SpringMVC之文件上传下载
SpringMVC之文件上传下载
- 一、文件上传
- 二、文件下载
- 三、多文件上传
一、文件上传
配置多功能视图解析器（spring-mvc.xml）：在Spring MVC的配置文件（spring-mvc.xml）中配置多功能视图解析器，以支持文件上传。
添加文件上传页面（upload.jsp）：创建一个名为upload.jsp的JSP页面，用于用户上传文件。
做硬盘网络路径映射：配置服务器的硬盘路径映射到网络路径，确保上传的文件可以被访问和处理。
编写一个处理页面跳转的类：创建一个处理页面跳转的Java类，比如PageController.java或ClazzController.java，用于处理上传文件后的页面跳转逻辑。
package com.niyin.web;
import com.niyin.biz.tyBiz;
import com.niyin.model.ty;
import com.niyin.utils.PageBean;
import com.niyin.utils.PropertiesUtil;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
@Controller
@RequestMapping("/clz")
public class tyController {
@Autowired
private tyBiz tyBiz;
@RequestMapping("/list")
public String list(ty t, HttpServletRequest request){
PageBean pageBeanage=new PageBean();
pageBeanage.setRequest(request);
List<ty> books = tyBiz.selectByPager(t, pageBeanage);
request.setAttribute("lst",books);
request.setAttribute("pageBean",pageBeanage);
return "list";
};
@RequestMapping("/add")
public String add(ty t){
int i = tyBiz.insertSelective(t);
return "redirect:list";
};
@RequestMapping("/del")
public String del(ty t){
tyBiz.deleteByPrimaryKey(t.getTid());
return "redirect:list";
};
@RequestMapping("/edit")
public String edit(ty t){
tyBiz.updateByPrimaryKeySelective(t);
return "redirect:list";
};
@RequestMapping("/preSave")
public String preSave(ty t, Model model) {
if (t!=null&&t.getTid()!=null&&t.getTid()!=0){
ty ts = tyBiz.selectByPrimaryKey(t.getTid());
model.addAttribute("ts",ts);
}
return "edit";
}
@RequestMapping("/upload")
public String upload(ty t,MultipartFile cfile){
try {
String dir= PropertiesUtil.getValue("dir");
String server=PropertiesUtil.getValue("server");
String Filename = cfile.getOriginalFilename();
System.out.println("文件名"+Filename);
System.out.println("文件类别"+cfile.getContentType());
t.setTimage(server+Filename);
tyBiz.updateByPrimaryKeySelective(t);
FileUtils.copyInputStreamToFile(cfile.getInputStream(),new File(dir+Filename));
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:list";
}
@RequestMapping(value="/download")
public ResponseEntity<byte[]> download(ty t,HttpServletRequest req){
try {
//先根据文件id查询对应图片信息
ty ts = this.tyBiz.selectByPrimaryKey(t.getTid());
String diskPath = PropertiesUtil.getValue("dir");
String reqPath = PropertiesUtil.getValue("server");
String realPath = ts.getTimage().replace(reqPath,diskPath);
String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
//下载关键代码
File file=new File(realPath);
HttpHeaders headers = new HttpHeaders();//http头信息
String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
headers.setContentDispositionFormData("attachment", downloadFileName);
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//MediaType:互联网媒介类型 contentType：具体请求中的媒体类型信息
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
}catch (Exception e){
e.printStackTrace();
}
return null;
}
@RequestMapping("/uploads")
public String uploads(HttpServletRequest req, ty t, MultipartFile[] files){
try {
StringBuffer sb = new StringBuffer();
for (MultipartFile cfile : files) {
//思路：
//1) 将上传图片保存到服务器中的指定位置
String dir = PropertiesUtil.getValue("dir");
String server = PropertiesUtil.getValue("server");
String filename = cfile.getOriginalFilename();
FileUtils.copyInputStreamToFile(cfile.getInputStream(),new File(dir+filename));
sb.append(filename).append(",");
}
System.out.println(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return "redirect:list";
}
}
package com.niyin.web;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class PageController {
@RequestMapping("/page/{page}")
public String toPage(@PathVariable("page") String page){
return page;
}
@RequestMapping("/page/{dir}/{page}")
