自定义通用分页
第一步配置PageBean（util）
public class PageBean {
private int page = 1;// 页码
private int rows = 3;// 行数/页大小
private int total = 0;// 总记录数
private boolean pagination = true;// 默认分页
private String url;// 上一次请求的地址
private Map<String, String[]> parameterMap;// 上一次请求的所有参数
public PageBean() {
super();
}
/**
* 对分页bean进行初始化
*
* @param request
*/
public void setRequest(HttpServletRequest request) {
// 公共参数
this.setPage(request.getParameter("page"));
this.setRows(request.getParameter("rows"));
this.setPagination(request.getParameter("pagination"));
// 请求地址和请求参数
this.setUrl(request.getContextPath() + request.getServletPath());
this.setParameterMap(request.getParameterMap());
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public Map<String, String[]> getParameterMap() {
return parameterMap;
}
public void setParameterMap(Map<String, String[]> parameterMap) {
this.parameterMap = parameterMap;
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public void setPage(String page) {
if (null != page && !"".equals(page.trim())) {
this.page = Integer.parseInt(page);
}
}
public int getRows() {
return rows;
}
public void setRows(int rows) {
this.rows = rows;
}
public void setRows(String rows) {
if (null != rows && !"".equals(rows.trim())) {
this.rows = Integer.parseInt(rows);
}
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public void setTotal(String total) {
this.total = Integer.parseInt(total);
}
public boolean isPagination() {
return pagination;
}
public void setPagination(boolean pagination) {
this.pagination = pagination;
}
public void setPagination(String pagination) {
if ("false".equals(pagination)) {
this.pagination = false;
}
}
/**
* 下一页
*
* @return
*/
public int getNextPage() {
int nextPage = page + 1;
if (nextPage > this.getMaxPage()) {
nextPage = this.getMaxPage();
}
return nextPage;
}
/**
* 上一页
*
* @return
*/
public int getPreviousPage() {
int previousPage = page - 1;
if (previousPage < 1) {
previousPage = 1;
}
return previousPage;
}
/**
* 最大页码
*
* @return
*/
public int getMaxPage() {
return total % rows == 0 ? total / rows : total / rows + 1;
}
/**
* 起始记录的下标
*
* @return
*/
public int getStartIndex() {
return (page - 1) * rows;
}
@Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
}
第二步加上俩个帮助类(tag)
PageTag
public class PageTag extends BodyTagSupport {
private static final long serialVersionUID = 8003507841172246203L;
private PageBean pageBean;
public PageTag() {
super();
}
public PageBean getPageBean() {
return pageBean;
}
public void setPageBean(PageBean pageBean) {
this.pageBean = pageBean;
}
@Override
public int doStartTag() throws JspException {
try {
JspWriter out = pageContext.getOut();
out.println(this.toHtml());
return SKIP_BODY;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private String toHtml() {
StringBuffer bf = new StringBuffer();
if (null == pageBean || !pageBean.isPagination()) {
return bf.toString();
}
// 1. 生成表单
bf.append("<form id='pageBeanForm' action='" + pageBean.getUrl() + "' method='post'>");
bf.append("<input type='hidden' name='page' value=''>");
for (Map.Entry<String, String[]> entry : pageBean.getParameterMap().entrySet()) {
String name = entry.getKey();
String[] values = entry.getValue();
if ("page".equals(name)) {
continue;
}
for (String value : values) {
bf.append("<input type='hidden' name='" + name + "' value='" + value + "'>");
}
}
bf.append("</form>");
// 2. 生成按钮
bf.append("<div style='text-align: right;font-size: 12px;'>每页" + pageBean.getRows() + "条，共"
+ pageBean.getTotal() + "条，当前第" + pageBean.getPage() + "页，共" + pageBean.getMaxPage()
+ "页 <a href='javascript:doGotoPage(1)'>首 页</a> <a href='javascript:doGotoPage("
+ pageBean.getPreviousPage() + ")'>上一页</a> <a href='javascript:doGotoPage("
+ pageBean.getNextPage() + ")'>下一页</a> <a href='javascript:doGotoPage("
+ pageBean.getMaxPage()
+ ")'>尾 页</a> <input id='pageNumber' type='text' style='text-align: center;width: 30px;'> <a href='javascript:doSkipPage();'>GO</a></div>");
// 3. 动态生成js
bf.append("<script type='text/javascript'>");
bf.append("function doGotoPage(page){");
bf.append(" var form = document.getElementById('pageBeanForm');");
bf.append(" form.page.value = page;");
bf.append(" form.submit();");
bf.append("}");
bf.append("function doSkipPage(page){");
bf.append(" var page = document.getElementById('pageNumber').value;");
bf.append(" if(!page||isNaN(page)||parseInt(page)<1||parseInt(page)>"+pageBean.getMaxPage()+"){");
bf.append(" alert('页码必须为1~"+pageBean.getMaxPage()+"之间数字');");
bf.append(" document.getElementById('pageNumber').value = '';");
bf.append(" return;");
bf.append(" }");
bf.append(" doGotoPage(parseInt(page));");
bf.append("}");
bf.append("</script>");
bf.append("");
bf.append("");
bf.append("");
bf.append("");
bf.append("");
return bf.toString();
}
RownumTag
public class RownumTag extends BodyTagSupport {
private static final long serialVersionUID = 8003507841172246203L;
private PageBean pageBean;
private Integer count;
public RownumTag() {
super();
}
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
public PageBean getPageBean() {
return pageBean;
}
public void setPageBean(PageBean pageBean) {
this.pageBean = pageBean;
}
@Override
public int doStartTag() throws JspException {
try {
int rownum = (pageBean.getPage() - 1) * pageBean.getRows() + count;
JspWriter out = pageContext.getOut();
out.println(rownum + "");
return SKIP_BODY;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
加上自定义的tld
<tag>
<name>rownum</name>
<tag-class>com.zking.tag.RownumTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>pageBean</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>count</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
在jsp界面引用
<%@taglib prefix=“z” uri="/zking" %>
《div》<z:page pageBean="${pageBean}"/>
《/div》