diff --git a/src/main/java/com/pt/controller/AdminController.java b/src/main/java/com/pt/controller/AdminController.java
index 8af5b56..71159e5 100644
--- a/src/main/java/com/pt/controller/AdminController.java
+++ b/src/main/java/com/pt/controller/AdminController.java
@@ -29,7 +29,11 @@
         Admin admin = adminService.findByUsernameAndPassword(username, password);
         if (admin != null) {
             ans.put("message", "Login successful");
-            ans.put("data", JWTUtils.generateToken(username, Constants.UserRole.ADMIN, Constants.DEFAULT_EXPIRE_TIME));
+            ans.put("data", Map.of(
+                    "token", JWTUtils.generateToken(username, Constants.UserRole.ADMIN, Constants.DEFAULT_EXPIRE_TIME),
+                    "uid", admin.getId(),
+                    "username", admin.getUsername()
+            ));
             return ResponseEntity.ok().body(ans);
         } else {
             ans.put("message", "Invalid username or password");
diff --git a/src/main/java/com/pt/controller/CommentController.java b/src/main/java/com/pt/controller/CommentController.java
index 00e091d..623d94a 100644
--- a/src/main/java/com/pt/controller/CommentController.java
+++ b/src/main/java/com/pt/controller/CommentController.java
@@ -1,13 +1,19 @@
 package com.pt.controller;
 
+import com.pt.Item.CommentInfo;
 import com.pt.constant.Constants;
+import com.pt.entity.Post;
+import com.pt.entity.User;
 import com.pt.service.CommentService;
+import com.pt.service.PostService;
+import com.pt.service.UserService;
 import com.pt.utils.JWTUtils;
 import com.pt.entity.Comment;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -20,6 +26,12 @@
     @Autowired
     private CommentService commentService;
 
+    @Autowired
+    private PostService postService;
+
+    @Autowired
+    private UserService userService;
+
     @PostMapping("/add")
     public ResponseEntity<?> addComment(
             @RequestHeader("token") String token,
@@ -28,6 +40,7 @@
         String content = request.get("content");
         String username = request.get("username");
         int postId = Integer.parseInt(request.get("postId"));
+        Integer reviewer = request.get("reviewer") != null ? Integer.parseInt(request.get("reviewer")) : null;
 
         Map<String, Object> ans = new HashMap<>();
 
@@ -36,7 +49,7 @@
             return ResponseEntity.badRequest().body(ans);
         }
 
-        commentService.addComment(content, username, postId);
+        commentService.addComment(content, username, postId, reviewer);
         ans.put("message", "Comment added successfully");
         return ResponseEntity.ok(ans);
     }
@@ -44,10 +57,9 @@
     @DeleteMapping("/delete")
     public ResponseEntity<?> deleteComment(
             @RequestHeader("token") String token,
-            @RequestBody Map<String, String> request
+            @RequestParam("username") String username,
+            @RequestParam("commentId") int commentId
     ) {
-        String username = request.get("username");
-        int commentId = Integer.parseInt(request.get("commentId"));
 
         Map<String, Object> ans = new HashMap<>();
 
@@ -74,10 +86,37 @@
             return ResponseEntity.badRequest().body(ans);
         }
 
+        Post post = postService.findPostById(postId);
         List<Comment> comments = commentService.getCommentsByPostId(postId);
+        List<CommentInfo> commentInfos = new ArrayList<>();
+        for(Comment comment : comments) {
+            CommentInfo commentInfo = new CommentInfo();
+            commentInfo.setCommentId(comment.getCommentId());
+            commentInfo.setContent(comment.getContent());
+            commentInfo.setWriter(comment.getWriter());
+            commentInfo.setPublishDate(comment.getPublishDate());
+
+            if(comment.getReviewer() != null) {
+                Comment r = commentService.getCommentById(comment.getReviewer());
+                if(r != null) {
+                    commentInfo.setReviewer(r.getWriter());
+                    commentInfo.setReviewerId(comment.getReviewer());
+                } else {
+                    commentInfo.setReviewer("Unknown Reviewer");
+                    commentInfo.setReviewerId(0);
+                }
+            } else {
+                commentInfo.setReviewer("");
+                commentInfo.setReviewerId(0);
+            }
+
+            commentInfos.add(commentInfo);
+        }
+
         ans.put("message", "Comments retrieved successfully");
         ans.put("data", Map.of(
-           "comments", comments
+                "content", post.getContent(),
+                "comments", commentInfos
         ));
         return ResponseEntity.ok(ans);
     }
diff --git a/src/main/java/com/pt/controller/PostController.java b/src/main/java/com/pt/controller/PostController.java
index 3723dbd..c61bd3e 100644
--- a/src/main/java/com/pt/controller/PostController.java
+++ b/src/main/java/com/pt/controller/PostController.java
@@ -44,12 +44,6 @@
             return ResponseEntity.badRequest().body(ans);
         }
 
-        Post existingPost = postService.findPostByTitle(title);
-        if (existingPost != null) {
-            ans.put("result", "Post with this title already exists");
-            return ResponseEntity.badRequest().body(ans);
-        }
-
         postService.createPost(title, content, author);
         ans.put("message", "Post created successfully");
         return ResponseEntity.ok(ans);
@@ -91,9 +85,15 @@
         if(date != null){
             posts.removeIf(post -> !post.getPublishDate().toString().equals(date));
         }
+
+        posts.sort(
+                // 按发布日期降序排序
+                (p1, p2) -> p2.getPublishDate().compareTo(p1.getPublishDate())
+        );
+
         ans.put("message", "Post retrieved successfully");
         ans.put("data", Map.of(
-                "post", posts
+                "posts", posts
         ));
         return ResponseEntity.ok(ans);
     }
@@ -108,11 +108,9 @@
     @DeleteMapping("/delete")
     public ResponseEntity<?> deletePost(
             @RequestHeader("token") String token,
-            @RequestBody Map<String, String> request
+            @RequestParam("username") String username,
+            @RequestParam("pid") int pid
     ) {
-        String username = request.get("username");
-        int pid = Integer.parseInt(request.get("pid"));
-
         Map<String, Object> ans = new HashMap<>();
 