public String toDirPage(@PathVariable("dir") String dir,@PathVariable("page") String page){
return dir + "/"+ page;
}
@RequestMapping("/order/presave")
public String orderpre() {
return "/order/presave";
}
@RequestMapping("/clz/presave")
public String clzerpre() {
return "/clz/presave";
}
}
初步模拟上传文件：实现一个初步的文件上传功能，可以将上传的文件保存到服务器指定的目录。
配置目录的配置文件：创建一个配置文件（比如resource.properties），用于配置上传文件保存的目录。
dir=D:/temp/upload/
server=/upload/
最终实现文件上传并显示：完成文件上传功能的开发，同时可以在页面上显示上传的文件列表或其他相关信息。
二、文件下载
方法代码：编写一个方法代码，用于处理文件下载请求。该方法根据请求参数或文件路径，读取相应的文件，并将文件内容写入HTTP响应流中，实现文件下载。
package com.niyin.web;
import com.niyin.biz.tyBiz;
import com.niyin.model.ty;
import com.niyin.utils.PageBean;
import com.niyin.utils.PropertiesUtil;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
@Controller
@RequestMapping("/clz")
public class tyController {
@Autowired
private tyBiz tyBiz;
@RequestMapping("/list")
public String list(ty t, HttpServletRequest request){
PageBean pageBeanage=new PageBean();
pageBeanage.setRequest(request);
List<ty> books = tyBiz.selectByPager(t, pageBeanage);
request.setAttribute("lst",books);
request.setAttribute("pageBean",pageBeanage);
return "list";
};
@RequestMapping("/add")
public String add(ty t){
int i = tyBiz.insertSelective(t);
return "redirect:list";
};
@RequestMapping("/del")
public String del(ty t){
tyBiz.deleteByPrimaryKey(t.getTid());
return "redirect:list";
};
@RequestMapping("/edit")
public String edit(ty t){
tyBiz.updateByPrimaryKeySelective(t);
return "redirect:list";
};
@RequestMapping("/preSave")
public String preSave(ty t, Model model) {
if (t!=null&&t.getTid()!=null&&t.getTid()!=0){
ty ts = tyBiz.selectByPrimaryKey(t.getTid());
model.addAttribute("ts",ts);
}
return "edit";
}
@RequestMapping("/upload")
public String upload(ty t,MultipartFile cfile){
try {
String dir= PropertiesUtil.getValue("dir");
String server=PropertiesUtil.getValue("server");
String Filename = cfile.getOriginalFilename();
System.out.println("文件名"+Filename);
System.out.println("文件类别"+cfile.getContentType());
t.setTimage(server+Filename);
tyBiz.updateByPrimaryKeySelective(t);
FileUtils.copyInputStreamToFile(cfile.getInputStream(),new File(dir+Filename));
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:list";
}
@RequestMapping(value="/download")
public ResponseEntity<byte[]> download(ty t,HttpServletRequest req){
try {
//先根据文件id查询对应图片信息
ty ts = this.tyBiz.selectByPrimaryKey(t.getTid());
String diskPath = PropertiesUtil.getValue("dir");
String reqPath = PropertiesUtil.getValue("server");
String realPath = ts.getTimage().replace(reqPath,diskPath);
String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
//下载关键代码
File file=new File(realPath);
HttpHeaders headers = new HttpHeaders();//http头信息
String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
headers.setContentDispositionFormData("attachment", downloadFileName);
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//MediaType:互联网媒介类型 contentType：具体请求中的媒体类型信息
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
}catch (Exception e){
e.printStackTrace();
}
return null;
}
@RequestMapping("/uploads")
public String uploads(HttpServletRequest req, ty t, MultipartFile[] files){
try {
StringBuffer sb = new StringBuffer();
for (MultipartFile cfile : files) {
//思路：
//1) 将上传图片保存到服务器中的指定位置
String dir = PropertiesUtil.getValue("dir");
String server = PropertiesUtil.getValue("server");
String filename = cfile.getOriginalFilename();
FileUtils.copyInputStreamToFile(cfile.getInputStream(),new File(dir+filename));
sb.append(filename).append(",");
}
System.out.println(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return "redirect:list";
}
}
JSP页面代码：创建一个JSP页面，用于触发文件下载请求。在该页面中，可以使用超链接或按钮等方式触发文件下载的方法。
<%--
Created by IntelliJ IDEA.
