动态分页

package com.itsv.gbp.core.util;

import java.util.ArrayList;
import java.util.List;

public class Page<T> {

private int totalNums;
private int pageSize;
private int pageNum;
private List<T> result;

public Page(int pageSize, int totalNums, int pageNum) {
setPageSize(pageSize);
setTotalNums(totalNums);
setPageNum(pageNum);
}

public Page(int totalNums, int pageNum) {
this(2, totalNums, pageNum);
}

public int getTotalNums() {
return totalNums;
}

public void setTotalNums(int totalNums) {
this.totalNums = totalNums;
}

public int getPageSize() {
return pageSize;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

public int getTotalPages() {
int total = this.totalNums / this.pageSize;
if (this.totalNums % this.pageSize != 0) {
total += 1;
}

return total;
}

public int getStartNum() {
int num = (this.pageNum - 1) * this.pageSize + 1;
return num;
}

public int getEndNum() {
int num = this.getStartNum() + this.getPageSize();
return num;
}
public int getStartNumByList() {
int num = (this.pageNum - 1) * this.pageSize;
return num;
}
public int getEndNumByList() {
int num = this.getStartNumByList() + this.getPageSize() - 1;
if(num>this.totalNums){
num = this.totalNums-1;
}
return num;
}
public int getPageNum() {
return pageNum;
}

public void setPageNum(int pageNum) {
if (pageNum < 1) {
pageNum = 1;
} else if (pageNum > getTotalPages()) {
pageNum = getTotalPages();
}
this.pageNum = pageNum;
}

public List<T> getResult() {
return result;
}

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

public List<Integer> getSlider() {
int count = 5;
int halfSize = count / 2;
int totalPage = getTotalPages();
int startPageNo = Math.max(this.pageNum - halfSize, 1);
int endPageNo = Math.min(startPageNo + count - 1, totalPage);
if (endPageNo - startPageNo < count) {
startPageNo = Math.max(endPageNo - count + 1, 1);
}
List<Integer> result = new ArrayList<Integer>();
for (int i = startPageNo; i <= endPageNo; i++) {
result.add(i);
}
return result;
}

}