package com.bean;
public class Example7_2_Bean {
String[] columnName;// 存放列名
String[][] tableRecord = null;// 存放查询到的记录
int pageSize = 1;
int totalPages = 1;
int currentPage = 1;
public Example7_2_Bean(){
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public String[] getColumnName() {
return columnName;
}
public void setColumnName(String[] columnName) {
this.columnName = columnName;
}
public String[][] getTableRecord() {
return tableRecord;
}
public void setTableRecord(String[][] tableRecord) {
this.tableRecord = tableRecord;
}
}
package com.servlet;
import com.bean.Example7_2_Bean;
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Example7_2_Servlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
Connection con;
Statement sql;
ResultSet rs = null;
@Override
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
super.init(config);
}
public String handleString(String s) {
try {
byte b[] = s.getBytes("iso-8859-1");
s = new String(b);
} catch (Exception ee) {
}
return s;
}
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
Example7_2_Bean resultBean = null;// 放在外面是为了判断这个是否为空，
try {
resultBean = (Example7_2_Bean) req.getAttribute("resultBean");
// 获取的是bean的对象
if (resultBean == null) {// 对获取到的javabean对象进行判断
resultBean = new Example7_2_Bean();// 若为空则创建javabean对象
req.setAttribute("resultBean", resultBean);//
}
} catch (Exception e) {
// TODO: handle exception
resultBean = new Example7_2_Bean();// 若为空则创建javabean对象
req.setAttribute("resultBean", resultBean);//
}
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (Exception e) {
}
String dataBase = req.getParameter("dataBase");
String tableName = req.getParameter("tableName");
String nu = req.getParameter("number");
String na = req.getParameter("name");
String mT = req.getParameter("madeTime");
String pr = req.getParameter("price");
// trim函数用于删除文本的空格
Float p = Float.parseFloat(pr);
String condition = "insert into" + tableName + "values" + "(" + "‘"
+ nu + "‘,‘" + na + "‘,‘" + mT + "‘," + p + ")";
boolean boo = (nu.length() > 0);
try {
String uri = "jdbc:mysql://127.0.0.1/warehouse?"
+ "user=root&password=123456&characterEncoding=gb2312";
con = DriverManager.getConnection(uri);
sql = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_READ_ONLY);
if (boo)
sql.executeUpdate(condition);
boolean m = rs.next();
if (m == true) {
// 调用登入成功的方法:
success(req, resp);
} else {
String backNews = "你输入的用户名不存在或密码不匹配";
// 调用失败的方法
fail(req, resp, backNews);
}
con.close();
// boolean m = rs.next();
// if (m == true) {
// // 调用登入成功的方法:
// success(req, resp, logname, password);
//
// RequestDispatcher dispatcher = req
// .getRequestDispatcher("shanping/showRecord.jsp");
// dispatcher.forward(req, resp);
//
// } else {
// String backNews = "你输入的用户名不存在或密码不匹配";
// // 调用失败的方法
// fail(req, resp, logname, backNews);
// }
} catch (SQLException e) {
System.out.println(e);
fail(req, resp, "添加记录失败" + e.toString());
}
}
public void success(HttpServletRequest req, HttpServletResponse resp)
throws SQLException, ServletException, IOException {
// TODO Auto-generated method stub
Example7_2_Bean resultBean = null;// 放在外面是为了判断这个是否为空，
try {
resultBean = (Example7_2_Bean) req.getAttribute("resultBean");
// 获取的是bean的对象
if (resultBean == null) {// 对获取到的javabean对象进行判断
resultBean = new Example7_2_Bean();// 若为空则创建javabean对象
req.setAttribute("resultBean", resultBean);//
}
} catch (Exception e) {
// TODO: handle exception
resultBean = new Example7_2_Bean();// 若为空则创建javabean对象
req.setAttribute("resultBean", resultBean);//
}
rs = sql.executeQuery("select * from product");
ResultSetMetaData metaData = rs.getMetaData();
int columnCount = metaData.getColumnCount();// 得到结果集的列数
String[] columnName = new String[columnCount];
for (int i = 0; i < columnName.length; i++) {
columnName[i] = metaData.getColumnName(i + 1);// 获得列名
}
resultBean.setColumnName(columnName);// 更新javabean数据模型
rs.last();// 为BoolEAN类型
int rowNumber = rs.getRow();// 得到记录数
String[][] tableRecord = resultBean.getTableRecord();
tableRecord = new String[rowNumber][columnCount];
rs.beforeFirst();
int i = 0;
while (rs.next()) {
for (int k = 0; k < columnCount; k++) {
tableRecord[i][k] = rs.getString(k + 1);
i++;
}
resultBean.setTableRecord(tableRecord);// 更新javabean数据模型
con.close();
RequestDispatcher dispatcher = req
.getRequestDispatcher("shanping/showRecord.jsp");
dispatcher.forward(req, resp);
}
}
