--author:scott--date:20260310--for:issues/9388 新增多租户上下文过滤器，支持从请求头获取租户ID并设置到TenantContext

jeecg-boot/jeecg-boot-base-core/src/main/java/org/jeecg/config/security/TenantContextFilter.java

@@ -0,0 +1,39 @@
+package org.jeecg.config.security;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
+import org.jeecg.common.config.TenantContext;
+import org.jeecg.common.constant.CommonConstant;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+
+/**
+ * 多租户上下文过滤器
+ * 从请求头中获取租户ID并设置到TenantContext中
+ * 对应shiro版本中JwtFilter里的TenantContext.setTenant逻辑
+ *
+ * @author jeecg-boot
+ */
+@Slf4j
+@Component
+public class TenantContextFilter extends OncePerRequestFilter {
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
+            throws ServletException, IOException {
+        // 从请求头获取租户ID并设置到TenantContext（多租户用到）
+        String tenantId = request.getHeader(CommonConstant.TENANT_ID);
+        TenantContext.setTenant(tenantId);
+        try {
+            filterChain.doFilter(request, response);
+        } finally {
+            // 请求结束后清除，防止线程复用导致租户信息污染
+            TenantContext.clear();
+        }
+    }
+}