java web 通用的分页组件

package commons.page;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.util.Map.Entry;

public class HtmlElement {

private String tagName;

private Map<String, String> attributes = new HashMap<String, String>();

private List<HtmlElement> children = new ArrayList<HtmlElement>();

private String value = "";

private String text = "";

public HtmlElement(String tagName) {

this.tagName = tagName;

}

public void setValue(String value) {

this.value = value;

}

public List<HtmlElement> getChildren() {

return children;

}

public void addChild(HtmlElement element) {

this.children.add(element);

}

public void addAttribute(String name, String value) {

this.attributes.put(name, value);

}

public String getAttributeValue(String name) {

return this.attributes.get(name);

}

@Override

public String toString() {

return this.toHtml();

}

public String toHtml() {

StringBuffer sb = new StringBuffer();

sb.append("<");

sb.append(this.tagName);

sb.append(this.getAttr());

sb.append(">");

sb.append(this.value);

for (HtmlElement e : this.children) {

sb.append(e.toHtml());

}

sb.append(this.text);

sb.append("</");

sb.append(this.tagName);

sb.append(">");

return sb.toString();

}

protected String getAttr() {

StringBuffer sb = new StringBuffer();

Set<Entry<String, String>> attr = this.attributes.entrySet();

for (Entry<String, String> entry : attr) {

sb.append(" ");

sb.append(entry.getKey());

sb.append("=/"");

sb.append(entry.getValue());

sb.append("/"");

}

return sb.toString();

}

public void setText(String text) {

this.text = text;

}

}

HtmlElement div1 = new HtmlElement("div");

HtmlElement div2 = new HtmlElement("div");

HtmlElement span = new HtmlElement("span");

div1.addAttribute("class", "tuo");

div1.addAttribute("id", "dd1");

div1.addChild(div2);

div1.addChild(span);

div1.setValue("fds222222fds");

div1.setText("wwwwwwwww");

System.out.println(div1.toHtml());

package commons.page;

import java.util.Calendar;

import java.util.List;

import commons.page.model.ArrayDataModel;

import commons.page.model.DataModel;

import commons.page.model.ListDataModel;

public class HtmlTable extends HtmlElement {

private HtmlElement thead = new HtmlElement("thead");

private HtmlElement tbody = new HtmlElement("tbody");

private HtmlElement tfoot = new HtmlElement("tfoot");

private String[] header = null;

private String[] footer = null;

private DataModel dataModel = null;

private int startRowIndex = -1;// 开始行索引

private int maxRowNum = -1;// 最大行数

private CellCallBack callBack;

public HtmlTable() {

super("table");

}

public void setCellCallBack(CellCallBack callBack) {

this.callBack = callBack;

}

public void setMaxRowNum(int maxRowNum) {

this.maxRowNum = maxRowNum;

}

public void setStartRowIndex(int startRowIndex) {

this.startRowIndex = startRowIndex;

}

public void setHeader(String[] header) {

this.header = header;

}

public void setHeader(String header) {

this.header = header.split(",");

}

public void setFooter(String[] footer) {

this.footer = footer;

}

public void setFooter(String footer) {

this.footer = footer.split(",");

}

public void setDataModel(DataModel dataModel) {

this.dataModel = dataModel;

}

public void setData(Object[][] data) {

this.dataModel = new ArrayDataModel();

this.dataModel.setWrappedData(data);

}

public void setData(List data) {

this.dataModel = new ListDataModel();

this.dataModel.setWrappedData(data);

}

public void setTbody(HtmlElement tbody) {

this.tbody = tbody;

}

public void setTfoot(HtmlElement tfoot) {

this.tfoot = tfoot;

}

public void setThead(HtmlElement thead) {

this.thead = thead;

}

@Override

public String toHtml() {

String id = this.getAttributeValue("id");

if (id == null || "".equals(id)) {

this.addAttribute("id", "table" + Calendar.getInstance().getTimeInMillis());

}

this.process();

return super.toHtml();

}

private void process() {

if (this.header != null) {

this.thead.getChildren().clear();

HtmlElement tr = new HtmlElement("tr");

for (String header : this.header) {

HtmlElement th = new HtmlElement("th");

th.setText(header);

tr.addChild(th);

}

this.thead.addChild(tr);

this.addChild(this.thead);

}

if (this.dataModel != null) {

if (this.callBack == null) {

this.callBack = new CellCallBack() {

public HtmlElement doCell(Object data) {

HtmlRow tr = new HtmlRow();

if (data instanceof String[]) {

String[] ds = (String[]) data;

int len = ds.length;

if (header != null) {

if (len > header.length) {

len = header.length;