// public void success(HttpServletRequest req, HttpServletResponse resp,
// String logname, String password) {
// // TODO Auto-generated method stub
//
// Example7_2_Bean resultBean = null;// 放在外面是为了判断这个是否为空，
// try {
// resultBean = (Example7_2_Bean) req.getAttribute("resultBean");//
// 获取的是bean的对象
// if (resultBean == null) {// 对获取到的javabean对象进行判断
// resultBean = new Example7_2_Bean();// 若为空则创建javabean对象
// req.setAttribute("resultBean", resultBean);//
// }
//
// } catch (Exception e) {
// // TODO: handle exception
// resultBean = new Example7_2_Bean();// 若为空则创建javabean对象
// req.setAttribute("resultBean", resultBean);//
// }
//
//
// }
// }
public void fail(HttpServletRequest req, HttpServletResponse resp,
String backNews) {
// TODO Auto-generated method stub
resp.setContentType("text/html;charset=gb2312");
try {
PrintWriter out = resp.getWriter();
out.print("<html><body>");
out.print("<h2>" + backNews + "<h2>");
out.print("<a href=‘example7_2.jsp‘>输入正确信息");
out.print("</html></body>");
} catch (IOException exp) {
}
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
}
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP ‘example7_2.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
查询warehouse数据库product表中
<form action="<%=request.getContextPath()%>/Example7_2_Servlet" method="post">
<br>产品号<input type="text" name="number" >
<br>名称:<input type="text" name="name" >
<br>生产日期:<input type="text" name="madeTime" >
<br>价格:<input type="text" name="price" >
<input
type="submit" name="g" value="提交">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<jsp:useBean id="resultBean" class="com.bean.Example7_2_Bean"
scope="request"></jsp:useBean>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP ‘showRecord.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<br>当前显示的内容是:
<jsp:setProperty property="pageSize" name="resultBean" param="pageSize"/>
<jsp:setProperty property="currentPage" name="resultBean" param="currentPage"/>
<table border="1">
<%
String[] columnName = resultBean.getColumnName();
if(columnName!=null){
out.print("<tr>");
for(int i=0;i<columnName.length;i++){
out.print("<th>"+columnName[i]+"</th>");
}
out.print("<tr>");
}
String[][] record = resultBean.getTableRecord();
if(record==null){
out.print("没有记录");
return;
}
int totalRecord = record.length;
out.println("全部记录数" + totalRecord);//全部记录数
int pageSize = resultBean.getPageSize();//每页显示的记录数
int totalPages = resultBean.getTotalPages();
if (totalRecord % pageSize == 0)
totalPages = totalRecord / pageSize;//总页数
else
totalPages = totalRecord / pageSize + 1;
resultBean.setPageSize(pageSize);
resultBean.setTotalPages(totalPages);
if (totalPages >= 1) {
if (resultBean.getCurrentPage() < 1)
resultBean.setCurrentPage(resultBean.getTotalPages());
if (resultBean.getCurrentPage() > resultBean.getTotalPages())
resultBean.setCurrentPage(1);
int index = (resultBean.getCurrentPage() - 1) * pageSize;
int start=index;//查询位置移动到currentPage页起始位置
for (int i = index; i < pageSize+index; i++) {
if(i==totalRecord)
break;
out.print("<tr>");
for(int j=0;j<columnName.length;j++){
out.print("<td>"+record[i][j]+"</td>");}
}
out.print("</tr>");
}
%>
</table>
<br>每页最多显示<jsp:getProperty property="pageSize" name="resultBean" />条信息
<br>当前显示第
<font color=blue> <jsp:getProperty property="currentPage"
name="resultBean" /> 页，共有<jsp:getProperty property="totalPages"
name="resultBean" /></font>页。
<table>
<tr>
<td>
<form action="" method="post">
<input type="hidden" name="currentPage" value="<%=resultBean.getCurrentPage() - 1
%>">
<input type="submit" name="g" value="上一页">
</form>
</td>
<td><form action="" method="post">
<input type="hidden" name="currentPage"
value="<%=resultBean.getCurrentPage() + 1%>"> <input
type="submit" name="g" value="下一页">
</form></td>
</tr>
<tr>
<td><form action="" method="post">
每页显示<input type="text" name="PageSize" value=1 size=3> 条记录<input
type="submit" name="g" value="确定">
</form></td>
<td><form action="" method="post">
输入页码<input type="text" name="currentPage" size=2> <input
type="submit" name="g" value="提交">
</form></td>
</tr>
</table>
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>Example7_2_Servlet</servlet-name>
<servlet-class>com.servlet.Example7_2_Servlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Example7_2_Servlet</servlet-name>
<url-pattern>/Example7_2_Servlet</url-pattern>
</servlet-mapping>
</web-app>
时间： 2024-10-27 13:29:26