项目中需求，多图片上传，且对图片进行压缩处理。考虑到带宽的问题，决定采用js压缩方式。
前台压缩方式，网上找了一部分资料。基本采用的方式是通过构建cavns来进行构建。之后转换为Base64码上传到后台，后台可通过转码方式获取到图片。
本实例展开方式：
一、前台
1.1、库文件
文件名：multiimagepress.js
库文件为网上获取，本地进行部分修改后，内容贴出如下：
/**
* Created by devin on 2017/9/27.
*/
var imgData = undefined; //判断图片是否压缩中
var imgMultiData = []; //图片压缩完成数据
var imgNum = 0; //图片数目
/**
* 入口调用处
* @param $multiImageInput
* @param width
* @param quality
* @returns {Array}
*/
$.fn.initResizeImgMulti = function ($multiImageInput, width, quality) {
//循环压缩
$multiImageInput.localResizeIMG($multiImageInput, {
width: (width ? width : 1200),
quality: (quality ? quality : 0.5),
success: function (result) {
//递归函数防止同时调用
checkMulti();
imgMultiData[imgNum] = result;
imgNum++;
}
});
};
function checkMulti() {
if (imgMultiData[imgNum]) {
imgNum++;
checkMulti();
}
}
function resetSelf() {
imgData = undefined; //判断图片是否压缩中
imgMultiData = []; //图片压缩完成数据
imgNum = 0; //图片数目
}
/**
* 压缩图片提交后台
* @param url
* @param param
* @param successFn
* @param errorFun
*/
$.fn.uploadResizeImgMulti = function (url, param, successFn, errorFun) {
if (!imgData) {
showNoticeToast("未发现图片");
return;
}
if (!imgMultiData) {
showNoticeToast("图片压缩中......");
return;
}
param.imgMultiDataStr = JSON.stringify(imgMultiData);
$.ajax({
url: url,
type: 'post',
data: param,
dataType: "json",
async: true, //默认为true 异步
success: function (result) {
if (result.success) {
// debugger
if (successFn) {
successFn(result);
} else {
showSuccessToast(result.message);
}
} else {
if (errorFun) {
errorFun();
} else {
showWarningToast(result.message);
}
}
//置空
resetSelf();
},
error: function () {
showErrorToast('请求失败！')
}
});
}
/**
* 获得base64 上传时压缩
* @param {Object} obj
* @param {Number} [obj.width] 图片需要压缩的宽度，高度会跟随调整
* @param {Number} [obj.quality=0.8] 压缩质量，不压缩为1
* @param {Function} [obj.before(this, blob, file)] 处理前函数,this指向的是input:file
* @param {Function} obj.success(obj) 处理后函数
*
*/
$.fn.localResizeIMG = function ($multiImageInput, obj) {
$multiImageInput.on('change', function () {
var files = $multiImageInput[0].files;
var URL = window.URL || window.webkitURL;
// 执行前函数
if ($.isFunction(obj.before)) {
obj.before(this, blob, file);
}
_create(files, URL);
this.value = ''; // 清空临时数据
});
/**
* 生成base64
* @param blob 通过file获得的二进制
*/
function _create(files, URL) {
var len = files.length;
for (var i = 0; i < len; i++) {
var file = files[i];
var pre = file.name;
var blob = URL.createObjectURL(file);
var img = new Image();
img.src = blob;
img.onload = function () {
var that = this;
//生成比例
var w = that.width, h = that.height, scale = w / h;
w = obj.width || w;
h = w / scale;
//生成canvas
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
$(canvas).attr({
width: w,
height: h
});
ctx.drawImage(that, 0, 0, w, h);
/**
* 生成base64
* 兼容修复移动设备需要引入mobileBUGFix.js
*/
var base64 = canvas.toDataURL('image/jpeg', obj.quality || 0.8);
// 修复IOS
if (navigator.userAgent.match(/iphone/i)) {
var mpImg = new MegaPixImage(img);
mpImg.render(canvas, {
maxWidth: w,
maxHeight: h,
quality: obj.quality || 0.8
});
base64 = canvas.toDataURL('image/jpeg', obj.quality || 0.8);
}
// 修复android
if (navigator.userAgent.match(/Android/i)) {
var encoder = new JPEGEncoder();
base64 = encoder.encode(ctx.getImageData(0, 0, w, h),
obj.quality * 100 || 80);
}
// 生成结果
var base64_string = base64.substr(base64.indexOf(',') + 1);
var fileSuffix = pre.substr(pre.lastIndexOf("."));
var result = {
fileSuffix: fileSuffix,
fileName: pre,
fileData: base64_string
};
// 执行后函数
imgData = result;
obj.success(result);
};
}
}
}1.2、文件引入
<script src="${pageContext.request.contextPath}/js/imagecompress/multiimagepress.js"></script>
<script src="${pageContext.request.contextPath}/js/imagecompress/mobileBUGFix.mini.js"></script>说明：multiimagepress.js如上，mobileBUGFix.mini.js用于适配移动端。未测试，贴出如下，无，不影响非移动端功能。
