import java.util.ArrayList;
import java.util.List;
/**
*
* @author cheney
*
* @date Aug 31, 2012
*/
public class PageModel<T> {
private int page = 1; // 当前页
public int totalPages = 0; // 总页数
private int pageRecorders;// 每页5条数据
private int totalRows = 0; // 总数据数
private int pageStartRow = 0;// 每页的起始数
private int pageEndRow = 0; // 每页显示数据的终止数
private boolean hasNextPage = false; // 是否有下一页
private boolean hasPreviousPage = false; // 是否有前一页
private List<T> list;
/**
*
* @param list
* @param pageRecorders
*/
public PageModel(List<T> list, int pageRecorders) {
init(list, pageRecorders);// 通过对象集，记录总数划分
}
/** */
/**
* 初始化list，并告之该list每页的记录数
*
* @param list
* @param pageRecorders
*/
public void init(List<T> list, int pageRecorders) {
this.pageRecorders = pageRecorders;
this.list = list;
totalRows = list.size();
hasPreviousPage = false;
if ((totalRows % pageRecorders) == 0) {
totalPages = totalRows / pageRecorders;
} else {
totalPages = totalRows / pageRecorders + 1;
}
if (page >= totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
if (totalRows < pageRecorders) {
this.pageStartRow = 0;
this.pageEndRow = totalRows;
} else {
this.pageStartRow = 0;
this.pageEndRow = pageRecorders;
}
}
public String displayForPage(String method) {
StringBuffer sb = new StringBuffer();
sb.append("<div class=\"w-page\"><label class=\"fr\">");
// 判断是否有上一页
if (this.isHasPreviousPage()) {
sb.append("<a href=\"javascript:void(0)\" onclick=\"" + method
+ "('" + String.valueOf(this.getPage() - 1)
+ "');return false;\">上一页</a>");
} else {
sb.append("<span class=\"disabled\">上一页</span>");
}
// 中间显示
for (int i = 1; i <= this.getTotalPages(); i++) {
String spanClzz = "<a href=\"javascript:void(0)\" onclick=\""
+ method + "('" + String.valueOf(i) + "');return false;\">"
+ i + "</a>";
if (this.page == i) {
spanClzz = "<span class='current'>" + i + "</span>";
}
sb.append(spanClzz);
// 当大于9页数的时候才进行分页显示
if (this.getTotalPages() - 2 > 7) {
if (i == 5) {
i = this.getTotalPages() - 2;
sb.append("...");
}
}
}
// 判断是否有下一页
if (this.isHasNextPage()) {
sb.append("<a href=\"javascript:void(0)\" onclick=\"" + method
+ "('" + String.valueOf(this.getPage() + 1)
+ "');return false;\">下一页</a>");
} else {
sb.append("<span class=\"disabled\">下一页</span>");
}
sb.append("</div>");
return sb.toString();
}
public String displayForPage() {
StringBuffer sb = new StringBuffer();
sb.append("<div class=\"w-page\"><label class=\"fr\">");
// 判断是否有上一页
if (this.isHasPreviousPage()) {
sb
.append("<a href=\"javascript:void(0)\" onclick=\"findDistResult('"
+ String.valueOf(this.getPage() - 1)
+ "');return false;\">上一页</a>");
} else {
sb.append("<span class=\"disabled\">上一页</span>");
}
// 中间显示
for (int i = 1; i <= this.getTotalPages(); i++) {
String spanClzz = "<a href=\"javascript:void(0)\" onclick=\"findDistResult('"
+ String.valueOf(i) + "');return false;\">" + i + "</a>";
if (this.page == i) {
spanClzz = "<span class='current'>" + i + "</span>";
}
sb.append(spanClzz);
// 当大于9页数的时候才进行分页显示
if (this.getTotalPages() - 2 > 7) {
if (i == 5) {
i = this.getTotalPages() - 2;
sb.append("...");
}
}
}
// 判断是否有下一页
if (this.isHasNextPage()) {
sb
.append("<a href=\"javascript:void(0)\" onclick=\"findDistResult('"
+ String.valueOf(this.getPage() + 1)
+ "');return false;\">下一页</a>");
} else {
sb.append("<span class=\"disabled\">下一页</span>");
}
sb.append("</div>");
return sb.toString();
}
// 判断要不要分页
public boolean isNext() {
return list.size() > 5;
}
