修复V3支付预支付参数packageValue字段与微信官方API不一致问题，添加@SerializedName("package")注解

Agent-Logs-Url: https://github.com/binarywang/WxJava/sessions/4f76043e-c058-4838-8d60-a43a1c878544

Co-authored-by: binarywang <1343140+binarywang@users.noreply.github.com>

Author: Copilot

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/TransactionsResult.java

@@ -65,6 +65,10 @@ public static class JsapiResult implements Serializable {
     private String appId;
     private String timeStamp;
     private String nonceStr;
+    /**
+     * 由于package为java保留关键字，因此改为packageValue，序列化时会自动转换为package字段名
+     */
+    @SerializedName("package")
     private String packageValue;
     private String signType;
     private String paySign;
@@ -80,6 +84,10 @@ public static class AppResult implements Serializable {
     private String appid;
     private String partnerid;
     private String prepayid;
+    /**
+     * 由于package为java保留关键字，因此改为packageValue，序列化时会自动转换为package字段名
+     */
+    @SerializedName("package")
     private String packageValue;
     private String noncestr;
     private String timestamp;

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/result/CombineTransactionsResult.java

@@ -73,6 +73,10 @@ public static class JsapiResult implements Serializable {
     private String appId;
     private String timeStamp;
     private String nonceStr;
+    /**
+     * 由于package为java保留关键字，因此改为packageValue，序列化时会自动转换为package字段名
+     */
+    @SerializedName("package")
     private String packageValue;
     private String signType;
     private String paySign;
@@ -89,6 +93,10 @@ public static class AppResult implements Serializable {
     private String appid;
     private String partnerid;
     private String prepayid;
+    /**
+     * 由于package为java保留关键字，因此改为packageValue，序列化时会自动转换为package字段名
+     */
+    @SerializedName("package")
     private String packageValue;
     private String noncestr;
     private String timestamp;

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/result/WxPayUnifiedOrderV3Result.java

@@ -78,6 +78,10 @@ public static class JsapiResult implements Serializable {
     private String appId;
     private String timeStamp;
     private String nonceStr;
+    /**
+     * 由于package为java保留关键字，因此改为packageValue，序列化时会自动转换为package字段名
+     */
+    @SerializedName("package")
     private String packageValue;
     private String signType;
     private String paySign;
@@ -108,6 +112,10 @@ public static class AppResult implements Serializable {
     private String appid;
     private String partnerId;
     private String prepayId;
+    /**
+     * 由于package为java保留关键字，因此改为packageValue，序列化时会自动转换为package字段名
+     */
+    @SerializedName("package")
     private String packageValue;
     private String noncestr;
     private String timestamp;

weixin-java-pay/src/test/java/com/github/binarywang/wxpay/bean/result/WxPayUnifiedOrderV3ResultTest.java

@@ -2,6 +2,8 @@
 
 import com.github.binarywang.wxpay.bean.result.enums.TradeTypeEnum;
 import com.github.binarywang.wxpay.v3.util.SignUtils;
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
@@ -200,8 +202,55 @@ public void testAppResultWithPrepayId() throws Exception {
   }
 
   /**
-   * 测试getJsapiPayInfo方法的空值验证
+   * 测试JsapiResult序列化为JSON时，packageValue字段名应为package（兼容微信官方API要求）
    */
+  @Test
+  public void testJsapiResultJsonSerializationPackageFieldName() throws Exception {
+    String testPrepayId = "wx201410272009395522657a690389285100";
+    String testAppId = "wx8888888888888888";
+    KeyPair keyPair = generateKeyPair();
+    PrivateKey privateKey = keyPair.getPrivate();
+
+    WxPayUnifiedOrderV3Result.JsapiResult jsapiResult =
+      WxPayUnifiedOrderV3Result.getJsapiPayInfo(testPrepayId, testAppId, privateKey);
+
+    // 验证Java字段名仍为packageValue
+    Assert.assertEquals(jsapiResult.getPackageValue(), "prepay_id=" + testPrepayId);
+
+    // 验证JSON序列化后字段名为package（微信官方要求）
+    Gson gson = new Gson();
+    JsonObject jsonObject = gson.toJsonTree(jsapiResult).getAsJsonObject();
+    Assert.assertTrue(jsonObject.has("package"), "JSON中应该包含package字段");
+    Assert.assertFalse(jsonObject.has("packageValue"), "JSON中不应该包含packageValue字段");
+    Assert.assertEquals(jsonObject.get("package").getAsString(), "prepay_id=" + testPrepayId);
+  }
+
+  /**
+   * 测试AppResult序列化为JSON时，packageValue字段名应为package（兼容微信官方API要求）
+   */
+  @Test
+  public void testAppResultJsonSerializationPackageFieldName() throws Exception {
+    String testPrepayId = "wx201410272009395522657a690389285100";
+    String testAppId = "wx8888888888888888";
+    String testMchId = "1900000109";
+    KeyPair keyPair = generateKeyPair();
+    PrivateKey privateKey = keyPair.getPrivate();
+
+    WxPayUnifiedOrderV3Result.AppResult appResult =
+      WxPayUnifiedOrderV3Result.getAppPayInfo(testPrepayId, testAppId, testMchId, privateKey);
+
+    // 验证Java字段名仍为packageValue
+    Assert.assertEquals(appResult.getPackageValue(), "Sign=WXPay");
+
+    // 验证JSON序列化后字段名为package（微信官方要求）
+    Gson gson = new Gson();
+    JsonObject jsonObject = gson.toJsonTree(appResult).getAsJsonObject();
+    Assert.assertTrue(jsonObject.has("package"), "JSON中应该包含package字段");
+    Assert.assertFalse(jsonObject.has("packageValue"), "JSON中不应该包含packageValue字段");
+    Assert.assertEquals(jsonObject.get("package").getAsString(), "Sign=WXPay");
+  }
+
+
   @Test(expectedExceptions = IllegalArgumentException.class, 
         expectedExceptionsMessageRegExp = "prepayId, appId 和 privateKey 不能为空")
   public void testGetJsapiPayInfoWithNullPrepayId() {