java input 调用手机相机和本地照片上传图片到服务器然后压缩的方法

<input type="file" accept="image/*" capture="camera"><input type="file" accept="video/*" capture="camcorder"><input type="file" accept="audio/*" capture="microphone">

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

<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>图片</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="上传" type="submit">  </div> </form>

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

<script> /*图片地址 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("最多同时只可上传9张图片");    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();*/   });  })  /* 三个参数 file：一个是文件(类型是图片格式)， w：一个是文件压缩的后宽度，宽度越小，字节越小 objDiv：一个是容器或者回调函数 photoCompress()  */  function photoCompress(file, w, objDiv) {   var ready = new FileReader();   /*开始读取指定的Blob对象或File对象中的内容. 当读取操作完成时,readyState属性的值会成为DONE,如果设置了onloadend事件处理程序,则调用之.同时,result属性中将包含一个data: URL格式的字符串以表示所读取文件的内容.*/   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>

@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 图片缩放类的使用(缩略图)     * srcImage 为InputStream对象     * Rectangle 为需要截图的长方形坐标     * proportion 为压缩比例     * **/    InputStream in = null;    //缩放后需要保存的路径    File saveFile = new File("D://xiangmu//demo//" + s + s + "." + suffix);    try {     //原图片的路径     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("图片压缩十倍！");      }     } else if (length / 1024 >= 100 && length / 1024 < 1000) {      if (compress(in, saveFile, 100)) {       System.out.println("图片压缩100倍！");      }     } else if (length / 1024 >= 1000 && length / 1024 < 10000) {      if (compress(in, saveFile, 1000)) {       System.out.println("图片压缩1000倍！");      }     } else if (length / 1024 < 10 && length / 1024 > 0) {      if (compress(in, saveFile, 1)) {       System.out.println("图片压缩1倍！");      }     }    } catch (Exception e) {     e.printStackTrace();    } finally {     in.close();    }    String filename = "/Path/" + s + s + "." + suffix;//服务器地址    System.out.println(filename);    int a = shopService.updateImg(u.getId(), filename);    System.out.println(filename);   } catch (Exception e) {    e.printStackTrace();   }  } else {  }  return "wode.html"; }

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;/** * 图片工具类，完成图片的截取 * 所有方法返回值均未boolean型 */public class ImageHelper { /**  * 实现图像的等比缩放  * @param source  * @param targetW  * @param targetH  * @return  */ private static BufferedImage resize(BufferedImage source, int targetW,          int targetH) {  // targetW，targetH分别表示目标长和宽  int type = source.getType();  BufferedImage target = null;  double sx = (double) targetW / source.getWidth();  double sy = (double) targetH / source.getHeight();  // 这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放  // 则将下面的if else语句注释即可  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; } /**  * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false  * @param inFilePath 要截取文件的路径  * @param outFilePath 截取后输出的路径  * @param width 要截取宽度  * @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; } /**  * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false  * @param in 要截取文件流  * @param outFilePath 截取后输出的路径  * @param width 要截取宽度  * @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) {   // 原图的大小   int sw = srcImage.getWidth();   int sh = srcImage.getHeight();   // 如果原图像的大小小于要缩放的图像大小，直接将要缩放的图像复制过去   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;   }  }  // 缩放后的图像的宽和高  int w = srcImage.getWidth();  int h = srcImage.getHeight();  // 如果缩放后的图像和要求的图像宽度一样，就对缩放的图像的高度进行截取  if (w == width) {   // 计算X轴坐标   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;   }  }  // 否则如果是缩放后的图像的高度和要求的图像高度一样，就对缩放后的图像的宽度进行截取  else if (h == hight) {   // 计算X轴坐标   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; } /**  * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false  * @param in 图片输入流  * @param saveFile 压缩后的图片输出流  * @param proportion 压缩比  * @throws Exception  */ public static boolean compress(InputStream in, File saveFile, int proportion) {  if(null == in    ||null == saveFile    ||proportion < 1){// 检查参数有效性   //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;  }  // 原图的大小  int width = srcImage.getWidth() / proportion;  int hight = srcImage.getHeight() / proportion;  srcImage = resize(srcImage, width, hight);  // 缩放后的图像的宽和高  int w = srcImage.getWidth();  int h = srcImage.getHeight();  // 如果缩放后的图像和要求的图像宽度一样，就对缩放的图像的高度进行截取  if (w == width) {   // 计算X轴坐标   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;   }  }  // 否则如果是缩放后的图像的高度和要求的图像高度一样，就对缩放后的图像的宽度进行截取  else if (h == hight) {   // 计算X轴坐标   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; } /**  * 实现缩放后的截图  * @param image 缩放后的图像  * @param subImageBounds 要截取的子图的范围  * @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 截图类的使用   * srcImage 为BufferedImage对象   * Rectangle 为需要截图的长方形坐标   * saveFile 需要保存的路径及名称   * **/  //需要截图的长方形坐标  /*Rectangle rect =new Rectangle();  rect.x=40;  rect.y=40;  rect.height=160;  rect.width=160;  InputStream in = null;  //需要保存的路径及名称  File saveFile = new File("d://ioc//files//aaa2.jpg");  //需要进行处理的图片的路径  in = new FileInputStream(new File("d://ioc//files//aaa.jpg"));  BufferedImage srcImage = null;  //将输入的数据转为BufferedImage对象  srcImage = ImageIO.read(in);  ImageHelper img=new ImageHelper();  img.saveSubImage(srcImage, rect, saveFile);*/  /**   * compress 图片缩放类的使用(缩略图)   * srcImage 为InputStream对象   * Rectangle 为需要截图的长方形坐标   * proportion 为压缩比例   * **/  InputStream in = null;  //缩放后需要保存的路径  File saveFile = new File("D://xiangmu//demo//20180523192742IMG_0049123.jpg");  try {   //原图片的路径   in = new FileInputStream(new File("D://xiangmu//demo//20180523192742IMG_0049.jpg"));   if(compress(in, saveFile, 10)){    System.out.println("图片压缩十倍！");   }  } catch (Exception e) {   e.printStackTrace();  } finally {   in.close();  } }}