package com.want.util;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
/**
* * @author WQ * @date 2011-01-14 * @versions 1.0 图片压缩工具类 提供的方法中可以设定生成的
* 缩略图片的大小尺寸等
*/
public class ImgCompress {
public static File thefiles = null;
/** * 图片文件读取 * * @param srcImgPath * @return
* @throws Exception */
public static BufferedImage InputImage(String srcImgPath) throws Exception {
BufferedImage srcImage = null;
FileInputStream in = new FileInputStream(srcImgPath);
srcImage = javax.imageio.ImageIO.read(in);
return srcImage;
}
// public static void main(String args[]) {
// try {
// //获取文件路径可有多张图片
// Map<Integer, String> map = readfile("C:/Users/liquan/Desktop/img", null);
//循环遍历Map
// for (int i = 0; i < map.size(); i++) {
// System.out.println(map.get(i) + " ==" + i);
// System.out.println();
// String oldpath = map.get(i);
// compressImage(map.get(i), "C:/Users/liquan/Desktop/ii/ii_" + i + ".jpg", 100, 100);
// }
// } catch (Exception ex) {
// }
// System.out.println("ok");
//单张图片压缩 初始文件路径 输出文件路径 宽 高
//这个图片类型是能改的 什么格式都可以读出，都可以写成其他类型
// try {
// compressImage("/Users/00310978/Desktop/img/", "/Users/00310978/Desktop/img/compress/屏幕快照 2017-04-19 下午2.10.59.png");
// } catch (Exception e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
// System.out.println("OK");
// }
/**
* * 将图片按照指定的图片尺寸压缩 * * @param srcImgPath :源图片路径 * @param outImgPath *
* :输出的压缩图片的路径 * @param new_w * :压缩后的图片宽 * @param new_h * :压缩后的图片高
* @throws Exception
*/
public static void compressImage(String srcImgPath, String outImgPath
) throws Exception {
//更改后文件宽
int new_w = 0;
//更改后文件宽
int new_h = 0;
//源文件宽
int ynew_w = 0;
//原文件高
int ynew_h = 0;
File file = new File(srcImgPath);
try {
BufferedImage sourceImg =ImageIO.read(new FileInputStream(file));
//获取源文件宽
ynew_w=sourceImg.getWidth();
//获取源文件高
ynew_h = sourceImg.getHeight();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//获取文件大小
long size =file.length();
//小于50K图片大小不变
if(size<51200){
new_w=ynew_w;
new_h=ynew_h;
//大于等于50K小于1M缩小为原图片的0.8倍
}else if(81920<=size&&size<1048576){
new_w = (int)Math.floor(ynew_w*0.8);
new_h = (int)Math.floor(ynew_h*0.8);
//大于等于1M小于3M缩小为原图片的0.45倍
}else if(1048576<=size &&size<3145728){
new_w = (int)Math.floor(ynew_w*0.5);
new_h = (int)Math.floor(ynew_h*0.5);
//大于等于3M缩小于8M为原图片的0.35倍
}else if(3145728<=size && size<8388608){
new_w = (int)Math.floor(ynew_w*0.35);
new_h = (int)Math.floor(ynew_h*0.35);
//大于等于8M缩为原图片的0.2倍
}else if(8388608<=size){
new_w = (int)Math.floor(ynew_w*0.2);
new_h = (int)Math.floor(ynew_h*0.2);
}
BufferedImage src = InputImage(srcImgPath);
disposeImage(src, outImgPath, new_w, new_h);
}
/**
* * 指定长或者宽的最大值来压缩图片 * * @param srcImgPath * :源图片路径 * @param outImgPath *
* :输出的压缩图片的路径 * @param maxLength * :长或者宽的最大值
* @throws Exception
*/
public static void compressImage(String srcImgPath, String outImgPath,
int maxLength) throws Exception {
// 得到图片
BufferedImage src = InputImage(srcImgPath);
if (null != src) {
int old_w = src.getWidth();
// 得到源图宽
int old_h = src.getHeight();
// 得到源图长
int new_w = 0;
// 新图的宽
int new_h = 0;
// 新图的长
// 根据图片尺寸压缩比得到新图的尺寸
if (old_w > old_h) {
// 图片要缩放的比例
new_w = maxLength;
new_h = (int) Math.round(old_h * ((float) maxLength / old_w));
} else {
new_w = (int) Math.round(old_w * ((float) maxLength / old_h));
new_h = maxLength;
}
disposeImage(src, outImgPath, new_w, new_h);
}
}
/** * 处理图片 * * @param src * @param outImgPath * @param new_w * @param new_h */
private synchronized static void disposeImage(BufferedImage src,
String outImgPath, int new_w, int new_h) {
// 得到图片
int old_w = src.getWidth();
// 得到源图宽
int old_h = src.getHeight();
// 得到源图长
BufferedImage newImg = null;
// 判断输入图片的类型
switch (src.getType()) {
case 13:
// png,gifnewImg = new BufferedImage(new_w, new_h,
// BufferedImage.TYPE_4BYTE_ABGR);
break;
default:
newImg = new BufferedImage(new_w, new_h, BufferedImage.TYPE_INT_RGB);
break;
}
Graphics2D g = newImg.createGraphics();
// 从原图上取颜色绘制新图
g.drawImage(src, 0, 0, old_w, old_h, null);
g.dispose();
// 根据图片尺寸压缩比得到新图的尺寸
newImg.getGraphics().drawImage(
src.getScaledInstance(new_w, new_h, Image.SCALE_SMOOTH), 0, 0,
null);
// 调用方法输出图片文件
OutImage(outImgPath, newImg);
}
/**
* * 将图片文件输出到指定的路径，并可设定压缩质量 * * @param outImgPath * @param newImg * @param
* per
*/
private static void OutImage(String outImgPath, BufferedImage newImg) {
// 判断输出的文件夹路径是否存在，不存在则创建
File file = new File(outImgPath);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}// 输出到文件流
try {
thefiles = file;
ImageIO.write(newImg,
outImgPath.substring(outImgPath.lastIndexOf(".") + 1),
new File(outImgPath));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 获取路径里面照片路径
* @param filepath
* @param pathMap
* @return
* @throws Exception
*/
public static Map<Integer, String> readfile(String filepath,
Map<Integer, String> pathMap) throws Exception {
if (pathMap == null) {
pathMap = new HashMap<Integer, String>();
}
File file = new File(filepath);
// 文件
if (!file.isDirectory()) {
pathMap.put(pathMap.size(), file.getPath());
} else if (file.isDirectory()) { // 如果是目录， 遍历所有子目录取出所有文件名
String[] filelist = file.list();
for (int i = 0; i < filelist.length; i++) {
File readfile = new File(filepath + "/" + filelist[i]);
if (!readfile.isDirectory()) {
pathMap.put(pathMap.size(), readfile.getPath());
} else if (readfile.isDirectory()) { // 子目录的目录
readfile(filepath + "/" + filelist[i], pathMap);
}
}
}
return pathMap;
}
}