文件名：mobileBUGFix.mini.js
/* jpeg_encoder_basic.js for android jpeg压缩质量修复 */
function JPEGEncoder(a){function I(a){var c,i,j,k,l,m,n,o,p,b=[16,11,10,16,24,40,51,61,12,12,14,19,26,58,60,55,14,13,16,24,40,57,69,56,14,17,22,29,51,87,80,62,18,22,37,56,68,109,103,77,24,35,55,64,81,104,113,92,49,64,78,87,103,121,120,101,72,92,95,98,112,100,103,99];for(c=0;64>c;c++)i=d((b[c]*a+50)/100),1>i?i=1:i>255&&(i=255),e[z[c]]=i;for(j=[17,18,24,47,99,99,99,99,18,21,26,66,99,99,99,99,24,26,56,99,99,99,99,99,47,66,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99],k=0;64>k;k++)l=d((j[k]*a+50)/100),1>l?l=1:l>255&&(l=255),f[z[k]]=l;for(m=[1,1.387039845,1.306562965,1.175875602,1,.785694958,.5411961,.275899379],n=0,o=0;8>o;o++)for(p=0;8>p;p++)g[n]=1/(8*e[z[n]]*m[o]*m[p]),h[n]=1/(8*f[z[n]]*m[o]*m[p]),n++}function J(a,b){var f,g,c=0,d=0,e=new Array;for(f=1;16>=f;f++){for(g=1;g<=a[f];g++)e[b[d]]=[],e[b[d]][0]=c,e[b[d]][1]=f,d++,c++;c*=2}return e}function K(){i=J(A,B),j=J(E,F),k=J(C,D),l=J(G,H)}function L(){var 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c.width=b.width,c.height=b.height,d=c.getContext("2d"),d.drawImage(b,0,0),d.getImageData(0,0,c.width,c.height)}
/* megapix-image.js for IOS(iphone5+) drawImage画面扭曲修复 */
!function(){function a(a){var d,e,b=a.naturalWidth,c=a.naturalHeight;return b*c>1048576?(d=document.createElement("canvas"),d.width=d.height=1,e=d.getContext("2d"),e.drawImage(a,-b+1,0),0===e.getImageData(0,0,1,1).data[3]):!1}function b(a,b,c){var e,f,g,h,i,j,k,d=document.createElement("canvas");for(d.width=1,d.height=c,e=d.getContext("2d"),e.drawImage(a,0,0),f=e.getImageData(0,0,1,c).data,g=0,h=c,i=c;i>g;)j=f[4*(i-1)+3],0===j?h=i:g=i,i=h+g>>1;return k=i/c,0===k?1:k}function c(a,b,c){var e=document.createElement("canvas");return d(a,e,b,c),e.toDataURL("image/jpeg",b.quality||.8)}function d(c,d,f,g){var m,n,o,p,q,r,s,t,u,v,w,h=c.naturalWidth,i=c.naturalHeight,j=f.width,k=f.height,l=d.getContext("2d");for(l.save(),e(d,l,j,k,f.orientation),m=a(c),m&&(h/=2,i/=2),n=1024,o=document.createElement("canvas"),o.width=o.height=n,p=o.getContext("2d"),q=g?b(c,h,i):1,r=Math.ceil(n*j/h),s=Math.ceil(n*k/i/q),t=0,u=0;i>t;){for(v=0,w=0;h>v;)p.clearRect(0,0,n,n),p.drawImage(c,-v,-t),l.drawImage(o,0,0,n,n,w,u,r,s),v+=n,w+=r;t+=n,u+=s}l.restore(),o=p=null}function e(a,b,c,d,e){switch(e){case 5:case 6:case 7:case 8:a.width=d,a.height=c;break;default:a.width=c,a.height=d}switch(e){case 2:b.translate(c,0),b.scale(-1,1);break;case 3:b.translate(c,d),b.rotate(Math.PI);break;case 4:b.translate(0,d),b.scale(1,-1);break;case 5:b.rotate(.5*Math.PI),b.scale(1,-1);break;case 6:b.rotate(.5*Math.PI),b.translate(0,-d);break;case 7:b.rotate(.5*Math.PI),b.translate(c,-d),b.scale(-1,1);break;case 8:b.rotate(-.5*Math.PI),b.translate(-c,0)}}function f(a){var b,c,d;if(window.Blob&&a instanceof Blob){if(b=new Image,c=window.URL&&window.URL.createObjectURL?window.URL:window.webkitURL&&window.webkitURL.createObjectURL?window.webkitURL:null,!c)throw Error("No createObjectURL function found to create blob url");b.src=c.createObjectURL(a),this.blob=a,a=b}a.naturalWidth||a.naturalHeight||(d=this,a.onload=function(){var b,c,a=d.imageLoadListeners;if(a)for(d.imageLoadListeners=null,b=0,c=a.length;c>b;b++)a[b]()},this.imageLoadListeners=[]),this.srcImage=a}f.prototype.render=function(a,b,e){var f,g,h,i,j,k,l,m,n,o,p;if(this.imageLoadListeners)return f=this,this.imageLoadListeners.push(function(){f.render(a,b,e)}),void 0;b=b||{},g=this.srcImage.naturalWidth,h=this.srcImage.naturalHeight,i=b.width,j=b.height,k=b.maxWidth,l=b.maxHeight,m=!this.blob||"image/jpeg"===this.blob.type,i&&!j?j=h*i/g<<0:j&&!i?i=g*j/h<<0:(i=g,j=h),k&&i>k&&(i=k,j=h*i/g<<0),l&&j>l&&(j=l,i=g*j/h<<0),n={width:i,height:j};for(o in b)n[o]=b[o];p=a.tagName.toLowerCase(),"img"===p?a.src=c(this.srcImage,n,m):"canvas"===p&&d(this.srcImage,a,n,m),"function"==typeof this.onrender&&this.onrender(a),e&&e()},"function"==typeof define&&define.amd?define([],function(){return f}):this.MegaPixImage=f}();1.3、JS代码
