diff --git a/backend/src/main/java/com/openisle/controller/GlobalExceptionHandler.java b/backend/src/main/java/com/openisle/controller/GlobalExceptionHandler.java
index 7af18210b..461486827 100644
--- a/backend/src/main/java/com/openisle/controller/GlobalExceptionHandler.java
+++ b/backend/src/main/java/com/openisle/controller/GlobalExceptionHandler.java
@@ -30,7 +30,11 @@ public class GlobalExceptionHandler {
 
     @ExceptionHandler(Exception.class)
     public ResponseEntity<?> handleException(Exception ex) {
-        return ResponseEntity.badRequest().body(Map.of("error", ex.getMessage()));
+        String message = ex.getMessage();
+        if (message == null) {
+            message = ex.getClass().getSimpleName();
+        }
+        return ResponseEntity.badRequest().body(Map.of("error", message));
     }
 }
 
diff --git a/backend/src/main/java/com/openisle/controller/UserController.java b/backend/src/main/java/com/openisle/controller/UserController.java
index 1aef3a650..0501c07b1 100644
--- a/backend/src/main/java/com/openisle/controller/UserController.java
+++ b/backend/src/main/java/com/openisle/controller/UserController.java
@@ -75,7 +75,7 @@ public class UserController {
 
     @PutMapping("/me")
     public ResponseEntity<?> updateProfile(@RequestBody UpdateProfileDto dto,
-                                                 Authentication auth) {
+                                           Authentication auth) {
         User user = userService.updateProfile(auth.getName(), dto.getUsername(), dto.getIntroduction());
         return ResponseEntity.ok(Map.of(
                 "token", jwtService.generateToken(user.getUsername()),
@@ -239,6 +239,7 @@ public class UserController {
         dto.setFollowing(subscriptionService.countSubscribed(user.getUsername()));
         dto.setCreatedAt(user.getCreatedAt());
         dto.setLastPostTime(postService.getLastPostTime(user.getUsername()));
+        dto.setLastCommentTime(commentService.getLastCommentTimeOfUserByUserId(user.getId()));
         dto.setTotalViews(postService.getTotalViews(user.getUsername()));
         dto.setVisitedDays(userVisitService.countVisits(user.getUsername()));
         dto.setReadPosts(postReadService.countReads(user.getUsername()));
@@ -306,6 +307,7 @@ public class UserController {
         private long following;
         private java.time.LocalDateTime createdAt;
         private java.time.LocalDateTime lastPostTime;
+        private java.time.LocalDateTime lastCommentTime;
         private long totalViews;
         private long visitedDays;
         private long readPosts;
diff --git a/backend/src/main/java/com/openisle/repository/CommentRepository.java b/backend/src/main/java/com/openisle/repository/CommentRepository.java
index 1b4b8e092..12f20fecd 100644
--- a/backend/src/main/java/com/openisle/repository/CommentRepository.java
+++ b/backend/src/main/java/com/openisle/repository/CommentRepository.java
@@ -23,4 +23,8 @@ public interface CommentRepository extends JpaRepository<Comment, Long> {
     @org.springframework.data.jpa.repository.Query("SELECT COUNT(c) FROM Comment c WHERE c.author.username = :username AND c.createdAt >= :start")
     long countByAuthorAfter(@org.springframework.data.repository.query.Param("username") String username,
                             @org.springframework.data.repository.query.Param("start") java.time.LocalDateTime start);
+
+    @org.springframework.data.jpa.repository.Query("SELECT MAX(c.createdAt) FROM Comment c WHERE c.author.id = :userId")
+    java.time.LocalDateTime findLastCommentTimeOfUserByUserId(@org.springframework.data.repository.query.Param("userId") Long userId);
+
 }
diff --git a/backend/src/main/java/com/openisle/service/CommentService.java b/backend/src/main/java/com/openisle/service/CommentService.java
index ddae361f9..96ed10f4e 100644
--- a/backend/src/main/java/com/openisle/service/CommentService.java
+++ b/backend/src/main/java/com/openisle/service/CommentService.java
