Refactor Docker setup and enhance file transfer progress handling. Updated Dockerfile for multi-stage builds, modified docker-compose.yml to include image and container name, and improved progress bar functionality in app.js for better user feedback during file transfers.

Dockerfile

@@ -1,12 +1,27 @@
-# 构建阶段：先执行 mvn clean package 生成 target/sftp-manager-1.0.0.jar
+# ========== 阶段一：Maven 构建 ==========
+FROM eclipse-temurin:8-jdk-alpine AS builder
+
+WORKDIR /build
+
+# 先只复制 pom，利用 Docker 缓存依赖层
+COPY pom.xml .
+RUN mvn dependency:go-offline -B -q
+
+# 复制源码并打包（跳过测试，加快构建）
+COPY src ./src
+RUN mvn clean package -DskipTests -B -q
+
+# ========== 阶段二：运行 ==========
 FROM eclipse-temurin:8-jre-alpine
 
-VOLUME /tmp
-ARG JAR_FILE=target/sftp-manager-1.0.0.jar
+WORKDIR /app
 
-COPY ${JAR_FILE} app.jar
+# 从构建阶段复制 jar
+COPY --from=builder /build/target/sftp-manager-1.0.0.jar app.jar
 
-# 数据与日志目录
+# 数据与日志目录（挂载卷时会覆盖）
 RUN mkdir -p /app/data /app/logs
 
-ENTRYPOINT ["java", "-jar", "/app.jar"]
+EXPOSE 48081
+
+ENTRYPOINT ["java", "-jar", "app.jar"]