完善通用分页一的代码问题（使内容页面话）
新加BookServlet.java和bookList.jsp以及web.xml文件
BookServlet.java
package com.onlyK.web;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.onlyK.dao.BookDao;
import com.onlyK.entity.Book;
import com.onlyK.util.PageBean;
public class BookServlet extends HttpServlet{
private static final long serialVersionUID = -3695879107863098178L;
private BookDao bookDao=new BookDao();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String bname = req.getParameter("bname");
Book bk=new Book();
bk.setBname(bname);
PageBean pageBean=new PageBean();
try {
List<Book> list = bookDao.list(bk, pageBean);
req.setAttribute("bookList", list);
req.getRequestDispatcher("/bookList.jsp").forward(req, resp);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(pageBean);
}
}
bookList.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<h2>小说目录</h2>
<br>
<form action="${pageContext.request.contextPath}/bookServlet"
method="post">
书名：<input type="text" name="bname"> <input type="submit"
value="确定">
</form>
<table border="1" width="100%">
<tr>
<td>编号</td>
<td>名称</td>
<td>价格</td>
</tr>
<c:forEach items="${bookList }" var="b">
<tr>
<td>${b.bid }</td>
<td>${b.bname }</td>
<td>${b.price }</td>
</tr>
</c:forEach>
</table>
<form id='pageBeanForm' action='' method='post'>
<input type='hidden' name=''> <input type='hidden' name='page'>
</form>
<div style='text-align: right; font-size: 12px;'>
每页N条，共N条，第N页，共N页 <a href='javascript:gotoPage(?)'>首页</a> <a
href='javascript:gotoPage(?)'>上一页</a> <a
href='javascript:gotoPage(?)'>下一页</a> <a
href='javascript:gotoPage(?)'>尾页</a> <input type='text'
id='skipPage'
style='text-align: center; font-size: 12px; width: 50px;'> <a
href='javascript:skipPage()'>Go</a>
</div>
<script type='text/javascript'>
function gotoPage(page) {
document.getElementById('pageBeanForm').page.value = page;
document.getElementById('pageBeanForm').submit();
}
function skipPage() {
var page = document.getElementById('skipPage').value;
if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>maxPage){
alert('请输入1~N的数字');
return;
}
gotoPage(page);
}
</script>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>PageWeb2</display-name>
<!-- 解决乱码问题 -->
<filter>
<filter-name>encodingFiter</filter-name>
<filter-class>com.onlyK.util.EncodingFiter</filter-class>
</filter>
<filter-mapping>
<filter-name>encodingFiter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 记载数据 -->
<servlet>
<servlet-name>bookServlet</servlet-name>
<servlet-class>com.onlyK.web.BookServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>bookServlet</servlet-name>
<url-pattern>/bookServlet</url-pattern>
</servlet-mapping>
</web-app>
结果为
通用分页核心思路
将上一次查询请求再发一次，只不过页码变了
改装pageBean
package com.onlyK.util
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
/**
* 分页工具类
*
*/
public class PageBean {
private int page = 1;// 页码
private int rows = 10;// 页大小
private int total = 0;// 总记录数
//改造 保留上一次的请求地址
private String url;
//保留上一次请求所携带的参数
private Map<String , String[]> paMap=new HashMap<>();
/**
* pageBean初始化方法
* @param req
*/
public void setRequest(HttpServletRequest req) {
this.setPage(req.getParameter("page"));
this.setRows(req.getParameter("rows"));
this.setPagination(req.getParameter("pagination"));
this.setUrl(req.getRequestURL().toString());
this.setPaMap(req.getParameterMap());
}
private void setPagination(String pagination) {
if("false".equals(pagination)) {
this.setPagination(false);
}
}
private void setRows(String rows) {
if(StringUtils.isNotBlank(rows)) {
this.setRows(Integer.valueOf(rows));
}
}
private void setPage(String page) {
if(StringUtils.isNotBlank(page)) {
this.setPage(Integer.valueOf(page));
}
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public Map<String, String[]> getPaMap() {
return paMap;
}
public void setPaMap(Map<String, String[]> paMap) {
this.paMap = paMap;
}
private boolean pagination = true;// 是否分页
public PageBean() {
super();
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getRows() {
return rows;
}
public void setRows(int rows) {
this.rows = 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;
