PageHelper分页插件上的PageInfo使用
2024-05-16 12:12:58
依赖包
<dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><!--<version>1.3.0</version>--><version>1.2.13</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.11.0</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency>
工具类
创建ResultCode类
public enum ResultCode {// 自定义状态码SUCCESS(0, "操作成功！"),FAIL(-1,"操作失败！");private Integer code;private String message;ResultCode(Integer code, String message) {this.code = code;this.message = message;}public Integer code() {return this.code;}public String message() {return this.message;}public static String getMessage(String name) {for (ResultCode item : ResultCode.values()) {if (item.name().equals(name)) {return item.message;}}return name;}public static Integer getCode(String name) {for (ResultCode item : ResultCode.values()) {if (item.name().equals(name)) {return item.code;}}return null;} }创建ResultJson类
import cn.xm.entity.KanBan; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.annotation.JsonInclude.Include; import com.github.pagehelper.PageInfo; import lombok.Data;import java.io.Serializable; import java.util.ArrayList;//返回数据 @Data public class ResultJson<T> implements Serializable {private static final long serialVersionUID = 1L;private Integer error_code=0;private String message="操作成功！";private T data;//@JSONField(serialize = false)private T json;private T list;@JsonInclude(value= Include.NON_NULL)private T timelist;@JsonInclude(value= Include.NON_NULL)private Integer totalPage;@JsonInclude(value= Include.NON_NULL)private long total;@JsonInclude(value= Include.NON_NULL)private KanBan kb;public ResultJson() {}public ResultJson(Integer error_code, String message, T data) {super();this.error_code = error_code;this.message = message;this.data = data;}//返回成功 带datapublic static ResultJson suc(Object data){ResultJson j=new ResultJson();j.setData(data);return j;}//全部返回 oklist successpublic static ResultJson okList(Integer error_code, String message, Object list){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setList(list);return j;}//全部返回 okListPagepublic static ResultJson okListPage(Integer error_code, String message, Object list, Integer totalPage){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setList(list);j.setTotalPage(totalPage);return j;}//全部返回 okDataPagepublic static ResultJson okDataPage(Integer error_code, String message, Object data, Integer totalPage){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(data);j.setTotalPage(totalPage);return j;}//全部返回 okdatapublic static ResultJson okData(Integer error_code, String message, Object data){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(data);return j;}//全部返回 okJsonpublic static ResultJson okJson(Integer error_code, String message, Object json){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setJson(json);return j;}//全部返回 data jsonpublic static ResultJson okDataJson(Integer error_code, String message,Object data ,Object json){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(data);j.setJson(json);return j;}//不带数据返回 okpublic static ResultJson ok(Integer error_code, String message){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(new ArrayList());return j;}//不带数据返回 errorpublic static ResultJson error(Integer error_code, String message){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);//j.setData(new ArrayList());return j;}//默认 error错误返回public static ResultJson error(){ResultJson j=new ResultJson();j.setError_code(1);j.setMessage("操作失败！");return j;}//全部返回 okListPagepublic static ResultJson okDataList(Integer error_code, String message, Object list, Object data){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setList(list);j.setData(data);return j;}public ResultJson(Integer error_code) {this.error_code = error_code;}public ResultJson(Integer error_code, String message) {super();this.error_code = error_code;this.message = message;}public ResultJson(Integer error_code, T data) {super();this.error_code = error_code;this.data = data;}public static ResultJson HD_Charts(Integer error_code, String message, Object data,Object list){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(data);j.setList(list);return j;}public void Result() {}public void Result(Integer error_code, String message) {this.error_code = error_code;this.message = message;}public static cn.z_currency.bean.ResultJson success() {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setResultCode(ResultCode.SUCCESS);return result;}public static cn.z_currency.bean.ResultJson success(Object data) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setResultCode(ResultCode.SUCCESS);if (data instanceof PageInfo){result.setData(((PageInfo<?>) data).getList());result.setTotalPage(((PageInfo<?