tlias管理系统-过滤器Filter入门程序

tlias-web-management/src/main/java/com/inmind/TliasWebManagementApplication.java

@@ -2,7 +2,9 @@ package com.inmind;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.ServletComponentScan;
 
+@ServletComponentScan//开启对servlet组件的支持
 @SpringBootApplication
 public class TliasWebManagementApplication {
 

tlias-web-management/src/main/java/com/inmind/controller/LoginController.java

@@ -3,12 +3,16 @@ package com.inmind.controller;
 import com.inmind.pojo.Emp;
 import com.inmind.pojo.Result;
 import com.inmind.service.EmpService;
+import com.inmind.utils.JwtUtils;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.util.HashMap;
+import java.util.Map;
+
 @RestController
 @Slf4j
 public class LoginController {
@@ -23,6 +27,17 @@ public class LoginController {
         log.info("登录操作:{}",emp);
         //调用员工业务层查询功能
         Emp e = empService.getEmpByUserNameAndPassWord(emp);
-        return e != null?Result.success():Result.error("用户名或密码错误");
+        //登录成功，生成令牌，下发令牌
+        if (e != null) {
+            //生成令牌
+            Map<String, Object> claims = new HashMap<>();
+            claims.put("id", e.getId());
+            claims.put("name", e.getName());
+            claims.put("username", e.getUsername());
+            String jwt = JwtUtils.generateJwt(claims);
+            return Result.success(jwt);
+        }
+
+        return Result.error("用户名或密码错误");
     }
 }

tlias-web-management/src/main/java/com/inmind/filter/DemoFilter.java

@@ -0,0 +1,31 @@
+package com.inmind.filter;
+
+import lombok.extern.slf4j.Slf4j;
+
+import javax.servlet.*;
+import javax.servlet.annotation.WebFilter;
+import java.io.IOException;
+
+@Slf4j
+@WebFilter(urlPatterns = "/*")//标识为过滤器组件，拦截所有请求
+public class DemoFilter implements Filter {
+    @Override
+    public void init(FilterConfig filterConfig) throws ServletException {
+        Filter.super.init(filterConfig);
+        log.info("init方法，过滤器的初始化方法执行了");
+    }
+
+    //拦截到请求之后，调用多次
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+        log.info("doFilter方法，过滤器的拦截方法执行了");
+        //放行API
+        filterChain.doFilter(servletRequest,servletResponse);
+    }
+
+    @Override
+    public void destroy() {
+        Filter.super.destroy();
+        log.info("destroy方法，过滤器的销毁方法执行了");
+    }
+}

tlias-web-management/src/main/java/com/inmind/utils/JwtUtils.java

@@ -0,0 +1,44 @@
+package com.inmind.utils;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+
+import java.util.Date;
+import java.util.Map;
+
+public class JwtUtils {
+
+    private static String signKey = "inmind";
+    private static Long expriation =  60 * 60 * 1000L;
+
+    //生成令牌
+
+    /**
+     *
+     * @param claims 自定义载荷数据（json数据）
+     * @return 令牌字符串
+     */
+    public static String generateJwt(Map<String, Object> claims){
+        String jwt = Jwts.builder().signWith(SignatureAlgorithm.HS256, signKey)
+                .setClaims(claims)//设置载荷（自定义数据，用户信息数据）
+                .setExpiration(new Date(System.currentTimeMillis()+expriation))//设置过期时间（有效时间为1小时）
+                .compact();
+        return jwt;
+    }
+
+    //解析令牌
+    /**
+     *
+     * @param jwt 要校验的令牌字符串
+     * @return 解析之后的载荷数据
+     */
+    public static Claims  parseJWT(String jwt){
+        Claims claims = Jwts.parser()
+                .setSigningKey(signKey)//设置签名秘钥（解析JWT时，最重要的就是输入正确的签名秘钥）
+                .parseClaimsJws(jwt)
+                .getBody();
+        return claims;
+    }
+
+}