}
/**
* 获得起始记录的下标
*
* @return
*/
public int getStartIndex() {
return (this.page - 1) * this.rows;
}
@Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
}
/**
* 最大页码
* @return
*/
public int getMaxPage() {
return this.total % this.rows==0 ? this.total/this.rows : this.total/this.rows+1;
}
/**
* 获取下一页
* @return
*/
public int getNextPage() {
return this.page < this.getMaxPage() ? this.page+1 : this.page;
}
/**
* 获取上一页
* @return
*/
public int getPreviousPage() {
return this.page > 1 ? this.page-1 : this.page;
}
}
封装
BookServlet.java
package com.onlyK.web;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.onlyK.dao.BookDao;
import com.onlyK.entity.Book;
import com.onlyK.util.PageBean;
public class BookServlet extends HttpServlet{
private static final long serialVersionUID = -3695879107863098178L;
private BookDao bookDao=new BookDao();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String bname = req.getParameter("bname");
Book bk=new Book();
bk.setBname(bname);
PageBean pageBean=new PageBean();
pageBean.setRequest(req);
//保留的携带参数
Map<String, String[]> parameterMap = req.getParameterMap();
//保留携带的地址
String url = req.getRequestURL().toString();
try {
List<Book> list = bookDao.list(bk, pageBean);
req.setAttribute("bookList", list);
req.setAttribute("pageBean", pageBean);
req.getRequestDispatcher("/bookList.jsp").forward(req, resp);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(pageBean);
}
}
PageTag.java
package com.onlyK.tag;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;
import com.onlyK.util.PageBean;
import com.sun.org.apache.xml.internal.serializer.ToHTMLSAXHandler;
public class PageTag extends BodyTagSupport {
private static final long serialVersionUID = 3083251924440447855L;
private PageBean pageBean;
public PageBean getPageBean() {
return pageBean;
}
public void setPageBean(PageBean pageBean) {
this.pageBean = pageBean;
}
@Override
public int doStartTag() throws JspException {
JspWriter out = pageContext.getOut();
try {
out.print(ToHTML());
} catch (IOException e) {
e.printStackTrace();
}
return SKIP_BODY;
}
private String ToHTML() {
StringBuilder sb=new StringBuilder();
//拼接下一分页请求所提交的分页表单
sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
sb.append("<input type='hidden' name='page'>");
Map<String, String[]> paMap = pageBean.getPaMap();
if(paMap!=null && paMap.size()>0) {
Set<Entry<String, String[]>> entrySet = paMap.entrySet();
for (Entry<String, String[]> entry : entrySet) {
for (String value: entry.getValue()) {
if(!"page".equals(entry.getKey())) {
sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+value+"'>");
}
}
}
}
sb.append("</form>");
//拼接分页条
sb.append("<div style='text-align: right; font-size: 12px;'>");
sb.append(" 每页"+pageBean.getRows()+"条，共"+pageBean.getTotal()+"条，第"+pageBean.getPage()+"页，共"+pageBean.getMaxPage()+"页 <a ");
sb.append(" href='javascript:gotoPage(1)'>首页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.getPreviousPage()+")'>上一页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.getNextPage()+")'>下一页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a> <input type='text'");
sb.append(" id='skipPage'");
sb.append(" style='text-align: center; font-size: 12px; width: 50px;'> <a");
sb.append(" href='javascript:skipPage()'>Go</a>");
sb.append("</div>");
//拼接分页的javaScript代码
sb.append("<script type='text/javascript'>");
sb.append(" function gotoPage(page) {");
sb.append(" document.getElementById('pageBeanForm').page.value = page;");
sb.append(" document.getElementById('pageBeanForm').submit();");
sb.append("}");
sb.append(" function skipPage() {");
sb.append(" var page = document.getElementById('skipPage').value;");
sb.append(" if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
sb.append(" alert('请输入1~N的数字');");
sb.append(" return;");
sb.append(" }");
sb.append(" gotoPage(page);");
sb.append(" }");
sb.append("</script>");
return sb.toString();
}
}
PageBean.java
package com.onlyK.util;import java.util.HashMap;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
/**
* 分页工具类
*
*/
public class PageBean {
