批量刪除的SQL：delete from user where uid in(主鍵列表); 
UserBiz： 
//批量刪除 
public boolean batchDelete(String[] uids); 
UserBizImpl：

public boolean batchDelete(String[] uids) {
        String sql = "delete from user where uid in(";
        for(String uid:uids){
            sql+=uid+",";
        }
        //去掉最後一個逗號，增加一個)
        sql = sql.substring(0, sql.length()-1);
        sql+=")";
        Object[] params={};//沒有引數
        return udao.update(sql, params);
    }
 

UserServlet：

        HttpServletResponse response) throws ServletException, IOException{
        //獲取批量編號（注意，複選框的name值為chk_uid）
        String[] uids = request.getParameterValues("chk_uid");
        boolean result = ubiz.batchDelete(uids);

        if(result == true){
            //批量成功
            request.setAttribute("msg", "操作成功");
        }else{
            request.setAttribute("msg", "操作失敗");
        }
        findAllUser(request,response);
    }
 

userlist.jsp 
全選操作

批量刪除按鈕 

表單增加onSubmit事件 

//全選或清空
  function setChecked(boxname) {
    var boxs =document.getElementsByName(boxname);
    var chkbox = document.getElementById("chkall");
    if(chkbox.checked == true){
        for( i=0 ; i<boxs.length ; i++) {
            boxs[i].checked = true;
        }
    }else{
        for( i=0 ; i<boxs.length ; i++) {
            boxs[i].checked = false;
        }
    }
}
 

轉自：https://blog.csdn.net/new_codeer/article/details/51713645