前端部分

md5.js md5加密

var KEY = "COURSE";
/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
    return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len)
{
    /* append padding */
    x[len >> 5] |= 0x80 << ((len) % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;

    var a =  1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d =  271733878;

    for(var i = 0; i < x.length; i += 16)
    {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;

        a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
        d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
        c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
        b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
        a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
        d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
        c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
        b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
        a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
        d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
        c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
        b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
        a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
        d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
        c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
        b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

        a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
        d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
        c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
        b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
        a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
        d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
        c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
        b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
        a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
        d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
        c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
        b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
        a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
        d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
        c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
        b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

        a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
        d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
        c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
        b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
        a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
        d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
        c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
        b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
        a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
        d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
        c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
        b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
        a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
        d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
        c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
        b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

        a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
        d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
        c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
        b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
        a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
        d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
        c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
        b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
        a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
        d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
        c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
        b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
        a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
        d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
        c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
        b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd);
    }
    return Array(a, b, c, d);

}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
    return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data)
{
    var bkey = str2binl(key);
    if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

    var ipad = Array(16), opad = Array(16);
    for(var i = 0; i < 16; i++)
    {
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C;
    }

    var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
    return core_md5(opad.concat(hash), 512 + 128);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
    return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str)
{
    var bin = Array();
    var mask = (1 << chrsz) - 1;
    for(var i = 0; i < str.length * chrsz; i += chrsz)
        bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
    return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin)
{
    var str = "";
    var mask = (1 << chrsz) - 1;
    for(var i = 0; i < bin.length * 32; i += chrsz)
        str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
    return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray)
{
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var str = "";
    for(var i = 0; i < binarray.length * 4; i++)
    {
        str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
            hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
    }
    return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray)
{
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str = "";
    for(var i = 0; i < binarray.length * 4; i += 3)
    {
        var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
            | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
            |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
        for(var j = 0; j < 4; j++)
        {
            if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
            else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
        }
    }
    return str;
}

tool.js 工具

Tool = {
    /**
     * 空校验 null或""都返回true
     */
    isEmpty: function (obj) {
        if ((typeof obj == 'string')) {
            return !obj || obj.replace(/\s+/g, "") == ""
        } else {
            return (!obj || JSON.stringify(obj) === "{}" || obj.length === 0);
        }
    },

    /**
     * 非空校验
     */
    isNotEmpty: function (obj) {
        return !this.isEmpty();
    },

    /**
     * 长度校验
     */
    isLength: function (str, min, max) {
        return $.trim(str).length >= min && $.trim(str).length <= max;
    },

    /**
     * 时间格式化，date为空时取当前时间
     */
    dateFormat: function (format, date) {
        let result;
        if (!date) {
            date = new Date();
        }
        const option = {
            "y+": date.getFullYear().toString(),        // 年
            "M+": (date.getMonth() + 1).toString(),     // 月
            "d+": date.getDate().toString(),            // 日
            "h+": date.getHours().toString(),           // 时
            "m+": date.getMinutes().toString(),         // 分
            "s+": date.getSeconds().toString()          // 秒
        };
        for (let i in option) {
            result = new RegExp("(" + i + ")").exec(format);
            if (result) {
                format = format.replace(result[1], (result[1].length == 1) ? (option[i]) : (option[i].padStart(result[1].length, "0")))
            }
        }
        return format;
    },

    /**
     * 移除对象数组中的对象
     * @param array
     * @param obj
     * @returns {number}
     */
    removeObj: function (array, obj) {
        let index = -1;
        for (let i = 0; i < array.length; i++) {
            if (array[i] === obj) {
                array.splice(i, 1);
                index = i;
                break;
            }
        }
        return index;
    },

    /**
     * 10进制转62进制
     * @param number
     * @returns {string}
     * @private
     */
    _10to62: function (number) {
        let chars = '0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ';
        let radix = chars.length;
        let arr = [];
        do {
            let mod = number % radix;
            number = (number - mod) / radix;
            arr.unshift(chars[mod]);
        } while (number);
        return arr.join('');
    }
};

index.html 上传页面

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <script src="" th:src="@{/js/md5.js}"></script>
    <script src="" th:src="@{/js/tool.js}"></script>
</head>
<body>
<button type="button" class="btn btn-default" onclick="selectImg()">文件上传</button>
<input class="hidden" multiple type="file" onchange="uploadImage()" id="file-upload-input">

<table class="table table-bordered tinfo" style="display: none;">
    <thead>
    <tr>
        <th>文件名称</th>
        <th>文件大小</th>
        <th>上传进度</th>
    </tr>
    </thead>
    <tbody id="upinfo">

