新增SaRouter.back()函数，用于停止匹配返回结果

sa-token-starter/sa-token-spring-boot-starter/src/main/java/cn/dev33/satoken/filter/SaServletFilter.java

@@ -14,6 +14,7 @@ import javax.servlet.ServletResponse;
 
 import org.springframework.core.annotation.Order;
 
+import cn.dev33.satoken.exception.BackResultException;
 import cn.dev33.satoken.exception.SaTokenException;
 import cn.dev33.satoken.exception.StopMatchException;
 import cn.dev33.satoken.router.SaRouter;
@@ -163,14 +164,13 @@ public class SaServletFilter implements Filter {
 			
 		} catch (Throwable e) {
 			// 1. 获取异常处理策略结果 
-			Object result = error.run(e);
-			String resultString = String.valueOf(result);
+			String result = (e instanceof BackResultException) ? e.getMessage() : String.valueOf(error.run(e));
 			
 			// 2. 写入输出流 
 			if(response.getContentType() == null) {
 				response.setContentType("text/plain; charset=utf-8"); 
 			}
-			response.getWriter().print(resultString);
+			response.getWriter().print(result);
 			return;
 		}
 		

sa-token-starter/sa-token-spring-boot-starter/src/main/java/cn/dev33/satoken/interceptor/SaRouteInterceptor.java

@@ -5,6 +5,7 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.web.servlet.HandlerInterceptor;
 
+import cn.dev33.satoken.exception.BackResultException;
 import cn.dev33.satoken.exception.StopMatchException;
 import cn.dev33.satoken.router.SaRouteFunction;
 import cn.dev33.satoken.servlet.model.SaRequestForServlet;
@@ -63,6 +64,14 @@ public class SaRouteInterceptor implements HandlerInterceptor {
 			try {
 				function.run(new SaRequestForServlet(request), new SaResponseForServlet(response), handler);
 			} catch (StopMatchException e) {
+				// 停止匹配，进入Controller 
+			} catch (BackResultException e) {
+				// 停止匹配，向前端输出结果 
+				if(response.getContentType() == null) {
+					response.setContentType("text/plain; charset=utf-8"); 
+				}
+				response.getWriter().print(e.getMessage());
+				return false;
 			}
 		}