Cannot forward after response has been committed異常處理
當進行驗證碼判斷時候，用轉發重新回到登錄界面並在request域對象中放入錯誤信息提示，在頁面中顯示錯誤信息，這個時候在轉發之後一定要加return，否則就會報Cannot forward after response has been committed異常，500錯誤 //判斷
if(null!=checkImg && null!=checkcode_session) {
if(!c
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- 1. Cannot forward after response has been committed
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