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 {@Autowiredprivate 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 {@Autowiredprivate 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: 2023/9/9Time: 14:20To 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 {@Autowiredprivate 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