public void setHasPreviousPage(boolean hasPreviousPage) {
this.hasPreviousPage = hasPreviousPage;
}
/**
*
* @return
*/
public List<T> getNextPage() {
page = page + 1;
disposePage();
return getObjects(page);
}
/**
* 处理分页
*/
private void disposePage() {
if (page == 0) {
page = 1;
}
if ((page - 1) > 0) {
hasPreviousPage = true;
} else {
hasPreviousPage = false;
}
if (page >= totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
}
/**
* 上一页
*
* @return
*/
public List<T> getPreviousPage() {
page = page - 1;
if ((page - 1) > 0) {
hasPreviousPage = true;
} else {
hasPreviousPage = false;
}
if (page >= totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
return getObjects(page);
}
/**
* 获取第几页的内容
*
* @param page
* @return
*/
public List<T> getObjects(int page) {
if (page == 0) {
this.setPage(1);
page = 1;
} else {
this.setPage(page);
}
this.disposePage();
if (page * pageRecorders < totalRows) {// 判断是否为最后一页
pageEndRow = page * pageRecorders;
pageStartRow = pageEndRow - pageRecorders;
} else {
pageEndRow = totalRows;
pageStartRow = pageRecorders * (totalPages - 1);
}
List<T> objects = null;
if (!list.isEmpty()) {
objects = list.subList(pageStartRow, pageEndRow);
}
return objects;
}
/**
* 第一页
*
* @return
*/
public List<T> getFistPage() {
if (this.isNext()) {
return list.subList(0, pageRecorders);
} else {
return list;
}
}
/**
* @return the page
*/
public int getPage() {
return page;
}
/**
* @param page
* the page to set
*/
public void setPage(int page) {
this.page = page;
}
/**
* @return the totalPages
*/
public int getTotalPages() {
return totalPages;
}
/**
* @param totalPages
* the totalPages to set
*/
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
/**
* @return the pageRecorders
*/
public int getPageRecorders() {
return pageRecorders;
}
/**
* @param pageRecorders
* the pageRecorders to set
*/
public void setPageRecorders(int pageRecorders) {
this.pageRecorders = pageRecorders;
}
/**
* @return the totalRows
*/
public int getTotalRows() {
return totalRows;
}
/**
* @param totalRows
* the totalRows to set
*/
public void setTotalRows(int totalRows) {
this.totalRows = totalRows;
}
/**
* @return the pageStartRow
*/
public int getPageStartRow() {
return pageStartRow;
}
/**
* @param pageStartRow
* the pageStartRow to set
*/
public void setPageStartRow(int pageStartRow) {
this.pageStartRow = pageStartRow;
}
/**
* @return the pageEndRow
*/
public int getPageEndRow() {
return pageEndRow;
}
/**
* @param pageEndRow
* the pageEndRow to set
*/
public void setPageEndRow(int pageEndRow) {
this.pageEndRow = pageEndRow;
}
/**
* @return the hasNextPage
*/
public boolean isHasNextPage() {
return hasNextPage;
}
/**
* @param hasNextPage
* the hasNextPage to set
*/
public void setHasNextPage(boolean hasNextPage) {
this.hasNextPage = hasNextPage;
}
/**
* @return the list
*/
public List<T> getList() {
return list;
}
/**
* @param list
* the list to set
*/
public void setList(List<T> list) {
this.list = list;
}
/**
* @return the hasPreviousPage
*/
public boolean isHasPreviousPage() {
return hasPreviousPage;
}
/*
*
* @param args
*/
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("a");
list.add("b");
list.add("c");
list.add("d");
list.add("e");
list.add("f");
list.add("g");
list.add("h");
list.add("h");
list.add("i");
list.add("j");
System.out.println(list.size());
PageModel<String> pm = new PageModel<String>(list, 3);// 每页显示条数
pm.getObjects(1);
System.out.println(pm.displayForPage("disResult"));
}
}