>) data).getPages());result.setTotal(((PageInfo<?>) data).getTotal());}else {result.setData(data);}return result;}public static cn.z_currency.bean.ResultJson success(Object data,Object list) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setList(list);result.setResultCode(ResultCode.SUCCESS);if (data instanceof PageInfo){result.setData(((PageInfo<?>) data).getList());result.setTotalPage(((PageInfo<?>) data).getPages());result.setTotal(((PageInfo<?>) data).getTotal());}else {result.setData(data);}return result;}public static ResultJson success(Integer error_code, String message,Object data ,Object json){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(data);j.setJson(json);return j;}public static ResultJson success(Integer error_code, String message){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);return j;}public static ResultJson success(Integer error_code, String message,Object data){ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);j.setData(data);return j;}public static cn.z_currency.bean.ResultJson fail() {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setResultCode(ResultCode.FAIL);return result;}public static cn.z_currency.bean.ResultJson fail(Integer error_code, String message) {ResultJson j=new ResultJson();j.setError_code(error_code);j.setMessage(message);return j;}public static cn.z_currency.bean.ResultJson fail(Object data) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setResultCode(ResultCode.FAIL);if (data instanceof PageInfo){result.setData(((PageInfo<?>) data).getList());result.setTotalPage(((PageInfo<?>) data).getPages());}else {result.setData(data);}return result;}public static cn.z_currency.bean.ResultJson failure(ResultCode resultCode) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setResultCode(resultCode);return result;}public static cn.z_currency.bean.ResultJson failure(ResultCode resultCode, Object data) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setResultCode(resultCode);result.setData(data);return result;}public static cn.z_currency.bean.ResultJson validateFailed(String str) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setMessage(str);return result;}public static cn.z_currency.bean.ResultJson validateFailed(String str, Exception e) {cn.z_currency.bean.ResultJson result = new cn.z_currency.bean.ResultJson();result.setMessage(str);return result;}public void setResultCode(ResultCode error_code) {this.error_code = error_code.code();this.message = error_code.message();}
PageInfo使用
实体
import lombok.Data;@Data @Table(name = "cw_refund")//表名 public class Refund {/**页码*/@Transientprivate int pageIndex;/**条数*/@Transientprivate int pageSize; }Constroller类
@RestController @RequestMapping("/refund") public class RefundController {/***列表*/@RequestMapping(value = "/List", method = RequestMethod.POST)public ResultJson selectAll(@RequestBody Refund refund) {PageInfo<Refund> list = refundService.selectAllRefund(refund);return ResultJson.success(list);} }Server类
import com.github.pagehelper.PageInfo;public interface RefundService {PageInfo<Refund> selectAllRefund(Refund refund);}Impl类
import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import java.util.List;@Service public class RefundServicelmpl implements RefundService {@Autowiredprivate RefundMapper refundMapper;@Overridepublic PageInfo<Refund> selectAllRefund(Refund refund) {//传页数，条数PageHelper.startPage(refund.getPageIndex(),refund.getPageSize());//下两行代码中间不允许存在其它代码List<Refund> list = refundMapper.selectAllRefund(refund);PageInfo<Refund> pageInfoList = new PageInfo<>(list);return pageInfoList;} }Mapper类
import java.util.List;@Repository public interface RefundMapper extends MyMapper<Refund> {List<Refund> selectAllRefund(Refund refund);}xml文件
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.cw.dao.RefundMapper"><!--mapper所在路径--> <!-- id：mapper里方法名，parameterType（传）：实体所在路径，resultType（返）：实体所在路径--> <select id="selectAllRefund" parameterType="cn.cw.entity.Refund" resultType="cn.cw.entity.Refund">select*from cw_refund</select></mapper>
PageInfo的属性
private int pageNum; //当前页private int pageSize; //每页的数量private int size; //当前页的数量//由于startRow和endRow不常用，这里说个具体的用法 //可以在页面中"显示startRow到endRow 共size条数据" //当前页面第一个元素在数据库中的行号 private int startRow;private int endRow; //当前页面最后一个元素在数据库中的行号private long total; //总记录数private int pages; //总页数private List<T> list; //结果集(每页显示的数据)private int firstPage; //第一页private int prePage; //前一页private boolean isFirstPage = false; //是否为第一页private boolean isLastPage = false; //是否为最后一页private boolean hasPreviousPage = false; //是否有前一页private boolean hasNextPage = false; //是否有下一页private int navigatePages; //导航页码数private int[] navigatepageNums; //所有导航页号
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