java input 實現調用手機相機和本地照片上傳圖片到服務器而後壓縮

在微信公衆號裏面須要上傳頭像，時間比較緊，調用學習jssdk並使用 來不及  就用了input

1. 使用input：file標籤, 去調用系統默認相機，攝像，錄音功能，實際上是有個capture屬性，直接說明須要調用什麼功能

   <input type="file" accept="image/*" capture="camera">

   <input type="file" accept="video/*" capture="camcorder">

   <input type="file" accept="audio/*" capture="microphone">

   capture表示，能夠捕獲到系統默認的設備，好比：camera--照相機；camcorder--攝像機；microphone--錄音。

   accept表示，直接打開系統文件目錄。

2. input:file標籤還支持一個multiple屬性，表示能夠支持多選，如：

   <input type="file" accept="image/*" multiple>

   加上這個multiple後，capture就沒啥用了，由於multiple是專門用來支持多選的。

用form表單提交

<form id="uploadForm" class="mui-input-group" style="width: 80%;margin: 0 auto;margin-top: 70px" action="/jxs/uploadtou.do" method="post" enctype="multipart/form-data" >
        <div class="mui-input-row">
            <label>圖片</label>
            <input required="required" class="mui-input-clear mui-input" type="file" name="file" id="photo_pick"  accept="image/*">
        </div>

        <div class="mui-content-padded" style="width: 90%;margin: 0 auto;margin-top: 5px;padding: 10px">
            <input style="color:#FFFFFF ;width: 100%;background: #00F7DE" value="上傳" type="submit">
        </div>
    </form>

上傳以後圖片顯示在頁面上

<div class="progress_dialog" style="margin-left:30px;margin-top:20px;width: 50%;height: 50%;"></div>

js

<script>
    /*圖片地址 https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E9%AB%98%E6%B8%85%E7%BE%8E%E5%A5%B3%20%E4%B8%9D%E8%A2%9C%E5%B7%A8%E4%B9%B3&step_word=&hs=0&pn=1&spn=0&di=57234189540&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=2&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=-1&cs=3589338782%2C536437810&os=3988412231%2C488396405&simid=3515890414%2C233897128&adpicid=0&lpn=0&ln=1389&fr=&fmq=1490709487003_R&fm=result&ic=0&s=undefined&se=&sme=&tab=0&width=&height=&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=http%3A%2F%2Fwww.bz55.com%2Fuploads%2Fallimg%2F150416%2F139-1504161AK9.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bkzcc_z%26e3Bv54AzdH3F4jtgektzitAzdH3F8l9c9_z%26e3Bip4s&gsm=0&rpstart=0&rpnum=0 */ $(function() { $("#photo_pick").on("change", function () { var file = this.files[0]; photoCompress(file, 50, $(".progress_dialog")[0]) $(".progress_dialog").show(); if (!this.files.length) return; var files = Array.prototype.slice.call(this.files); if (files.length > 9) { alert("最多同時只可上傳9張圖片"); return; } /* files.forEach(function (file, i) { /!*var reader = new FileReader(); reader.onload = function () { var imgO = document.createElement("img"); imgO.src = reader.result; }*!/ reader.readAsDataURL(file); $(".progress_dialog").hide();*/ }); }) /* 三個參數 file：一個是文件(類型是圖片格式)， w：一個是文件壓縮的後寬度，寬度越小，字節越小 objDiv：一個是容器或者回調函數 photoCompress() */ function photoCompress(file, w, objDiv) { var ready = new FileReader(); /*開始讀取指定的Blob對象或File對象中的內容. 當讀取操做完成時,readyState屬性的值會成爲DONE,若是設置了onloadend事件處理程序,則調用之.同時,result屬性中將包含一個data: URL格式的字符串以表示所讀取文件的內容.*/ ready.readAsDataURL(file); ready.onload = function () { var re = this.result; canvasDataURL(re, w, objDiv) } } function canvasDataURL(re, w, objDiv) { var newImg = new Image(); newImg.src = re; var imgWidth, imgHeight, offsetX = 0, offsetY = 0; newImg.onload = function () { var img = document.createElement("img"); img.src = newImg.src; imgWidth = img.width; imgHeight = img.height; var canvas = document.createElement("canvas"); canvas.width = w; canvas.height = w; var ctx = canvas.getContext("2d"); ctx.clearRect(0, 0, w, w); if (imgWidth > imgHeight) { imgWidth = w * imgWidth / imgHeight; imgHeight = w; offsetX = -Math.round((imgWidth - w) / 6); } else { imgHeight = w * imgHeight / imgWidth; imgWidth = w; offsetY = -Math.round((imgHeight - w) / 6); } ctx.drawImage(img, offsetX, offsetY, imgWidth, imgHeight); var base64 = canvas.toDataURL("image/jpeg", 0.1); if (typeof objDiv == "object") { objDiv.appendChild(canvas); } else if (typeof objDiv == "function") { objDiv(base64); } } } </script>

