springboot+vue实现页面下载文件
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2022-05-15 15:22:06
本文实例为大家分享了springboot+vue页面下载文件的具体代码，供大家参考，具体内容如下1.前端代码： &...
本文实例为大家分享了springboot+vue页面下载文件的具体代码，供大家参考，具体内容如下
1.前端代码：
<template v-slot:operate="{ row }">
<vxe-button style="color: #409eff; font-weight: bolder" class="el-icon-download" title="成果下载" circle @click="downloadfile(row)"></vxe-button>
</template>
downloadfile(row) {
window.location = "http://localhost:8001/file/downloadfile?taskid=" + row.id;
}
2.后端代码：
package com.gridknow.analyse.controller;
import com.alibaba.fastjson.json;
import com.gridknow.analyse.entity.datainfo;
import com.gridknow.analyse.service.fileservice;
import com.gridknow.analyse.utils.download;
import com.gridknow.analyse.utils.result;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.beans.factory.annotation.value;
import org.springframework.core.io.inputstreamresource;
import org.springframework.http.httpheaders;
import org.springframework.http.mediatype;
import org.springframework.http.responseentity;
import org.springframework.stereotype.controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.multipartfile;
import org.springframework.web.multipart.multiparthttpservletrequest;
import javax.servlet.http.httpservletresponse;
import java.io.*;
import java.util.list;
import java.util.map;
/**
* @classname filecontroller
* @description: todo
* @author administrator
* @date 2020/8/20 14:02
* @version todo
**/
@controller
@requestmapping("/file")
public class filecontroller {
@value("${gridknow.mltc.imgurl}")
private string imgurl;
@autowired
private fileservice fileservice;
@crossorigin
@requestmapping(value = "/upload", method = requestmethod.post)
@responsebody
public result upload(multiparthttpservletrequest request) {
list<multipartfile> multipartfiles = request.getfiles("file");
map<string, object> map = (map<string, object>) json.parse(request.getparameter("body"));
string companyid = request.getparameter("companyid");
string companyname = request.getparameter("companyname");
boolean bool = fileservice.uploadandinsert(multipartfiles, map, companyid, companyname);
if (bool) {
return new result(200);
} else {
return new result(500);
}
}
@getmapping("/downloadfile")
public responseentity<object> downloadfile(@requestparam("taskid") string taskid, httpservletresponse response) {
datainfo datainfo = fileservice.querytaskbyid(taskid);
if (datainfo == null) {
return null;
}
file file = new file(datainfo.getresponseurl());
// 文件下载
if (file.isfile()) {
return downloadfile(taskid);
}
// 文件夹压缩成zip下载
if (file.isdirectory()) {
string parent = file.getparent();
// 创建临时存放文件夹
file temdir = new file(parent + "/" + taskid);
if (!temdir.exists()) {
temdir.mkdirs();
}
// 将需要下载的文件夹和内容拷贝到临时文件夹中
try {
download.copydir(datainfo.getresponseurl(), parent + "/" + taskid);
} catch (ioexception e) {
e.printstacktrace();
}
// 设置头部格式
response.setcontenttype("application/zip");
response.setheader("content-disposition", "attachment; filename="+taskid+".zip");
// 调用工具类，下载zip压缩包
try {
download.tozip(temdir.getpath(), response.getoutputstream(), true);
} catch (ioexception e) {
e.printstacktrace();
}
// 删除临时文件夹和内容
download.delallfile(new file(parent + "/" + taskid));
}
return null;
}
public responseentity<object> downloadfile(string taskid) {
datainfo datainfo = fileservice.querytaskbyid(taskid);
if (datainfo == null) {
return null;
}
file file = new file(datainfo.getresponseurl());
string filename = file.getname();
inputstreamresource resource = null;
try {
resource = new inputstreamresource(new fileinputstream(file));
} catch (exception e) {
e.printstacktrace();
}
httpheaders headers = new httpheaders();
headers.add("content-disposition", string.format("attachment;filename=\"%s", filename));
headers.add("cache-control", "no-cache,no-store,must-revalidate");
headers.add("pragma", "no-cache");
headers.add("expires", "0");
responseentity<object> responseentity = responseentity.ok()
.headers(headers)
.contentlength(file.length())
