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SpringBoot攔截器實現登錄攔截
pom.xml:
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.0.RELEASE</version> <relativePath/> </parent> <groupId>com.wyj</groupId> <artifactId>springboot-interceptor01</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springboot-interceptor01</name> <description>springboot攔截器</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <!-- springboot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <!-- lombok --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!-- thymeleaf --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> </dependencies> <build> <finalName>springboot-interceptor01</finalName> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
WebMvcConfigurer:繼承WebMvcConfigurationSupport類,重寫addInterceptors方法
/** * 在springboot2.0.0之后,WebMvcConfigurerAdapter已經過時了 * 會使用WebMvcConfigurer或者WebMvcConfigurationSupport替代 * * @author wyj * @create 2019-06-01 21:48 */@Configurationpublic class WebMvcConfigurer extends WebMvcConfigurationSupport { /** * 在springboot2.0.0之前繼承WebMvcConfigurerAdapter類,重寫addInterceptors方法 * * @param registry */// @Override// public void addInterceptors(InterceptorRegistry registry) {// /**// * 攔截器按照順序執行,如果不同攔截器攔截存在相同的URL,前面的攔截器會執行,后面的攔截器將不執行// */// registry.addInterceptor(new AuthorityInterceptor())// .addPathPatterns("/user/**");// super.addInterceptors(registry);// } /** * 在springboot2.0.0之后實現WebMvcConfigurer接口,重寫addInterceptors方法 * * @param registry */// @Override// public void addInterceptors(InterceptorRegistry registry) {// /**// * 攔截器按照順序執行,如果不同攔截器攔截存在相同的URL,前面的攔截器會執行,后面的攔截器將不執行// */// registry.addInterceptor(new AuthorityInterceptor())// .addPathPatterns("/user/**");// } /** * 在springboot2.0.0之后繼承WebMvcConfigurationSupport類,重寫addInterceptors方法 * * @param registry */ @Override protected void addInterceptors(InterceptorRegistry registry) { /** * 攔截器按照順序執行,如果不同攔截器攔截存在相同的URL,前面的攔截器會執行,后面的攔截器將不執行 */ registry.addInterceptor(new AuthorityInterceptor()) .addPathPatterns("/user/**"); super.addInterceptors(registry); }}
AuthorityInterceptor:實現HandlerInterceptor接口,重寫preHandle、postHandle、afterCompletion方法
preHandle:在請求處理之前進行調用(Controller方法調用之前) postHandle:請求處理之后進行調用,但是在視圖被渲染之前(Controller方法調用之后) afterCompletion:在整個請求結束之后被調用,也就是在DispatcherServlet 渲染了對應的視圖之后執行(主要是用于進行資源清理工作)
@Slf4jpublic class AuthorityInterceptor implements HandlerInterceptor { private static final Set<String> NOT_INTERCEPT_URI = new HashSet<>();//不攔截的URI static { NOT_INTERCEPT_URI.add("/user/login.html"); NOT_INTERCEPT_URI.add("/user/login"); } /** * 在請求處理之前進行調用(Controller方法調用之前) */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception { String uri = request.getRequestURI(); if (NOT_INTERCEPT_URI.contains(uri)) { log.info("不攔截" + uri); return true; } log.info("攔截" + uri); HttpSession session = request.getSession(); UserInfo userInfo = (UserInfo) session.getAttribute("user_info_in_the_session"); if (userInfo == null) { throw new RuntimeException("用戶未登陸"); } return true; } /** * 請求處理之后進行調用,但是在視圖被渲染之前(Controller方法調用之后) */ @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView mv) throws Exception { } /** * 在整個請求結束之后被調用,也就是在DispatcherServlet 渲染了對應的視圖之后執行 * (主要是用于進行資源清理工作) */ @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception ex) throws Exception { }}
UserController:
@Controller@RequestMapping(value = "/user")public class UserController { @RequestMapping(value = "/login.html") public String index() { return "login"; } @RequestMapping(value = "/login") public String login(User user) { //查詢數據庫,我這里直接寫死 User dbUser = new User(1, "zhangsan", "123456", "admin"); if (dbUser.getPassword().equals(user.getPassword())) { UserInfo userInfo = new UserInfo(dbUser.getId(), dbUser.getUsername(), dbUser.getRole()); HttpSession session = getRequest().getSession(); session.setAttribute("user_info_in_the_session", userInfo); return "admin"; } return "login"; } @RequestMapping(value = "/userInfo") @ResponseBody public String userInfo() { HttpSession session = getRequest().getSession(); UserInfo userInfo = (UserInfo) session.getAttribute("user_info_in_the_session"); return userInfo.toString(); } private HttpServletRequest getRequest() { return ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest(); }}
User:
@Data@NoArgsConstructor@AllArgsConstructorpublic class User implements Serializable { private int id; private String username; private String password; private String role;}
UserInfo: 用于存在用戶信息儲存在session中
@Data@NoArgsConstructor@AllArgsConstructorpublic class UserInfo implements Serializable { private int id; private String username; private String role;}
login.html:只是一個很簡單的登錄表單
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>登陸頁面</title></head><body><form action="/user/login" method="post"> 登陸:<br/> 用戶名:<input name="username" id="username" type="text"/><br/> 密碼:<input name="password" id="password" type="password"/><br/> <input type="submit" value="登陸"/></form></body></html>
admin.html:
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>首頁</title></head><body><form action="/user/userInfo" method="get"> <input type="submit" value="用戶信息"/></form></body></html>
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