pagetag.java

ssh分页的一个例子内含数据库文件 在src文件夹下自己找

package com.pagedemo.taglib;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import com.pagedemo.common.PageResult;
import com.pagedemo.web.form.BaseForm;

public class PageTag extends TagSupport {
	private String formName;

	public String getFormName() {
		return formName;
	}

	public void setFormName(String formName) {
		this.formName = formName;
	}

	@Override
	public int doEndTag() throws JspException {
		try {
			BaseForm baseForm = null;
			if (formName != null && formName.trim().length() > 0) {
				baseForm = (BaseForm) pageContext.getRequest().getAttribute(
						formName);
				if (baseForm == null) {
					baseForm = (BaseForm) pageContext.getSession()
							.getAttribute(formName);
				}
				if (baseForm != null) {
					PageResult pageResult = baseForm.getPageResult();
					StringBuffer buffer = new StringBuffer();
					buffer.append("<div class='pageLink'>\r\n");
					buffer
							.append("共" + pageResult.getTotalRecord()
									+ "条记录\r\n");
					if (pageResult.isPre()) {
						buffer
								.append("<a href='javascript:page_go(1);'>首页</a>\r\n");
						buffer.append("<a href='javascript:page_go("
								+ (pageResult.getCurrent() - 1)
								+ ");'>上页</a>\r\n");
					}
					if (pageResult.isNext()) {
						buffer.append("<a href='javascript:page_go("
								+ (pageResult.getCurrent() + 1)
								+ ");'>下页</a>\r\n");
						buffer.append("<a href='javascript:page_go("
								+ (pageResult.getTotalPage())
								+ ");'>末页</a>\r\n");
					}
					buffer.append("到");
					buffer
							.append("<select onchange='page_go(this.value);' name='pageResult.current' id='pageNo'>\r\n");
					for (int i = 1; i <= pageResult.getTotalPage(); i++) {
						buffer.append("<option value=" + i + " ");
						buffer.append(pageResult.getCurrent() == i ? "selected"
								: "");
						buffer.append(">\r\n");
						buffer.append(i + "</option>");
					}
					buffer.append("</select>\r\n");

					buffer
							.append("每页<input type='text' id='size' name='pageResult.pageSize' value='"
									+ pageResult.getPageSize()
									+ "' size='2'/>条记录\r\n");
					buffer.append("</div>\r\n");

					buffer.append("<script>\r\n");
					buffer.append("function page_go(pageNo){\r\n").append(
							"if(check()){document.forms[0].pageNo.value=pageNo;\r\n")
							.append("document.forms[0].submit();\r\n}\r\n}\r\n");
					buffer.append("function check(){\r\n");
					buffer
							.append(
									"var size=document.forms[0].size.value;\r\n")
							.append(
									"if(size.length<1 || isNaN(size) || parseInt(size)<=0){\r\n")
							.append("alert('请输入正确的数字');return false;\r\n")
							.append("}document.forms[0].submit();\r\nreturn true;\r\n}\r\n");
					buffer.append("</script>\r\n");
					pageContext.getOut().println(buffer.toString());
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}

		return this.EVAL_PAGE;
	}

}