统一 Gson 使用，改为依赖注入方式

- 在 GsonConfig 中统一配置 Gson Bean（lenient 模式）
- 所有 Service 类通过构造函数注入 Gson 实例
- RetrofitFactory、BlockchainService、PolymarketApiKeyService 等统一使用注入的 Gson
- AccountService、PositionCheckService 添加 JsonUtils 注入
- OnChainWsUtils（object 单例）使用私有 Gson 实例（与 GsonConfig 配置一致）
- 移除所有 GsonConverterFactory.create() 无参调用，统一使用注入的 Gson

backend/src/main/kotlin/com/wrbug/polymarketbot/config/GsonConfig.kt

@@ -0,0 +1,26 @@
+package com.wrbug.polymarketbot.config
+
+import com.google.gson.Gson
+import com.google.gson.GsonBuilder
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+/**
+ * Gson 配置类
+ * 统一配置 Gson 实例，使用 lenient 模式允许解析格式不严格的 JSON
+ */
+@Configuration
+class GsonConfig {
+    
+    /**
+     * 创建 Gson Bean
+     * 使用 lenient 模式，允许解析格式不严格的 JSON
+     */
+    @Bean
+    fun gson(): Gson {
+        return GsonBuilder()
+            .setLenient()
+            .create()
+    }
+}
+

backend/src/main/kotlin/com/wrbug/polymarketbot/config/RetrofitConfig.kt

@@ -1,5 +1,6 @@
 package com.wrbug.polymarketbot.config
 
+import com.google.gson.Gson
 import com.wrbug.polymarketbot.api.PolymarketClobApi
 import com.wrbug.polymarketbot.util.createClient
 import org.springframework.beans.factory.annotation.Value
@@ -18,7 +19,9 @@ import retrofit2.converter.gson.GsonConverterFactory
  * - 账户 API Key 在调用时动态设置，不在此处配置
  */
 @Configuration
-class RetrofitConfig {
+class RetrofitConfig(
+    private val gson: Gson
+) {
     
     @Value("\${polymarket.clob.base-url}")
     private lateinit var clobBaseUrl: String
@@ -37,7 +40,7 @@ class RetrofitConfig {
         return Retrofit.Builder()
             .baseUrl(clobBaseUrl)
             .client(okHttpClient)
-            .addConverterFactory(GsonConverterFactory.create())
+            .addConverterFactory(GsonConverterFactory.create(gson))
             .build()
             .create(PolymarketClobApi::class.java)
     }

backend/src/main/kotlin/com/wrbug/polymarketbot/service/accounts/AccountService.kt

@@ -37,7 +37,8 @@ class AccountService(
     private val orderSigningService: OrderSigningService,
     private val cryptoUtils: CryptoUtils,
     private val telegramNotificationService: TelegramNotificationService? = null,  // 可选，避免循环依赖
-    private val relayClientService: RelayClientService
+    private val relayClientService: RelayClientService,
+    private val jsonUtils: JsonUtils
 ) {
 
     private val logger = LoggerFactory.getLogger(AccountService::class.java)
@@ -1121,7 +1122,7 @@ class AccountService(
                     // 如果目标 outcome 不是第一个（index != 0），需要转换价格
                     // 对于二元市场：第二个 outcome 的价格 = 1 - 第一个 outcome 的价格
                     if (outcomeIndex != null && outcomeIndex > 0) {
-                        val outcomes = JsonUtils.parseStringArray(market.outcomes)
+                        val outcomes = jsonUtils.parseStringArray(market.outcomes)
                         // 只对二元市场进行价格转换
                         if (outcomes.size == 2) {
                             // 保存原始第一个 outcome 的价格

backend/src/main/kotlin/com/wrbug/polymarketbot/service/accounts/PositionCheckService.kt

