ajax上传单个文件
jsp页面
<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript" src="./js/jquery-3.5.1.min.js"></script>
<script type="text/javascript" src="./js/vue.js"></script>
<title>文件上传</title>
</head>
<body>
<input type="file" id="UUploadedFile" name="fileupload" onchange="UUploadedFile()">
<script type="text/javascript">
function UUploadedFile() {
var formData = new FormData();
formData.append('file', $('#UUploadedFile')[0].files[0]);
$.ajax({
async: false,//要求同步 不是不需看你的需求
url : "${pageContext.request.contextPath}/TestuploadFile.do",
type : 'POST',
data : formData,
dataType: "json",
processData : false, //必须false才会避开jQuery对 formdata 的默认处理
contentType : false, //必须false才会自动加上正确的Content-Type
success: function (data) {
if (data.success ) {
alert("上传完成！");
}else{
alert("上传失败！");
}
},
});
}
</script>
</body>
</html>
//java后端代码
package com.zjn.controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
@Controller
public class FileUpload {
@RequestMapping(value = "/TestuploadFile.do")
@ResponseBody
public Map<String, Object> TestuploadFile(HttpServletRequest request){
Map<String, Object> modelMap=new HashMap<String, Object>();
try {
MultipartHttpServletRequest mpRequest = (MultipartHttpServletRequest) request;
MultipartFile file = mpRequest.getFile("file");
System.out.println("file===="+file);
long fileSize = file.getSize();//获取文件大小
if (fileSize <= 0) {
modelMap.put("success", false);
modelMap.put("MESSAGE", "上传失败！上传的文件为空！");
return modelMap;
}
if (fileSize > 200 * 1024 * 1024) {//限制上传文件大小为200M
modelMap.put("success", false);
modelMap.put("MESSAGE", "上传失败！上传的文件大小超出了限制！");
return modelMap;
}
InputStream in = file.getInputStream();//读取上传的文件流
OutputStream out = new FileOutputStream("D:/"+file.getOriginalFilename());
File outFile=new File("D:/"+file.getOriginalFilename());//把文件输出到D盘下
byte[] buffer = new byte[1024];
int length;
while ((length = in.read(buffer)) > 0) {
out.write(buffer, 0, length);
}
in.close();
out.close();
if(outFile.exists()){//判断文件是否存在
modelMap.put("success", true);
modelMap.put("MESSAGE", "上传完成！");
}else {
modelMap.put("success", false);
modelMap.put("MESSAGE", "上传失败！");
return modelMap;
}
} catch (IOException e) {
modelMap.put("success", false);
modelMap.put("MESSAGE", "上传失败！");
return modelMap;
}
return modelMap;
}
}
