diff --git a/src/main/java/com/pt/controller/AdminController.java b/src/main/java/com/pt/controller/AdminController.java
index 1ddfc92..22e2b86 100644
--- a/src/main/java/com/pt/controller/AdminController.java
+++ b/src/main/java/com/pt/controller/AdminController.java
@@ -31,7 +31,9 @@
         Admin admin = adminService.findByUsernameAndPassword(username, password);
         if (admin != null) {
             ans.put("result", "Login successful");
-            ans.put("token", JWTUtils.generateToken(username, Constants.UserRole.ADMIN, (int)1.2e8));
+            ans.put("data", Map.of(
+                    "token", JWTUtils.generateToken(username, Constants.UserRole.ADMIN, (int)1.2e8)
+            ));
             return ResponseEntity.ok().body(ans);
         } else {
             ans.put("result", "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 a85d131..17dabb3 100644
--- a/src/main/java/com/pt/controller/CommentController.java
+++ b/src/main/java/com/pt/controller/CommentController.java
@@ -72,7 +72,9 @@
 
         List<Comment> comments = commentService.getCommentsByPostId(postId);
         ans.put("result", "Comments retrieved successfully");
-        ans.put("comments", comments);
+        ans.put("data", Map.of(
+           "comments", comments
+        ));
         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 387cc2d..0ab86ed 100644
--- a/src/main/java/com/pt/controller/PostController.java
+++ b/src/main/java/com/pt/controller/PostController.java
@@ -92,7 +92,9 @@
             posts.removeIf(post -> !post.getPublishDate().toString().equals(date));
         }
         ans.put("result", "Post retrieved successfully");
-        ans.put("post", posts);
+        ans.put("data", Map.of(
+                "post", posts
+        ));
         return ResponseEntity.ok(ans);
     }
 
diff --git a/src/main/java/com/pt/controller/UserController.java b/src/main/java/com/pt/controller/UserController.java
index 3978831..7603f9d 100644
--- a/src/main/java/com/pt/controller/UserController.java
+++ b/src/main/java/com/pt/controller/UserController.java
@@ -43,8 +43,7 @@
             userService.save(newUser);
 
             Map<String, Object> ans = new HashMap<>();
-            ans.put("success", true);
-            ans.put("message", "User registered successfully");
+            ans.put("result", "User registered successfully");
             ans.put("data", newUser);
 
             return ResponseEntity.ok().body(ans);
@@ -52,9 +51,9 @@
     }
 
     @PostMapping("/login")
-    public ResponseEntity<?> loginUser(@RequestBody Map<String, String> request) {
-        String username = request.get("username");
-        String password = request.get("password");
+    public ResponseEntity<?> loginUser(@RequestParam("username") String username,
+                                       @RequestParam("password") String password) {
+
 
         if (username == null || password == null) {
             return ResponseEntity.badRequest().body("Missing username or password");
@@ -64,16 +63,11 @@
         Map<String, Object> ans = new HashMap<>();
         if (user != null) {
             String token = JWTUtils.generateToken(username, Constants.UserRole.USER, Constants.DEFAULT_EXPIRE_TIME);
-            ans.put("success", true);
-            ans.put("message", "Login successful");
-            ans.put("data", Map.of(
-                "token", token,
-                "user", user
-            ));
+            ans.put("result", "Login successful");
+            ans.put("data", token);
             return ResponseEntity.ok().body(ans);
         } else {
-            ans.put("success", false);
-            ans.put("message", "Invalid username or password");
+            ans.put("result", "Invalid username or password");
             return ResponseEntity.badRequest().body(ans);
         }
     }
@@ -82,17 +76,21 @@
     public ResponseEntity<?> updateUsername(@RequestHeader("token") String token,
                                             @RequestParam("username") String oldUsername,
                                             @RequestParam("newUsername") String newUsername) {
+        Map<String, Object> ans = new HashMap<>();
         if(!JWTUtils.checkToken(token, oldUsername, Constants.UserRole.USER)) {
-            return ResponseEntity.badRequest().body("Invalid token");
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
         }
 
         User user = userService.findByUsername(oldUsername);
         if (user != null) {
             user.setUsername(newUsername);
             userService.save(user);
-            return ResponseEntity.ok("Username updated successfully");
+            ans.put("result", "Username updated successfully");
+            return ResponseEntity.ok(ans);
         } else {
-            return ResponseEntity.badRequest().body("User not found");
+            ans.put("result", "User not found");
+            return ResponseEntity.badRequest().body(ans);
         }
     }
 
@@ -100,17 +98,21 @@
     public ResponseEntity<?> updatePassword(@RequestHeader("token") String token,
                                             @RequestParam("username") String username,
                                             @RequestParam("newPassword") String newPassword) {
+        Map<String, Object> ans = new HashMap<>();
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
-            return ResponseEntity.badRequest().body("Invalid token");
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
         }
 
