登陆成功页面</title>
</head>
<body>
<h1>登陆成功,欢迎回来!</h1>
<p>用户名:${username}</p>
<p>密码:${password}</p>
</body>
</html>
```
3. Controller层
```java
public class UserController {
public static void register(HttpServletRequest request, HttpServletResponse response) throws IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
User user = new User(username, password);
// 模拟数据库存储用户信息
// ...
response.sendRedirect("login.jsp"); // 注册成功后跳转到登陆页面
}
public static void login(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
String username = request.getParameter("username");
String password = request.getParameter("password");
// 模拟数据库查询用户信息
// ...
User user = new User(username, password);
HttpSession session = request.getSession();
session.setAttribute("user", user);
request.getRequestDispatcher("success.jsp").forward(request, response); // 登陆成功后跳转到登陆成功页面
}
}
```
4. 反射机制自动封装
```java
public class ReflectUtil {
public static Object autoInject(Object obj, HttpServletRequest request) {
Field[] fields = obj.getClass().getDeclaredFields();
for (Field field : fields) {
String name = field.getName();
String value = request.getParameter(name);
if (value != null) {
field.setAccessible(true);
try {
field.set(obj, value);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
return obj;
}
}
```
5. 注册Servlet
```java
public class RegisterServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
User user = (User) ReflectUtil.autoInject(new User(), request);
// 模拟数据库存储用户信息
// ...
response.sendRedirect("login.jsp"); // 注册成功后跳转到登陆页面
}
}
```
6. 登陆Servlet
```java
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
User user = (User) ReflectUtil.autoInject(new User(), request);
// 模拟数据库查询用户信息
// ...
HttpSession session = request.getSession();
session.setAttribute("user", user);
request.getRequestDispatcher("success.jsp").forward(request, response); // 登陆成功后跳转到登陆成功页面
}
}
```
以上就是利用MVC思想实现用户注册功能和登陆功能的完整示例代码,其中模拟数据库的部分可以使用Java的Map等数据结构来实现。
用springboot+vue写一个前后分离的登录功能
好的,下面是一个简单的示例:
1. 后端使用Spring Boot搭建,创建一个名为"login"的Spring Boot项目。
2. 在项目中添加依赖:
```xml
<dependencies>
<!-- Spring Boot Web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Spring Boot Data JPA -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- MySQL Driver -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- Spring Security -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<!-- JSON Web Token -->
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
</dependencies>
```
3. 创建一个名为"User"的实体类,用于表示用户信息。
```java
@Entity
@Table(name = "users")
public class User implements UserDetails {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false, unique = true)
private String username;
@Column(nullable = false)
private String password;
@Column(nullable = false)
private String role;
// getters and setters
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return Arrays.asList(new SimpleGrantedAuthority(role));
}
@Override
public boolean isAccountNonExpired() {
return true;
}
@Override
public boolean isAccountNonLocked() {
return true;
}
@Override
public boolean isCredentialsNonExpired() {
return true;
}
@Override
public boolean isEnabled() {
return true;
}
}
```
4. 创建一个名为"UserRepository"的接口,用于操作用户数据。
```java
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
User findByUsername(String username);
}
```
5. 创建一个名为"JwtUtils"的工具类,用于生成和验证JSON Web Token。
```java
public class JwtUtils {
private static final String SECRET_KEY = "secret";
public static String generateToken(UserDetails userDetails) {
Map<String, Object> claims = new HashMap<>();
claims.put("username", userDetails.getUsername());
claims.put("role", userDetails.getAuthorities().stream().findFirst().get().getAuthority());
return Jwts.builder()
.setClaims(claims)
.setSubject(userDetails.getUsername())
.setExpiration(new Date(System.currentTimeMillis() + 60 * 60 * 1000))
.signWith(SignatureAlgorithm.HS512, SECRET_KEY)
.compact();
}
public static boolean validateToken(String token, UserDetails userDetails) {
String username = getUsernameFromToken(token);
return username.equals(userDetails.getUsername()) && !isTokenExpired(token);
}
public static String getUsernameFromToken(String token) {
return Jwts.parser().setSigningKey(SECRET_KEY).parseClaimsJws(token).getBody().getSubject();
}
public static boolean isTokenExpired(String token) {
return Jwts.parser().setSigningKey(SECRET_KEY).parseClaimsJws(token).getBody().getExpiration().before(new Date());
}
}
```
6. 创建一个名为"JwtAuthenticationFilter"的过滤器,用于处理登录请求并生成JSON Web Token。
```java
public class JwtAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
private final AuthenticationManager authenticationManager;
public JwtAuthenticationFilter(AuthenticationManager authenticationManager) {
this.authenticationManager = authenticationManager;
