controller
package com.example.file.controller;
import com.example.file.utils.FileUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
@RestController
@RequestMapping("/file")
public class FileController {
@Autowired
private FileUtil fileUtil;
@GetMapping("/spring/download")
public ResponseEntity<Resource> download() throws Exception {
String filePath = "D:\\1.jpg";
String fileName = "Spring框架下载.jpg";
return fileUtil.download(filePath,fileName);
}
@GetMapping("/io/download")
public void ioDownload(HttpServletResponse response) throws Exception {
String filePath = "D:\\1.jpg";
String fileName = "IO下载.jpg";
fileUtil.download(filePath,fileName,response);
}
@GetMapping("/tiny/download")
public void tinyDownload(HttpServletResponse response) throws Exception {
String filePath = "D:\\1.jpg";
String fileName = "tiny下载.jpg";
fileUtil.downloadTinyFile(filePath,fileName,response);
}
@PostMapping("/multipart/upload")
public String download(MultipartFile file) throws Exception {
String storagePath = "D:\\";
return fileUtil.upload(file,storagePath);
}
}
FileUtil
package com.example.file.utils;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.UUID;
/**
* 文件工具类
* @author HTT
*/
@Component
public class FileUtil {
/**
* 使用Spring框架自带的下载方式
* @param filePath
* @param fileName
* @return
*/
public ResponseEntity<Resource> download(String filePath,String fileName) throws Exception {
fileName = URLEncoder.encode(fileName,"UTF-8");
File file = new File(filePath);
if(!file.exists()){
throw new Exception("文件不存在");
}
return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,
"attachment; filename=" + fileName ).body(new FileSystemResource(filePath));
}
/**
* 通过IOUtils以流的形式下载
* @param filePath
* @param fileName
* @param response
*/
public void download(String filePath , String fileName, HttpServletResponse response) throws Exception {
fileName = URLEncoder.encode(fileName,"UTF-8");
File file=new File(filePath);
if(!file.exists()){
throw new Exception("文件不存在");
}
response.setHeader("Content-disposition","attachment;filename="+ fileName);
FileInputStream fileInputStream = new FileInputStream(file);
IOUtils.copy(fileInputStream,response.getOutputStream());
response.flushBuffer();
fileInputStream.close();
}
/**
* 原始的方法，下载一些小文件，边读边下载的
* @param filePath
* @param fileName
* @param response
* @throws Exception
*/
public void downloadTinyFile(String filePath,String fileName, HttpServletResponse response)throws Exception{
File file = new File(filePath);
fileName = URLEncoder.encode(fileName, "UTF-8");
if(!file.exists()){
throw new Exception("文件不存在");
}
FileInputStream in = new FileInputStream(file);
response.setHeader("Content-Disposition", "attachment;filename="+fileName);
OutputStream out = response.getOutputStream();
byte[] b = new byte[1024];
int len = 0;
while((len = in.read(b))!=-1){
out.write(b, 0, len);
}
out.flush();
out.close();
in.close();
}
/**
* 上传文件
* @param multipartFile
* @param storagePath
* @return
* @throws Exception
*/
public String upload(MultipartFile multipartFile, String storagePath) throws Exception{
if (multipartFile.isEmpty()) {
throw new Exception("文件不能为空！");
}
String originalFilename = multipartFile.getOriginalFilename();
String newFileName = UUID.randomUUID()+"_"+originalFilename;
String filePath = storagePath+newFileName;
File file = new File(filePath);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
multipartFile.transferTo(file);
return filePath;
}
}
package com.example.file.test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
public class DownLoadFile {
/**
* @param path 想要下载的文件的路径
* @param response
* @功能描述 下载文件:
*/
@RequestMapping("/download")
public void download(String path, HttpServletResponse response) throws FileNotFoundException {
Logger log = LoggerFactory.getLogger(DownLoadFile.class);
try {
// path是指想要下载的文件的路径
File file = new File(path);
log.info(file.getPath());
// 获取文件名
String filename = file.getName();
// 获取文件后缀名
String ext = filename.substring(filename.lastIndexOf(".") + 1).toLowerCase();
log.info("文件后缀名：" + ext);
// 将文件写入输入流
FileInputStream fileInputStream = new FileInputStream(file);
InputStream fis = new BufferedInputStream(fileInputStream);
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 设置response的Header
response.setCharacterEncoding("UTF-8");
//Content-Disposition的作用：告知浏览器以何种方式显示响应返回的文件，用浏览器打开还是以附件的形式下载到本地保存
//attachment表示以附件方式下载 inline表示在线打开 "Content-Disposition: inline; filename=文件名.mp3"
// filename表示文件的默认名称，因为网络传输只支持URL编码的相关支付，因此需要将文件名URL编码后进行传输,前端收到后需要反编码才能获取到真正的名称
response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
// 告知浏览器文件的大小
response.addHeader("Content-Length", "" + file.length());
OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
outputStream.write(buffer);
outputStream.flush();
} catch (IOException ex) {
ex.printStackTrace();
}
}
/**
* @param path 指想要下载的文件的路径
* @param response
* @功能描述 下载文件:将输入流中的数据循环写入到响应输出流中，而不是一次性读取到内存
*/
@RequestMapping("/downloadLocal")
public void downloadLocal(String path, HttpServletResponse response) throws IOException {
// 读到流中
InputStream inputStream = new FileInputStream(path);// 文件的存放路径
response.reset();
response.setContentType("application/octet-stream");
String filename = new File(path).getName();
response.addHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
ServletOutputStream outputStream = response.getOutputStream();
byte[] b = new byte[1024];
int len;
//从输入流中读取一定数量的字节，并将其存储在缓冲区字节数组中，读到末尾返回-1
while ((len = inputStream.read(b)) > 0) {
outputStream.write(b, 0, len);
}
inputStream.close();
}
/**
* @param path 下载后的文件路径和名称
* @param netAddress 文件所在网络地址
* @功能描述 网络文件下载到服务器本地
*/
@RequestMapping("/netDownloadLocal")
public void downloadNet(String netAddress, String path) throws IOException {
URL url = new URL(netAddress);
URLConnection conn = url.openConnection();
InputStream inputStream = conn.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream(path);
int bytesum = 0;
int byteread;
byte[] buffer = new byte[1024];
while ((byteread = inputStream.read(buffer)) != -1) {
bytesum += byteread;
System.out.println(bytesum);
fileOutputStream.write(buffer, 0, byteread);
}
fileOutputStream.close();
}
/**
* @param netAddress
* @param filename
* @param isOnLine
* @param response
* @功能描述 网络文件获取到服务器后，经服务器处理后响应给前端
*/
@RequestMapping("/netDownLoadNet")
public void netDownLoadNet(String netAddress, String filename, boolean isOnLine, HttpServletResponse response) throws Exception {
URL url = new URL(netAddress);
URLConnection conn = url.openConnection();
InputStream inputStream = conn.getInputStream();
response.reset();
response.setContentType(conn.getContentType());
if (isOnLine) {
// 在线打开方式 文件名应该编码成UTF-8
response.setHeader("Content-Disposition", "inline; filename=" + URLEncoder.encode(filename, "UTF-8"));
} else {
//纯下载方式 文件名应该编码成UTF-8
response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
}
byte[] buffer = new byte[1024];
int len;
OutputStream outputStream = response.getOutputStream();
while ((len = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, len);
}
inputStream.close();
}
}
标签：文件,String,上传下载,fileName,file,import,new,response From： https://www.cnblogs.com/ixtao/p/17660441.html