上傳步驟:
- 1.在jsp中使用
<form action="/StudentInfo/StudentHandler/sc/${sessionScope.sid }" enctype="multipart/form-data" method="post">
<input type="file" name="file" width="120px">
<button type="submit">上傳圖片</button>
</form>
- 2.編寫(xiě)conteoller:
// 上傳圖片
@RequestMapping(value = "/sc/{sid}", method = RequestMethod.POST)
public String sc(@PathVariable("sid") String sid, @RequestParam("file") CommonsMultipartFile file, HttpServletRequest request,
Model model) {
//調(diào)用工具類的上傳方法 返回文件的名稱
String upfile = FileUpUtil.upfile(file, request);
System.out.println(upfile+"123");
Student student = new Student();
student.setSid(sid);
student.setClassr(upfile);
///將文件名稱存入到數(shù)據(jù)庫(kù)中
int i = studentService.modifyStudentkb(student);
}
下載步驟
- 1.jsp
<a href="/StudentInfo/StudentHandler/xz?sid=${exit.sid}&path=${exit.classr}">下載</a>
- 2.編寫(xiě)controller
// 下載圖片
@RequestMapping(value = "/xz", method = RequestMethod.GET)
public String xz(String path, String sid, HttpServletRequest request,
HttpServletResponse response, Model model) {
//path前端攜帶文佳名 調(diào)用工具類的下載方法
FileUpUtil.downFile(request,response,path);
}
使用工具類:
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 {
/**
* 上傳多個(gè)文件或圖片上傳在項(xiàng)目路徑下的img文件夾在
* Ａ穸肌４砝馈２└觥；隼帷！台夺！重新部署項(xiàng)目實(shí)效,因?yàn)槲募A被刪除
* @param files
* @param request
* @return
*/
public static List<String> upfiles(CommonsMultipartFile files[], HttpServletRequest request){
List<String> list = new ArrayList<String>();
// 獲得項(xiàng)目的路徑
ServletContext sc = request.getSession().getServletContext();
// 上傳位置
String path = sc.getRealPath("/img") + File.separatorChar; // 設(shè)定文件保存的目錄
File f = new File(path);
if (!f.exists())
f.mkdirs();
for (int i = 0; i < files.length; i++) {
// 獲得原始文件名
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("上傳圖片到:" + path + newFileName);
list.add("img/"+newFileName);
}
return list;
}
/**
* 上傳一個(gè)文件或圖片
* 上傳多個(gè)文件或圖片上傳在項(xiàng)目路徑下的img文件夾在
* Ｄ乖臁Ｃ角！Ｒ雅АＩ郝ァ！重新部署項(xiàng)目實(shí)效,因?yàn)槲募A被刪除
* @param file
* @param request
* @return
*/
public static String upfile(CommonsMultipartFile file,HttpServletRequest request){
// 獲得部署在服務(wù)器硬盤(pán)上的絕對(duì)路徑
ServletContext sc = request.getSession().getServletContext();
// 上傳位置
String path = sc.getRealPath("/img") + File.separatorChar; // 設(shè)定文件保存的目錄
File f = new File(path);
if (!f.exists())
f.mkdirs();
// 獲得原始文件名(上傳的文件名稱)
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 怕圖片文件名沖突)
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("上傳圖片到:" + path + newFileName);
return "img/"+newFileName;
}
/**
* 下載
* @param request
* @param response
* @param filename
* @return
*/
public static void downFile(HttpServletRequest request,
HttpServletResponse response, String filename) {
// 得到要下載的文件名
String fileName = filename.substring(4);
try {
fileName = new String(fileName.getBytes("iso8859-1"), "UTF-8");
// 獲取上傳文件的目錄
ServletContext sc = request.getSession().getServletContext();
// 上傳位置
String fileSaveRootPath = sc.getRealPath("/img");
System.out.println(fileSaveRootPath + "\\" + fileName);
// 得到要下載的文件
File file = new File(fileSaveRootPath + "\\" + fileName);
// 如果文件不存在
if (!file.exists()) {
request.setAttribute("message", "您要下載的資源已被刪除６纫骸厕宗！");
System.out.println("您要下載的資源已被刪除；唷！");
return ;
}
// 處理文件名
String realname = fileName.substring(fileName.indexOf("_") + 1);
// 設(shè)置響應(yīng)頭媳瞪，控制瀏覽器下載該文件
response.setHeader("content-disposition", "attachment;filename="
+ URLEncoder.encode(realname, "UTF-8"));
// 讀取要下載的文件骗炉，保存到文件輸入流
FileInputStream in = new FileInputStream(fileSaveRootPath + "\\" + fileName);
// 創(chuàng)建輸出流
OutputStream out = response.getOutputStream();
// 創(chuàng)建緩沖區(qū)
byte buffer[] = new byte[1024];
int len = 0;
// 循環(huán)將輸入流中的內(nèi)容讀取到緩沖區(qū)當(dāng)中
while ((len = in.read(buffer)) > 0) {
// 輸出緩沖區(qū)的內(nèi)容到瀏覽器，實(shí)現(xiàn)文件下載
out.write(buffer, 0, len);
}
// 關(guān)閉文件輸入流
in.close();
// 關(guān)閉輸出流
out.close();
} catch (Exception e) {
}
}
}
