在Spring Boot中使用Spring-data-jpa实现分页查询
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在我们平时的工作中，查询列表在我们的系统中基本随处可见，那么我们如何使用jpa进行多条件查询以及查询列表分页呢？下面我将介绍两种多条件查询方式。
1、引入起步依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId></dependency>
2、对thymeleaf和jpa进行配置
打开application.yml，添加以下参数，以下配置在之前的文章中介绍过，此处不做过多说明
spring: thymeleaf: cache: true check-template-location: true content-type: text/html enabled: true encoding: utf-8 mode: HTML5 prefix: classpath:/templates/ suffix: .html excluded-view-names: template-resolver-order: datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/restful?useUnicode=true&characterEncoding=UTF-8&useSSL=false username: root password: root initialize: true init-db: true jpa: database: mysql show-sql: true hibernate: ddl-auto: update naming: strategy: org.hibernate.cfg.ImprovedNamingStrategy
3、编写实体Bean
@Entity@Table(name="book")public class Book { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id", updatable = false) private Long id; @Column(nullable = false,name = "name") private String name; @Column(nullable = false,name = "isbn") private String isbn; @Column(nullable = false,name = "author") private String author; public Book (String name,String isbn,String author){ this.name = name; this.isbn = isbn; this.author = author; } public Book(){ } //此处省去get、set方法}public class BookQuery { private String name; private String isbn; private String author; //此处省去get、set方法}4、编写Repository接口
@Repository("bookRepository")public interface BookRepository extends JpaRepository<Book,Long> ,JpaSpecificationExecutor<Book> {}此处继承了两个接口，后续会介绍为何会继承这两个接口首先抽象出接口
public interface BookQueryService { Page<Book> findBookNoCriteria(Integer page,Integer size); Page<Book> findBookCriteria(Integer page,Integer size,BookQuery bookQuery);}实现接口@Service(value="https://my.oschina.net/wangxincj/blog/bookQueryService")public class BookQueryServiceImpl implements BookQueryService { @Resource BookRepository bookRepository; @Override public Page<Book> findBookNoCriteria(Integer page,Integer size) { Pageable pageable = new PageRequest(page, size, Sort.Direction.ASC, "id"); return bookRepository.findAll(pageable); } @Override public Page<Book> findBookCriteria(Integer page, Integer size, final BookQuery bookQuery) { Pageable pageable = new PageRequest(page, size, Sort.Direction.ASC, "id"); Page<Book> bookPage = bookRepository.findAll(new Specification<Book>(){ @Override public Predicate toPredicate(Root<Book> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) { List<Predicate> list = new ArrayList<Predicate>(); if(null!=bookQuery.getName()&&!"".equals(bookQuery.getName())){ list.add(criteriaBuilder.equal(root.get("name").as(String.class), bookQuery.getName())); } if(null!=bookQuery.getIsbn()&&!"".equals(bookQuery.getIsbn())){ list.add(criteriaBuilder.equal(root.get("isbn").as(String.class), bookQuery.getIsbn())); } if(null!=bookQuery.getAuthor()&&!"".equals(bookQuery.getAuthor())){ list.add(criteriaBuilder.equal(root.get("author").as(String.class), bookQuery.getAuthor())); } Predicate[] p = new Predicate[list.size()]; return criteriaBuilder.and(list.toArray(p)); } },pageable); return bookPage; }}此处我定义了两个接口，findBookNoCriteria是不带查询条件的，findBookCriteria是带查询条件的。在此处介绍一下上面提到的自定义Repository继承的两个接口，如果你的查询列表是没有查询条件，只是列表展示和分页，只需继承JpaRepository接口即可，但是如果你的查询列表是带有多个查询条件的话则需要继承JpaSpecificationExecutor接口，这个接口里面定义的多条件查询的方法。当然不管继承哪个接口，当你做分页查询时，都是需要调用findAll方法的，这个方法是jap定义好的分页查询方法。
findBookCriteria方法也可以使用以下方法实现，大家可以自行选择
@Override public Page<Book> findBookCriteria(Integer page, Integer size, final BookQuery bookQuery) { Pageable pageable = new PageRequest(page, size, Sort.Direction.ASC, "id"); Page<Book> bookPage = bookRepository.findAll(new Specification<Book>(){ @Override public Predicate toPredicate(Root<Book> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) { Predicate p1 = criteriaBuilder.equal(root.get("name").as(String.class), bookQuery.getName()); Predicate p2 = criteriaBuilder.equal(root.get("isbn").as(String.class), bookQuery.getIsbn()); Predicate p3 = criteriaBuilder.equal(root.get("author").as(String.class), bookQuery.getAuthor()); query.where(criteriaBuilder.and(p1,p2,p3)); return query.getRestriction(); } },pageable); return bookPage; }6、编写Controller