js代码分两部分：
1. 需要初始化加载函数，该部分实现选取图片后通过change函数执行压缩。
//初始化压缩函数
$.fn.initResizeImgMulti($("#fileImage"));- 点击上传
//上传图片
$.fn.uploadResizeImgMulti("order/datumList/batchInsertDatumLists", {
foldName: "datumList",
}, successFn);
function successFn(result) {
//清空框文件内容
$("#fileImage").val("");
var obj = document.getElementById('fileImage');
obj.outerHTML = obj.outerHTML;
refreshDatumList();
showSuccessToast(result.message);
}二、后台
2.1、库文件
文件名：UploadPressImgMulti.java
import com.alibaba.fastjson.JSONObject;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
* Created by devin on 2017/9/27.
*/
public class UploadPressImgMulti {
/**
* 上传多个前台压缩图片(保存新文件名)
* 只获取单input框上传
*
* @param request
* @param folderPath
* @return
* @throws Exception
*/
public static List<UploadFile> uploadMultiImg(HttpServletRequest request, String folderPath) throws Exception {
List<UploadFile> resultList = new ArrayList<>();
String imgMultiDataStr = request.getParameter("imgMultiDataStr");
if (imgMultiDataStr == null || imgMultiDataStr.equals("")) {
return resultList;
}
List<Map> mapList = JSONObject.parseArray(imgMultiDataStr, Map.class);
for (Map<String, Object> imgMap : mapList) {
String type = (String) imgMap.get("fileSuffix");
String originalFileName = (String) imgMap.get("fileName");
String fileData = (String) imgMap.get("fileData");
String newFileName = originalFileName.replaceAll("=|,|&|" + type + "$", "") + System.currentTimeMillis() + type;//拼接新名字
//获得项目绝对路径前缀
String absolutePathPre = UploadDownloadTools.getAbsolutePathPre();
//年月文件夹 + 特定文件夹
DateFormat simpleDateFormat = new SimpleDateFormat("yyyyMM");
String monthPath = simpleDateFormat.format(new Date(System.currentTimeMillis()));
//转储图片
String outPath = absolutePathPre + File.separator + monthPath + File.separator + folderPath;
File outFile = new File(outPath);
if (!outFile.exists()) {
outFile.mkdirs();
}
String storePath = outPath + File.separator + newFileName;
if (!generateImage(fileData, storePath)) {
continue;
}
//返回数据
UploadFile fileMsg = new UploadFile();
fileMsg.setFileName(originalFileName);
fileMsg.setNewFileName(newFileName);
fileMsg.setType(type);
fileMsg.setUrl(monthPath + File.separator + folderPath + File.separator + newFileName);
resultList.add(fileMsg);
}
return resultList;
}
//将base64字符文件输出图像
private static boolean generateImage(String imgStr, String folderPath) {
// 对字节数组字符串进行Base64解码并生成图片
if (imgStr == null) // 图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try {
// Base64解码
byte[] b = decoder.decodeBuffer(imgStr);
for (int i = 0; i < b.length; ++i) {
if (b[i] < 0) {// 调整异常数据
b[i] += 256;
}
}
// 生成jpeg图片
OutputStream out = new FileOutputStream(folderPath);
out.write(b);
out.flush();
out.close();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
// 图片转化成base64字符串
public static String getImageStr() {
// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
String imgFile = "d://test.jpg";// 待处理的图片
InputStream in = null;
byte[] data = null;
// 读取图片字节数组
try {
in = new FileInputStream(imgFile);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);// 返回Base64编码过的字节数组字符串
}
}2.2、Java代码
java代码，直接调用方法：
List<UploadFile> fileMsgList = UploadPressImgMulti.uploadMultiImg(request, folderPath);以上内容，基于网上找寻的资料，鉴于库文件暂时没看怎么获取，直接贴出，使用时可直接复制新建文件即可。库文件为网上资料结合具体项目内容，会存在一些不兼容处，需修改后使用。
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