SpringBoot入门三：列表分页

2023-11-07 17:56| 来源: 网络整理| 查看: 265

文章目录步骤简介：步骤一、普通的列表分页对列表数据展示的优化第一步：将列表包装在code、message中第二步：将列表的字段名称做修改和精简

SpringBoot实现列表数据分页系统环境：编辑器：Idea2018.1 操作系统：win7 maven：1.8.0_171

步骤简介：基本的列表分页对普通列表分页展示的优化步骤一、普通的列表分页

StudentService中添加分页方法

/** * 普通的列表分页 * @param page * @param pageSize * @return */ public Page pageRequest(int page, int pageSize){ //findAll中的page是从0开始计数的 return studentRepository.findAll(PageRequest.of(page -1 , pageSize)); }

StudentController中加上测试的调用方法

@RequestMapping(value = "/student/response", method = RequestMethod.GET) public Page page(@RequestParam int page, @RequestParam int pageSize){ return studentService.pageRequest(page, pageSize); }

此时若测试接口，可以看到SpringBoot默认的分页数据方式：

{ "content": [ { "id": 27, "name": "demo" }, { "id": 1, "name": "demo11" }, { "id": 2, "name": "lisi" }, { "id": 29, "name": "lisi" }, { "id": 32, "name": "lisi" }, { "id": 35, "name": "lisi" }, { "id": 38, "name": "lisi" }, { "id": 30, "name": "wangwu" }, { "id": 33, "name": "wangwu" }, { "id": 36, "name": "wangwu" } ], "pageable": { "sort": { "sorted": false, "unsorted": true, "empty": true }, "offset": 0, "pageSize": 10, "pageNumber": 0, "paged": true, "unpaged": false }, "totalPages": 2, "totalElements": 15, "last": false, "number": 0, "size": 10, "sort": { "sorted": false, "unsorted": true, "empty": true }, "numberOfElements": 10, "first": true, "empty": false } 对列表数据展示的优化

默认的列表展示样式不一定和项目中需要的分页样式相同，因此需要在此基础上做展示的优化，这里我分了两步，第一步，将列表包装在code、message中；第二步、将列表的字段名称做修改和精简

第一步：将列表包装在code、message中

entity中添加CommonResponseEntity类

package com.example.demo.entity; public class CommonResponseEntity { private final int status; private final String message; private T data; private static final int SUCCESS_STATUS = 200; private static final int DEFAULT_STATUS = SUCCESS_STATUS; private static final String DEFAULT_MESSAGE = "ok"; public CommonResponseEntity(int status, String message, T data) { this.status = status; this.message = message; this.data = data; } public CommonResponseEntity(int status, String message){ this.status = status; this.message = message; } public static CommonResponseEntity success(T data){ return new CommonResponseEntity(DEFAULT_STATUS, DEFAULT_MESSAGE, data); } public static CommonResponseEntity error(int status, String message){ return new CommonResponseEntity(status, message); } public int getStatus() { return status; } public String getMessage() { return message; } public T getData() { return data; } public void setData(T data) { this.data = data; } }

在StudentController中添加路由测试:

@RequestMapping(value = "/student/responsePage", method = RequestMethod.GET) public CommonResponseEntity responsePage(@RequestParam int page, @RequestParam int pageSize){ return CommonResponseEntity.success(studentService.pageRequest(page, pageSize)); }

若此时测试返回数据样式可以看到统一成了code、message包装后的样式：

{ "status": 200, "message": "ok", "data": { "content": [ { "id": 27, "name": "demo" }, { "id": 1, "name": "demo11" }, { "id": 2, "name": "lisi" }, { "id": 29, "name": "lisi" }, { "id": 32, "name": "lisi" }, { "id": 35, "name": "lisi" }, { "id": 38, "name": "lisi" }, { "id": 30, "name": "wangwu" }, { "id": 33, "name": "wangwu" }, { "id": 36, "name": "wangwu" } ], "pageable": { "sort": { "sorted": false, "unsorted": true, "empty": true }, "offset": 0, "pageSize": 10, "pageNumber": 0, "paged": true, "unpaged": false }, "totalPages": 2, "totalElements": 15, "last": false, "number": 0, "size": 10, "sort": { "sorted": false, "unsorted": true, "empty": true }, "numberOfElements": 10, "first": true, "empty": false } } 第二步：将列表的字段名称做修改和精简

以返回列表格式为page、pageSize、totalPage为例，需要在entity中添加PageResponse

package com.example.demo.entity; import org.springframework.data.domain.Page; import java.math.BigDecimal; import java.util.List; public class PageResponse { private final List list; private final int page; private final int pageSize; private final int totalPage; public PageResponse(List data, int pageSize, int page){ this.page = page; this.pageSize = pageSize; this.totalPage = (int)Math.ceil(BigDecimal.valueOf(data.size()).divide(BigDecimal.valueOf(pageSize)).doubleValue()); this.list = data.subList((page -1) * pageSize, Math.min(page * pageSize, data.size())); } public PageResponse(Page page){ this.list = page.getContent(); //page类的number是从0开始计数的 this.page = page.getNumber() + 1; this.pageSize = page.getSize(); this.totalPage = page.getTotalPages(); } public static PageResponse of(List data, int pageSize, int page){ return new PageResponse(data, pageSize, page); } public List getList() { return list; } public int getPage() { return page; } public int getPageSize() { return pageSize; } public int getTotalPage() { return totalPage; } }

然后在StudentController中添加测试方法：

@RequestMapping(value = "/student/responsePageResponse", method = RequestMethod.GET) public CommonResponseEntity responsePageResponse(@RequestParam int page, @RequestParam int pageSize){ return CommonResponseEntity.success(PageResponse.of(studentService.findAll(), pageSize, page)); }

最后,为了验证,可以测试下该路由,可以看到数据已经成为我们需要的样子:

{ "status": 200, "message": "ok", "data": { "list": [ { "id": 27, "name": "demo" }, { "id": 1, "name": "demo11" }, { "id": 2, "name": "lisi" }, { "id": 29, "name": "lisi" }, { "id": 32, "name": "lisi" }, { "id": 35, "name": "lisi" }, { "id": 38, "name": "lisi" }, { "id": 30, "name": "wangwu" }, { "id": 33, "name": "wangwu" }, { "id": 36, "name": "wangwu" } ], "page": 1, "pageSize": 10, "totalPage": 2 } }

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SpringBoot入门三：列表分页

SpringBoot入门三：列表分页

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