@@ -76,6 +76,10 @@ public class CommentService {
         return comment;
     }
 
+    public java.time.LocalDateTime getLastCommentTimeOfUserByUserId(Long userId) { // 根据用户id查询该用户最后回复时间
+        return commentRepository.findLastCommentTimeOfUserByUserId(userId);
+    }
+
     @Transactional
     public Comment addReply(String username, Long parentId, String content) {
         log.debug("addReply called by user {} for parent comment {}", username, parentId);
diff --git a/backend/src/main/resources/logback-spring.xml b/backend/src/main/resources/logback-spring.xml
new file mode 100644
index 000000000..f634b7664
--- /dev/null
+++ b/backend/src/main/resources/logback-spring.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <property name="LOG_PATH" value="${LOG_PATH:-logs}"/>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>${LOG_PATH}/app.log</file>
+        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <fileNamePattern>${LOG_PATH}/app-%d{yyyy-MM-dd-HH}.log</fileNamePattern>
+            <maxHistory>72</maxHistory>
+        </rollingPolicy>
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="${LOG_LEVEL:-INFO}">
+        <appender-ref ref="STDOUT"/>
+        <appender-ref ref="FILE"/>
+    </root>
+</configuration>
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 53f445be1..1b497d70d 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "core-js": "^3.8.3",
+        "cropperjs": "^1.6.2",
         "echarts": "^5.6.0",
         "ldrs": "^1.1.7",
         "markdown-it": "^14.1.0",
@@ -4434,6 +4435,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/cropperjs": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/cropperjs/-/cropperjs-1.6.2.tgz",
+      "integrity": "sha512-nhymn9GdnV3CqiEHJVai54TULFAE3VshJTXSqSJKa8yXAKyBKDWdhHarnlIPrshJ0WMFTGuFvG02YjLXfPiuOA==",
+      "license": "MIT"
+    },
     "node_modules/cross-spawn": {
       "version": "6.0.6",
       "resolved": "https://registry.npmmirror.com/cross-spawn/-/cross-spawn-6.0.6.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index ed41c14b4..372208730 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -9,6 +9,7 @@
   },
   "dependencies": {
     "core-js": "^3.8.3",
+    "cropperjs": "^1.6.2",
     "echarts": "^5.6.0",
     "ldrs": "^1.1.7",
     "markdown-it": "^14.1.0",
diff --git a/frontend/src/components/AvatarCropper.vue b/frontend/src/components/AvatarCropper.vue
new file mode 100644
index 000000000..2cb0a1d62
--- /dev/null
+++ b/frontend/src/components/AvatarCropper.vue
@@ -0,0 +1,142 @@
+<template>
+  <div v-if="show" class="cropper-modal">
+    <div class="cropper-body">
+      <div class="cropper-wrapper">
+        <img ref="image" :src="src" alt="to crop" />
+      </div>
+      <div class="cropper-actions">
+        <button class="cropper-btn" @click="$emit('close')">取消</button>
+        <button class="cropper-btn primary" @click="onConfirm">确定</button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script>
+import Cropper from 'cropperjs'
+import 'cropperjs/dist/cropper.css'
+
+export default {
+  name: 'AvatarCropper',
+  props: {
+    src: {
+      type: String,
+      required: true
+    },
+    show: {
+      type: Boolean,
+      default: false
+    }
+  },
+  emits: ['close', 'crop'],
+  data() {
+    return { cropper: null }
+  },
+  watch: {
+    show(val) {
+      if (val) {
+        this.$nextTick(() => this.init())
+      } else {
+        this.destroy()
+      }
+    }
+  },
+  mounted() {
+    if (this.show) {
+      this.init()
+    }
+  },
+  methods: {
+    init() {
+      const image = this.$refs.image
+      this.cropper = new Cropper(image, {
+        aspectRatio: 1,
+        viewMode: 1,
+        autoCropArea: 1,
+        responsive: true
+      })
+    },
+    destroy() {
+      if (this.cropper) {
+        this.cropper.destroy()
+        this.cropper = null
+      }
+    },
+    onConfirm() {
+      if (!this.cropper) return
+      this.cropper.getCroppedCanvas({ width: 256, height: 256 }).toBlob(blob => {