}

}

for (int i = 0; i < len; i++) {

HtmlElement td = new HtmlElement("td");

td.setText(ds[i] == null ? "" : ds[i]);

tr.addChild(td);

}

} else if (data instanceof Object[]) {

Object[] os = (Object[]) data;

int len = os.length;

if (header != null) {

if (len > header.length) {

len = header.length;

}

}

for (int i = 0; i < len; i++) {

HtmlElement td = new HtmlElement("td");

td.setText(os[i] == null ? "" : os[i].toString());

tr.addChild(td);

}

}

return tr;

}

};

}

int startRow = 0;

int endRow = 0;

int j = this.dataModel.getRowCount();

if (this.startRowIndex > 0) {

startRow = this.startRowIndex;

}

if (this.maxRowNum < 0) {

endRow = this.dataModel.getRowCount();

} else {

endRow = startRow + this.maxRowNum;

}

if (endRow > j) {

endRow = j;

}

this.tbody.getChildren().clear();

for (int i = startRow; i < endRow; i++) {

this.dataModel.setRowIndex(i);

HtmlElement tr = this.callBack.doCell(this.dataModel.getRowData());

this.tbody.addChild(tr);

}

if (endRow - startRow < this.maxRowNum) {

for (int i = 0; i < (this.maxRowNum - (endRow - startRow)); i++) {

HtmlElement row = TableUtil.createRow(new String[this.header.length]);

this.tbody.addChild(row);

}

}

this.addChild(this.tbody);

}

if (this.footer != null) {

this.tfoot.getChildren().clear();

HtmlElement tr = new HtmlElement("tr");

for (String footer : this.footer) {

HtmlElement td = new HtmlElement("td");

td.setText(footer);

tr.addChild(td);

}

this.tfoot.addChild(tr);

this.addChild(this.tfoot);

}

}

}

package commons.page.model;

import java.util.ArrayList;

import java.util.List;

public abstract class DataModel {

private List _listeners;

public void addDataModelListener(DataModelListener listener) {

if (listener == null)

throw new NullPointerException("listener");

if (_listeners == null) {

_listeners = new ArrayList();

}

_listeners.add(listener);

}

public DataModelListener[] getDataModelListeners() {

if (_listeners == null) {

return new DataModelListener[0];

}

return (DataModelListener[]) _listeners.toArray(new DataModelListener[_listeners.size()]);

}

abstract public int getRowCount();

abstract public Object getRowData();

abstract public int getRowIndex();

abstract public Object getWrappedData();

abstract public boolean isRowAvailable();

public void removeDataModelListener(DataModelListener listener) {

if (listener == null)

throw new NullPointerException("listener");

if (_listeners != null) {

_listeners.remove(listener);

}

}

abstract public void setRowIndex(int rowIndex);

abstract public void setWrappedData(Object data);

}

package commons.page;

import java.math.*;

/**

* 分页操作类,该类来自于互联网,做了部分修改,以适应需求

*

* @author life

*

*/

public class Pager {

private int totalRows; // 总行数

private int pageSize = 13; // 每页显示的行数

private int currentPage; // 当前页号

private int totalPages; // 总页数

private int startRow; // 当前页在数据库中的起始行

public Pager() {

currentPage = 1;

startRow = 0;

}

private void process() {

totalPages = totalRows / pageSize;

int mod = totalRows % pageSize;

if (mod > 0) {

totalPages++;

}

if (this.currentPage <= 0) {

currentPage = 1;

}

startRow = (currentPage - 1) * pageSize;

}

public int getStartRow() {

return startRow;

}

public int getTotalPages() {

return totalPages;

}

public int getCurrentPage() {

return currentPage;

}

public int getPageSize() {

return pageSize;

}

public void setTotalRows(int totalRows) {

this.totalRows = totalRows;

this.process();

}

// public void setStartRow(int startRow) {

// this.startRow = startRow;

// }

// public void setTotalPages(int totalPages) {

// this.totalPages = totalPages;

// }

public void setCurrentPage(int currentPage) {

this.currentPage = currentPage;

this.process();

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

this.process();

}

public int getTotalRows() {

return totalRows;

}

public void first() {

currentPage = 1;

startRow = 0;

}

public void previous() {

if (currentPage == 1) {

return;

}

currentPage--;

startRow = (currentPage - 1) * pageSize;

}

public void next() {

// System.out.print("next:");

if (currentPage < totalPages) {

currentPage++;

}

startRow = (currentPage - 1) * pageSize;

}

public void last() {

currentPage = totalPages;

startRow = (currentPage - 1) * pageSize;

}

public void refresh(int _currentPage) {

currentPage = _currentPage;

if (currentPage > totalPages) {

last();

