springside封装的page类(源码)

最新推荐文章于 2021-10-28 10:09:05 发布

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本文介绍了一个Java通用分页查询工具类的设计与实现，该工具类支持自定义每页大小、排序方式等参数，并提供了简洁易用的API来获取分页数据。通过这个工具类，可以方便地进行数据库查询并实现分页显示。

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package org.springside.modules.orm;
import java.util.Collections;
import java.util.List;
import org.apache.commons.lang.StringUtils;

public class Page<T> {
// 公共变量 //
public static final String ASC = "asc";
public static final String DESC = "desc";
//分页参数 //
protected int pageNo = 1;
protected int pageSize = 1;
protected String orderBy = null;
protected String order = null;
protected boolean autoCount = true;
//返回结果 //
protected List<T> result = Collections.emptyList();
protected long totalCount = -1;
// 构造函数 //
public Page() {
}
public Page(final int pageSize) {
setPageSize(pageSize);
}
public Page(final int pageSize, final boolean autoCount) {
setPageSize(pageSize);
setAutoCount(autoCount);
}
// 查询参数访问函数 //

public int getPageNo() {
return pageNo;
}

public void setPageNo(final int pageNo) {
this.pageNo = pageNo;
if (pageNo < 1) {
this.pageNo = 1;
}
}

public int getPageSize() {
return pageSize;
}

public void setPageSize(final int pageSize) {
this.pageSize = pageSize;
if (pageSize < 1) {
this.pageSize = 1;
}
}

public int getFirst() {
return ((pageNo - 1) * pageSize) + 1;
}

public String getOrderBy() {
return orderBy;
}

public void setOrderBy(final String orderBy) {
this.orderBy = orderBy;
}

public boolean isOrderBySetted() {
return (StringUtils.isNotBlank(orderBy) && StringUtils.isNotBlank(order));
}

public String getOrder() {
return order;
}

public void setOrder(final String order) {
//检查order字符串的合法值
String[] orders = StringUtils.split(StringUtils.lowerCase(order), ',');
for (String orderStr : orders) {
if (!StringUtils.equals(DESC, orderStr) && !StringUtils.equals(ASC, orderStr))
throw new IllegalArgumentException("排序方向" + orderStr + "不是合法值");
}
this.order = StringUtils.lowerCase(order);
}

public boolean isAutoCount() {
return autoCount;
}

public void setAutoCount(final boolean autoCount) {
this.autoCount = autoCount;
}
// 访问查询结果函数 //

public List<T> getResult() {
return result;
}
public void setResult(final List<T> result) {
this.result = result;
}

public long getTotalCount() {
return totalCount;
}
public void setTotalCount(final long totalCount) {
this.totalCount = totalCount;
}

public long getTotalPages() {
if (totalCount < 0)
return -1;
long count = totalCount / pageSize;
if (totalCount % pageSize > 0) {
count++;
}
return count;
}

public boolean isHasNext() {
return (pageNo + 1 <= getTotalPages());
}

public int getNextPage() {
if (isHasNext())
return pageNo + 1;
else
return pageNo;
}

public boolean isHasPre() {
return (pageNo - 1 >= 1);
}

public int getPrePage() {
if (isHasPre())
return pageNo - 1;
else
return pageNo;
}
}