报错返回语言适配

src/main/java/com/aida/seller/common/exception/BusinessException.java

@@ -1,9 +1,17 @@
 package com.aida.seller.common.exception;
 
+import com.aida.seller.common.context.UserContext;
+import com.aida.seller.model.vo.AuthPrincipalVo;
 import com.aida.seller.common.result.ResultEnum;
 import lombok.Data;
 import lombok.extern.slf4j.Slf4j;
 
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+
 /**
  * @author: dwjian
  * @description: 业务异常
@@ -12,31 +20,64 @@ import lombok.extern.slf4j.Slf4j;
 @Slf4j
 public class BusinessException extends RuntimeException {
 
+    private static final long serialVersionUID = 1L;
+
     private Integer code;
     private String msg;
 
     public BusinessException(ResultEnum resultEnum) {
         this.code = resultEnum.getCode();
-        this.msg = resultEnum.getMsg();
+        this.msg = getMessageFromResource(resultEnum.getMsg(), getUserLocale());
     }
 
     public BusinessException(String msg) {
         this.code = ResultEnum.FAIL.getCode();
-        this.msg = msg;
+        this.msg = getMessageFromResource(msg, getUserLocale());
     }
 
     public BusinessException(String msg, Integer code) {
         this.code = code;
-        this.msg = msg;
+        this.msg = getMessageFromResource(msg, getUserLocale());
     }
 
     public BusinessException(Throwable cause) {
         this.code = ResultEnum.FAIL.getCode();
-        this.msg = cause.getMessage();
+        this.msg = getMessageFromResource(cause.getMessage(), getUserLocale());
     }
 
     public BusinessException(ResultEnum resultEnum, String customMsg) {
         this.code = resultEnum.getCode();
-        this.msg = customMsg;
+        this.msg = getMessageFromResource(customMsg, getUserLocale());
+    }
+
+    private static String getUserLocale() {
+        try {
+            AuthPrincipalVo userInfo = UserContext.getUserHolder();
+            if (userInfo == null) return "en";
+            String lang = userInfo.getLanguage();
+            if (lang == null) return "en";
+            if ("CHINESE_SIMPLIFIED".equalsIgnoreCase(lang)) return "zh";
+            if ("ENGLISH".equalsIgnoreCase(lang)) return "en";
+            return "en";
+        } catch (Exception e) {
+            return "en";
+        }
+    }
+
+    public static String getMessageFromResource(String msg, String locale) {
+        if (msg == null) return null;
+        try (InputStream is = BusinessException.class.getClassLoader()
+                .getResourceAsStream("messages_" + locale + ".properties")) {
+            if (is != null) {
+                ResourceBundle bundle = new PropertyResourceBundle(
+                        new InputStreamReader(is, StandardCharsets.UTF_8));
+                if (bundle.containsKey(msg)) {
+                    return bundle.getString(msg);
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Failed to load messages_{}.properties: {}", locale, e.getMessage());
+        }
+        return msg;
     }
 }