}

}

}

package commons.page;

import javax.servlet.http.HttpServletRequest;

public class PageDataTable {

private HtmlTable table = new HtmlTable();// 分页表格

private int operate = 0;// 操作,默认为第一页

private int gopage = 1;// 转到页码

private int cpage = 1;// 当前页

private int rowsize = 13;// 默认13行

private Pager pager = new Pager();// 分页操作类

private int mode = 0;// 模式0:内存分页,1:数据库查询分页

private PageDataCallBack callBack;// 适用于mode=1时(数据库查询分页),为HtmlTable提供DataModel数据模型回叫对象

private String id = "";// 分页表格ID,默认值为2098,该ID将在一个页面使用多个分页表格时作为唯一标识,标记正在操作的分页表格,如果有重复,将不能正常工作

private final static String DEFAULT_ID = "2098";

public PageDataTable(HttpServletRequest request, String id, int mode) {

this.init(request, id, mode);

}

public PageDataTable(HttpServletRequest request, int mode) {

this.init(request, DEFAULT_ID, mode);

}

public PageDataTable(HttpServletRequest request, String id) {

this.init(request, id, 0);

}

public PageDataTable(HttpServletRequest request) {

this.init(request, DEFAULT_ID, 0);

}

private void init(HttpServletRequest request, String id, int mode) {

this.mode = mode;

this.id = id;

String op = request.getParameter("__OPERATE__" + this.id);

String gopage = request.getParameter("__GOPAGE__" + this.id);

String cpage = request.getParameter("__CPAGE__" + this.id);

String maxsize = request.getParameter("__MAXROWSIZE__" + this.id);

// System.out.println("===" +op+"---"+gopage+"---"+cpage);

this.operate = op == null ? 0 : ("".equals(op) ? 4 : Integer.parseInt(op));

this.gopage = gopage == null ? 1 : Integer.parseInt(gopage);

this.cpage = cpage == null ? 1 : Integer.parseInt(cpage);

this.rowsize = maxsize == null ? -1 : Integer.parseInt(maxsize);

}

public void setTable(HtmlTable table) {

this.table = table;

}

public void setPageSize(int pageSize) {

this.pager.setPageSize(pageSize);

}

public void setTotalRows(int totalRows) {

this.pager.setTotalRows(totalRows);

}

public void setPageDataCallBack(PageDataCallBack callBack) {

this.callBack = callBack;

}

public String render() {

// 预分页操作处理

this.process();

// 内存分页设置其开始行索引为当前页开始索引,如果为数据库查询分页,则设置开始行索引为0

if (this.mode == 0) {

this.table.setStartRowIndex(this.pager.getStartRow());

} else {

this.table.setStartRowIndex(0);

}

// 设置表格最大显示行数

this.table.setMaxRowNum(this.pager.getPageSize());

// mode=1时,数据库查询分页设置分页表格DataModel对象,通常数据库查询也在此时执行

if (this.callBack != null) {

this.table.setDataModel(this.callBack.doPage(this.pager.getStartRow(), this.pager.getPageSize()));

}

// 分页表格界面组织,容器DIV

HtmlElement div = new HtmlElement("div");

div.addAttribute("class", "horse_data_page");

div.addAttribute("id", "horse_" + this.id);

// 分页表格DIV

HtmlElement div1 = new HtmlElement("div");

div1.addAttribute("class", "horse_page_table");

div1.addChild(this.table);

div.addChild(div1);

// 分页工具条

HtmlElement pageBar = new HtmlElement("Table");

pageBar.addAttribute("width", "100%");

HtmlElement row = new HtmlElement("tr");

row.addChild(this.getPageInfo1());

row.addChild(this.getPageInfo2());

row.addChild(this.getPageInfo3());

row.addChild(this.getPageInfo4());

pageBar.addChild(row);

div.addChild(pageBar);

// 操作用到的脚本

HtmlElement script = new HtmlElement("script");

script.addAttribute("language", "javascript");

script.setValue("function pageOperate" + this.id + "(value){var op=document.getElementById(/"__OPERATE__" + this.id + "/"); op.value=value; op.form.submit();}");

div.addChild(script);

return div.toHtml();

}

/**

* 处理翻页操作

*/

private void process() {

if (this.rowsize > 0) {

this.pager.setPageSize(this.rowsize);

}

this.pager.setCurrentPage(this.cpage);

if (this.operate == 0) {

this.pager.first();

} else if (this.operate == 1) {

this.pager.previous();

} else if (this.operate == 2) {

this.pager.next();

} else if (this.operate == 3) {

this.pager.last();

} else if (this.operate == 4) {

this.gopage = (this.gopage > this.pager.getTotalPages()) ? this.pager.getTotalPages() : this.gopage;

this.pager.setCurrentPage(this.gopage);

