原文章地址：https://blog.csdn.net/meng564764406/article/details/52426634
现在正在做一个将Excel导入进数据库的一个程序，现在已经实现了一种方法，借鉴了很多。下面详细说一下，功能如何实现的。
优化版本：第一次优化
目前这个文章的实现方法：
浏览器端选择Excel文件，点击上传，服务器目录会多出一个Excel的文件，然后再在服务器端读取这个文件，保存到数据库。
由于篇幅有限，csdn的上传在60M内，jar包加起来就超过了、所以在这里留一个百度云的链接，可以直接下载，导入即可运行。
源码最新地址
由于篇幅问题，这里只保存了关键的源代码，详细的源代码可以去百度云下载，若链接过时，可以给我评论，或者给我发邮箱，qq均可（点击我的头像获取）。
一、介绍一下我们的这个程序的流程
软件环境，win7 + IDEA +MySQL+tomcat
测试浏览器：火狐
其他：jQuery+bootstrap+poi
二、首先看一下包的导入，poi3.17jar包-所有jar包 , 引入时如果只引：
则无XSSFWorkbook和SXSSHWorkbook,还需引入：
三、我们对上面的五个文件开始写吧。
DbUtil.java
package com.app.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.app.common.Common;
import com.app.po.Student_1;
public class DbUtil {
/**
* @param sql
*/
public static void insert(String sql, Student_1 student) throws SQLException {
Connection conn = null;
PreparedStatement ps = null;
try {
Class.forName(Common.DRIVER);
conn = DriverManager.getConnection(Common.URL, Common.USERNAME, Common.PASSWORD);
ps = conn.prepareStatement(sql);
ps.setString(1, student.getNo());
ps.setString(2, student.getName());
ps.setString(3, student.getAge());
ps.setString(4, String.valueOf(student.getScore()));
boolean flag = ps.execute();
if(!flag){
System.out.println("Save data : No. = " + student.getNo() + " , Name = " + student.getName() + ", Age = " + student.getAge() + " succeed!");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (ps != null) {
ps.close();
}
if (conn != null) {
conn.close();
}
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public static List selectOne(String sql, Student_1 student) throws SQLException {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
List list = new ArrayList();
try {
Class.forName(Common.DRIVER);
conn = DriverManager.getConnection(Common.URL, Common.USERNAME, Common.PASSWORD);
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
while(rs.next()){
if(rs.getString("no").equals(student.getNo()) || rs.getString("name").equals(student.getName())|| rs.getString("age").equals(student.getAge())){
list.add(1);
}else{
list.add(0);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (rs != null) {
rs.close();
}
if (ps != null) {
ps.close();
}
if (conn != null) {
conn.close();
}
}
return list;
}
public static ResultSet selectAll(String sql) throws SQLException {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
Class.forName(Common.DRIVER);
conn = DriverManager.getConnection(Common.URL, Common.USERNAME, Common.PASSWORD);
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (rs != null) {
rs.close();
}
if (ps != null) {
ps.close();
}
if (conn != null) {
conn.close();
}
}
return rs;
}
}
student.java
package com.app.po;
public class Student_1 {
/**
* id
*/
private Integer id;
/**
* 学号
*/
private String no;
/**
* 姓名
*/
private String name;
/**
* 学院
*/
private String age;
/**
* 成绩
*/
private String score;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getNo() {
return no;
}
public void setNo(String no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
}
common.java
package com.app.common;
public class Common {
// connect the database
public static final String DRIVER = "com.mysql.jdbc.Driver";
public static final String DB_NAME = "test";
public static final String USERNAME = "root";
public static final String PASSWORD = "123456";
public static final String IP = "localhost";
public static final String PORT = "3306";
