SpringBoot文件上传与下载
文件的上传与下载
在springmvc阶段要实现文件的上传下载,需要的依赖—>>
commons-fileupload
commons-fileupload
1.4
commons-io
commons-io
2.8.0
在springboot中其实自带了一下关于文件上传和下载的依赖
package com.gavin.fileupload;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
public class FileuploadApplication {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(FileuploadApplication.class, args);
String[] beanDefinitionNames = context.getBeanDefinitionNames();
for (String name : beanDefinitionNames) {
System.out.println(name);
}
}
}
运行结果—>>>
org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration
multipartConfigElement
multipartResolver
spring.servlet.multipart-org.springframework.boot.autoconfigure.web.servlet.MultipartProperties
org.springframework.boot.devtools.autoconfigure.LocalDevToolsAutoConfiguration$RestartConfiguration
restartingClassPathChangedEventListener
classPathFileSystemWatcher
classPathRestartStrategy
fileSystemWatcherFactory
所以我们就不需要在引入文件上传组件—multipartResolver
springboot实现文件的上传
1,准备一个服务器,用于存放上传的文件;
修改端口号和修改只读为false;
启动文件服务器
跨服务器上传/下载的依赖
先搭建一个框架—>>
登录页–>
登录页面
欢迎访问学生管理系统
注册页代码
注册页
主页代码
Title
,welcome to here!!
注册成功页
注册成功
,两秒后返回登录页....,如果超时请 手动返回
下载页
Title
| 编号 | 账号 | 密码 | 昵称 | 头像 | 下载 |
|---|
controller层
package com.gavin.controller;
import com.gavin.mapper.UserMapper;
import com.gavin.pojo.User;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.*;
@Controller
public class FileController {
//上传到的文件位置---非本地
private String newFileName = null;
private String fileType = null;
private static ClassPathResource classPathResource = new ClassPathResource("/config/location.properties");
Properties properties = PropertiesLoaderUtils.loadProperties(classPathResource);
String pic_location = properties.getProperty("pic_location");
@Qualifier(value = "sqlSessionFactory")
private SqlSessionFactory sqlSessionFactory;
public FileController() throws IOException {
}
@Autowired
public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
this.sqlSessionFactory = sqlSessionFactory;
}
@RequestMapping("/getAllUser")
@ResponseBody
public List getAllUser() {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List users = mapper.getAllUser();
// 返回一个json对象
return users;
}
@RequestMapping("/")
public String Welcome() {
return "loginPage.html";
}
@PostMapping("/login.do")
public String loginSys(@Param("user") User user, HttpServletRequest request) {
// System.out.println(user);
// 如果没登陆过
//如果user不为空,则查询user是否存在
if (null != user) {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
Integer i = mapper.loginCheck(user);
//如果存在则跳到main页面
if (null != i) {
HttpSession session = request.getSession();
session.setAttribute("user", user);
return "../static/main.html";
}
}
//如果不存在则重定向到
// 登录页
return "redirect:../static/loginPage.html";
}
@RequestMapping("/checkUserName.do")
@ResponseBody
public String checkUser(@RequestBody String name) {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
Integer result = mapper.checkUser(name);
sqlSession.close();
if (null != result) {
return "error:Repeated";
}
return "right:OK";
}
@PostMapping("/addUser.do")
public Object addUser(@Param("user") User user) {
ModelAndView model = new ModelAndView();
System.out.println(user.toString());
if (null != user) {
user.setPicname(newFileName);
user.setFiletype(fileType);
System.out.println(user);
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
int i = mapper.registerUser(user);
sqlSession.close();
if (i == 1) {
model.addObject("msg", "注册成功");
model.setViewName("../static/success.html");
} else {
// 如果用户注册失败(网络原因,其他原因,那么注册的图片还要删除,这里不做处理)
model.addObject("msg", "注册失败");
model.setViewName("../static/registPage.html");
}
}
return model;
}
@RequestMapping("/fileUpload2.do")
@ResponseBody
public Map upDataPicture(MultipartFile headerPicture, HttpServletRequest request) throws IOException {
Map map = new HashMap<>(1);
// 如果文件不存在
if (headerPicture == null) {
map.put("msg", "请上传图片!");
return map;
}
//有文件,则获取文件名
String originalFilename = headerPicture.getOriginalFilename();
// 控制文件的大小
Integer size = 1024 * 1024 * 10;
if (headerPicture.getSize() > size) {
map.put("msg", "文件大小不超过10M");
return map;
}
// 避免名字冲突,用UUID替换文件名,但是扩展名不变
String uuid = UUID.randomUUID().toString();
// 获取拓展名,只支持jpg与png
String[] exName = {".jpg", ".png"};
String extendsName = originalFilename.substring(originalFilename.lastIndexOf("."));
if (!(exName[0].equals(extendsName) || exName[1].equals(extendsName))) {
map.put("msg", "文件类型不符合要求");
return map;
}
//拼接成新名字
newFileName = uuid.concat(extendsName);
System.out.println(newFileName);
//创建 jersey 包中的client对象,用于跨服务器请求
Client client = Client.create();
System.out.println(client);
WebResource resource = client.resource(pic_location + newFileName);
String result = resource.put(String.class, headerPicture.getBytes());
System.out.println(result);
map.put("msg", "文件上传成功");
// 返回新生成的文件名
map.put("newFileName", pic_location + newFileName);
fileType = headerPicture.getContentType();
map.put("fileType", fileType);
return map;
}
@RequestMapping("/showUser.do")
public String showUser() {
return "../static/picDown.html";
}
@RequestMapping("/fileDownload.do")
public void fileDownLoad(String picname, String fileType, HttpServletResponse resp) throws IOException {
//设置响应头
// 这里如果传过来id则还要到数据库查,不如直接穿过来文件名
// 解析文件名----数据库里没有直接存文件格式,所以要在这里解析文件格式,但是这列格式并非前端识别的格式,所以还是修改之前的在用户表上添加前端文件格式
// 保存数据到磁盘上,不在浏览器上直接解析
resp.setHeader("Content-Disposition", "attachment;filename=" + picname);
resp.setContentType(fileType);
// 获取一个文件输入流
InputStream inputStream = new URL(pic_location + picname).openStream();
// 浏览器获得输出文件
ServletOutputStream outputStream = resp.getOutputStream();
IOUtils.copy(inputStream, outputStream);
}
}
简单的测试一下
登陆成功界面
注册成功界面
下载页面