         User user = userService.findByUsername(username);
         if (user != null) {
             user.setPassword(newPassword);
             userService.save(user);
-            return ResponseEntity.ok("Password updated successfully");
+            ans.put("result", "Password updated successfully");
+            return ResponseEntity.ok(ans);
         } else {
-            return ResponseEntity.badRequest().body("Invalid username or password");
+            ans.put("result", "Invalid username or password");
+            return ResponseEntity.badRequest().body(ans);
         }
     }
 
@@ -118,17 +120,22 @@
     public ResponseEntity<?> updateEmail(@RequestHeader("token") String token,
                                          @RequestParam("username") String username,
                                          @RequestParam("newEmail") String newEmail) {
+
+        Map<String, Object> ans = new HashMap<>();
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
-            return ResponseEntity.badRequest().body("Invalid token");
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
         }
 
         User user = userService.findByUsername(username);
         if (user != null) {
             user.setEmail(newEmail);
             userService.save(user);
-            return ResponseEntity.ok("Email updated successfully");
+            ans.put("result", "Email updated successfully");
+            return ResponseEntity.ok(ans);
         } else {
-            return ResponseEntity.badRequest().body("User not found");
+            ans.put("result", "User not found");
+            return ResponseEntity.badRequest().body(ans);
         }
     }
 
@@ -137,16 +144,20 @@
                                         @RequestParam("username") String username,
                                         @RequestParam("targetUsername") String targetUsername
     ) {
+        Map<String, Object> ans = new HashMap<>();
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.ADMIN)) {
-            return ResponseEntity.badRequest().body("Invalid token");
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
         }
 
         User user = userService.findByUsername(targetUsername);
         if (user != null) {
             userService.deleteById(user.getUid());
-            return ResponseEntity.ok("User deleted successfully");
+            ans.put("result", "User deleted successfully");
+            return ResponseEntity.ok(ans);
         } else {
-            return ResponseEntity.badRequest().body("User not found");
+            ans.put("result", "User not found");
+            return ResponseEntity.badRequest().body(ans);
         }
     }
 
@@ -159,26 +170,30 @@
 
         Map<String, Object> ans = new HashMap<>();
         ans.put("result", "User list retrieved successfully");
-        ans.put("amount", userService.listAll().size());
-        ans.put("users", userService.listAll());
+        ans.put("data", Map.of(
+                "amount", userService.listAll().size(),
+                "users", userService.listAll()
+        ));
         return ResponseEntity.ok(ans);
     }
 
     @GetMapping("/get/info")
     public ResponseEntity<?> getUserInfo(@RequestHeader("token") String token,
                                          @RequestParam("username") String username) {
+        Map<String, Object> ans = new HashMap<>();
         if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
-            return ResponseEntity.badRequest().body("Invalid token");
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
         }
 
