上传步骤:
- 1.在jsp中使用
<form action="/StudentInfo/StudentHandler/sc/${sessionScope.sid }" enctype="multipart/form-data" method="post">
<input type="file" name="file" width="120px">
<button type="submit">上传图片</button>
</form>
- 2.编写conteoller:
// 上传图片
@RequestMapping(value = "/sc/{sid}", method = RequestMethod.POST)
public String sc(@PathVariable("sid") String sid, @RequestParam("file") CommonsMultipartFile file, HttpServletRequest request,
Model model) {
//调用工具类的上传方法 返回文件的名称
String upfile = FileUpUtil.upfile(file, request);
System.out.println(upfile+"123");
Student student = new Student();
student.setSid(sid);
student.setClassr(upfile);
///将文件名称存入到数据库中
int i = studentService.modifyStudentkb(student);
}
下载步骤
- 1.jsp
<a href="/StudentInfo/StudentHandler/xz?sid=${exit.sid}&path=${exit.classr}">下载</a>
- 2.编写controller
// 下载图片
@RequestMapping(value = "/xz", method = RequestMethod.GET)
public String xz(String path, String sid, HttpServletRequest request,
HttpServletResponse response, Model model) {
//path前端携带文佳名 调用工具类的下载方法
FileUpUtil.downFile(request,response,path);
}
使用工具类:
package net.fuzui.StudentInfo.utlis;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
public class FileUpUtil {
/**
* 上传多个文件或图片上传在项目路径下的img文件夹在
* ！！！！！！重新部署项目实效,因为文件夹被删除
* @param files
* @param request
* @return
*/
public static List<String> upfiles(CommonsMultipartFile files[], HttpServletRequest request){
List<String> list = new ArrayList<String>();
// 获得项目的路径
ServletContext sc = request.getSession().getServletContext();
// 上传位置
String path = sc.getRealPath("/img") + File.separatorChar; // 设定文件保存的目录
File f = new File(path);
if (!f.exists())
f.mkdirs();
for (int i = 0; i < files.length; i++) {
// 获得原始文件名
String fileName = files[i].getOriginalFilename();
System.out.println("原始文件名:" + fileName);
// 新文件名
String newFileName = UUID.randomUUID() + fileName;
if (!files[i].isEmpty()) {
try {
FileOutputStream fos = new FileOutputStream(path
+ newFileName);
InputStream in = files[i].getInputStream();
int b = 0;
while ((b = in.read()) != -1) {
fos.write(b);
}
fos.close();
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("上传图片到:" + path + newFileName);
list.add("img/"+newFileName);
}
return list;
}
/**
* 上传一个文件或图片
* 上传多个文件或图片上传在项目路径下的img文件夹在
* ！！！！！！重新部署项目实效,因为文件夹被删除
* @param file
* @param request
* @return
*/
public static String upfile(CommonsMultipartFile file,HttpServletRequest request){
// 获得部署在服务器硬盘上的绝对路径
ServletContext sc = request.getSession().getServletContext();
// 上传位置
String path = sc.getRealPath("/img") + File.separatorChar; // 设定文件保存的目录
File f = new File(path);
if (!f.exists())
f.mkdirs();
// 获得原始文件名(上传的文件名称)
String fileName = file.getOriginalFilename();
System.out.println("原始文件名:" + fileName);
// 新文件名(拼接uuid 全球唯一id 怕图片文件名冲突)
String newFileName = UUID.randomUUID() + fileName;
if (!file.isEmpty()) {
try {
FileOutputStream fos = new FileOutputStream(path
+ newFileName);
InputStream in = file.getInputStream();
int b = 0;
while ((b = in.read()) != -1) {
fos.write(b);
}
fos.close();
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("上传图片到:" + path + newFileName);
return "img/"+newFileName;
}
/**
* 下载
* @param request
* @param response
* @param filename
* @return
*/
public static void downFile(HttpServletRequest request,
HttpServletResponse response, String filename) {
// 得到要下载的文件名
String fileName = filename.substring(4);
try {
fileName = new String(fileName.getBytes("iso8859-1"), "UTF-8");
// 获取上传文件的目录
ServletContext sc = request.getSession().getServletContext();
// 上传位置
String fileSaveRootPath = sc.getRealPath("/img");
System.out.println(fileSaveRootPath + "\\" + fileName);
// 得到要下载的文件
File file = new File(fileSaveRootPath + "\\" + fileName);
// 如果文件不存在
if (!file.exists()) {
request.setAttribute("message", "您要下载的资源已被删除！！");
System.out.println("您要下载的资源已被删除！！");
return ;
}
// 处理文件名
String realname = fileName.substring(fileName.indexOf("_") + 1);
// 设置响应头，控制浏览器下载该文件
response.setHeader("content-disposition", "attachment;filename="
+ URLEncoder.encode(realname, "UTF-8"));
// 读取要下载的文件，保存到文件输入流
FileInputStream in = new FileInputStream(fileSaveRootPath + "\\" + fileName);
// 创建输出流
OutputStream out = response.getOutputStream();
// 创建缓冲区
byte buffer[] = new byte[1024];
int len = 0;
// 循环将输入流中的内容读取到缓冲区当中
while ((len = in.read(buffer)) > 0) {
// 输出缓冲区的内容到浏览器，实现文件下载
out.write(buffer, 0, len);
}
// 关闭文件输入流
in.close();
// 关闭输出流
out.close();
} catch (Exception e) {
}
}
}
