java实现简单的分页管理和拦截器

Pageinfo类

public class PageInfo { private List list; private int totalPage; private int size; private int totalCount; private int currentPage;

public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list; } public int getTotalPage() { return totalPage; } public void setTotalPage(int totalPage) { this.totalPage = totalPage; } public int getSize() { return size; } public void setSize(int size) { this.size = size; } public int getTotalCount() { return totalCount; } public void setTotalCount(int totalCount) { this.totalCount = totalCount; } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } @Override public String toString() { return "PageInfo{" + "list=" + list + ", totalPage=" + totalPage + ", size=" + size + ", totalCount=" + totalCount + ", currentPage=" + currentPage + '}'; }

}

Usercontroller

@RequestMapping("/findAll.do") public ModelAndView findAll(@RequestParam(defaultValue = “1”) int currentPage){ PageInfo pageInfo=userService.findAll(currentPage); ModelAndView modelAndView=new ModelAndView(); modelAndView.addObject(“pageInfo”,pageInfo); modelAndView.setViewName(“user-list”); return modelAndView;

UserService

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

int tc = userDao.getTotalCount(); 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); pageInfo.setList(userList); return pageInfo; }

UserMapple.xml

select * from tb_user limit #{start},5 select count(*) from tb_user

web.xml

LoginFiler com.zhongruan.filter.LoginFilter LoginFiler *.do

LoginFilter

public class LoginFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException {

} @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request= (HttpServletRequest) servletRequest; HttpServletResponse response= (HttpServletResponse) servletResponse; HttpSession session = request.getSession(); session.getAttribute("user"); User user= (User) session.getAttribute("user"); String uri=request.getRequestURI(); if(user==null && uri.indexOf("login.do")==-1){ response.sendRedirect(request.getContextPath()+"../login.jsp"); }else{ filterChain.doFilter(request,response); } } @Override public void destroy() { }

}