《JavaWeb---简单应用---练习JDBC，JSTL》---上传Excel文件，利用工具包解析，将数据储存到数据库中，可以查询删除
2012-10-27 23:10
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>上传查看表格</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">
-->
<style type="text/css">
body{
text-align: center;
}
table,td{
height: 30px;
text-align: center;
border: 1px green solid;
border-collapse: collapse;
}
</style>
</head>
<body>
<table>
<tr style="color: red">
<td>说明</td>
<td>操作</td>
</tr>
<tr>
<td> 查看数据库中的数据</td>
<td>
<a href="${pageContext.request.contextPath }/servlet/Read" >查看</a>
</td>
</tr>
<tr>
<td> 管理数据库中的数据</td>
<td>
<a href="${pageContext.request.contextPath }/servlet/Control" >管理</a>
</td>
</tr>
<tr>
<form action="${pageContext.request.contextPath }/servlet/Receive" enctype="multipart/form-data" method="post">
<td>
<input type="file" name="filexls"/><br/>
</td>
<td>
<input type="submit" value="上传"/>
</td>
</form>
</tr>
</table>
</body>
</html>package com.strong.upload.receive;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import com.strong.upload.dao.DaoUtils;
import com.strong.upload.javabean.User;
public class Receive extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//设置编码
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart){
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List<FileItem> items = null;
try {
//转换请求数据
items = upload.parseRequest(request);
} catch (FileUploadException e) {
throw new RuntimeException("转换请求失败！");
}
//遍历请求
Iterator iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (!item.isFormField()) {
//判断是上传文件，并且是指定上传框内的文件
if (item.getContentType().equals("application/vnd.ms-excel")){
if (item.getFieldName().equals("filexls")){
ArrayList<User> users = sava2Bean(item);
request.setAttribute("users", users);
DaoUtils.createUsers(users);//将数据储存到数据库中
//DaoUtils.readUsers();
}else{
System.out.println("文件名不正确");
}
}
}
}
}
request.setAttribute("type", "0");
request.getRequestDispatcher("/WEB-INF/jsp/showusers.jsp").forward(request, response);
}
public ArrayList<User> sava2Bean(FileItem item){
HSSFWorkbook hwb = null;
try {
//得到上传的文件
hwb = new HSSFWorkbook(item.getInputStream());
} catch (Exception e) {
throw new RuntimeException("获取文件失败！");
}
//获取一个表
HSSFSheet sheet = hwb.getSheetAt(0);
//创建储存数据的集合
ArrayList<User> users = new ArrayList<User>();
//解析表中的数据，并将数据封装
for (int i = 1; i <= sheet.getLastRowNum(); i++){
HSSFRow row = sheet.getRow(i);
//暂时储存一行数据
ArrayList<String> data = new ArrayList<String>();
for (int j = 0; j < row.getLastCellNum(); j++){
HSSFCell cell = row.getCell(j);
cell.setCellType(Cell.CELL_TYPE_STRING);
data.add(cell.toString());
}
users.add(new User(data.get(0),data.get(1),data.get(2),data.get(3),data.get(4)));
data.clear();
}
//以文件的形式保存到硬盘上
String fallname = item.getName();
String filename = fallname.substring(fallname.lastIndexOf("\\")+1, fallname.lastIndexOf("."));
try {
hwb.write(new FileOutputStream(new File("c:\\"+filename+"_upload.xls")));
} catch (Exception e) {
throw new RuntimeException("保存文件失败！");
}
return users;
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}package com.strong.upload.dao;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import com.strong.upload.javabean.User;
/*
create table users(
id varchar(32) not null,
name varchar(32) not null,
age varchar(32) not null,
phone varchar(32) not null,
email varchar(32) not null
);
*/
public class DaoUtils {
static Connection conn = null;
static Statement st = null;
static {
//建立连接
conn = JdbcUtils.getConnection();
//创建语句
try {
st = conn.createStatement();
} catch (SQLException e) {
throw new RuntimeException("创建语句失败！");
}
}
public static void createUsers(ArrayList<User> users){
if (conn != null && st != null){
for (int i = 0; i < users.size(); i++){
User user = users.get(i);
String sql = "insert into users(id,name,age,phone,email) values('"+
user.getId()+"','"+user.getName()+"','"+user.getAge()+"','"+user.getPhone()+"','"+user.getEmail()+"')";
try {
st.executeUpdate(sql);
} catch (SQLException e) {
throw new RuntimeException("更新数据失败！");
}
}
}
}
public static ArrayList<User> readUsers(){
ArrayList<User> users = new ArrayList<User>();
if (conn != null && st != null){
String sql = "select * from users";
try {
ResultSet rs = st.executeQuery(sql);
while(rs.next()){
String id = (String) rs.getObject("id");
String name = (String) rs.getObject("name");
String age = (String) rs.getObject("age");
String phone = (String) rs.getObject("phone");
String email = (String) rs.getObject("email");
users.add(new User(id, name, age, phone, email));
}
} catch (SQLException e) {
throw new RuntimeException("查询失败！");
}
}
return users;
}
public static void deleteUser(String id){
if (conn != null && st != null){
String sql = "delete from users where id="+id;
try {
st.executeUpdate(sql);
} catch (SQLException e) {
throw new RuntimeException("删除失败！");
}
}
}
}<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<c:if test="${requestScope.type == 0}" var="condition" scope="request">
<meta http-equiv="Refresh" content="3;url=${pageContext.request.contextPath }"/>
</c:if>
<title>显示信息</title>
<meta http-equiv="description" content="this is my page"/>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath }/css/showusers.css"/>
</head>
<body>
<c:if test="${requestScope.type == 0}" var="condition" scope="request">
<h1>上传成功</h1>
3秒后未跳转，<a href="${pageContext.request.contextPath }">点击这里...</a>
</c:if>
<c:if test="${requestScope.type == 1}" var="condition" scope="request">
<h1>数据库中的信息</h1>
</c:if>
<c:if test="${requestScope.type == 2}" var="condition" scope="request">
<h1>管理信息</h1>
</c:if>
<c:if test="${requestScope.control == 'delete'}" var="condition" scope="request">
<font color="red">删除成功！</font>
</c:if>
<table border="1" width="50%" >
<tr style="background-color: #00FF00;">
<td>id</td><td>name</td><td>age</td><td>phone</td><td>email</td><c:if test="${requestScope.type == 2}" var="condition" scope="request"><td>control</td></c:if>
</tr>
<c:forEach var="user" items="${users }" varStatus="i">
<tr class="${i.count%2==0? 'even':'odd' }">
<td>${user.id }</td>
<td>${user.name }</td>
<td>${user.age }</td>
<td>${user.phone }</td>
<td>${user.email }</td>
<c:if test="${requestScope.type == 2}" var="condition" scope="request"><td>
<a href="${pageContext.request.contextPath }/servlet/Delete?id='${user.id }'">删除</a></td>
</c:if>
</tr>
</c:forEach>
</table>
<c:if test="${requestScope.type == 1 || requestScope.type == 2}" var="condition" scope="request">
<a href="${pageContext.request.contextPath }">返回</a>
</c:if>
</body>
</html>
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