首先准备好几个架包如图所示：
反射辅助类：
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author think
*/
public class BaseServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public BaseServlet() {
super();
}
@Override
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
@Override
protected void service(HttpServletRequest request,HttpServletResponse response){
try {
request.setCharacterEncoding("utf-8");
Class clazz=this.getClass();
String opr= request.getParameter("opr");
if(opr==null){
opr="list";
}
Method me= clazz.getMethod(opr,
HttpServletRequest.class,
HttpServletResponse.class);
me.invoke(this,request, response);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
@Override
public void init() throws ServletException {
// Put your code here
}
}
具体的输出类，实现对文件的上传之后，获取上传的路径，再把路径传递到show方法里面显示输出Excel表格的数据：
package servlet;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
/**
* @author think
*/
@WebServlet(name = "UpdFile", urlPatterns = "/UpdFile")
public class UpdFile extends BaseServlet {
public void getParam(HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setCharacterEncoding("utf-8");
request.setCharacterEncoding("utf-8");
//上传文件
//一般都会保存到项目里面去
String path = this.getServletContext().getRealPath("/WEB-INF/upload");
// 相对路径
// 判断上传的路径目录是否存在
File file = new File(path);
if (!file.exists() && !file.isDirectory()) {
// 如果目录不存在，则创建 //是否是文件夹
System.out.println("创建路径");
file.mkdir();
}
// 1.创建一个处理文件上传的工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
// 2.创建一个文件解析工具
ServletFileUpload upload = new ServletFileUpload(factory);
// 解决中文乱码
// 设置头部信息
upload.setHeaderEncoding("UTF-8");
// 3.判断提交上来的数据是否是长传的表单数据
// 通过jar判断请求的request对象 是否为上传表单
if (!ServletFileUpload.isMultipartContent(request)) {
// 如果是普通上传，则在这里处理
return;// 如果不是，则直接return
}
// 4.使用文件工具对象 解析表单 使用工具解析上传的所有数据
Map<String, String> map = new HashMap<String, String>();
try {
List<FileItem> list = upload.parseRequest(request);
// 把整个表单里面的数据解析 然后封装成FileItem
// 然后保存到list
// 把整个表单里面的数据解析 然后封装成一个集合
// 遍历整个集合
for (FileItem item : list) {
// 区分是普通输入框 还是文件框
// 普通
if (item.isFormField()) {
map.put(item.getFieldName(), item.getString("UTF-8"));
} else {
// 得到文件名
String fileName = item.getName();
if (fileName != "") {
InputStream input = item.getInputStream();
FileOutputStream output = new FileOutputStream(path + "\\" + fileName);
String getPath = path + "\\" + fileName;
//在这里获取到Excel表格的路径
byte[] bytes = new byte[1024];
int i = 0;
while ((i = input.read(bytes)) > 0) {
output.write(bytes, 0, i);
}
input.close();
output.close();
//把路径放到方法里面显示
show(getPath);
}
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
public void show(String path){
System.out.println(path);
String excelFileName =path;
try {
List<String[]> list = readExcel(new File(excelFileName),1);
for (int i = 0; i < list.size(); i++) {
String[] str = (String[])list.get(i);
for (int j = 0; j < str.length; j++) {
System.out.println(str[j]);
}
}
} catch (BiffException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static List<String[]> readExcel(File excelFile, int rowNum) throws BiffException,
IOException {
// 创建一个list 用来存储读取的内容
List<String[]> list = new ArrayList<String[]>();
Workbook rwb = null;
Cell cell = null;
// 创建输入流
InputStream stream = new FileInputStream(excelFile);
// 获取Excel文件对象
rwb = Workbook.getWorkbook(stream);
// 获取文件的指定工作表 默认的第一个
Sheet sheet = rwb.getSheet(0);
// 行数(表头的目录不需要，从1开始)
for (int i = rowNum - 1; i < sheet.getRows(); i++) {
// 创建一个数组 用来存储每一列的值
String[] str = new String[sheet.getColumns()];
// 列数
for (int j = 0; j < sheet.getColumns(); j++) {
// 获取第i行，第j列的值
cell = sheet.getCell(j, i);
str[j] = cell.getContents();
}
// 把刚获取的列存入list
list.add(str);
}
// 返回值集合
return list;
}
}
index.jsp 上传文件的页面：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>上传Excel表格测试</title>
<script src="js/jquery-1.12.4.js"></script>
</head>
<body>
<h3>测试</h3>
<form action="UpdFile?opr=getParam" enctype="multipart/form-data"
method="post">
上传图片:<input type="file" value="选择文件" name="fName" id="userface" ><br>
<input type="submit" value="提交" id="button">
</form>
</body>
在这里需要注意的是上面的解析因为版本的问题只能解析后缀是xls的文件，对xlsx的文件解析会报错！