针对有查询条件和无查询条件，我们分别编写一个Controller，默认每页显示5条，如下
@Controller@RequestMapping(value = "https://my.oschina.net/queryBook")public class BookController { @Autowired BookQueryService bookQueryService; @RequestMapping("/findBookNoQuery") public String findBookNoQuery(ModelMap modelMap,@RequestParam(value = "https://my.oschina.net/wangxincj/blog/page", defaultValue = "https://my.oschina.net/wangxincj/blog/0") Integer page, @RequestParam(value = "https://my.oschina.net/wangxincj/blog/size", defaultValue = "https://my.oschina.net/wangxincj/blog/5") Integer size){ Page<Book> datas = bookQueryService.findBookNoCriteria(page, size); modelMap.addAttribute("datas", datas); return "index1"; } @RequestMapping(value = "https://my.oschina.net/findBookQuery",method = {RequestMethod.GET,RequestMethod.POST}) public String findBookQuery(ModelMap modelMap, @RequestParam(value = "https://my.oschina.net/wangxincj/blog/page", defaultValue = "https://my.oschina.net/wangxincj/blog/0") Integer page, @RequestParam(value = "https://my.oschina.net/wangxincj/blog/size", defaultValue = "https://my.oschina.net/wangxincj/blog/5") Integer size, BookQuery bookQuery){ Page<Book> datas = bookQueryService.findBookCriteria(page, size,bookQuery); modelMap.addAttribute("datas", datas); return "index2"; }}7、编写页面
首先我们编写一个通用的分页页面，新建一个叫page.html的页面
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout" layout:decorator="page"><body><div th:fragment="pager"> <div class="text-right" th:with="baseUrl=${#httpServletRequest.getRequestURL().toString()},pars=${#httpServletRequest.getQueryString() eq null ? '' : new String(#httpServletRequest.getQueryString().getBytes('iso8859-1'), 'UTF-8')}"> <ul style="margin:0px;" class="pagination" th:with="newPar=${new Java.lang.String(pars eq null ? '' : pars).replace('page='+(datas.number), '')}, curTmpUrl=${baseUrl+'?'+newPar}, curUrl=${curTmpUrl.endsWith('&') ? curTmpUrl.substring(0, curTmpUrl.length()-1):curTmpUrl}" > <!--<li th:text="${pars}"></li>--> <li><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=0)}">首页</a></li> <li th:if="${datas.hasPrevious()}"><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.number-1})}">上一页</a></li> <!--总页数小于等于10--> <div th:if="${(datas.totalPages le 10) and (datas.totalPages gt 0)}" th:remove="tag"> <div th:each="pg : ${#numbers.sequence(0, datas.totalPages - 1)}" th:remove="tag"> <span th:if="${pg eq datas.getNumber()}" th:remove="tag"> <li class="active"><span class="current_page line_height" th:text="${pg+1}">${pageNumber}</span></li> </span> <span th:unless="${pg eq datas.getNumber()}" th:remove="tag"> <li><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${pg})}" th:text="${pg+1}"></a></li> </span> </div> </div> <!-- 总数数大于10时 --> <div th:if="${datas.totalPages gt 10}" th:remove="tag"> <li th:if="${datas.number-2 ge 0}"><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.number}-2)}" th:text="${datas.number-1}"></a></li> <li th:if="${datas.number-1 ge 0}"><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.number}-1)}" th:text="${datas.number}"></a></li> <li class="active"><span class="current_page line_height" th:text="${datas.number+1}"></span></li> <li th:if="${datas.number+1 lt datas.totalPages}"><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.number}+1)}" th:text="${datas.number+2}"></a></li> <li th:if="${datas.number+2 lt datas.totalPages}"><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.number}+2)}" th:text="${datas.number+3}"></a></li> </div> <li th:if="${datas.hasNext()}"><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.number+1})}">下一页</a></li> <!