後臺接收以及壓縮

@PostMapping("/uploadtou.do") public String uploadtou(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request) throws IOException { System.out.println(file); String result = ""; if (!file.isEmpty()) { try { Shopuser u = (Shopuser) request.getSession().getAttribute("currentUser"); String extName = file.getOriginalFilename(); String fileName = file.getName(); String suffix = extName.substring(extName.lastIndexOf(".") + 1); System.err.println(suffix); Date now = new Date(); SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss"); String s = outFormat.format(now); BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(new File("D:\\xiangmu\\demo\\" + s + "." + suffix))); bos.write(file.getBytes()); bos.flush(); bos.close(); /** * compress 圖片縮放類的使用(縮略圖) * srcImage 爲InputStream對象 * Rectangle 爲須要截圖的長方形座標 * proportion 爲壓縮比例 * **/ InputStream in = null; //縮放後須要保存的路徑
                File saveFile = new File("D:\\xiangmu\\demo\\" + s + s + "." + suffix); try { //原圖片的路徑
                    in = new FileInputStream(new File("D:\\xiangmu\\demo\\" + s + "." + suffix)); int length = in.available(); if (length / 1024 >= 10 && length / 1024 < 100) { if (compress(in, saveFile, 10)) { System.out.println("圖片壓縮十倍！"); } } else if (length / 1024 >= 100 && length / 1024 < 1000) { if (compress(in, saveFile, 100)) { System.out.println("圖片壓縮100倍！"); } } else if (length / 1024 >= 1000 && length / 1024 < 10000) { if (compress(in, saveFile, 1000)) { System.out.println("圖片壓縮1000倍！"); } } else if (length / 1024 < 10 && length / 1024 > 0) { if (compress(in, saveFile, 1)) { System.out.println("圖片壓縮1倍！"); } } } catch (Exception e) { e.printStackTrace(); } finally { in.close(); } String filename = "/Path/" + s + s + "." + suffix;//服務器地址 System.out.println(filename); int a = shopService.updateImg(u.getId(), filename); System.out.println(filename); } catch (Exception e) { e.printStackTrace(); } } else { } return "wode.html"; }