User: 林墨
Date: 2023/9/9
Time: 14:20
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>头像上传title>
head>
<body>
<form action="${ctx}/clz/upload" method="post" enctype="multipart/form-data">
<label>班级编号：label><input type="text" name="tid" readonly="readonly" value="${param.tid}"/><br/>
<label>班级图片：label><input type="file" name="cfile"/><br/>
<input type="submit" value="上传图片"/>
form>
<form method="post" action="${ctx}/clz/uploads" enctype="multipart/form-data">
<input type="file" name="files" multiple>
<button type="submit">上传button>
form>
body>
html>
效果测试：运行应用程序，访问下载页面，并点击下载链接或按钮，验证文件下载功能是否正常工作。
三、多文件上传
jsp页面显示代码：修改上传页面（upload.jsp），支持同时上传多个文件。可以使用HTML的input标签设置multiple属性，以允许选择多个文件。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>博客的编辑界面title>
head>
<body>
<form action="${pageContext.request.contextPath }/clz/${empty ts ? 'add' : 'edit'}" method="post">
id:<input type="text" name="tid" value="${ts.tid }"><br>
bname:<input type="text" name="tname" value="${ts.tname }"><br>
price:<input type="text" name="tprice" value="${ts.tprice }"><br>
price:<input type="text" name="tiamge" value="${ts.timage}"><br>
<input type="submit">
form>
body>
html>
多文件上传方法：修改文件上传处理逻辑，使其能够处理同时上传的多个文件。可以使用循环遍历的方式，依次处理每个上传的文件。
package com.niyin.web;
import com.niyin.biz.tyBiz;
import com.niyin.model.ty;
import com.niyin.utils.PageBean;
import com.niyin.utils.PropertiesUtil;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
@Controller
@RequestMapping("/clz")
public class tyController {
@Autowired
private tyBiz tyBiz;
@RequestMapping("/list")
public String list(ty t, HttpServletRequest request){
PageBean pageBeanage=new PageBean();
pageBeanage.setRequest(request);
List<ty> books = tyBiz.selectByPager(t, pageBeanage);
request.setAttribute("lst",books);
request.setAttribute("pageBean",pageBeanage);
return "list";
};
@RequestMapping("/add")
public String add(ty t){
int i = tyBiz.insertSelective(t);
return "redirect:list";
};
@RequestMapping("/del")
public String del(ty t){
tyBiz.deleteByPrimaryKey(t.getTid());
return "redirect:list";
};
@RequestMapping("/edit")
public String edit(ty t){
tyBiz.updateByPrimaryKeySelective(t);
return "redirect:list";
};
@RequestMapping("/preSave")
public String preSave(ty t, Model model) {
if (t!=null&&t.getTid()!=null&&t.getTid()!=0){
ty ts = tyBiz.selectByPrimaryKey(t.getTid());
model.addAttribute("ts",ts);
}
return "edit";
}
@RequestMapping("/upload")
public String upload(ty t,MultipartFile cfile){
try {
String dir= PropertiesUtil.getValue("dir");
String server=PropertiesUtil.getValue("server");
String Filename = cfile.getOriginalFilename();
System.out.println("文件名"+Filename);
System.out.println("文件类别"+cfile.getContentType());
t.setTimage(server+Filename);
tyBiz.updateByPrimaryKeySelective(t);
FileUtils.copyInputStreamToFile(cfile.getInputStream(),new File(dir+Filename));
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:list";
}
@RequestMapping(value="/download")
public ResponseEntity<byte[]> download(ty t,HttpServletRequest req){
try {
//先根据文件id查询对应图片信息
ty ts = this.tyBiz.selectByPrimaryKey(t.getTid());
String diskPath = PropertiesUtil.getValue("dir");
String reqPath = PropertiesUtil.getValue("server");
String realPath = ts.getTimage().replace(reqPath,diskPath);
String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
//下载关键代码
File file=new File(realPath);
HttpHeaders headers = new HttpHeaders();//http头信息
String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
headers.setContentDispositionFormData("attachment", downloadFileName);
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//MediaType:互联网媒介类型 contentType：具体请求中的媒体类型信息
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
}catch (Exception e){
e.printStackTrace();
}
return null;
}
@RequestMapping("/uploads")
public String uploads(HttpServletRequest req, ty t, MultipartFile[] files){
try {
StringBuffer sb = new StringBuffer();
for (MultipartFile cfile : files) {
//思路：
//1) 将上传图片保存到服务器中的指定位置
String dir = PropertiesUtil.getValue("dir");
String server = PropertiesUtil.getValue("server");
String filename = cfile.getOriginalFilename();
FileUtils.copyInputStreamToFile(cfile.getInputStream(),new File(dir+filename));
sb.append(filename).append(",");
}
System.out.println(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
return "redirect:list";
}
}
测试多文件上传：通过在上传页面选择多个文件并点击上传按钮，测试多文件上传功能是否正常工作。
可以看到已经成功了