--<li><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/@{${curUrl}(page=${datas.totalPages-1})}">尾页</a></li>--> <li><a href="https://my.oschina.net/wangxincj/blog/#" th:href="https://my.oschina.net/wangxincj/blog/${datas.totalPages le 0 ? curUrl+'page=0':curUrl+'&page='+(datas.totalPages-1)}">尾页</a></li> <li><span th:utext="'共'+${datas.totalPages}+'页 / '+${datas.totalElements}+' 条'"></span></li> </ul> </div></div></body></html>针对无查询条件的接口，创建一个名为index1.html的页面并引入之前写好的分页页面，如下<!DOCTYPE html><html lang="en" xmlns:th="http://www.w3.org/1999/xhtml"><head> <meta charset="UTF-8"/> <title>Title</title> <script type="text/javascript" th:src="https://my.oschina.net/wangxincj/blog/@{/jquery-1.12.3.min.js}"></script> <script type="text/javascript" th:src="https://my.oschina.net/wangxincj/blog/@{/bootstrap/js/bootstrap.min.js}"></script> <link type="text/css" rel="stylesheet" th:href="https://my.oschina.net/wangxincj/blog/@{/bootstrap/css/bootstrap-theme.min.css}"/> <link type="text/css" rel="stylesheet" th:href="https://my.oschina.net/wangxincj/blog/@{/bootstrap/css/bootstrap.css}"/></head><body> <table class="table table-hover"> <thead> <tr> <th>ID</th> <th>name</th> <th>isbn</th> <th>author</th> </tr> </thead> <tbody> <tr th:each="obj : ${datas}"> <td th:text="${obj.id}">${obj.id}</td> <td th:text="${obj.name}">${obj.name}</td> <td th:text="${obj.isbn}">${obj.isbn}</td> <td th:text="${obj.name}">${obj.author}</td> </tr> </tbody> </table> <div th:include="page :: pager" th:remove="tag"></div></body></html> 针对有查询条件的接口，创建一个名为index2.html的页面并引入之前写好的分页页面，如下<!DOCTYPE html><html lang="en" xmlns:th="http://www.w3.org/1999/xhtml"><head> <meta charset="UTF-8"/> <title>Title</title> <script type="text/javascript" th:src="https://my.oschina.net/wangxincj/blog/@{/jquery-1.12.3.min.js}"></script> <script type="text/javascript" th:src="https://my.oschina.net/wangxincj/blog/@{/bootstrap/js/bootstrap.min.js}"></script> <link type="text/css" rel="stylesheet" th:href="https://my.oschina.net/wangxincj/blog/@{/bootstrap/css/bootstrap-theme.min.css}"/> <link type="text/css" rel="stylesheet" th:href="https://my.oschina.net/wangxincj/blog/@{/bootstrap/css/bootstrap.css}"/></head><body><form th:action="@{/queryBook/findBookQuery}" th:object="${bookQuery}" th:method="get"> <div class="form-group"> <label class="col-sm-2 control-label" >name</label> <div class="col-sm-4"> <input type="text" class="form-control" id="name" placeholder="请输入名称" th:field="*{name}"/> </div> <label class="col-sm-2 control-label">isbn</label> <div class="col-sm-4"> <input type="text" class="form-control" id="isbn" placeholder="请输ISBN" th:field="*{isbn}"/> </div> </div> <div class="form-group"> <label class="col-sm-2 control-label" >author</label> <div class="col-sm-4"> <input type="text" class="form-control" id="author" placeholder="请输author" th:field="*{author}"/> </div> <div class="col-sm-4"> <button class="btn btn-default" type="submit" placeholder="查询">查询</button> </div> </div></form> <table class="table table-hover"> <thead> <tr> <th>ID</th> <th>name</th> <th>isbn</th> <th>author</th> </tr> </thead> <tbody> <tr th:each="obj : ${datas}"> <td th:text="${obj.id}">${obj.id}</td> <td th:text="${obj.name}">${obj.name}</td> <td th:text="${obj.isbn}">${obj.isbn}</td> <td th:text="${obj.name}">${obj.author}</td> </tr> </tbody> </table> <div th:include="page :: pager" th:remove="tag"></div></body></html>ok！代码都已经完成，我们将项目启动起来，看一下效果。大家可以往数据库中批量插入一些数据，访问http://localhost:8080/queryBook/findBookNoQuery，显示如下页面
访问http://localhost:8080/queryBook/findBookQuery，显示页面如下，可以输入查询条件进行带条件的分页查询：
ok！以上便是一个简单的jap分页查询功能的实现。
转自：http://www.07net01.com/2017/01/1772868.html
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