java web（SSM架構）實現部落格的上一篇、下一篇功能__web

運用了mybatis
1、Service層

 public Blog getAfterBlog(Integer blogId) {        BlogExample blogExample = new BlogExample();        BlogExample.Criteria criteria = blogExample.createCriteria();        criteria.andBlogIdGreaterThan(blogId);        Blog blog = new Blog();        if(blogMapper.selectByExample(blogExample).size() > 0 ){            blog = blogMapper.selectByExample(blogExample).get(0);        }else{            blog.setTitle("這是最後一篇文章");            blog.setBlogId(blogId);        }        return blog;    }

2、Service層

@Override    public Blog getPreBlog(Integer blogId) {        BlogExample blogExample = new BlogExample();        BlogExample.Criteria criteria = blogExample.createCriteria();        criteria.andBlogIdLessThan(blogId);        Blog blog = new Blog();        if(blogMapper.selectByExample(blogExample).size() > 0 ){            blog = blogMapper.selectByExample(blogExample).get(0);        }else{            blog.setTitle("這是第一篇文章");            blog.setBlogId(blogId);        }        return blog;    }

3、Controller層

@RequestMapping(value="/view")    public ModelAndView viewBlog(@RequestParam("blogId") Integer blogId){//        log.debug("In viewBlog, blogID={}", blogId);        Blog blog = blogServiceImpl.getBlogById(blogId);        Blog blogPre = blogServiceImpl.getPreBlog(blogId);        Blog blogAfter = blogServiceImpl.getAfterBlog(blogId);        ModelAndView mav = new ModelAndView("blog_view");        mav.addObject("blog",blog);        mav.addObject("blogPre",blogPre);        mav.addObject("blogAfter",blogAfter);        return mav;    }

4、前端

<div class="last-next">            <div>                <a href="${pageContext.request.contextPath}/blog/view?blogId=${blogPre.blogId}" title="上一篇">                    <i class="icon-double-angle-left"></i>${blogPre.title}                </a>            </div>            <div>                <a href="${pageContext.request.contextPath}/blog/view?blogId=${blogAfter.blogId}" title="下一篇">                    <i class="icon-double-angle-right"></i>${blogAfter.title}                </a>            </div>        </div>