+        const file = new File([blob], 'avatar.png', { type: 'image/png' })
+        const url = URL.createObjectURL(blob)
+        this.$emit('crop', { file, url })
+        this.$emit('close')
+        this.destroy()
+      })
+    }
+  }
+}
+</script>
+
+<style scoped>
+.cropper-modal {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.8);
+  opacity: 1.0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.cropper-body {
+  background: var(--background-color);
+  padding: 10px;
+  border-radius: 6px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.cropper-wrapper {
+  width: 80vw;
+  height: 80vw;
+  max-width: 400px;
+  max-height: 400px;
+}
+
+.cropper-wrapper img {
+  max-width: 100%;
+}
+
+.cropper-actions {
+  margin-top: 10px;
+  display: flex;
+  gap: 10px;
+}
+
+.cropper-btn {
+  padding: 6px 12px;
+  border-radius: 4px;
+  color: var(--primary-color);
+  border: none;
+  background: transparent;
+  cursor: pointer;
+}
+
+.cropper-btn.primary {
+  background: var(--primary-color);
+  color: var(--text-color);
+  border-color: var(--primary-color);
+}
+
+@media (min-width: 768px) {
+  .cropper-wrapper {
+    width: 400px;
+    height: 400px;
+  }
+}
+</style>
+
diff --git a/frontend/src/views/ProfileView.vue b/frontend/src/views/ProfileView.vue
index 0a9308cc3..538830a6c 100644
--- a/frontend/src/views/ProfileView.vue
+++ b/frontend/src/views/ProfileView.vue
@@ -44,6 +44,10 @@
           <div class="profile-info-item-label">最后发帖时间:</div>
           <div class="profile-info-item-value">{{ formatDate(user.lastPostTime) }}</div>
         </div>
+        <div class="profile-info-item">
+          <div class="profile-info-item-label">最后评论时间:</div>
+          <div class="profile-info-item-value">{{ user.lastCommentTime!=null?formatDate(user.lastCommentTime):"暂无评论" }}</div>
+        </div>
         <div class="profile-info-item">
           <div class="profile-info-item-label">浏览量:</div>
           <div class="profile-info-item-value">{{ user.totalViews }}</div>
diff --git a/frontend/src/views/SettingsPageView.vue b/frontend/src/views/SettingsPageView.vue
index 01c5935ff..74ef61422 100644
--- a/frontend/src/views/SettingsPageView.vue
+++ b/frontend/src/views/SettingsPageView.vue
@@ -1,5 +1,11 @@
 <template>
   <div class="settings-page">
+    <AvatarCropper
+      :src="tempAvatar"
+      :show="showCropper"
+      @close="showCropper = false"
+      @crop="onCropped"
+    />
     <div v-if="isLoadingPage" class="loading-page">
       <l-hatch size="20" stroke="4" speed="3.5" color="var(--primary-color)"></l-hatch>
     </div>
@@ -59,11 +65,12 @@ import { API_BASE_URL, toast } from '../main'
 import { getToken, fetchCurrentUser, setToken } from '../utils/auth'
 import BaseInput from '../components/BaseInput.vue'
 import Dropdown from '../components/Dropdown.vue'
+import AvatarCropper from '../components/AvatarCropper.vue'
 import { hatch } from 'ldrs'
 hatch.register()
 export default {
   name: 'SettingsPageView',
-  components: { BaseInput, Dropdown },
+  components: { BaseInput, Dropdown, AvatarCropper },
   data() {
     return {
       username: '',
@@ -71,6 +78,8 @@ export default {
       usernameError: '',
       avatar: '',
       avatarFile: null,
+      tempAvatar: '',
+      showCropper: false,
       role: '',
       publishMode: 'DIRECT',
       passwordStrength: 'LOW',
@@ -101,15 +110,19 @@ export default {
   methods: {
     onAvatarChange(e) {
       const file = e.target.files[0]
-      this.avatarFile = file
       if (file) {
         const reader = new FileReader()
         reader.onload = () => {
-          this.avatar = reader.result
+          this.tempAvatar = reader.result
+          this.showCropper = true
         }
         reader.readAsDataURL(file)
       }
     },
+    onCropped({ file, url }) {
+      this.avatarFile = file
+      this.avatar = url
+    },
     fetchPublishModes() {
       return Promise.resolve([
         { id: 'DIRECT', name: '直接发布', icon: 'fas fa-bolt' },