Improve SFTP file view and upload handling

Add hidden-file toggle and search, prevent rapid-click path duplication, fix multipart upload headers, and raise backend upload size limits with clearer errors.

backend/src/main/java/com/sshmanager/exception/GlobalExceptionHandler.java

@@ -0,0 +1,42 @@
+package com.sshmanager.exception;
+
+import org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.multipart.MaxUploadSizeExceededException;
+import org.springframework.web.multipart.MultipartException;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(MaxUploadSizeExceededException.class)
+    public ResponseEntity<Map<String, String>> handleMaxUploadSize(MaxUploadSizeExceededException e) {
+        Map<String, String> err = new HashMap<>();
+        err.put("error", "上传失败：文件大小超过限制");
+        return ResponseEntity.status(HttpStatus.PAYLOAD_TOO_LARGE).body(err);
+    }
+
+    @ExceptionHandler(MultipartException.class)
+    public ResponseEntity<Map<String, String>> handleMultipart(MultipartException e) {
+        Throwable root = e;
+        while (root.getCause() != null && root.getCause() != root) {
+            root = root.getCause();
+        }
+
+        if (root instanceof FileSizeLimitExceededException
+            || (root.getMessage() != null && root.getMessage().contains("exceeds its maximum permitted size"))) {
+            Map<String, String> err = new HashMap<>();
+            err.put("error", "上传失败：文件大小超过限制");
+            return ResponseEntity.status(HttpStatus.PAYLOAD_TOO_LARGE).body(err);
+        }
+
+        Map<String, String> err = new HashMap<>();
+        err.put("error", "上传失败：表单解析异常");
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(err);
+    }
+}

backend/src/main/resources/application.yml

@@ -1,30 +1,34 @@
-server:
-  port: 48080
-
-spring:
-  web:
-    resources:
-      add-mappings: false  # 使用 SpaForwardConfig 统一处理静态与 SPA 回退
-  datasource:
-    url: jdbc:h2:file:./data/sshmanager;DB_CLOSE_DELAY=-1
-    driver-class-name: org.h2.Driver
-    username: sa
-    password:
-  h2:
-    console:
-      enabled: false
-  jpa:
-    hibernate:
-      ddl-auto: update
-    show-sql: false
-    properties:
-      hibernate:
-        format_sql: true
-        dialect: org.hibernate.dialect.H2Dialect
-    open-in-view: false
-
-# Encryption key for connection passwords (base64, 32 bytes for AES-256)
-sshmanager:
-  encryption-key: ${SSHMANAGER_ENCRYPTION_KEY:YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXoxMjM0NTY=}
-  jwt-secret: ${SSHMANAGER_JWT_SECRET:ssh-manager-jwt-secret-change-in-production}
-  jwt-expiration-ms: 86400000
+server:
+  port: 48080
+
+spring:
+  web:
+    resources:
+      add-mappings: false  # 使用 SpaForwardConfig 统一处理静态与 SPA 回退
+  servlet:
+    multipart:
+      max-file-size: 200MB
+      max-request-size: 200MB
+  datasource:
+    url: jdbc:h2:file:./data/sshmanager;DB_CLOSE_DELAY=-1
+    driver-class-name: org.h2.Driver
+    username: sa
+    password:
+  h2:
+    console:
+      enabled: false
+  jpa:
+    hibernate:
+      ddl-auto: update
+    show-sql: false
+    properties:
+      hibernate:
+        format_sql: true
+        dialect: org.hibernate.dialect.H2Dialect
+    open-in-view: false
+
+# Encryption key for connection passwords (base64, 32 bytes for AES-256)
+sshmanager:
+  encryption-key: ${SSHMANAGER_ENCRYPTION_KEY:YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXoxMjM0NTY=}
+  jwt-secret: ${SSHMANAGER_JWT_SECRET:ssh-manager-jwt-secret-change-in-production}
+  jwt-expiration-ms: 86400000