springboot+vue Implementation of File Upload and Download
- 2021-09-20 19:30:54
- OfStack
This article example for everyone to share springboot + vue to achieve file upload and download the specific code, for your reference, the specific content is as follows
1. File upload (simple upload based on axios)
Technologies used: axios, springboot, vue;
Implementation idea: Select files through h5: input element tags, obtain the selected file path, new fromdata object, set fromdata parameters, set axios corresponding request header, and finally send post request back-end service through axios. The back-end service receives files through MultipartFile. The specific code is as follows:
Front end code:
1. Create an vue object
import Vue from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
import http from 'axios'
Vue.config.productionTip = false;
Vue.prototype.$http=http;
window.vm=new Vue({
router,
store,
render: h => h(App)
}).$mount('#app')
2. Implement upload component
Add a change event listener to the input tag and call the up method when a change occurs.
<template>
<div class="hello">
<input
class="file"
name="file"
type="file"
accept="image/png, image/gif, image/jpeg"
@change="up"
/>
</div>
</template>
<script>
export default {
name: "HelloWorld",
props: {
msg: String
},
methods: {
up(e) {
let file = e.target.files[0];
alert(file.name);
console.log(file);
let param = new FormData(); // Create form Object
param.append("file", file); // Pass append Toward form Object to add data
console.log(param.get("file")); //FormData Private class object, which cannot be accessed, can be accessed through get Judge whether the value is passed in
let config = {
headers: { "Content-Type": "multipart/form-data" }
}; // Add a request header
this.$http
.post("http://127.0.0.1:8081/data/up", param, config)
.then(response => {
console.log(response.data);
}).catch(
error=>{
alert(" Failure ");
}
);
}
}
};
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang="less">
</style>
Back-end code:
Upload file code
@RequestMapping(value = "/up", method = RequestMethod.POST)
@ResponseBody
public Result<String> uploade(@RequestParam("file") MultipartFile file) {
try {
log.error(" Start uploading! ! ! ");
String originalFilename = file.getOriginalFilename();
InputStream inputStream = file.getInputStream();
String path="d:/2020test/";
File file1 = new File(path + originalFilename);
if(!file1.getParentFile().exists()){
file1.getParentFile().mkdirs();
}
file.transferTo(file1);
log.info(" Upload successfully! ");
} catch (IOException e) {
e.printStackTrace();
}
Result<String> stringResult = new Result<String>();
stringResult.setMsg("sue");
stringResult.setData("file");
return stringResult;
}
2. File downloads
The contents of the file are returned through the response output stream, and the core code sets the name of the downloaded file (res. setHeader ("Content-Disposition", "attachment; filename=" + java. net. URLEncoder. encode (realFileName.trim (), "UTF-8"));)
@RequestMapping(value = "/get", method = RequestMethod.GET)
public void downloadFile(HttpServletResponse res) {
String realFileName="C:/Users/xiongyi/Desktop/12.xls";
File excelFile = new File(realFileName);
res.setCharacterEncoding("UTF-8");
res.setHeader("content-type", "application/octet-stream;charset=UTF-8");
res.setContentType("application/octet-stream;charset=UTF-8");
// Add the set size downloaded .xlsx The file will not be reported when it is opened Excel File-level validation and repair have been completed. Some parts of this workbook may have been repaired or discarded "
// res.addHeader("Content-Length", String.valueOf(excelFile.length()));
try {
res.setHeader("Content-Disposition", "attachment;filename=" + java.net.URLEncoder.encode(realFileName.trim(), "UTF-8"));
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
byte[] buff = new byte[1024];
BufferedInputStream bis = null;
OutputStream os = null;
try {
os = res.getOutputStream();
bis = new BufferedInputStream(new FileInputStream(new File(realFileName)));
int i = bis.read(buff);
while (i != -1) {
os.write(buff, 0, buff.length);
os.flush();
i = bis.read(buff);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
}
}
}
Result<String> stringResult = new Result<String>();
stringResult.setMsg("sue");
stringResult.setData("nimabi");
}