public static final String URL = "jdbc:mysql://" + IP + ":" + PORT + "/" + DB_NAME;
// common
public static final String EXCEL_PATH = "lib/student_info.xls";
// sql
public static final String INSERT_STUDENT_SQL = "insert into t_student(no, name, age, score) values(?, ?, ?, ?)";
public static final String UPDATE_STUDENT_SQL = "update t_student set no = ?, name = ?, age= ?, score = ? where id = ? ";
public static final String SELECT_STUDENT_ALL_SQL = "select id,no,name,age,score from t_student";
public static final String SELECT_STUDENT_SQL = "select * from t_student where name like ";
}
readExcel.java
package com.app.excel;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
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 com.app.common.Common;
import com.app.po.Student_1;
public class ReadExcel {
public List<Student_1> readXls(String path) throws IOException {
InputStream is = new FileInputStream(path);
HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
Student_1 student = null;
List<Student_1> list = new ArrayList<Student_1>();
// 循环工作表Sheet
for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
if (hssfSheet == null) {
continue;
}
// 循环行Row
for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
HSSFRow hssfRow = hssfSheet.getRow(rowNum);
if (hssfRow != null) {
student = new Student_1();
HSSFCell no = hssfRow.getCell(0);
HSSFCell name = hssfRow.getCell(1);
HSSFCell age = hssfRow.getCell(2);
HSSFCell score = hssfRow.getCell(3);
student.setNo(getValue(no));
student.setName(getValue(name));
student.setAge(getValue(age));
student.setScore(getValue(score));
list.add(student);
}
}
}
return list;
}
@SuppressWarnings("static-access")
private String getValue(HSSFCell hssfCell) {
if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
// 返回布尔类型的值
return String.valueOf(hssfCell.getBooleanCellValue());
} else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
// 返回数值类型的值
return String.valueOf(hssfCell.getNumericCellValue());
} else {
// 返回字符串类型的值
return String.valueOf(hssfCell.getStringCellValue());
}
}
}
saveDB.java
package com.app.excel;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
import com.app.common.Common;
import com.app.util.DbUtil;
import com.app.po.Student_1;
public class SaveData2DB {
@SuppressWarnings({ "rawtypes" })
public void save(String path) throws IOException, SQLException {
ReadExcel xlsMain = new ReadExcel();
Student_1 student = null;
List<Student_1> list = xlsMain.readXls(path);
for (int i = 0; i < list.size(); i++) {
student = list.get(i);
List l = DbUtil.selectOne(Common.SELECT_STUDENT_SQL + "'%" + student.getName() + "%'", student);
if (!l.contains(1)) {
DbUtil.insert(Common.INSERT_STUDENT_SQL, student);
} else {
System.out.println("The Record was Exist : No. = " + student.getNo() + " , Name = " + student.getName() + ", Age = " + student.getAge() + ", and has been throw away!");
}
}
}
}
Upload.java
package com.app.action;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;
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.FileUploadBase;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.adtec.framework.common.util.JsonUtil;
import com.app.excel.SaveData2DB;
import net.sf.json.JSONObject;
public class UpLoad extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private final Logger logger = LoggerFactory.getLogger(this.getClass());
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("coming.......");
