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				@@ -187,7 +187,7 @@ public class ImGroupServiceImpl extends ServiceImpl<ImGroupDao, ImGroup> impleme 
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				             clientType = "TEACHER"; 
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				         } 
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				         if (StringUtils.isNotBlank(imConfig.getAppPrefix()) && !imUserId.startsWith(imConfig.getAppPrefix())) { 
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				-            imUserId = MessageFormat.format("{0}:{1}:{2}", imConfig.getAppPrefix(), userId, clientType); 
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				+            imUserId = MessageFormat.format("{0}_{1}_{2}", imConfig.getAppPrefix(), userId, clientType); 
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				         } 
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				         return imUserId; 
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				     } 
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				@@ -200,7 +200,7 @@ public class ImGroupServiceImpl extends ServiceImpl<ImGroupDao, ImGroup> impleme 
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				             clientType = "TEACHER"; 
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				         } 
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				         if (StringUtils.isNotBlank(imConfig.getAppPrefix()) && !imUserId.startsWith(imConfig.getAppPrefix())) { 
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				-            imUserId = MessageFormat.format("{0}:{1}:{2}", imConfig.getAppPrefix(), userId, clientType); 
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				+            imUserId = MessageFormat.format("{0}_{1}_{2}", imConfig.getAppPrefix(), userId, clientType); 
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				         } 
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				         return imUserId; 
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				     } 
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				@@ -215,7 +215,7 @@ public class ImGroupServiceImpl extends ServiceImpl<ImGroupDao, ImGroup> impleme 
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				     @Override 
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				     public String analysisImUserId(String imUserId) { 
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				         if (StringUtils.isNotBlank(imConfig.getAppPrefix())) { 
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				-            return imUserId.replace(imConfig.getAppPrefix() + ":", ""); 
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				+            return imUserId.replace(imConfig.getAppPrefix() + "_", ""); 
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				         } 
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				         return imUserId; 
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				     } 
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