一次只能传一个文件，需在main.go同级目录中建一个upload文件夹
main.go
package main import (
"fmt"
"io"
"net/http"
"os"
) const (
upload_path string = "./upload/"
) //上传
func uploadHandle(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
io.WriteString(w, tpl)
} else {
//获取文件内容 要这样获取
file, head, err := r.FormFile("upfile")
fmt.Println(file)
if err != nil {
fmt.Println(err)
return
}
defer file.Close()
//创建文件
fW, err := os.Create(upload_path + head.Filename)
if err != nil {
fmt.Println("文件创建失败")
return
}
defer fW.Close()
_, err = io.Copy(fW, file)
if err != nil {
fmt.Println("文件保存失败")
return
}
fmt.Println(w, head.Filename+" 保存成功")
//io.WriteString(w, head.Filename+" 保存成功")
//http.Redirect(w, r, "/success", http.StatusFound)
//io.WriteString(w, head.Filename)
}
} func main() {
fmt.Println("OK!请访问 :8080/upload")
//启动一个http 服务器
http.HandleFunc("/upload", uploadHandle)
err := http.ListenAndServe(":8080", nil)
if err != nil {
fmt.Println("服务器启动失败")
return
}
} var tpl = `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>drag file</title>
</head>
<body>
<div class="container">
<div id="fileSpan" style="background-color:red;width:200px;height:200px"></div>
</div>
<script type="text/javascript">
window.onload = function(){
var uuz = document.getElementById('fileSpan'); uuz.ondragenter = function(e){
e.preventDefault();
} uuz.ondragover = function(e){
e.preventDefault();
this.innerHTML = '请松开';
} uuz.ondragleave = function(e){
e.preventDefault();
this.innerHTML = '请拖入要上传的文件';
} uuz.ondrop = function(e){
e.preventDefault(); var upfile = e.dataTransfer.files[]; //获取要上传的文件对象(可以上传多个)
alert(upfile.name)
alert(upfile.type)
var formdata = new FormData();
var xhr = new XMLHttpRequest();
formdata.append('upfile', upfile); //设置服务器端接收的name为upfile
xhr.open("post","upload");
xhr.onreadystatechange = function(){
if(this.readyState==){
if(this.status==){ //上传成功
var resultText = this.responseText;
console.info(resultText);
//转json
var jsonObj = JSON.parse(resultText);
console.info(jsonObj);
if(jsonObj.success){
//生成input表单
var fileId = createInput(jsonObj.uuid);
//生成显示名称
appendFile1(fileId,upfile.name);
}
}else{
alert('上传失败,请使用另一种方式上传');
}
}
} xhr.send(formdata);
}
}
</script>
</body>
</html>`
html部分参考：https://blog.csdn.net/nanfang1105/article/details/77965915
如需跨域，可参考：https://blog.csdn.net/benben_2015/article/details/79247024