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          jxl.write.WritableImage  f  =  new  jxl.write.WritableImage(1,2,2,2,file); 
          ws.addImage(f); 
          //дÈëExel¹¤×÷±í 
          wwb.write(); 
          //¹Ø±ÕExcel¹¤×÷±¡¶ÔÏó 
          wwb.close();

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