POM配置
有两种方式,我们这里只使用原生的PageHelper
导入Maven:
<dependency>
<groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.3</version> </dependency>
Java配置
在springboot的启动类(WarApplication.java)里面注入:
@Bean
PageHelper pageHelper(){
//分页插件
PageHelper pageHelper = new PageHelper();
Properties properties = new Properties(); properties.setProperty("reasonable", "true"); properties.setProperty("supportMethodsArguments", "true"); properties.setProperty("returnPageInfo", "check"); properties.setProperty("params", "count=countSql"); pageHelper.setProperties(properties); //添加插件 new SqlSessionFactoryBean().setPlugins(new Interceptor[]{pageHelper}); return pageHelper; }
注意:网上很多文章都不贴插件的注入,所以会失败
Controller分页写法
语句pageNum表示当前页,5表示当前页显示的个数为5个
当前页页设置了默认值为1
@Autowired
private BlogMapper blogMapper;
@ApiOperation(value = "拿到所有博客",notes = "") @GetMapping(value = "blogs") public R1 ajaxBlog(@RequestParam(value = "pageNum",defaultValue = "1")Integer pageNum){ PageHelper.startPage(pageNum,5); List<Blog> blogList = blogMapper.selectByExample(new BlogExample()); PageInfo<Blog> pageInfo = new PageInfo<Blog>(blogList); return R1.add("blog",pageInfo); }
POSTMAN显示结果
当我把页数设置为5的时候,插件会默认选择查询结果的最后一页:
以上便是PageHelper在SpringBoot上的应用;