JSP
1 <%--
2 Created by IntelliJ IDEA.
3 User: Ghh
4 Date: 2019/9/1
5 Time: 14:27
6 To change this template use File | Settings | File Templates.
7 --%>
8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
9 <html>
10 <head>
11 <title>文件上传</title>
12 </head>
13 <body>
14 <form action="${pageContext.request.contextPath}/uploadServlet" method="post" enctype="multipart/form-data">
15 <input type="file" name="image" id="image"><br>
16 <input type="submit" value="上传">
17 </form>
18 </body>
19 </html>
Servlet
package com.ghh.upload;
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 javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.util.List;
import java.util.UUID;
/**
* @author Ghh
* @date 2019/9/1 14:32
* @Description
*/
@WebServlet(name = "UploadServlet",urlPatterns = {"/uploadServlet"})
public class UploadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
InputStream is = null;
FileOutputStream fileOutputStream = null;
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if(!isMultipart){
throw new RuntimeException("该请求不支持文件上传");
}
DiskFileItemFactory itemFactory = new DiskFileItemFactory();
//设置上传文件大于3M会启动临时文件目录
itemFactory.setSizeThreshold(1024*1024*3);
//指定临时文件存储目录
String tempPath = this.getServletContext().getRealPath("/temp");
System.out.println("tempPath = " + tempPath);
File temp = new File(tempPath);
if(!temp.exists()){
temp.mkdirs();
}
itemFactory.setRepository(temp);
ServletFileUpload servletFileUpload = new ServletFileUpload(itemFactory);
try {
List<FileItem> fileItems = servletFileUpload.parseRequest(request);
for (FileItem fileItem : fileItems) {
if(fileItem.isFormField()){
//普通字段
String fieldName = fileItem.getFieldName();
String fileValue = fileItem.getString("UTF-8");
System.out.println(fieldName+"===="+fileValue);
}else{
String fileName = fileItem.getName();
String suffer = fileName.substring(fileName.lastIndexOf("."));
UUID uuid = UUID.randomUUID();
fileName = uuid+suffer;
System.out.println("fileName = " + fileName);
//获取输入流
is = fileItem.getInputStream();
//创建输出流
String path = this.getServletContext().getRealPath("/upload");
//根据年月日创建多级目录
LocalDate now = LocalDate.now();
int year = now.getYear();
int month = now.getMonthValue();
int day = now.getDayOfMonth();
path = path+File.separator+year+File.separator+month+File.separator+day;
System.out.println("path = " + path);
//创建父目录
File parentDir = new File(path);
if(!parentDir.exists()){
parentDir.mkdirs();
}
File file = new File(path,fileName);
fileOutputStream = new FileOutputStream(file);
byte[] bytes = new byte[1024];
int len = -1;
while ((len = is.read(bytes))!=-1){
fileOutputStream.write(bytes,0,len);
}
fileItem.delete();
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}finally {
try {
is.close();
fileOutputStream.close();
}catch (Exception e){
e.printStackTrace();
}
}
}
}