圖片處理類

package com.example.springbootshop.util; import org.junit.Test; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.awt.image.WritableRaster; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; /** * 圖片工具類，完成圖片的截取 * 全部方法返回值均未boolean型 */
public class ImageHelper { /** * 實現圖像的等比縮放 * @param source * @param targetW * @param targetH * @return */
    private static BufferedImage resize(BufferedImage source, int targetW, int targetH) { // targetW，targetH分別表示目標長和寬
        int type = source.getType(); BufferedImage target = null; double sx = (double) targetW / source.getWidth(); double sy = (double) targetH / source.getHeight(); // 這裏想實如今targetW，targetH範圍內實現等比縮放。若是不須要等比縮放 // 則將下面的if else語句註釋便可
        if (sx < sy) { sx = sy; targetW = (int) (sx * source.getWidth()); } else { sy = sx; targetH = (int) (sy * source.getHeight()); } if (type == BufferedImage.TYPE_CUSTOM) { // handmade
            ColorModel cm = source.getColorModel(); WritableRaster raster = cm.createCompatibleWritableRaster(targetW, targetH); boolean alphaPremultiplied = cm.isAlphaPremultiplied(); target = new BufferedImage(cm, raster, alphaPremultiplied, null); } else target = new BufferedImage(targetW, targetH, type); Graphics2D g = target.createGraphics(); // smoother than exlax:
 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy)); g.dispose(); return target; } /** * 實現圖像的等比縮放和縮放後的截取, 處理成功返回true, 不然返回false * @param inFilePath 要截取文件的路徑 * @param outFilePath 截取後輸出的路徑 * @param width 要截取寬度 * @param hight 要截取的高度 * @throws Exception */
    public static boolean compress(String inFilePath, String outFilePath, int width, int hight) { boolean ret = false; File file = new File(inFilePath); File saveFile = new File(outFilePath); InputStream in = null; try { in = new FileInputStream(file); ret = compress(in, saveFile, width, hight); } catch (FileNotFoundException e) { e.printStackTrace(); ret = false; } finally{ if(null != in){ try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } return ret; } /** * 實現圖像的等比縮放和縮放後的截取, 處理成功返回true, 不然返回false * @param in 要截取文件流 * @param outFilePath 截取後輸出的路徑 * @param width 要截取寬度 * @param hight 要截取的高度 * @throws Exception */
    public static boolean compress(InputStream in, File saveFile, int width, int hight) { // boolean ret = false;
        BufferedImage srcImage = null; try { srcImage = ImageIO.read(in); } catch (IOException e) { e.printStackTrace(); return false; } if (width > 0 || hight > 0) { // 原圖的大小
            int sw = srcImage.getWidth(); int sh = srcImage.getHeight(); // 若是原圖像的大小小於要縮放的圖像大小，直接將要縮放的圖像複製過去
            if (sw > width && sh > hight) { srcImage = resize(srcImage, width, hight); } else { String fileName = saveFile.getName(); String formatName = fileName.substring(fileName .lastIndexOf('.') + 1); try { ImageIO.write(srcImage, formatName, saveFile); } catch (IOException e) { e.printStackTrace(); return false; } return true; } } // 縮放後的圖像的寬和高
        int w = srcImage.getWidth(); int h = srcImage.getHeight(); // 若是縮放後的圖像和要求的圖像寬度同樣，就對縮放的圖像的高度進行截取
        if (w == width) { // 計算X軸座標
            int x = 0; int y = h / 2 - hight / 2; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } // 不然若是是縮放後的圖像的高度和要求的圖像高度同樣，就對縮放後的圖像的寬度進行截取
        else if (h == hight) { // 計算X軸座標
            int x = w / 2 - width / 2; int y = 0; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } return true; } /** * 實現圖像的等比縮放和縮放後的截取, 處理成功返回true, 不然返回false * @param in 圖片輸入流 * @param saveFile 壓縮後的圖片輸出流 * @param proportion 壓縮比 * @throws Exception */
    public static boolean compress(InputStream in, File saveFile, int proportion) { if(null == in
                ||null == saveFile ||proportion < 1){// 檢查參數有效性 //LoggerUtil.error(ImageHelper.class, "--invalid parameter, do nothing!");
            return false; } BufferedImage srcImage = null; try { srcImage = ImageIO.read(in); } catch (IOException e) { e.printStackTrace(); return false; } // 原圖的大小
        int width = srcImage.getWidth() / proportion; int hight = srcImage.getHeight() / proportion; srcImage = resize(srcImage, width, hight); // 縮放後的圖像的寬和高
        int w = srcImage.getWidth(); int h = srcImage.getHeight(); // 若是縮放後的圖像和要求的圖像寬度同樣，就對縮放的圖像的高度進行截取
        if (w == width) { // 計算X軸座標
            int x = 0; int y = h / 2 - hight / 2; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } // 不然若是是縮放後的圖像的高度和要求的圖像高度同樣，就對縮放後的圖像的寬度進行截取
        else if (h == hight) { // 計算X軸座標
            int x = w / 2 - width / 2; int y = 0; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } return true; } /** * 實現縮放後的截圖 * @param image 縮放後的圖像 * @param subImageBounds 要截取的子圖的範圍 * @param subImageFile 要保存的文件 * @throws IOException */
    private static void saveSubImage(BufferedImage image, Rectangle subImageBounds, File subImageFile) throws IOException { if (subImageBounds.x < 0 || subImageBounds.y < 0
                || subImageBounds.width - subImageBounds.x > image.getWidth() || subImageBounds.height - subImageBounds.y > image.getHeight()) { //LoggerUtil.error(ImageHelper.class, "Bad subimage bounds");
            return; } BufferedImage subImage = image.getSubimage(subImageBounds.x,subImageBounds.y, subImageBounds.width, subImageBounds.height); String fileName = subImageFile.getName(); String formatName = fileName.substring(fileName.lastIndexOf('.') + 1); ImageIO.write(subImage, formatName, subImageFile); } @Test public static void main(String[] args) throws Exception { /** * saveSubImage 截圖類的使用 * srcImage 爲BufferedImage對象 * Rectangle 爲須要截圖的長方形座標 * saveFile 須要保存的路徑及名稱 * **/
        //須要截圖的長方形座標
        /*Rectangle rect =new Rectangle(); rect.x=40; rect.y=40; rect.height=160; rect.width=160; InputStream in = null; //須要保存的路徑及名稱 File saveFile = new File("d:\\ioc\\files\\aaa2.jpg"); //須要進行處理的圖片的路徑 in = new FileInputStream(new File("d:\\ioc\\files\\aaa.jpg")); BufferedImage srcImage = null; //將輸入的數據轉爲BufferedImage對象 srcImage = ImageIO.read(in); ImageHelper img=new ImageHelper(); img.saveSubImage(srcImage, rect, saveFile);*/

        /** * compress 圖片縮放類的使用(縮略圖) * srcImage 爲InputStream對象 * Rectangle 爲須要截圖的長方形座標 * proportion 爲壓縮比例 * **/ InputStream in = null; //縮放後須要保存的路徑
        File saveFile = new File("D:\\xiangmu\\demo\\20180523192742IMG_0049123.jpg"); try { //原圖片的路徑
            in = new FileInputStream(new File("D:\\xiangmu\\demo\\20180523192742IMG_0049.jpg")); if(compress(in, saveFile, 10)){ System.out.println("圖片壓縮十倍！"); } } catch (Exception e) { e.printStackTrace(); } finally { in.close(); } } }