         User user = userService.findByUsername(username);
         if (user != null) {
-            Map<String, Object> ans = new HashMap<>();
             ans.put("result", "User info retrieved successfully");
-            ans.put("user", user);
+            ans.put("data", user);
             return ResponseEntity.ok(ans);
         } else {
-            return ResponseEntity.badRequest().body("User not found");
+            ans.put("result", "User not found");
+            return ResponseEntity.badRequest().body(ans);
         }
     }
 }
diff --git a/src/main/java/com/pt/utils/BdecodeUtils.java b/src/main/java/com/pt/utils/BdecodeUtils.java
new file mode 100644
index 0000000..c77f8b4
--- /dev/null
+++ b/src/main/java/com/pt/utils/BdecodeUtils.java
@@ -0,0 +1,84 @@
+package com.pt.utils;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.*;
+
+public class BdecodeUtils {
+    public static Object decode(byte[] data) throws IOException {
+        try (ByteArrayInputStream in = new ByteArrayInputStream(data)) {
+            return decodeNext(in);
+        }
+    }
+
+    private static Object decodeNext(InputStream in) throws IOException {
+        int prefix = in.read();
+        if (prefix == -1) {
+            throw new IOException("Unexpected end of stream");
+        }
+
+        if (prefix >= '0' && prefix <= '9') {
+            // 字符串，回退一个字节给parseString处理
+            in.reset();
+            return parseString(in, prefix);
+        } else if (prefix == 'i') {
+            return parseInteger(in);
+        } else if (prefix == 'l') {
+            return parseList(in);
+        } else if (prefix == 'd') {
+            return parseDict(in);
+        } else {
+            throw new IOException("Invalid bencode prefix: " + (char) prefix);
+        }
+    }
+
+    private static String parseString(InputStream in, int firstDigit) throws IOException {
+        // 读长度前缀
+        StringBuilder lenStr = new StringBuilder();
+        lenStr.append((char) firstDigit);
+        int b;
+        while ((b = in.read()) != -1 && b != ':') {
+            lenStr.append((char) b);
+        }
+        int length = Integer.parseInt(lenStr.toString());
+
+        // 读内容
+        byte[] buf = new byte[length];
+        int read = in.read(buf);
+        if (read < length) throw new IOException("Unexpected end of stream reading string");
+        return new String(buf);
+    }
+
+    private static long parseInteger(InputStream in) throws IOException {
+        StringBuilder intStr = new StringBuilder();
+        int b;
+        while ((b = in.read()) != -1 && b != 'e') {
+            intStr.append((char) b);
+        }
+        return Long.parseLong(intStr.toString());
+    }
+
+    private static List<Object> parseList(InputStream in) throws IOException {
+        List<Object> list = new ArrayList<>();
+        int b;
+        while ((b = in.read()) != 'e') {
+            in.reset();
+            list.add(decodeNext(in));
+        }
+        return list;
+    }
+
+    private static Map<String, Object> parseDict(InputStream in) throws IOException {
+        Map<String, Object> map = new LinkedHashMap<>();
+        int b;
+        while ((b = in.read()) != 'e') {
+            in.reset();
+            String key = (String) decodeNext(in);
+            Object value = decodeNext(in);
+            map.put(key, value);
+        }
+        return map;
+    }
+}
+
diff --git a/src/main/java/com/pt/utils/BencodeUtils.java b/src/main/java/com/pt/utils/BencodeUtils.java
new file mode 100644
index 0000000..2d3850d
--- /dev/null
+++ b/src/main/java/com/pt/utils/BencodeUtils.java
@@ -0,0 +1,107 @@
+package com.pt.utils;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+
+public class BencodeUtils {
+
+    // 通用bencode编码接口
+    public static void encode(Object obj, OutputStream out) throws IOException {
+        if (obj instanceof String) {
+            encodeString((String) obj, out);
+        } else if (obj instanceof Number) {
+            encodeInteger(((Number) obj).longValue(), out);
+        } else if (obj instanceof byte[]) {
+            encodeBytes((byte[]) obj, out);
+        } else if (obj instanceof List) {
+            encodeList((List<?>) obj, out);
+        } else if (obj instanceof Map) {
+            encodeMap((Map<String, Object>) obj, out);
+        } else {
+            throw new IllegalArgumentException("Unsupported type: " + obj.getClass());
+        }
+    }
+
+    public static byte[] encode(Object obj) {
+        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+            encode(obj, baos);
+            return baos.toByteArray();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static void encodeString(String s, OutputStream out) throws IOException {
+        byte[] bytes = s.getBytes(StandardCharsets.UTF_8);
+        out.write(String.valueOf(bytes.length).getBytes(StandardCharsets.US_ASCII));
+        out.write(':');
+        out.write(bytes);
+    }
+
+    private static void encodeBytes(byte[] bytes, OutputStream out) throws IOException {
+        out.write(String.valueOf(bytes.length).getBytes(StandardCharsets.US_ASCII));
+        out.write(':');
+        out.write(bytes);
+    }
+
+    private static void encodeInteger(long value, OutputStream out) throws IOException {
+        out.write('i');
+        out.write(Long.toString(value).getBytes(StandardCharsets.US_ASCII));
+        out.write('e');
+    }
+
+    private static void encodeList(List<?> list, OutputStream out) throws IOException {
+        out.write('l');
+        for (Object item : list) {
+            encode(item, out);
+        }
+        out.write('e');
+    }
+
+    private static void encodeMap(Map<String, Object> map, OutputStream out) throws IOException {
+        out.write('d');
+        List<String> keys = new ArrayList<>(map.keySet());
+        Collections.sort(keys);  // bencode字典必须按key排序
+        for (String key : keys) {
+            encodeString(key, out);
+            encode(map.get(key), out);
+        }
+        out.write('e');
+    }
+
+    // 构造单个compact peer的二进制格式 (4字节IP + 2字节端口)
+    public static byte[] buildCompactPeer(String ip, int port) {
+        try {
+            InetAddress addr = InetAddress.getByName(ip);
+            ByteBuffer buffer = ByteBuffer.allocate(6);
+            buffer.put(addr.getAddress());
+            buffer.putShort((short) port);
+            return buffer.array();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    // 构造多个compact peer的二进制拼接
+    public static byte[] buildCompactPeers(List<String> ips, List<Integer> ports) {
+        if (ips.size() != ports.size()) throw new IllegalArgumentException("IPs and ports list size mismatch");
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        for (int i = 0; i < ips.size(); i++) {
+            out.write(buildCompactPeer(ips.get(i), ports.get(i)), 0, 6);
+        }
+        return out.toByteArray();
+    }
+
+    // 构造tracker响应字典，至少包含interval和peers
+    public static byte[] buildTrackerResponse(int interval, byte[] peersCompact) {
+        Map<String, Object> dict = new LinkedHashMap<>();
+        dict.put("interval", interval);
+        dict.put("peers", peersCompact);
+        return encode(dict);
+    }
+}