private int page = 1;// 页码
private int rows = 10;// 页大小
private int total = 0;// 总记录数
//改造 保留上一次的请求地址
private String url;
//保留上一次请求所携带的参数
private Map<String , String[]> paMap=new HashMap<>();
/**
* pageBean初始化方法
* @param req
*/
public void setRequest(HttpServletRequest req) {
this.setPage(req.getParameter("page"));
this.setRows(req.getParameter("rows"));
this.setPagination(req.getParameter("pagination"));
this.setUrl(req.getRequestURL().toString());
this.setPaMap(req.getParameterMap());
}
private void setPagination(String pagination) {
if("false".equals(pagination)) {
this.setPagination(false);
}
}
private void setRows(String rows) {
if(StringUtils.isNotBlank(rows)) {
this.setRows(Integer.valueOf(rows));
}
}
private void setPage(String page) {
if(StringUtils.isNotBlank(page)) {
this.setPage(Integer.valueOf(page));
}
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public Map<String, String[]> getPaMap() {
return paMap;
}
public void setPaMap(Map<String, String[]> paMap) {
this.paMap = paMap;
}
private boolean pagination = true;// 是否分页
public PageBean() {
super();
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getRows() {
return rows;
}
public void setRows(int rows) {
this.rows = 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;
}
/**
* 获得起始记录的下标
*
* @return
*/
public int getStartIndex() {
return (this.page - 1) * this.rows;
}
@Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
}
/**
* 最大页码
* @return
*/
public int getMaxPage() {
return this.total % this.rows==0 ? this.total/this.rows : this.total/this.rows+1;
}
/**
* 获取下一页
* @return
*/
public int getNextPage() {
return this.page < this.getMaxPage() ? this.page+1 : this.page;
}
/**
* 获取上一页
* @return
*/
public int getPreviousPage() {
return this.page > 1 ? this.page-1 : this.page;
}
}
z.tld
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
version="2.1">
<description>onlyK 1.1 core library</description>
<display-name>onlyK core</display-name>
<tlib-version>1.1</tlib-version>
<short-name>c</short-name>
<uri>/onlyK</uri>
<tag>
<name>page</name>
<tag-class>com.onlyK.tag.PageTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<name>pageBean</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
bookList.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="/onlyK" prefix="z" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<h2>小说目录</h2>
<br>
<form action="${pageContext.request.contextPath}/bookServlet"
method="post">
<!-- 每页20行数据 -->
<!-- <input type="hidden" name='rows' value="20" > -->
<!-- 不分页 -->
<input type="hidden" name='pagination' value="false" >
书名：<input type="text" name="bname">
<!-- 书籍的类别：<input type="checkbox" name="bookType" value="1">玄幻
<input type="checkbox" name="bookType" value="2">都市
<input type="checkbox" name="bookType" value="3">言情 -->
<input type="submit"
value="确定">
</form>
<table border="1" width="100%">
<tr>
<td>编号</td>
<td>名称</td>
<td>价格</td>
</tr>
<c:forEach items="${bookList }" var="b">
<tr>
<td>${b.bid }</td>
<td>${b.bname }</td>
<td>${b.price }</td>
</tr>
</c:forEach>
</table>
<z:page pageBean="${pageBean }"></z:page>
<%-- <form id='pageBeanForm' action=' ${pageBean.url }' method='post'>
<input type='hidden' name=''> <input type='hidden' name='page'>
</form>
<div style='text-align: right; font-size: 12px;'>
每页N条，共N条，第N页，共N页 <a href='javascript:gotoPage(?)'>首页</a> <a
href='javascript:gotoPage(?)'>上一页</a> <a
href='javascript:gotoPage(?)'>下一页</a> <a
href='javascript:gotoPage(?)'>尾页</a> <input type='text'
id='skipPage'
style='text-align: center; font-size: 12px; width: 50px;'> <a
href='javascript:skipPage()'>Go</a>
</div> --%>
<!-- <script type='text/javascript'>
function gotoPage(page) {
document.getElementById('pageBeanForm').page.value = page;
document.getElementById('pageBeanForm').submit();
}
function skipPage() {
var page = document.getElementById('skipPage').value;
if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>maxPage){
alert('请输入1~N的数字');
return;
}
gotoPage(page);
}
</script> -->
</body>
</html>
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