    </tbody>
</table>

<div class="progress progress-striped active" style="display: none;">
    <div class="progress-bar progress-bar-success" role="progressbar"
         aria-valuenow="60" aria-valuemin="0" aria-valuemax="100"
         style="width: 40%;">
        <span class="sr-only">40% 完成</span>
    </div>
</div>

<script>
    function selectImg() {
        $("#file-upload-input").trigger("click");
    }
    function uploadImage (){
        let file = document.getElementById("file-upload-input").files;
        for (let i=0;i<file.length;i++){
            let info = '<tr>\n' +
                '        <td>'+ file[i].name +'</td>\n' +
                '        <td>'+ parseFloat(file[i].size/1024/1024).toFixed(2)+"M" +'</td>\n' +
                '        <td class="index'+ i +'">'+ '进行中'+'</td>\n' +
                '    </tr>';
            $("#upinfo").append(info);
            $(".tinfo").css("display","block");
            multiple_upload(file[i],i);
        }
    }

    //多文件上传 file 文件信息  curr 当前文件的索引
    function multiple_upload(file,curr) {
        // 文件分片
        var shardSize = 10 * 1024 * 1024; //以5MB为一个分片
        var shardIndex = 1;  //分片索引，1表示第1个分片
        var size = file.size; // 文件大小
        var shardTotal = Math.ceil(size / shardSize); //总片数
        var suffix = file.name.substring(file.name.lastIndexOf(".")+1);//文件后缀

        // 生成文件标识，标识多次上传的是不是同一个文件
        var key = hex_md5(file.name+file.lastModified+file.lastModifiedDate+file.webkitRelativePath+file.size+file.type);
        var key10 = parseInt(key, 16);
        var key62 = Tool._10to62(key10);
        console.log("文件的唯一表示",file.name,key, key10, key62);
        var param = {
            'shardIndex': shardIndex,
            'shardSize': shardSize,
            'shardTotal': shardTotal,
            'use': "file",
            'name': file.name,
            'suffix': suffix,
            'size': file.size,
            'key': key62
        };
        //文件上传
        upload_file(param,file,curr);
    }

    // 文件上传到服务器
    function upload_file(param,file,curr) {
        // 将图片转为base64进行传输
        var fileReader = new FileReader();
        let fileShard = getFileShard(param.shardIndex, param.shardSize,file);
        let progress = parseInt((param.shardIndex - 1) * 100 / param.shardTotal);
        $(".index"+curr).html(progress+"%");
        fileReader.onload = function(e) {
            var base64 = e.target.result;
            console.log("base64:", base64);
            param.shard = base64;
            $.ajax({
                url: "/admin/upload",
                type: "POST",
                data: JSON.stringify(param),
                contentType: 'application/json',
                /**
                 * 必须false才会避开jQuery对 formdata 的默认处理
                 * XMLHttpRequest会对 formdata 进行正确的处理
                 */
                processData: false,
                success: function (data) {
                    if (param.shardIndex < param.shardTotal) {
                        // 上传下一个分片
                        param.shardIndex = param.shardIndex + 1;
                        //大文件递归上传
                        upload_file(param,file,curr);
                    } else {
                        $(".index"+curr).html("已完成");
                        console.log("上传完成")
                    }
                },
                error: function () {
                    alert("上传失败！");
                }
            });
        };
        fileReader.readAsDataURL(fileShard);
    }

    //获取文件的分片
    function getFileShard (shardIndex, shardSize,file) {
        let start = (shardIndex - 1) * shardSize;   //当前分片起始位置
        let end = Math.min(file.size, start + shardSize); //当前分片结束位置
        let fileShard = file.slice(start, end); //从文件中截取当前的分片数据
        return fileShard;
    }

</script>
</body>
</html>

后端部分

FileDto.java 接收文件上传参数

package com.mracale.dto;

import com.fasterxml.jackson.annotation.JsonFormat;

import java.util.Date;

public class FileDto {

    /**
     * id
     */
    private String id;

    /**
     * 相对路径
     */
    private String path;

    /**
     * 文件名
     */
    private String name;

    /**
     * 后缀
     */
    private String suffix;

    /**
     * 大小|字节B
     */
    private Integer size;

    /**
     * 用途
     */
    private String use;

    /**
     * 创建时间
     */
    @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
    private Date createdAt;

    /**
     * 修改时间
     */
    @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
    private Date updatedAt;

    private Integer shardIndex;

    private Integer shardSize;

    private Integer shardTotal;

    private String key;