@@ -48,7 +48,8 @@ class PositionCheckService(
     private val accountRepository: AccountRepository,
     private val messageSource: MessageSource,
     private val retrofitFactory: RetrofitFactory,
-    private val blockchainService: BlockchainService
+    private val blockchainService: BlockchainService,
+    private val jsonUtils: JsonUtils
 ) {
     
     private val logger = LoggerFactory.getLogger(PositionCheckService::class.java)
@@ -582,7 +583,7 @@ class PositionCheckService(
             // 优先使用 outcomePrices（结算价格数组）
             val outcomePrices = market.outcomePrices
             if (outcomePrices != null && outcomePrices.isNotBlank()) {
-                val prices = JsonUtils.parseStringArray(outcomePrices)
+                val prices = jsonUtils.parseStringArray(outcomePrices)
                 if (outcomeIndex < prices.size) {
                     val price = prices[outcomeIndex].toSafeBigDecimal()
                     // 如果价格 >= 0.99，认为赢了

backend/src/main/kotlin/com/wrbug/polymarketbot/service/common/BlockchainService.kt

@@ -1,5 +1,6 @@
 package com.wrbug.polymarketbot.service.common
 
+import com.google.gson.Gson
 import com.wrbug.polymarketbot.api.EthereumRpcApi
 import com.wrbug.polymarketbot.api.JsonRpcRequest
 import com.wrbug.polymarketbot.api.JsonRpcResponse
@@ -29,7 +30,8 @@ class BlockchainService(
     private val dataApiBaseUrl: String,
     private val retrofitFactory: RetrofitFactory,
     private val relayClientService: RelayClientService,
-    private val rpcNodeService: RpcNodeService
+    private val rpcNodeService: RpcNodeService,
+    private val gson: Gson
 ) {
     
     private val logger = LoggerFactory.getLogger(BlockchainService::class.java)
@@ -64,7 +66,7 @@ class BlockchainService(
         Retrofit.Builder()
             .baseUrl("$baseUrl/")
             .client(okHttpClient)
-            .addConverterFactory(GsonConverterFactory.create())
+            .addConverterFactory(GsonConverterFactory.create(gson))
             .build()
             .create(PolymarketDataApi::class.java)
     }

backend/src/main/kotlin/com/wrbug/polymarketbot/service/common/PolymarketApiKeyService.kt

@@ -1,5 +1,6 @@
 package com.wrbug.polymarketbot.service.common
 
+import com.google.gson.Gson
 import com.wrbug.polymarketbot.api.ApiKeyResponse
 import com.wrbug.polymarketbot.api.PolymarketClobApi
 import com.wrbug.polymarketbot.util.PolymarketL1AuthInterceptor
@@ -19,7 +20,8 @@ import retrofit2.converter.gson.GsonConverterFactory
 @Service
 class PolymarketApiKeyService(
     @Value("\${polymarket.clob.base-url}")
-    private val clobBaseUrl: String
+    private val clobBaseUrl: String,
+    private val gson: Gson
 ) {
     
     private val logger = LoggerFactory.getLogger(PolymarketApiKeyService::class.java)
@@ -222,7 +224,7 @@ class PolymarketApiKeyService(
         return Retrofit.Builder()
             .baseUrl(clobBaseUrl)
             .client(okHttpClient)
-            .addConverterFactory(GsonConverterFactory.create())
+            .addConverterFactory(GsonConverterFactory.create(gson))
             .build()
             .create(PolymarketClobApi::class.java)
     }
@@ -236,7 +238,7 @@ class PolymarketApiKeyService(
         return Retrofit.Builder()
             .baseUrl(clobBaseUrl)
             .client(okHttpClient)
-            .addConverterFactory(GsonConverterFactory.create())
+            .addConverterFactory(GsonConverterFactory.create(gson))
             .build()
             .create(PolymarketClobApi::class.java)
     }

backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/monitor/CopyTradingWebSocketService.kt

@@ -22,15 +22,14 @@ import java.util.concurrent.ConcurrentHashMap
 @Service
 class CopyTradingWebSocketService(
     private val copyOrderTrackingService: CopyOrderTrackingService,
-    private val templateRepository: CopyTradingTemplateRepository
+    private val templateRepository: CopyTradingTemplateRepository,
+    private val gson: Gson
 ) {
     
     private val logger = LoggerFactory.getLogger(CopyTradingWebSocketService::class.java)
     
     @Value("\${polymarket.websocket.url:wss://ws-live-data.polymarket.com}")
     private var websocketUrl: String = "wss://ws-live-data.polymarket.com"
-    
-    private val gson = Gson()
     private val scope = CoroutineScope(Dispatchers.Default + SupervisorJob())
     