}

}

/**

* 分页信息1,输出记录信息,总共m页，n条记录

*

* @return

*/

private HtmlElement getPageInfo1() {

HtmlElement cell1 = new HtmlElement("td");

int st = this.pager.getStartRow() <= 0 ? 1 : this.pager.getStartRow();

st++;

int ed = (this.pager.getStartRow() + this.pager.getPageSize()) > this.pager.getTotalRows() ? this.pager.getTotalRows() : (this.pager.getStartRow() + this.pager

.getPageSize());

cell1.setValue("总共" + this.pager.getTotalPages() + "页，" + this.pager.getTotalRows() + "条记录");

return cell1;

}

/**

* 分页信息2,输出 首页 上一页 下一页 末页 翻页信息

*

* @return

*/

private HtmlElement getPageInfo2() {

HtmlElement cell = new HtmlElement("td");

HtmlElement a1 = new HtmlElement("a");

HtmlElement a2 = new HtmlElement("a");

HtmlElement a3 = new HtmlElement("a");

HtmlElement a4 = new HtmlElement("a");

a1.setValue(" 首页 ");

a2.setValue(" 上一页 ");

a3.setValue(" 下一页 ");

a4.setValue(" 末页 ");

if (this.pager.getCurrentPage() > 1) {

a1.addAttribute("href", "#");

a1.addAttribute("onclick", "pageOperate" + this.id + "('0')");

a2.addAttribute("href", "#");

a2.addAttribute("onclick", "pageOperate" + this.id + "('1')");

}

if (this.pager.getTotalPages() > this.pager.getCurrentPage()) {

a3.addAttribute("href", "#");

a3.addAttribute("onclick", "pageOperate" + this.id + "('2')");

a4.addAttribute("href", "#");

a4.addAttribute("onclick", "pageOperate" + this.id + "('3')");

}

cell.addChild(a1);

cell.addChild(a2);

if (this.pager.getTotalPages() >= 10) {

int p = this.pager.getTotalPages() / 10;

int st = (this.pager.getCurrentPage() - 5) > 0 ? (this.pager.getCurrentPage() - 5) : 1;

int ed = ((this.pager.getCurrentPage() + 5) <= p) ? (this.pager.getCurrentPage() + 5) : p;

for (int i = st; i < ed; i++) {

HtmlElement a = new HtmlElement("a");

a.addAttribute("href", "#");

a.addAttribute("onclick", "pageOperate('5')");

cell.addChild(a);

}

}

cell.addChild(a3);

cell.addChild(a4);

return cell;

}

/**

* 分页信息3 显示转到某一页

*

* @return

*/

private HtmlElement getPageInfo3() {

HtmlElement cell3 = new HtmlElement("td");

HtmlElement input = new HtmlElement("input");

input.addAttribute("id", "__GOPAGE__" + this.id);

input.addAttribute("name", "__GOPAGE__" + this.id);

input.addAttribute("type", "text");

input.addAttribute("size", "4");//

input.addAttribute("onKeyUp", "this.value=this.value.replace(///D/g,'')");

input.addAttribute("value", this.pager.getCurrentPage() + "");

cell3.setValue("第" + input.toHtml() + "页");

HtmlElement b = new HtmlElement("button");

b.addAttribute("onclick", "pageOperate" + this.id + "('4')");

b.setValue("转到");

cell3.addChild(b);

return cell3;

}

/**

* 分页栏信息列4

*

* @return

*/

private HtmlElement getPageInfo4() {

HtmlElement cell4 = new HtmlElement("td");

// 当前页隐藏域

HtmlElement input1 = new HtmlElement("input");

input1.addAttribute("id", "__CPAGE__" + this.id);

input1.addAttribute("name", "__CPAGE__" + this.id);

input1.addAttribute("type", "hidden");

input1.addAttribute("value", this.pager.getCurrentPage() + "");

// 操作隐藏域

HtmlElement input2 = new HtmlElement("input");

input2.addAttribute("id", "__OPERATE__" + this.id);

input2.addAttribute("name", "__OPERATE__" + this.id);

input2.addAttribute("type", "hidden");

// 当前最大显示数据行

HtmlElement input3 = new HtmlElement("input");

input3.addAttribute("id", "__MAXROWSIZE__" + this.id);

input3.addAttribute("name", "__MAXROWSIZE__" + this.id);

input3.addAttribute("value", (this.rowsize == -1 ? this.pager.getPageSize() : this.rowsize) + "");

input3.addAttribute("type", "hidden");

cell4.addChild(input1);

cell4.addChild(input2);

cell4.addChild(input3);

return cell4;

}

}