    /**
     * base64
     */
    private String shard;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSuffix() {
        return suffix;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }

    public Integer getSize() {
        return size;
    }

    public void setSize(Integer size) {
        this.size = size;
    }

    public String getUse() {
        return use;
    }

    public void setUse(String use) {
        this.use = use;
    }

    public Date getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(Date createdAt) {
        this.createdAt = createdAt;
    }

    public Date getUpdatedAt() {
        return updatedAt;
    }

    public void setUpdatedAt(Date updatedAt) {
        this.updatedAt = updatedAt;
    }

    public Integer getShardIndex() {
        return shardIndex;
    }

    public void setShardIndex(Integer shardIndex) {
        this.shardIndex = shardIndex;
    }

    public Integer getShardSize() {
        return shardSize;
    }

    public void setShardSize(Integer shardSize) {
        this.shardSize = shardSize;
    }

    public Integer getShardTotal() {
        return shardTotal;
    }

    public void setShardTotal(Integer shardTotal) {
        this.shardTotal = shardTotal;
    }

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public String getShard() {
        return shard;
    }

    public void setShard(String shard) {
        this.shard = shard;
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("FileDto{");
        sb.append("id='").append(id).append('\'');
        sb.append(", path='").append(path).append('\'');
        sb.append(", name='").append(name).append('\'');
        sb.append(", suffix='").append(suffix).append('\'');
        sb.append(", size=").append(size);
        sb.append(", use='").append(use).append('\'');
        sb.append(", createdAt=").append(createdAt);
        sb.append(", updatedAt=").append(updatedAt);
        sb.append(", shardIndex=").append(shardIndex);
        sb.append(", shardSize=").append(shardSize);
        sb.append(", shardTotal=").append(shardTotal);
        sb.append(", key='").append(key).append('\'');
        sb.append(", shard='").append(shard).append('\'');
        sb.append('}');
        return sb.toString();
    }
}

ResponseDto.java 前端返回类

package com.mracale.dto;

public class ResponseDto<T> {

    /**
     * 业务上的成功或失败
     */
    private boolean success = true;

    /**
     * 返回码
     */
    private String code;

    /**
     * 返回信息
     */
    private String message;

    /**
     * 返回泛型数据，自定义类型
     */
    private T content;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public boolean getSuccess() {
        return success;
    }

    public void setSuccess(boolean success) {
        this.success = success;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getContent() {
        return content;
    }

    public void setContent(T content) {
        this.content = content;
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("ResponseDto{");
        sb.append("success=").append(success);
        sb.append(", code='").append(code).append('\'');
        sb.append(", message='").append(message).append('\'');
        sb.append(", content=").append(content);
        sb.append('}');
        return sb.toString();
    }
}

Base64ToMultipartFile.java 前端base64上传，后端接收base64转为Multipart

package com.mracale.util;

import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;

import java.io.*;

public class Base64ToMultipartFile implements MultipartFile {

    private final byte[] imgContent;
    private final String header;

    public Base64ToMultipartFile(byte[] imgContent, String header) {
        this.imgContent = imgContent;
        this.header = header.split(";")[0];
    }

    @Override
    public String getName() {
        // TODO - implementation depends on your requirements
        return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
    }

    @Override
    public String getOriginalFilename() {
        // TODO - implementation depends on your requirements
        return System.currentTimeMillis() + (int) Math.random() * 10000 + "." + header.split("/")[1];
    }

    @Override
    public String getContentType() {
        // TODO - implementation depends on your requirements
        return header.split(":")[1];
    }

    @Override
    public boolean isEmpty() {
        return imgContent == null || imgContent.length == 0;
    }

    @Override
    public long getSize() {
        return imgContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(imgContent);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        new FileOutputStream(dest).write(imgContent);
    }

    public static MultipartFile base64ToMultipart(String base64) {
        try {
            String[] baseStrs = base64.split(",");

            BASE64Decoder decoder = new BASE64Decoder();
            byte[] b = new byte[0];
            b = decoder.decodeBuffer(baseStrs[1]);

            for(int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }

            return new Base64ToMultipartFile(b, baseStrs[0]);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}

UuidUtil.java

package com.mracale.util;

import java.util.UUID;

public class UuidUtil {

    public static String[] chars = new String[] { "a", "b", "c", "d", "e", "f",
            "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
            "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
            "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z" };


    /**
     * 获取短UUID
     * @return
     */
    public static String getShortUuid() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UuidUtil.getUuid();
        for (int i = 0; i < 8; i++) {
            String str = uuid.substring(i * 4, i * 4 + 4);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(chars[x % 0x3E]); // 对62取余
        }
        return shortBuffer.toString();

    }

    /**
     * 获得32位UUID
     */
    public static String getUuid(){
        String uuid = UUID.randomUUID().toString();
        //去掉“-”符号
        return uuid.replaceAll("-", "");
    }

    public static void main(String[] args) {
        System.out.println(getShortUuid());
    }
}