     // 存储每个Leader的WebSocket客户端：leaderId -> WebSocketClient

backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/monitor/OnChainWsUtils.kt

@@ -1,5 +1,7 @@
 package com.wrbug.polymarketbot.service.copytrading.monitor
 
+import com.google.gson.Gson
+import com.google.gson.GsonBuilder
 import com.google.gson.JsonArray
 import com.google.gson.reflect.TypeToken
 import com.wrbug.polymarketbot.api.*
@@ -19,6 +21,29 @@ object OnChainWsUtils {
     
     private val logger = LoggerFactory.getLogger(OnChainWsUtils::class.java)
     
+    // 创建 Gson 实例（与 GsonConfig 中的配置一致，使用 lenient 模式）
+    private val gson: Gson = GsonBuilder()
+        .setLenient()
+        .create()
+    
+    /**
+     * 解析 JSON 字符串数组
+     * @param jsonString JSON 字符串，如 "[\"Yes\", \"No\"]"
+     * @return 字符串列表，如果解析失败返回空列表
+     */
+    private fun parseStringArray(jsonString: String?): List<String> {
+        if (jsonString.isNullOrBlank()) {
+            return emptyList()
+        }
+        
+        return try {
+            val listType = object : TypeToken<List<String>>() {}.type
+            gson.fromJson<List<String>>(jsonString, listType) ?: emptyList()
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
+    
     // 合约地址
     const val USDC_CONTRACT = "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174"
     const val ERC1155_CONTRACT = "0x4d97dcd97ec945f40cf65f87097ace5ea0476045"
@@ -240,24 +265,17 @@ object OnChainWsUtils {
             val clobTokenIds = when {
                 clobTokenIdsRaw == null -> null
                 else -> {
-                    try {
+                    // 解析 JSON 字符串
-                        // 尝试解析 JSON 字符串
+                    parseStringArray(clobTokenIdsRaw)
-                        val gson = com.google.gson.Gson()
-                        val listType = object : com.google.gson.reflect.TypeToken<List<String>>() {}.type
-                        gson.fromJson<List<String>>(clobTokenIdsRaw, listType)
-                    } catch (e: Exception) {
-                        // 如果不是 JSON 字符串，可能是其他格式，返回 null
-                        null
-                    }
                 }
             }
             
             // 解析 outcomes（可能是 JSON 字符串或数组）
-            val outcomes = com.wrbug.polymarketbot.util.JsonUtils.parseStringArray(market.outcomes)
+            val outcomes = parseStringArray(market.outcomes)
             
             // 查找 tokenId 在 clobTokenIds 中的索引
-            val outcomeIndex = clobTokenIds?.indexOfFirst { 
+            val outcomeIndex = clobTokenIds?.indexOfFirst { token ->
-                it.equals(tokenId, ignoreCase = true)
+                token.equals(tokenId, ignoreCase = true)
             }?.takeIf { it >= 0 }
             
             // 获取 outcome 名称

backend/src/main/kotlin/com/wrbug/polymarketbot/service/copytrading/monitor/UnifiedOnChainWsService.kt

@@ -27,14 +27,12 @@ import java.util.concurrent.ConcurrentHashMap
 @Service
 class UnifiedOnChainWsService(
     private val rpcNodeService: RpcNodeService,
-    private val retrofitFactory: RetrofitFactory
+    private val retrofitFactory: RetrofitFactory,
+    private val gson: Gson
 ) {
     
     private val logger = LoggerFactory.getLogger(UnifiedOnChainWsService::class.java)
     
-    // Gson 实例，用于解析 JSON
-    private val gson = Gson()
-    
     @Value("\${copy.trading.onchain.ws.reconnect.delay:3000}")
     private var reconnectDelay: Long = 3000  // 重连延迟（毫秒），默认3秒
     

backend/src/main/kotlin/com/wrbug/polymarketbot/util/JsonUtils.kt

@@ -2,14 +2,16 @@ package com.wrbug.polymarketbot.util
 
 import com.google.gson.Gson
 import com.google.gson.reflect.TypeToken
+import org.springframework.stereotype.Component
 
 /**
  * JSON 工具类
  * 用于解析 JSON 字符串
  */
-object JsonUtils {
+@Component
-    
+class JsonUtils(
-    private val gson = Gson()
+    private val gson: Gson
+) {
     
