JAVA SpringMVC + FormDate + Vue + file表单 ( 实现 js 单文件和多文件上传 )

JS 部分

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>文件上传</title>
    <script src="../js/commom.js"></script>
    <script src="../js/awi.js"></script>
    <script src="../js/vue.js"></script>
    <script src="../js/jquery.js"></script>
    <style type="text/css">
        html, body{ padding: 0; margin: 0 }
        #header{
            position: fixed;
            overflow: hidden;
            top: 0;
            width: 720px;
            height: 88px;
            background: #FF0000;
        }
        .header_back{
            float: left;
            width: 100px;
            font-size: 50px;
            color: white;
            height: 88px;
            line-height: 80px;
            text-indent: 30px;
        }
        .header_title{
            float: left;
            width: 520px;
            height: 88px;
            line-height: 88px;
            font-size: 36px;
            text-align: center;
            color: white;
            font-weight: bold;
        }
        #box {
            width: 720px;
            margin: 88px 0 0 0;
        }
        .img-list {
            width: 720px;
        }
        .img-list > img, .img-select, .file-select {
            display: block;
            width: 720px;
            height: 500px;
        }
        .file-select {
            margin: -500px 0 0 0;
            opacity: 0;
        }
        .file-send {
            width: 720px;
            height: 100xp;
            text-align: center;
            line-height: 100px;
            background: #000000;
            color: white;
            font-size: 36px;
        }
    </style>
</head>
<body>
    <div id="header">
        <div class="header_back"><</div>
        <div class="header_title">文件上传</div>
    </div>
    <div id="box">
        <div class="img-list">
            <img v-for="img in imgArr" :src="img" />
        </div>
        <img class="img-select" src="../img/001.png" />
        <input class="file-select" type="file" multiple="multiple" />
        <input class="file-send" type="button" value="发送" />
    </div>
</body>
<script type="text/javascript">

    var vm = new Vue({
        data: {
            imgArr: []
        }
    }).$mount('#box');

    var formData = new FormData();
    $('.file-select').on('change', function(){
        var files = this.files;
        var imgArr = [];
        for(var i = 0; i < files.length; i++){
            imgArr[i] = awi.fileToDataUrl(files[i]);
            formData.append('file', files[i]);
        }
        vm.imgArr = imgArr;
        console.dir(formData)
    });

    $('.file-send').on('click', function(){
        var xhr = new XMLHttpRequest();
        xhr.onerror = function(err){
            console.error("上传失败!" + err.message);
        }
        xhr.onload = function(){
            console.log(xhr.responseText);
        }
        xhr.open("POST", http + 'file/more_upload');
        xhr.send(formData);
    });

</script>
</html>

JAVA 代码

package controller.home;

import java.io.File;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import com.alibaba.fastjson.JSON;

@Controller
@CrossOrigin // 允许跨域
@RequestMapping("/file")
public class FileController {

    // 单文件上传
    @RequestMapping(value = "/upload", method = {RequestMethod.POST})
    public void upload(
        @RequestParam("file") MultipartFile file,
        HttpServletRequest req,
        Writer writer
    ) throws Exception{
        // 获取项目文件保存目录路径
        String projectPath = req.getServletContext().getRealPath("WEB-UD") + "/";
        // 获取真实存放的相对路径
        String relativePath = new Date().getTime() + file.getOriginalFilename();
        // 实例化文件对象, 并判断是否存在, 不存在创建目录
        File filePath = new File(projectPath + relativePath);
        if (!filePath.exists()) {
            filePath.mkdirs();
        }
        // 接收并保存文件
        file.transferTo(filePath);
        writer.write(relativePath);
    }

    // 多文件上传
    @RequestMapping(value = "/more_upload", method = {RequestMethod.POST})
    public void moreUpload(
        @RequestParam("file") MultipartFile[] files,
        HttpServletRequest req,
        Writer writer
    ) throws Exception{
        // 获取项目文件保存目录路径
        String projectPath = req.getServletContext().getRealPath("WEB-UD") + "/";
        // 定义存放地址
        List<String> relativePathArr = new ArrayList<String>();
        // 循环文件数组
        for(MultipartFile file : files){
            // 获取存放的相对路径
            String relativePath = new Date().getTime() + file.getOriginalFilename();
            // 实例化文件对象, 并判断是否存在, 不存在创建目录
            File filePath = new File(projectPath + relativePath);
            if (!filePath.exists()) {
                filePath.mkdirs();
            }
            // 接收并保存文件
            file.transferTo(filePath);
            relativePathArr.add(relativePath);
        }
        writer.write(JSON.toJSONString(relativePathArr));
    }

}