.contenttype(mediatype.parsemediatype("application/octet-stream"))
.body(resource);
return responseentity;
}
}
工具类
package com.gridknow.analyse.utils;
import lombok.extern.slf4j.slf4j;
import java.io.*;
import java.util.zip.zipentry;
import java.util.zip.zipoutputstream;
/**
* @classname download
* @description: todo
* @author administrator
* @date 2020/9/2 9:54
* @version todo
**/
@slf4j
public class download {
private static final int buffer_size = 2 * 1024;
public static void tozip(string srcdir, outputstream out, boolean keepdirstructure) throws runtimeexception {
long start = system.currenttimemillis();
zipoutputstream zos = null;
try {
zos = new zipoutputstream(out);
file sourcefile = new file(srcdir);
compress(sourcefile, zos, sourcefile.getname(), keepdirstructure);
long end = system.currenttimemillis();
log.info("压缩完成，耗时：" + (end - start) + " ms");
} catch (exception e) {
throw new runtimeexception("zip error from ziputils", e);
} finally {
if (zos != null) {
try {
zos.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
}
}
/**
* 递归压缩方法
*
* @param sourcefile 源文件
* @param zos zip输出流
* @param name 压缩后的名称
* @param keepdirstructure 是否保留原来的目录结构, true:保留目录结构;
* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
* @throws exception
*
*/
private static void compress(file sourcefile, zipoutputstream zos, string name, boolean keepdirstructure)
throws exception {
byte[] buf = new byte[buffer_size];
if (sourcefile.isfile()) {
// 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
zos.putnextentry(new zipentry(name));
// copy文件到zip输出流中
int len;
fileinputstream in = new fileinputstream(sourcefile);
while ((len = in.read(buf)) != -1) {
zos.write(buf, 0, len);
}
// complete the entry
zos.closeentry();
in.close();
} else {
file[] listfiles = sourcefile.listfiles();
if (listfiles == null || listfiles.length == 0) {
// 需要保留原来的文件结构时,需要对空文件夹进行处理
if (keepdirstructure) {
// 空文件夹的处理
zos.putnextentry(new zipentry(name + "/"));
// 没有文件，不需要文件的copy
zos.closeentry();
}
} else {
for (file file : listfiles) {
// 判断是否需要保留原来的文件结构
if (keepdirstructure) {
// 注意：file.getname()前面需要带上父文件夹的名字加一斜杠,
// 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
compress(file, zos, name + "/" + file.getname(), keepdirstructure);
} else {
compress(file, zos, file.getname(), keepdirstructure);
}
}
}
}
}
/**
* 拷贝文件夹
*
* @param oldpath 原文件夹
* @param newpath 指定文件夹
*/
public static void copydir(string oldpath, string newpath) throws ioexception {
file file = new file(oldpath);
//文件名称列表
string[] filepath = file.list();
if (!(new file(newpath)).exists()) {
(new file(newpath)).mkdir();
}
for (int i = 0; i < filepath.length; i++) {
if ((new file(oldpath + file.separator + filepath[i])).isdirectory()) {
copydir(oldpath + file.separator + filepath[i], newpath + file.separator + filepath[i]);
}
if (new file(oldpath + file.separator + filepath[i]).isfile()) {
copyfile(oldpath + file.separator + filepath[i], newpath + file.separator + filepath[i]);
}
}
}
/**
* 拷贝文件
*
* @param oldpath 资源文件
* @param newpath 指定文件
*/
public static void copyfile(string oldpath, string newpath) throws ioexception {
file oldfile = new file(oldpath);
file file = new file(newpath);
fileinputstream in = new fileinputstream(oldfile);
fileoutputstream out = new fileoutputstream(file);;
byte[] buffer=new byte[2097152];
while((in.read(buffer)) != -1){
out.write(buffer);
}
in.close();
out.close();
}
/**
* 删除文件或文件夹
* @param directory
*/
public static void delallfile(file directory){
if (!directory.isdirectory()){
directory.delete();
} else{
file [] files = directory.listfiles();
// 空文件夹
if (files.length == 0){
directory.delete();
system.out.println("删除" + directory.getabsolutepath());
return;
}
// 删除子文件夹和子文件
for (file file : files){
if (file.isdirectory()){
delallfile(file);
} else {
file.delete();
system.out.println("删除" + file.getabsolutepath());
}
}
// 删除文件夹本身
directory.delete();
system.out.println("删除" + directory.getabsolutepath());
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。