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

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

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

capture表示，可以捕获到系统默认的设备，比如：camera--照相机；camcorder--摄像机；microphone--录音。

accept表示，直接打开系统文件目录。

2、input:file标签还支持一个multiple属性，表示可以支持多选，如：

加上这个multiple后，capture就没啥用了，因为multiple是专门用来支持多选的。

用form表单提交

图片

上传之后图片显示在页面上

js

后台接收以及压缩

@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();

StriYAGkZcJGng 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";

}

图片处理类

package com.example.springbootshop.util;

import org.junit.Test;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import jaYAGkZcJGva.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 alphaPremultipliehttp://d = 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();

}

}

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。