添加可自定义oauth2 redirectURI的方法

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/WxMpService.java

@@ -387,6 +387,18 @@ public interface WxMpService {
    */
   public String oauth2buildAuthorizationUrl(String scope, String state);
 
+  /**
+   * <pre>
+   * 构造oauth2授权的url连接
+   * 详情请见: http://mp.weixin.qq.com/wiki/index.php?title=网页授权获取用户基本信息
+   * </pre>
+   * @param redirectURI
+   *   用户授权完成后的重定向链接，无需urlencode, 方法内会进行encode
+   * @param scope
+   * @param state
+   * @return code
+   */
+  public String oauth2buildAuthorizationUrl(String redirectURI, String scope, String state);
   /**
    * <pre>
    * 用code换取oauth2的access token

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/WxMpServiceImpl.java

@@ -363,9 +363,14 @@ public class WxMpServiceImpl implements WxMpService {
 
   @Override
   public String oauth2buildAuthorizationUrl(String scope, String state) {
+    return this.oauth2buildAuthorizationUrl(wxMpConfigStorage.getOauth2redirectUri(), scope, state);
+  }
+
+  @Override
+  public String oauth2buildAuthorizationUrl(String redirectURI, String scope, String state) {
     String url = "https://open.weixin.qq.com/connect/oauth2/authorize?" ;
     url += "appid=" + wxMpConfigStorage.getAppId();
-    url += "&redirect_uri=" + URIUtil.encodeURIComponent(wxMpConfigStorage.getOauth2redirectUri());
+    url += "&redirect_uri=" + URIUtil.encodeURIComponent(redirectURI);
     url += "&response_type=code";
     url += "&scope=" + scope;
     if (state != null) {