@RequestMapping("/findAll.do")     public ModelAndView findAll(@RequestParam(defaultValue = "1") int currentPage,String username,@RequestParam(defaultValue = "0")int type,HttpSession session){ 
                 //搜索时       /* if(username!=null && username!=""){ session.setAttribute("searchname",username); }else if(type==0) { username= (String) session.getAttribute("searchname"); }*/         if(type==1){ 
                     session.setAttribute("searchname",username);         }else { 
                     username= (String) session.getAttribute("searchname");         }           PageInfo<User> pageInfo = userService.findAll(currentPage,username);         ModelAndView modelAndView = new ModelAndView();         modelAndView.addObject("pageInfo", pageInfo);         modelAndView.setViewName("user-list");         return modelAndView;     } 

@Override     public PageInfo<User> findAll(int currentPage,String username) { 
        
        PageInfo<User> pageInfo=new PageInfo<>();
        pageInfo.setSize(5);

        int tc=userDao.getTotalCount(username);
        pageInfo.setTotalCount(tc);
        int tp=(int)Math.ceil(tc/5.0);
        pageInfo.setTotalPage(tp);
        if (currentPage<1){ 
        
            pageInfo.setCurrentPage(1);
        }else if (currentPage>tp){ 
        
            pageInfo.setCurrentPage(tp);
        }else { 
        
            pageInfo.setCurrentPage(currentPage);
        }
        int start=(pageInfo.getCurrentPage()-1)*5;
        List<User> userList=userDao.findAll(start,username);
        pageInfo.setList(userList);
        return pageInfo;
    }

  <select id="getTotalCount" resultType="int">
        select count(*) from tb_user
        <if test="username!=null and username!=''">
            WHERE username LIKE concat("%",#{ 
        username},"%")
        </if>
    </select>

function deleteAll() { 
        
				var checkedNum=$("input[name='ids']:checked").length;
				alert(checkedNum);
				if(checkedNum==0){ 
        
					alert("请至少选择一个进行删除！！！");
					return;
				}
				if(confirm("确认要删除这些用户吗？")){ 
        
					var userList=new Array();
					$("input[name='ids']:checked").each(
							function () { 
        
								userList.push($(this).val())
							}
					);
					alert(userList);
					$.ajax({ 
        
						type:"post",
						url: "${pageContext.request.contextPath}/user/deleteAll.do",
						data:{ 
        userList:userList.toString()},
						success:function () { 
        
							alert("删除成功");
							location.reload();

						},
						error:function () { 
        
							alert("删除失败");
						}
					});
				}

  @RequestMapping("deleteAll.do")
    public String deleteAll(String userList){ 
        
        String[] strs = userList.split(",");
        List<Integer> ids=new ArrayList<>();
        for(String s:strs){ 
        
            ids.add(Integer.parseInt(s));
        }
        userService.deleteAll(ids);

        return "redirect:findAll.do";
    }

 void deleteAll(@Param("ids") List<Integer> ids);

   <delete id="deleteAll" parameterType="list">
        delete from tb_user where id in
        <foreach collection="ids" item="id" open="(" close=")" separator=",">
            #{ 
        id}
        </foreach>
    </delete>