//得到上传文件的保存目录，将上传的文件存放于WEB-INF目录下，不允许外界直接访问，保证上传文件的安全
String savePath = this.getServletContext().getRealPath("/WEB-INF/upload");
//上传时生成的临时文件保存目录
String tempPath = this.getServletContext().getRealPath("/WEB-INF/temp");
File tmpFile = new File(tempPath);
if (!tmpFile.exists()) {
//创建临时目录
tmpFile.mkdir();
}
//消息提示
String message = "";
try{
//使用Apache文件上传组件处理文件上传步骤：
//1、创建一个DiskFileItemFactory工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
//设置工厂的缓冲区的大小，当上传的文件大小超过缓冲区的大小时，就会生成一个临时文件存放到指定的临时目录当中。
factory.setSizeThreshold(1024*100);//设置缓冲区的大小为100KB，如果不指定，那么缓冲区的大小默认是10KB
//设置上传时生成的临时文件的保存目录
factory.setRepository(tmpFile);
//2、创建一个文件上传解析器
ServletFileUpload upload = new ServletFileUpload(factory);
//监听文件上传进度
/*upload.setProgressListener(new ProgressListener(){
public void update(long pBytesRead, long pContentLength, int arg2) {
System.out.println("文件大小为：" + pContentLength + ",当前已处理：" + pBytesRead);
}
});*/
//解决上传文件名的中文乱码
upload.setHeaderEncoding("UTF-8");
//3、判断提交上来的数据是否是上传表单的数据
if(!ServletFileUpload.isMultipartContent(request)){
//按照传统方式获取数据
return;
}
//设置上传单个文件的大小的最大值，目前是设置为1024*1024字节，也就是1MB
upload.setFileSizeMax(1024*1024);
//设置上传文件总量的最大值，最大值=同时上传的多个文件的大小的最大值的和，目前设置为10MB
upload.setSizeMax(1024*1024*10);
//
//4、使用ServletFileUpload解析器解析上传数据，解析结果返回的是一个List<FileItem>集合，每一个FileItem对应一个Form表单的输入项
List<FileItem> list = upload.parseRequest(request);
for(FileItem item : list){
//如果fileitem中封装的是普通输入项的数据
if(item.isFormField()){
String name = item.getFieldName();
//解决普通输入项的数据的中文乱码问题
String value = item.getString("UTF-8");
// String value = item.getString("gbk");
//value = new String(value.getBytes("iso8859-1"),"UTF-8");
System.out.println(name + "=" + value);
}else{//如果fileitem中封装的是上传文件
//得到上传的文件名称，
String filename = item.getName();
System.out.println(filename+"..");
if(filename==null || filename.trim().equals("")){
continue;
}
//注意：不同的浏览器提交的文件名是不一样的，有些浏览器提交上来的文件名是带有路径的，如： c:\a\b\1.txt，而有些只是单纯的文件名，如：1.txt
//处理获取到的上传文件的文件名的路径部分，只保留文件名部分
filename = filename.substring(filename.lastIndexOf("\\")+1);
//得到上传文件的扩展名
String fileExtName = filename.substring(filename.lastIndexOf(".")+1);
//如果需要限制上传的文件类型，那么可以通过文件的扩展名来判断上传的文件类型是否合法
System.out.println("上传的文件的扩展名是："+fileExtName);
//获取item中的上传文件的输入流
InputStream in = item.getInputStream();
//得到文件保存的名称
String saveFilename = makeFileName(filename);
//得到文件的保存目录
String realSavePath = makePath(saveFilename, savePath);
//创建一个文件输出流
FileOutputStream out = new FileOutputStream(realSavePath + "\\" + saveFilename);
//创建一个缓冲区
byte buffer[] = new byte[1024];
//判断输入流中的数据是否已经读完的标识
int len = 0;
StringBuffer sb = new StringBuffer();
//循环将输入流读入到缓冲区当中，(len=in.read(buffer))>0就表示in里面还有数据
while((len=in.read(buffer))>0){
//使用FileOutputStream输出流将缓冲区的数据写入到指定的目录(savePath + "\\" + filename)当中
// System.out.println(realSavePath);
// System.out.println();
sb.append(new String(buffer,0,len));
// logger.info(sb.toString());
// System.out.println(sb.toString());
// sb.setLength(0);
out.write(buffer, 0, len);
}
// System.out.println(sb.toString()+"-----");
String ss = sb.toString();
// System.out.println(sb.);
//关闭输入流
in.close();
//关闭输出流
out.close();
//删除处理文件上传时生成的临时文件
//item.delete();
SaveData2DB saveData2DB = new SaveData2DB();
saveData2DB.save(realSavePath + "\\" + saveFilename);
System.out.println("end");
message = "success";
}
}
}catch (FileUploadBase.FileSizeLimitExceededException e) {
e.printStackTrace();
message = "单个文件超出最大值！！！";
