springboot实现文件下载
1.新建一个springboot项目
2.pox.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.tuanzi</groupId>
<artifactId>springboot-file-download</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-file-download</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3.controller代码
package com.tuanzi.controller;
import com.tuanzi.utils.CommonUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
@RestController
public class DownloadController {
@RequestMapping("/download")
public String download(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
String fileName = "girl.jpg";
if (fileName != null){
String realPath = "/Volumes/我的磁盘/图片/";
File file = new File(realPath,fileName);
fileName = new String(file.getName().getBytes("utf-8"));
String suffixNmae = fileName.substring(fileName.lastIndexOf("."));
String name = CommonUtils.generateUUID().toString();
fileName = name + suffixNmae;
if (file.exists()){
response.setContentType("application/force-download");
response.addHeader("Content-Disposition","attachment;fileName="+fileName);
byte[] buffer = new byte[1024];
FileInputStream fis = null;
BufferedInputStream bis = null;
try{
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
OutputStream os = response.getOutputStream();
int i = bis.read(buffer);
while(i != -1){
os.write(buffer,0,i);
i = bis.read(buffer);
}
System.out.println("success");
}catch (Exception e){
e.printStackTrace();
}finally {
if (bis != null){
try{
bis.close();
}catch (IOException e){
e.printStackTrace();
}
}
if (fis != null){
try{
fis.close();
}catch (IOException e){
e.printStackTrace();
}
}
}
}
}
System.out.println(fileName);
return fileName;
}
}
4.UUID代码
package com.tuanzi.utils;
import java.util.UUID;
/**
*工具类的封装uuid
*/
public class CommonUtils {
/**
*生成 uuid, 即用来标识一笔单,也用做 nonce_str
* @return
*/
public static String generateUUID(){
String uuid = UUID.randomUUID().toString().replaceAll("-","").substring(0,32);
return uuid;
}
}
5.运行项目访问http://localhost:8080/download就能下载文件了