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.ADMIN)){
diff --git a/src/main/java/com/pt/controller/TrackerController.java b/src/main/java/com/pt/controller/TrackerController.java
index edae09f..33d8831 100644
--- a/src/main/java/com/pt/controller/TrackerController.java
+++ b/src/main/java/com/pt/controller/TrackerController.java
@@ -23,6 +23,13 @@
             String ip = request.getRemoteAddr();
             Map<String, String[]> params = request.getParameterMap();
 
+            // 验证必要参数
+            if (!params.containsKey("username")) {
+                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
+                response.getWriter().write("Missing required parameter: username");
+                return;
+            }
+
             byte[] bencodedResponse = trackerService.handleAnnounce(params, ip);
 
             response.setContentType("application/x-bittorrent");
diff --git a/src/main/java/com/pt/controller/UserController.java b/src/main/java/com/pt/controller/UserController.java
index 7222f36..d9f53ab 100644
--- a/src/main/java/com/pt/controller/UserController.java
+++ b/src/main/java/com/pt/controller/UserController.java
@@ -77,7 +77,14 @@
         if (user != null) {
             String token = JWTUtils.generateToken(username, Constants.UserRole.USER, Constants.DEFAULT_EXPIRE_TIME);
             ans.put("message", "Login successful");
-            ans.put("data", token);
+            ans.put("data", Map.of(
+                    "token", token,
+                    "uid", user.getUid(),
+                    "username", user.getUsername(),
+                    "email", user.getEmail(),
+                    "level", user.getLevel(),
+                    "points", user.getPoints()
+            ));
             return ResponseEntity.ok().body(ans);
         } else {
             ans.put("message", "Invalid username or password");
@@ -160,9 +167,8 @@
 
     @DeleteMapping("/delete")
     public ResponseEntity<?> deleteUser(@RequestHeader("token") String token,
-                                        @RequestBody Map<String, String> request) {
-        String username = request.get("username");
-        String targetUsername = request.get("targetUsername");
+                                        @RequestParam("username") String username,
+                                        @RequestParam("targetUsername") String targetUsername) {
 
         Map<String, Object> ans = new HashMap<>();
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.ADMIN)) {
@@ -183,8 +189,7 @@
 
     @GetMapping("/list")
     public ResponseEntity<?> listUsers(@RequestHeader("token") String token,
-                                       @RequestBody Map<String, String> request) {
-        String username = request.get("username");
+                                       @RequestParam("username") String username) {
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.ADMIN)) {
             return ResponseEntity.badRequest().body("Invalid token");
         }
@@ -203,8 +208,10 @@
                                          @RequestParam("username") String username) {
 
         Map<String, Object> ans = new HashMap<>();
+        System.out.println("Enter user info ");
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
             ans.put("message", "Invalid token");
+            System.out.println("Invalid token");
             return ResponseEntity.badRequest().body(ans);
         }
 
@@ -212,10 +219,71 @@
         if (user != null) {
             ans.put("message", "User info retrieved successfully");
             ans.put("data", user);
+            System.out.println("User info retrieved successfully");
             return ResponseEntity.ok(ans);
         } else {
             ans.put("message", "User not found");
+            System.out.println("User not found");
             return ResponseEntity.badRequest().body(ans);
         }
     }
+
+    /**
+     * 获取用户统计信息
+     */
+    @GetMapping("/stats/{username}")
+    public ResponseEntity<?> getUserStats(
+            @RequestHeader("token") String token,
+            @PathVariable String username) {
+        
+        Map<String, Object> ans = new HashMap<>();
+        
+        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
+            ans.put("message", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
+        }
+
+        User user = userService.findByUsername(username);
+        if (user == null) {
+            ans.put("message", "User not found");
+            return ResponseEntity.badRequest().body(ans);
+        }
+
+        // 计算分享率
+        double ratio = user.getDownloaded() == 0 ? 
+            (user.getUploaded() > 0 ? Double.MAX_VALUE : 0) : 
+            (double) user.getUploaded() / user.getDownloaded();
+        
+        // 格式化分享率为两位小数
+        ratio = Math.round(ratio * 100.0) / 100.0;
+
+        // 构建返回数据
+        Map<String, Object> stats = new HashMap<>();
+        double uploadSize = user.getUploaded() / (1024.0 * 1024.0 * 1024.0);
+        double downloadSize = user.getDownloaded() / (1024.0 * 1024.0 * 1024.0);
+        
+        stats.put("uploadSize", uploadSize); // 转换为GB
+        stats.put("downloadSize", downloadSize); // 转换为GB
+        stats.put("ratio", ratio);
+        stats.put("points", user.getPoints());
+        stats.put("userClass", getUserClass(user.getLevel()));
+        stats.put("level", user.getLevel());
+
+        ans.put("message", "User stats retrieved successfully");
+        ans.put("data", stats);
+        return ResponseEntity.ok(ans);
+    }
+
+    /**
+     * 根据用户等级返回对应的用户类别名称
+     */
+    private String getUserClass(int level) {
+        switch (level) {
+            case 5: return "大佬";
+            case 4: return "专家";
+            case 3: return "熟练";
+            case 2: return "入门";
+            default: return "新用户";
+        }
+    }
 }