一、在ssm项目中引入依赖，数据库版本是mysql 5.7
<!-- mabatis分页插件 -->
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.1.10</version>
</dependency>
二、在配置文件中声明
在这里我说明一下，可以单独写一个mybatis分页的配置文件，然后引入到spring.xml配置文件中去。但是也可以直接引用到spring.xml中。本文采用的是第二种方式。
<!-- 传入PageHelper的插件 -->
<property name="plugins">
<array>
<!-- 传入插件的对象 -->
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<props>
<prop key="helperDialect">mysql</prop>
<prop key="reasonable">true</prop>
</props>
</property>
</bean>
</array>
</property>
三、分页使用
- controller层接收前端传过来的页数和每页个数限制，传递给service层
2. service层代码不需要改动，在service的实现层需要做分页处理。
PageHelper.startPage(page, limit);//分页开始，注意这两行不能分开，需要紧挨着
List<StuErrti> list = stuErrtiDao.selectByExample(example);//查询内容
//分页的实现,这里的list就是上一句的list,需要保持一致
PageInfo<StuErrti> pageInfo = new PageInfo<StuErrti>(list);
四、效果演示
这里的总数是通过pageInfo.getTotal()获取到的
pageInfo.getTotal()
其实这个插件里面集成了实体类，不需要我们再写了
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package com.github.pagehelper;
import java.util.Collection;
import java.util.List;
public class PageInfo<T> extends PageSerializable<T> {
private int pageNum;
private int pageSize;
private int size;
private int startRow;
private int endRow;
private int pages;
private int prePage;
private int nextPage;
private boolean isFirstPage;
private boolean isLastPage;
private boolean hasPreviousPage;
private boolean hasNextPage;
private int navigatePages;
private int[] navigatepageNums;
private int navigateFirstPage;
private int navigateLastPage;
public PageInfo() {
this.isFirstPage = false;
this.isLastPage = false;
this.hasPreviousPage = false;
this.hasNextPage = false;
}
public PageInfo(List<T> list) {
this(list, 8);
}
public PageInfo(List<T> list, int navigatePages) {
super(list);
this.isFirstPage = false;
this.isLastPage = false;
this.hasPreviousPage = false;
this.hasNextPage = false;
if (list instanceof Page) {
Page page = (Page)list;
this.pageNum = page.getPageNum();
this.pageSize = page.getPageSize();
this.pages = page.getPages();
this.size = page.size();
if (this.size == 0) {
this.startRow = 0;
this.endRow = 0;
} else {
this.startRow = page.getStartRow() + 1;
this.endRow = this.startRow - 1 + this.size;
}
} else if (list instanceof Collection) {
this.pageNum = 1;
this.pageSize = list.size();
this.pages = this.pageSize > 0 ? 1 : 0;
this.size = list.size();
this.startRow = 0;
this.endRow = list.size() > 0 ? list.size() - 1 : 0;
}
if (list instanceof Collection) {
this.navigatePages = navigatePages;
this.calcNavigatepageNums();
this.calcPage();
this.judgePageBoudary();
}
}
public static <T> PageInfo<T> of(List<T> list) {
return new PageInfo(list);
}
public static <T> PageInfo<T> of(List<T> list, int navigatePages) {
return new PageInfo(list, navigatePages);
}
private void calcNavigatepageNums() {
int i;
if (this.pages <= this.navigatePages) {
this.navigatepageNums = new int[this.pages];
for(i = 0; i < this.pages; ++i) {
this.navigatepageNums[i] = i + 1;
}
} else {
this.navigatepageNums = new int[this.navigatePages];
i = this.pageNum - this.navigatePages / 2;
int endNum = this.pageNum + this.navigatePages / 2;
int i;
if (i < 1) {
i = 1;
for(i = 0; i < this.navigatePages; ++i) {
this.navigatepageNums[i] = i++;
}
} else if (endNum > this.pages) {
endNum = this.pages;
for(i = this.navigatePages - 1; i >= 0; --i) {
this.navigatepageNums[i] = endNum--;
}
} else {
for(i = 0; i < this.navigatePages; ++i) {
this.navigatepageNums[i] = i++;
}
}
}
}
private void calcPage() {
if (this.navigatepageNums != null && this.navigatepageNums.length > 0) {
this.navigateFirstPage = this.navigatepageNums[0];
this.navigateLastPage = this.navigatepageNums[this.navigatepageNums.length - 1];
if (this.pageNum > 1) {