     /**
      * 解析 JSON 字符串数组

backend/src/main/kotlin/com/wrbug/polymarketbot/util/RetrofitFactory.kt

@@ -1,7 +1,6 @@
 package com.wrbug.polymarketbot.util
 
 import com.google.gson.Gson
-import com.google.gson.GsonBuilder
 import com.wrbug.polymarketbot.api.BuilderRelayerApi
 import com.wrbug.polymarketbot.api.EthereumRpcApi
 import com.wrbug.polymarketbot.api.GitHubApi
@@ -34,7 +33,8 @@ class RetrofitFactory(
     @Value("\${polymarket.clob.base-url}")
     private val clobBaseUrl: String,
     @Value("\${polymarket.gamma.base-url}")
-    private val gammaBaseUrl: String
+    private val gammaBaseUrl: String,
+    private val gson: Gson
 ) {
     
     /**
@@ -61,11 +61,6 @@ class RetrofitFactory(
             .addInterceptor(responseLoggingInterceptor)
             .build()
         
-        // 创建 lenient 模式的 Gson，允许解析格式不严格的 JSON
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl(clobBaseUrl)
             .client(okHttpClient)
@@ -87,11 +82,6 @@ class RetrofitFactory(
             .addInterceptor(responseLoggingInterceptor)
             .build()
         
-        // 创建 lenient 模式的 Gson，允许解析格式不严格的 JSON
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl(clobBaseUrl)
             .client(okHttpClient)
@@ -129,11 +119,6 @@ class RetrofitFactory(
             .addInterceptor(urlReplaceInterceptor)
             .build()
         
-        // 创建 lenient 模式的 Gson
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl(fixedBaseUrl)
             .client(okHttpClient)
@@ -228,11 +213,6 @@ class RetrofitFactory(
         }
         val okHttpClient = createClient().build()
         
-        // 创建 lenient 模式的 Gson
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl("$baseUrl/")
             .client(okHttpClient)
@@ -253,11 +233,6 @@ class RetrofitFactory(
             .followSslRedirects(true)
             .build()
         
-        // 创建 lenient 模式的 Gson
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl("$baseUrl/")
             .client(okHttpClient)
@@ -292,10 +267,6 @@ class RetrofitFactory(
             .addInterceptor(builderAuthInterceptor)
             .build()
         
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl("$baseUrl/")
             .client(okHttpClient)
@@ -327,10 +298,6 @@ class RetrofitFactory(
             .addInterceptor(githubInterceptor)
             .build()
         
-        val gson = GsonBuilder()
-            .setLenient()
-            .create()
-        
         return Retrofit.Builder()
             .baseUrl("$baseUrl/")
             .client(okHttpClient)
@@ -393,18 +360,32 @@ class ResponseLoggingInterceptor : Interceptor {
                 val responseBody = response.peekBody(2048)
                 val responseBodyString = responseBody.string()
                 
-                // 检查是否是有效的 JSON
+                // 检查响应体是否为空
-                val isJson = responseBodyString.trim().startsWith("{") || 
+                val isEmpty = responseBodyString.isBlank()
-                            responseBodyString.trim().startsWith("[")
                 
-                if (!isJson || !response.isSuccessful) {
+                // 检查是否是有效的 JSON
+                val trimmedBody = responseBodyString.trim()
+                val isJson = !isEmpty && (
+                    trimmedBody.startsWith("{") || 
+                    trimmedBody.startsWith("[")
+                )
+                
+                // 如果响应体为空或不是 JSON，记录警告
+                if (isEmpty || !isJson) {
+                    val bodyPreview = if (isEmpty) {
+                        "(空响应体)"
+                    } else {
+                        trimmedBody.take(500)
+                    }
                     logger.warn(
                         "API 响应异常: method=${request.method}, url=${request.url}, " +
-                        "code=${response.code}, isJson=$isJson, " +
+                        "code=${response.code}, isJson=$isJson, isEmpty=$isEmpty, " +
-                        "responseBody=${responseBodyString.take(500)}"
+                        "responseBody=$bodyPreview"
                     )
                 }
             } catch (e: Exception) {
+                // 如果读取响应体失败，记录异常但不影响响应
+                logger.debug("读取响应体失败: ${e.message}")
             }
         }