新建io.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/testup/uploadBatchFile.do" method="post" enctype="multipart/form-data">
<input type="file" name="files">
<input type="file" name="files">
<button type="submit">上传</button>
</form>
<form action="${pageContext.request.contextPath}/download.do" method="post">
<input name="files" value="SAP接口说明V2.0(1).xlsx">
<button type="submit">下载</button>
</form>
</body>
</html>
//文件上传控制类 UploadController
package com.zjn.IO;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
@Controller
@RequestMapping("/testup")
public class UploadController {
/**
* 9.②多个文件上传
*/
@RequestMapping(value="/uploadBatchFile",method=RequestMethod.POST,consumes="multipart/form-data")
public String uploadBatchFile(@RequestParam MultipartFile[] files,RedirectAttributes redirectAttributes){
boolean isEmpty=true;
try {
for (MultipartFile multipartFile : files) {
if(multipartFile.isEmpty()){
continue;
}
String time=new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
String fileName=multipartFile.getOriginalFilename();
String destFileName="D:\\whupload"+File.separator+time+"_"+fileName;
File destFile=new File(destFileName);
multipartFile.transferTo(destFile);
isEmpty=false;
}
//int i=1/0;
//localhost:8086/test/index?message=upload file success
//redirectAttributes.addAttribute("message","upload file success."); } catch (Exception e) {
// TODO Auto-generated catch block
redirectAttributes.addFlashAttribute("message", "文件上传失败");
System.out.println(e.getMessage());
return "redirect:message.do";
}
if(isEmpty){
redirectAttributes.addFlashAttribute("message", "上传文件为空");
}else{
redirectAttributes.addFlashAttribute("message", "文件上传成功");
}
return "redirect:message.do";
}
@RequestMapping("/message")
public String message() {
return "message";
}
/**
* @Method: makeFileName
* @Description: 生成上传文件的文件名，文件名以：uuid+"_"+文件的原始名称
* @param filename 文件的原始名称
* @return uuid+"_"+文件的原始名称
*/
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;
} }
//文件下载控制类 DownController
package com.zjn.IO;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class DownController {
@RequestMapping(value = "/download")
public String download(HttpServletResponse response, Model model,String files) throws Exception {
System.out.println("进入文件下载》》》》》》》》》》》》》》》》》》files==="+files);
files = new String(files.getBytes("iso8859-1"),"UTF-8");//将iso8859-1编码换成utf-8
System.out.println("转码后files===="+files);
//通过文件名找出文件的所在目录
String URL = "D:\\whupload\\"+files;
//得到要下载的文件
File file = new File(URL);
//如果文件不存在
if(!file.exists()){
//如果文件不存在，进行处理
int i=1/0;//系统会报错，除数不能为0.
// return "modules/cms/front/themes/"+site.getTheme()+"/frontError";
}
InputStream inputStream = null;
OutputStream outputStream = null;
//创建缓冲区
byte[] b= new byte[1024];
int len = 0;
try {
//读取要下载的文件，保存到文件输入流
inputStream = new FileInputStream(file);
outputStream = response.getOutputStream();
response.setContentType("application/force-download");
String filename = file.getName();
//设置响应头，控制浏览器下载该文件
response.addHeader("Content-Disposition","attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
response.setContentLength( (int) file.length( ) );
//循环将输入流中的内容读取到缓冲区当中
while((len = inputStream.read(b)) != -1){
//输出缓冲区的内容到浏览器，实现文件下载
outputStream.write(b, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
}finally{
if(inputStream != null){
try {
inputStream.close();
inputStream = null;
} catch (IOException e) {
e.printStackTrace();
}
}
if(outputStream != null){
try {
outputStream.close();
outputStream = null;
} catch (IOException e) {
e.printStackTrace();
}
}
} return null;
}
}