/*request.setAttribute("message", "单个文件超出最大值！！！");*/
/* request.getRequestDispatcher("/message.jsp").forward(request, response);*/
return;
}catch (FileUploadBase.SizeLimitExceededException e) {
e.printStackTrace();
message = "上传文件的总的大小超出限制的最大值！！！";
/*request.setAttribute("message", "上传文件的总的大小超出限制的最大值！！！");*/
/*request.getRequestDispatcher("/message.jsp").forward(request, response);*/
return;
}catch (Exception e) {
message= "文件上传失败！";
e.printStackTrace();
}
/*request.setAttribute("message",message);*/
returnResultJson(response,message);
/*request.getRequestDispatcher("/message.jsp").forward(request, response);*/
}
private String makeFileName(String filename){ //2.jpg
//为防止文件覆盖的现象发生，要为上传文件产生一个唯一的文件名
return UUID.randomUUID().toString() + "_" + filename;
}
private String makePath(String filename,String savePath){
//得到文件名的hashCode的值，得到的就是filename这个字符串对象在内存中的地址
int hashcode = filename.hashCode();
int dir1 = hashcode&0xf; //0--15
int dir2 = (hashcode&0xf0)>>4; //0-15
//构造新的保存目录
String dir = savePath + "\\" + dir1 + "\\" + dir2; //upload\2\3 upload\3\5
//File既可以代表文件也可以代表目录
File file = new File(dir);
//如果目录不存在
if(!file.exists()){
//创建目录
file.mkdirs();
}
return dir;
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
private void returnResultJson(HttpServletResponse response,Object obj) {
PrintWriter pw = null;
try {
pw = response.getWriter();
JSONObject resultmessage = JsonUtil.generate(obj);
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json");
response.setHeader("Cache-Control", "no-cache");
pw.write(resultmessage.toString());
} catch (Exception e) {
pw.write("系统异常，请联系管理员");
} finally {
pw.flush();
pw.close();
}
}
}
Web.xml
<servlet>
<servlet-name>Upload</servlet-name>
<servlet-class>com.app.action.UpLoad</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Upload</servlet-name>
<url-pattern>/fileUpload/UploadServlet</url-pattern>
</servlet-mapping>
以上就是配置后台文件
现在配置jsp页面吧(jquery),这样的页面插件很多，可以网上搜索你喜欢的。
<div class="htmleaf-container">
<div class="container kv-main">
<!-- <div class="page-header">
<h2>单张上传 <small></h2>
</div> -->
<!-- <form enctype="multipart/form-data" id="uploadForm" method = "post"> -->
<input id="fileUpload" class="file" type="file" name="fileUpload" multiple data-show-preview="true">
<!-- </form> -->
</div>
</div>
<script>
$("#fileUpload").fileinput({
language : "zh",//设置语言
uploadUrl: "${pageContext.request.contextPath}/fileUpload/UploadServlet",//上传地址
uploadAsync: true,//同步还是异步
showCaption:false,//是否显示标题
showUpload: true,//是否显示上传按钮
browseClass: "btn btn-primary", //按钮样式
allowedFileExtensions : ['jpg', 'png','gif','xls'],//接收的文件后缀
allowedFileTypes: ['image', 'video', 'flash','excel'],//接收的文件类型['image', 'html', 'text', 'video', 'audio', 'flash','object']
maxFileCount: 6,//最大上传文件数限制
overwriteInitial: false,
maxFileSize: 1000,
msgFilesTooMany: "选择上传的文件数量({n}) 超过允许的最大数值{m}！",
previewFileIcon: '<i class="glyphicon glyphicon-file"></i>',
enctype: 'multipart/form-data',
/* allowedPreviewTypes: null, */
previewFileIconSettings: {
'docx': '<i class="glyphicon glyphicon-file"></i>',
'xlsx': '<i class="glyphicon glyphicon-file"></i>',
'pptx': '<i class="glyphicon glyphicon-file"></i>',
'jpg': '<i class="glyphicon glyphicon-picture"></i>',
'pdf': '<i class="glyphicon glyphicon-file"></i>',
'zip': '<i class="glyphicon glyphicon-file"></i>'
}
});
原文链接: https://onlyou.blog.csdn.net//article/details/92123241