<INPUT type="hidden" name="all_selected">  
<INPUT type="hidden" name="now_selected">  
<INPUT type="hidden" name="no_selected">  

// 获取checkbox信息,选中,未选中,当前选中  
    function getCheckBoxInformation() {  
     var checkboxes = document.getElementsByName("checkbox");  
     var checkedStr = "";  
     var uncheckedStr = "";  
     var url = "";  
     for(var i = 0; i < checkboxes.length; i++) {  
       var checkbox = checkboxes[i];  
       if(checkbox.checked) {  
        checkedStr = checkedStr + "," + checkbox.value;  
      }else {  
        uncheckedStr = uncheckedStr + "," + checkbox.value;  
      }  
    }  
    document.form1.now_selected.value = checkedStr;  
    document.form1.no_selected.value = uncheckedStr;  
   }  
 // 页面onload的时候计算当前页被选中项,并在页面表示  
   function initPage() {  
     var all_selected = document.form1.all_selected.value;  
     if(all_selected != "" && all_selected!= null) {  
       var arrall_select = all_selected.split(",");  
       if(arrall_select.length > 0) {  
         for(var k = 0; k < arrall_select.length; k++) {  
            for(var i = 0; i < document.form1.checkbox.length; i++) {  
               if(document.form1.checkbox[i].value == arrall_select[k]) {  
               document.form1.checkbox[i].checked = true;   
             }   
           }  
         }   
       }   
     }  
    }  

public String doubleSpread(String all_select, String now_selected, String no_selected) { 
    //获取当前选中的项目加入al 
    List al = new ArrayList(); 
    if(all_select != "" && all_select != null) 
    { 
      String[] all_select_str = all_select.split(","); 
      for(int a=0;a<all_select_str.length;a++) 
      { 
        al.add(all_select_str[a]); 
      } 
    } 
    //将当前选中项目加入列表 
    if (now_selected != "" && now_selected != null) { 
      String[] all_now_select = now_selected.split(","); 
      for (int i = 1; i < all_now_select.length; i++) { 
        if (!al.contains(all_now_select[i])) { 
          al.add(all_now_select[i]); 
        } 
      } 
    } 
    //将当前未选中项目从列表中删除 
    if (no_selected != "" && no_selected != null) { 
      String[] all_now_no_select = no_selected.split(","); 
      for (int i = 1; i < all_now_no_select.length; i++) { 
        if (al.contains(all_now_no_select[i])) { 
          al.remove(all_now_no_select[i]); 
        } 
      } 
    } 
    all_select=al.toString().replaceAll(" +","");; 
    all_select=all_select.substring(1,all_select.length()-1)+","; 
    return all_select; 
  }