UploadController.java 控制器，接收前端文件上传

package com.mracale.controller;

import com.mracale.dto.FileDto;
import com.mracale.dto.ResponseDto;
import com.mracale.util.Base64ToMultipartFile;
import com.mracale.util.UuidUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;

@RequestMapping("/admin")
@RestController
public class UploadController {

    private static final Logger LOG = LoggerFactory.getLogger(UploadController.class);

    private static final String storePath = "D:/phpstudy_pro/WWW/java/springboot-test/file/";

    @RequestMapping("/upload1")
    public ResponseDto upload(@RequestParam MultipartFile file) throws Exception {
        LOG.info("上传文件开始：{}", file);
        LOG.info(file.getOriginalFilename());
        LOG.info(String.valueOf(file.getSize()));

        // 保存文件到本地
        String fileName = file.getOriginalFilename();
        String key = UuidUtil.getShortUuid();
        Date date = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd/");
        String format = simpleDateFormat.format(date);
        LOG.info("日期信息："+format);
        String fullPath = storePath + format;
        if (!new File(fullPath).exists()){
            new File(fullPath).mkdirs();
        }
        fullPath = fullPath + key + "-" + fileName;
        File dest = new File(fullPath);
        try{
            file.transferTo(dest);
        }catch (IOException e){
            e.printStackTrace();
        }
        LOG.info(dest.getAbsolutePath());
        ResponseDto responseDto = new ResponseDto();
        responseDto.setContent("http://127.0.0.1:8080/f/"+ format + key + "-" + fileName);
        return responseDto;
    }

    @RequestMapping("/upload")
    public ResponseDto upload(@RequestBody FileDto fileDto) throws Exception {
        LOG.info("上传文件开始");
        String use = fileDto.getUse();
        String key = fileDto.getKey();
        String suffix = fileDto.getSuffix();
        String shardBase64 = fileDto.getShard();
        MultipartFile shard = Base64ToMultipartFile.base64ToMultipart(shardBase64);

        // 保存文件到本地
        Date date = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd/");
        String format = simpleDateFormat.format(date);
        LOG.info("日期信息："+format);
        String fullPath = storePath + format;
        if (!new File(fullPath).exists()){
            new File(fullPath).mkdirs();
        }
        String path = new StringBuffer(fullPath)
                .append(key)
                .append(".")
                .append(suffix)
                .toString(); // course\6sfSqfOwzmik4A4icMYuUe.mp4
        String localPath = new StringBuffer(path)
                .append(".")
                .append(fileDto.getShardIndex())
                .toString(); // course\6sfSqfOwzmik4A4icMYuUe.mp4.1
        File dest = new File(localPath);
        shard.transferTo(dest);
        LOG.info(dest.getAbsolutePath());
        LOG.info("保存文件记录开始");
        fileDto.setPath(path);
        // 合并分片
        if (fileDto.getShardIndex().equals(fileDto.getShardTotal())) {
            this.merge(fileDto);
        }
        ResponseDto<Object> responseDto = new ResponseDto<>();
        return responseDto;
    }

    public void merge(FileDto fileDto) throws Exception {
        LOG.info("合并分片开始");
        String path = fileDto.getPath(); //http://127.0.0.1:9000/file/f/course\6sfSqfOwzmik4A4icMYuUe.mp4
        Integer shardTotal = fileDto.getShardTotal();
        File newFile = new File(path);
        FileOutputStream outputStream = new FileOutputStream(newFile, true);//文件追加写入
        FileInputStream fileInputStream = null;//分片文件
        byte[] byt = new byte[10 * 1024 * 1024];
        int len;
        try {
            for (int i = 0; i < shardTotal; i++) {
                // 读取第i个分片
                fileInputStream = new FileInputStream(new File( path + "." + (i + 1))); //  course\6sfSqfOwzmik4A4icMYuUe.mp4.1
                while ((len = fileInputStream.read(byt)) != -1) {
                    outputStream.write(byt, 0, len);
                }
            }
        } catch (IOException e) {
            LOG.error("分片合并异常", e);
        } finally {
            try {
                if (fileInputStream != null) {
                    fileInputStream.close();
                }
                outputStream.close();
                LOG.info("IO流关闭");
            } catch (Exception e) {
                LOG.error("IO流关闭", e);
            }
        }
        LOG.info("合并分片结束");

        // 删除分片
        LOG.info("删除分片开始");
        File file = null;
        String filePath = "";
        for (int i = 0; i < shardTotal; i++) {
            filePath =  path + "." + (i + 1);
            file = new File(filePath);
            System.gc();
            boolean result = file.delete();
            LOG.info("删除{}，{}", filePath, result ? "成功" : "失败");
        }
        LOG.info("删除分片结束");
    }
}