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

在微信公众号里面需要上传头像，时间比较紧，调用学习jssdk并使用 来不及 就用了input

1、使用input：file标签, 去调用系统默认相机，摄像，录音功能，其实是有个capture属性，直接说明需要调用什么功能

= 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";
 }

图片处理类

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;






public class ImageHelper {
 
 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;
 }

 
 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;
 }

 
 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;
 }

 
 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;
 }

 
 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 {

  
  //需要截图的长方形坐标
  

  
  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();
  }
 }
}

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