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源碼
GitHub:https://github.com/291685399/springboot-learning/tree/master/springboot-interceptor01
SpringBoot攔截器可以做什么
可以對URL路徑進行攔截,可以用于權限驗證、解決亂碼、操作日志記錄、性能監控、異常處理等
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 */ @Configuration public 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
@Slf4j public 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 @AllArgsConstructor public 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 @AllArgsConstructor public 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>
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持億速云。
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