package com.freewebsys.core.taglib.gwtstyle;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import com.freewebsys.core.page.PageConf;
public class PageTaglib extends TagSupport {
private String id;// 标识不同分页,当一个页面有多个分页时,
private String action;
private int start;
private int limit;
private int total;
private String otherValue;
private String theme;
// 默认 分页跳转 js.兼容写法。兼容刷新分页 和 ajax分页。都调js函数。ajax要重写 goPage函数
private static final String DEFAULT_PAGE_JS = "<script type='text/javascript'>function goPage(url){location.href = url;}</script>";
// post 分页 js 使用post 分页 将支持查询分页，特殊字符& 和不能用get取得参数的分页
private static final String POST_PAGE_JS = "<script type='text/javascript'>function goPage(url){var myForm = document.getElementById('goPageFormId');myForm.action = url;myForm.submit();}</script>";
private static final String POST_PAGE_FORM_BEGIN = "<form id='goPageFormId' action='' method='post'>";
private static final String POST_PAGE_FORM_END = "</form>";
// 分页 div 开始
private final String DEFAULT_THEME_BEGIN = "<div class='pagination' id='Pagination'>";
private final String MINI_THEME_BEGIN = "<div class='paginationMini' id='PaginationMini'>";
// 分页 div 结束
private final String DEFAULT_THEME_END = "</div>";
// 分页字符串
private final String PAGE_A = "<a href=\"javaScript:void(0);\" onclick=\"goPage('";
// 默认样式模板
@Override
public int doStartTag() throws JspException {
try {
if (total <= limit) {// 如果还不够一页 就不显示
return super.doEndTag();
}
// 初始化参数.每次独立计算.否则分页有问题.
PageConf pageConf = new PageConf(start, limit, total);
String ctx = pageContext.getServletContext().getContextPath() + "/";
//ctx += action + findOtherValue();
if (action.indexOf("?") >= 0) {// 如果存在?号用&
ctx += action + "&" + findOtherValue();
} else {// 否则用?
ctx += action + "?" + findOtherValue();
}
PageConf pageConfFirst = new PageConf(start, limit, total);
String firstUrl = ctx;
PageConf pageConfPrev = new PageConf(start, limit, total);
String prevUrl = ctx;
PageConf pageConfNext = new PageConf(start, limit, total);
String nextUrl = ctx;
PageConf pageConfLast = new PageConf(start, limit, total);
String lastUrl = ctx;
if (pageConf.hasPrevious()) {
pageConfFirst.getFirst();
firstUrl += "&start=" + pageConfFirst.getStart();
// firstUrl += "-start~" + pageConfFirst.getStart();
pageConfPrev.getPrevious();
prevUrl += "&start=" + pageConfPrev.getStart();
// prevUrl += "-start~" + pageConfPrev.getStart();
}
if (pageConf.hasNext()) {
pageConfNext.getNext();
nextUrl += "&start=" + pageConfNext.getStart();
// nextUrl += "-start~" + pageConfNext.getStart();
pageConfLast.getLast();
lastUrl += "&start=" + pageConfLast.getStart();
// lastUrl += "-start~" + pageConfLast.getStart();
}
// 直接将数据写到页面
String str = genCenterButtons(start, limit, total, ctx);
if (theme == null || theme.equals("")) {
writeToPage(DEFAULT_PAGE_JS);// 默认跳转函数
writeToPage(DEFAULT_THEME_BEGIN);
writeToPage(str);
} else if (theme.equals("post")) {// 执行post分页
writeToPage(POST_PAGE_JS);// 默认跳转函数
writeToPage(POST_PAGE_FORM_BEGIN);
writeToPage(findOtherValueHidden());
writeToPage(POST_PAGE_FORM_END);
writeToPage(DEFAULT_THEME_BEGIN);
writeToPage(str);
} else if (theme.equals("ajax")) {// 普通ajax分页
writeToPage(DEFAULT_THEME_BEGIN);
writeToPage(str);
} else if (theme.equals("miniAjax")) {// mini型ajax分页
writeToPage(MINI_THEME_BEGIN);
if (id != null) {// 标识不用分页
str = str.replace("goPage", "goMiniPage_" + id);
} else {
str = str.replace("goPage", "goMiniPage");
}
writeToPage(str);
}
// 如果是ajax就要在页面重写goPage函数
writeToPage(DEFAULT_THEME_END);
} catch (Exception e) {
e.printStackTrace();
}
return super.doEndTag();
}
/**
* 生成多个跳转按钮方法,如1，2，3，4，5这样的按钮跳转最大7页跳转
*/
private String genCenterButtons(int start, int limit, int total, String ctx) {
// 初始化参数.每次独立计算.否则分页有问题.
PageConf pageConf = new PageConf(start, limit, total);
PageConf pageConfTemp1 = new PageConf(start, limit, total);
PageConf pageConfTemp2 = new PageConf(start, limit, total);
// 结束页
PageConf pageConfTempLast = new PageConf(start, limit, total);
//
pageConfTempLast.getLast();
// 字符串拼写.