setFilterProcessesUrl("/api/login");
}
@Override
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
try {
User user = new ObjectMapper().readValue(request.getInputStream(), User.class);
return authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(user.getUsername(), user.getPassword(), Collections.emptyList()));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {
String token = JwtUtils.generateToken((UserDetails) authResult.getPrincipal());
response.setContentType("application/json");
response.getWriter().write("{\"token\": \"" + token + "\"}");
}
}
```
7. 创建一个名为"SecurityConfig"的配置类,用于配置Spring Security。
```java
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Autowired
private UserRepository userRepository;
@Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(username -> userRepository.findByUsername(username)).passwordEncoder(passwordEncoder());
}
@Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable()
.authorizeRequests()
.antMatchers("/api/login").permitAll()
.anyRequest().authenticated()
.and()
.addFilter(new JwtAuthenticationFilter(authenticationManager()))
.addFilter(new JwtAuthorizationFilter(authenticationManager()))
.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
}
}
```
8. 创建一个名为"JwtAuthorizationFilter"的过滤器,用于验证请求中的JSON Web Token。
```java
public class JwtAuthorizationFilter extends BasicAuthenticationFilter {
private static final String HEADER_STRING = "Authorization";
private static final String TOKEN_PREFIX = "Bearer ";
public JwtAuthorizationFilter(AuthenticationManager authenticationManager) {
super(authenticationManager);
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
String header = request.getHeader(HEADER_STRING);
if (header != null && header.startsWith(TOKEN_PREFIX)) {
String token = header.substring(TOKEN_PREFIX.length());
try {
String username = JwtUtils.getUsernameFromToken(token);
UserDetails userDetails = userDetailsService().loadUserByUsername(username);
if (JwtUtils.validateToken(token, userDetails)) {
UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
SecurityContextHolder.getContext().setAuthentication(authentication);
}
} catch (JwtException e) {
SecurityContextHolder.clearContext();
}
}
chain.doFilter(request, response);
}
}
```
9. 前端使用Vue.js搭建,创建一个名为"login"的Vue.js项目。
10. 在项目中安装axios和vue-router:
```
npm install --save axios vue-router
```
11. 创建一个名为"Login"的组件,用于渲染登录表单。
```vue
<template>
<div>
<h1>Login</h1>
<form @submit.prevent="login">
<div>
<label for="username">Username:</label>
<input type="text" id="username" v-model="username">
</div>
<div>
<label for="password">Password:</label>
<input type="password" id="password" v-model="password">
</div>
<div>
<button type="submit">Login</button>
</div>
</form>
</div>
</template>
<script>
import axios from 'axios'
export default {
data () {
return {
username: '',
password: ''
}
},
methods: {
login () {
axios.post('/api/login', { username: this.username, password: this.password })
.then(response => {
localStorage.setItem('token', response.data.token)
this.$router.push('/')
})
.catch(error => {
console.error(error)
})
}
}
}
</script>
```
12. 创建一个名为"App"的组件,用于渲染主页面。
```vue
<template>
<div>
<h1>Home</h1>
<div v-if="authenticated">
<p>Welcome, {{ username }}!</p>
<button @click="logout">Logout</button>
</div>
<div v-else>
<router-link to="/login">Login</router-link>
</div>
</div>
</template>
<script>
import axios from 'axios'
export default {
data () {
return {
authenticated: false,
username: ''
}
},
created () {
axios.get('/api/user')
.then(response => {
this.authenticated = true
this.username = response.data.username
})
.catch(error => {
console.error(error)
})
},
methods: {
logout () {
localStorage.removeItem('token')
this.$router.push('/')
location.reload()
}
}
}
</script>
```
13. 创建一个名为"router"的路由配置文件,用于配置Vue.js路由。
```js
import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from './components/Login.vue'
import App from './components/App.vue'
Vue.use(VueRouter)
const router = new VueRouter({
mode: 'history',
routes: [
{ path: '/', component: App },
{ path: '/login', component: Login }
]
})
router.beforeEach((to, from, next) => {
const token = localStorage.getItem('token')
if (to.path !== '/login' && !token) {
next('/login')
} else {
next()
}
})
export default router
```
14. 在"index.html"中添加Vue.js和axios的CDN链接:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
</head>
<body>
<div id="app"></div>
<script src="dist/build.js"></script>
</body>
</html>
```
15. 在"main.js"中创建Vue.js实例并挂载到DOM上:
```js
import Vue from 'vue'
import App from './components/App.vue'
import router from './router'
new Vue({
el: '#app',
router,
render: h => h(App)
})
```
16. 运行项目:
```
mvn spring-boot:run
```
```
npm run dev
```
现在你可以在浏览器中访问"http://localhost:8080"来测试登录功能了。