this.prePage = this.pageNum - 1;
}
if (this.pageNum < this.pages) {
this.nextPage = this.pageNum + 1;
}
}
}
private void judgePageBoudary() {
this.isFirstPage = this.pageNum == 1;
this.isLastPage = this.pageNum == this.pages || this.pages == 0;
this.hasPreviousPage = this.pageNum > 1;
this.hasNextPage = this.pageNum < this.pages;
}
public int getPageNum() {
return this.pageNum;
}
public void setPageNum(int pageNum) {
this.pageNum = pageNum;
}
public int getPageSize() {
return this.pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getSize() {
return this.size;
}
public void setSize(int size) {
this.size = size;
}
public int getStartRow() {
return this.startRow;
}
public void setStartRow(int startRow) {
this.startRow = startRow;
}
public int getEndRow() {
return this.endRow;
}
public void setEndRow(int endRow) {
this.endRow = endRow;
}
public int getPages() {
return this.pages;
}
public void setPages(int pages) {
this.pages = pages;
}
public int getPrePage() {
return this.prePage;
}
public void setPrePage(int prePage) {
this.prePage = prePage;
}
public int getNextPage() {
return this.nextPage;
}
public void setNextPage(int nextPage) {
this.nextPage = nextPage;
}
public boolean isIsFirstPage() {
return this.isFirstPage;
}
public void setIsFirstPage(boolean isFirstPage) {
this.isFirstPage = isFirstPage;
}
public boolean isIsLastPage() {
return this.isLastPage;
}
public void setIsLastPage(boolean isLastPage) {
this.isLastPage = isLastPage;
}
public boolean isHasPreviousPage() {
return this.hasPreviousPage;
}
public void setHasPreviousPage(boolean hasPreviousPage) {
this.hasPreviousPage = hasPreviousPage;
}
public boolean isHasNextPage() {
return this.hasNextPage;
}
public void setHasNextPage(boolean hasNextPage) {
this.hasNextPage = hasNextPage;
}
public int getNavigatePages() {
return this.navigatePages;
}
public void setNavigatePages(int navigatePages) {
this.navigatePages = navigatePages;
}
public int[] getNavigatepageNums() {
return this.navigatepageNums;
}
public void setNavigatepageNums(int[] navigatepageNums) {
this.navigatepageNums = navigatepageNums;
}
public int getNavigateFirstPage() {
return this.navigateFirstPage;
}
public int getNavigateLastPage() {
return this.navigateLastPage;
}
public void setNavigateFirstPage(int navigateFirstPage) {
this.navigateFirstPage = navigateFirstPage;
}
public void setNavigateLastPage(int navigateLastPage) {
this.navigateLastPage = navigateLastPage;
}
public String toString() {
StringBuilder sb = new StringBuilder("PageInfo{");
sb.append("pageNum=").append(this.pageNum);
sb.append(", pageSize=").append(this.pageSize);
sb.append(", size=").append(this.size);
sb.append(", startRow=").append(this.startRow);
sb.append(", endRow=").append(this.endRow);
sb.append(", total=").append(this.total);
sb.append(", pages=").append(this.pages);
sb.append(", list=").append(this.list);
sb.append(", prePage=").append(this.prePage);
sb.append(", nextPage=").append(this.nextPage);
sb.append(", isFirstPage=").append(this.isFirstPage);
sb.append(", isLastPage=").append(this.isLastPage);
sb.append(", hasPreviousPage=").append(this.hasPreviousPage);
sb.append(", hasNextPage=").append(this.hasNextPage);
sb.append(", navigatePages=").append(this.navigatePages);
sb.append(", navigateFirstPage=").append(this.navigateFirstPage);
sb.append(", navigateLastPage=").append(this.navigateLastPage);
sb.append(", navigatepageNums=");
if (this.navigatepageNums == null) {
sb.append("null");
} else {
sb.append('[');
for(int i = 0; i < this.navigatepageNums.length; ++i) {
sb.append(i == 0 ? "" : ", ").append(this.navigatepageNums[i]);
}
sb.append(']');
}
sb.append('}');
return sb.toString();
}
}