StringBuilder strOut = new StringBuilder();
// 设置开始为当前页往前3页,最小1
int begin = Math.max(1, (pageConf.getCurrentPage() + 1) - 3);
// 设置结束为当前页往后3页,最大到总页数
int end = Math.min((pageConf.getCurrentPage() + 1) + 3,
pageConf.getTotalPage());
int abs = 5 - Math.abs(pageConfTempLast.getCurrentPage()
- pageConf.getCurrentPage());
if (abs > 0) {
begin = pageConf.getCurrentPage() - abs;
begin = Math.min(begin, (pageConf.getCurrentPage() + 1) - 3);
begin = Math.max(1, begin);
}
// 计算当前页和首页的距离
abs = 7 - pageConf.getCurrentPage();
if (abs > 0) {
end = pageConf.getCurrentPage() + abs;
end = Math.max((pageConf.getCurrentPage() + 1) + 3, end);
end = Math.min(end, pageConf.getTotalPage());
}
if (pageConf.getTotalPage() > 7) {// 如果大于7显示首页末页
// 显示前一页
if (pageConfTemp1.hasPrevious()) {
pageConfTemp1.getPrevious();
strOut.append(PAGE_A + ctx + "&start="
+ pageConfTemp1.getStart() + "');\">");
strOut.append("上一页</a>");
}
if (pageConf.getCurrentPage() > 3) {
// 显示第 1
strOut.append(PAGE_A + ctx + "&start=" + (0) + "');\">");
strOut.append(1);
strOut.append("</a>");
if (pageConf.getCurrentPage() > 4) {
// 显示第 2 页
strOut.append(PAGE_A + ctx + "&start="
+ (0 + pageConf.getLimit()) + "');\">");
strOut.append(2);
strOut.append("</a>");
}
strOut.append("…");
}
}
// if(pageConf.getCurrentPage())
// 循环显示数字
for (int i = begin; i <= end; i++) {
// 循环多个table的button
int startTemp = (i - 1) * pageConf.getLimit();
if (i == (pageConf.getCurrentPage() + 1)) {
strOut.append("<span class='current'>");
strOut.append(i);// 当前页显示禁用
strOut.append("</span>");
} else {
strOut.append(PAGE_A + ctx + "&start=" + startTemp + "');\">");
strOut.append(i);
strOut.append("</a>");
}
}
// 末页显示,显示最后一页和倒数第二页
if (pageConf.getTotalPage() > 7) {// 如果大于7显示首页末页
if (pageConf.getCurrentPage() < (pageConfTempLast.getCurrentPage() - 3)) {
// 如果当前页是倒数第4页就不显示
strOut.append("…");
// System.out.println(pageConf.getCurrentPage() + "/"
// + pageConfTempLast.getCurrentPage());
if (pageConf.getCurrentPage() < (pageConfTempLast
.getCurrentPage() - 4)) {
// 如果当前页是倒数第4页就不显示倒数第2页
strOut.append(PAGE_A
+ ctx
+ "&start="
+ (pageConfTempLast.getStart() - pageConf
.getLimit()) + "');\">");
strOut.append(pageConfTempLast.getCurrentPage());
strOut.append("</a>");
}
strOut.append(PAGE_A + ctx + "&start="
+ pageConfTempLast.getStart() + "');\">");
strOut.append(pageConfTempLast.getCurrentPage() + 1);
strOut.append("</a>");
}
// 显示下一页
if (pageConfTemp2.hasNext()) {
pageConfTemp2.getNext();
strOut.append(PAGE_A + ctx + "&start="
+ pageConfTemp2.getStart() + "');\">");
strOut.append("下一页</a>");
}
}
return strOut.toString();
}
/**
* 添加其他参数.
*/
private String findOtherValue() {
String tempValue = "";
if (theme != null && theme.equals("post")) {
// 如果是post分页,不使用get方式传入其他参数用表单提交
return "";
}
if (otherValue != null && !"".equals(otherValue)) {
// 将数据按照','进行分开.
String[] values = otherValue.split(",");
for (int i = 0; i < values.length; i++) {
// 从request里面取得数据value.
String temp = (null == pageContext.getRequest().getParameter(
values[i]) ? "" : pageContext.getRequest()
.getParameter(values[i]));
if (i == 0) {// 如果是第一个.直接等于.否则就添加&
tempValue = values[i] + "=" + temp;
} else {
tempValue += "&" + values[i] + "=" + temp;
}
// tempValue += "-" + values[i] + "~" + temp;
}
}
return tempValue;
}
/**
* 添加其他参数.并存入hidden里面
*/
private String findOtherValueHidden() {
String tempValue = "";
if (otherValue != null && !"".equals(otherValue)) {
// 将数据按照','进行分开.
String[] values = otherValue.split(",");
for (int i = 0; i < values.length; i++) {
// 从request里面取得数据value.
String temp = (null == pageContext.getRequest().getParameter(
values[i]) ? "" : pageContext.getRequest()
.getParameter(values[i]));
tempValue += "<input type='hidden' name='" + values[i]
+ "' value='" + temp + "'/>";
}
}
return tempValue;
}
@Override
public int doEndTag() throws JspException {
try {
// 读取模板
// writeToPage("<!--GridPanelPage结束-->");// 完成一个h3不读取模板
} catch (Exception e) {
e.printStackTrace();
}
return super.doEndTag();
}
private void writeToPage(String strOut) {
try {
pageContext.getOut().print(strOut);
} catch (Exception e) {
e.printStackTrace();
}
}
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
public int getLimit() {
return limit;
}
public void setLimit(int limit) {
this.limit = limit;
}
public String getOtherValue() {
return otherValue;
}
public void setOtherValue(String otherValue) {
this.otherValue = otherValue;
}
public String getAction() {
return action;
}
public void setAction(String action) {
this.action = action;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public String getTheme() {
return theme;
}
public void setTheme(String theme) {
this.theme = theme;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}