java压缩图片大小不改变图片分辨率-java如何实现压缩图片且保留图片原文件属性，比如拍摄日期

您转换的是图片的后缀名吧?您这样的方式已经把图片的信息删除了!

您去下载一个java图片压缩器吧

或者直接在Java下编辑代码来实习转换

package ;

import ;

import ;

import ;

import ;

import ;

import ;

import ;

import ;

import ;

/**

* 图片工具类

* 压缩图片大小

* @author Cyw

* @version 1.0

*/

public class ZIPImage {

private File file = null;

private String outPutFilePath;

private String inPutFilePath;

private String inPutFileName;

private boolean autoBuildFileName;

private String outPutFileName;

private int outPutFileWidth = 100; // 默认输出图片宽

private int outPutFileHeight = 100; // 默认输出图片高

private static boolean isScaleZoom = true; // 是否按比例缩放

public ZIPImage() {

outPutFilePath = "";

inPutFilePath = "";

inPutFileName = "";

autoBuildFileName = true;

outPutFileName = "";

}

/**

*

* @param ipfp

* 源文件夹路径

* @param ipfn

* 源文件名

* @param opfp

* 目标文件路径

* @param opfn

* 目标文件名

*/

public ZIPImage(String ipfp, String ipfn, String opfp, String opfn) {

outPutFilePath = opfp;

inPutFilePath = ipfp;

inPutFileName = ipfn;

autoBuildFileName = true;

outPutFileName = opfn;

}

/**

*

* @param ipfp

* 源文件夹路径

* @param ipfn

* 源文件名

* @param opfp

* 目标文件路径

* @param opfn

* 目标文件名

* @param aBFN

* 是否自动生成目标文件名

*/

public ZIPImage(String ipfp, String ipfn, String opfp, String opfn,

boolean aBFN) {

outPutFilePath = opfp;

inPutFilePath = ipfp;

inPutFileName = ipfn;

autoBuildFileName = aBFN;

outPutFileName = opfn;

}

public boolean isAutoBuildFileName() {

return autoBuildFileName;

}

public void setAutoBuildFileName(boolean autoBuildFileName) {

= autoBuildFileName;

}

public String getInPutFilePath() {

return inPutFilePath;

}

public void setInPutFilePath(String inPutFilePath) {

= inPutFilePath;

}

public String getOutPutFileName() {

return outPutFileName;

}

public void setOutPutFileName(String outPutFileName) {

= outPutFileName;

}

public String getOutPutFilePath() {

return outPutFilePath;

}

public void setOutPutFilePath(String outPutFilePath) {

= outPutFilePath;

}

public int getOutPutFileHeight() {

return outPutFileHeight;

}

public void setOutPutFileHeight(int outPutFileHeight) {

= outPutFileHeight;

}

public int getOutPutFileWidth() {

return outPutFileWidth;

}

public void setOutPutFileWidth(int outPutFileWidth) {

= outPutFileWidth;

}

public boolean isScaleZoom() {

return isScaleZoom;

}

public void setScaleZoom(boolean isScaleZoom) {

= isScaleZoom;

}

public String getInPutFileName() {

return inPutFileName;

}

public void setInPutFileName(String inPutFileName) {

= inPutFileName;

}

/**

* 压缩图片大小

*

* @return boolean

*/

public boolean compressImage() {

boolean flag = false;

try {

if (().equals("")) {

throw new NullPointerException("源文件夹路径不存在。");

}

if (().equals("")) {

throw new NullPointerException("图片文件路径不存在。");

}

if (().equals("")) {

throw new NullPointerException("目标文件夹路径地址为空。");

} else {

if (!(outPutFilePath)) {

throw new FileNotFoundException(outPutFilePath

+ " 文件夹创建失败!");

}

}

if () { // 自动生成文件名

String tempFile[] = getFileNameAndExtName(inPutFileName);

outPutFileName = tempFile[0] + "_cyw." + tempFile[1];

compressPic();

} else {

if (().equals("")) {

throw new NullPointerException("目标文件名为空。");

}

compressPic();

}

} catch (Exception e) {

flag = false;

e.printStackTrace();

return flag;

}

return flag;

}

// 图片处理

private void compressPic() throws Exception {

try {

// 获得源文件

file = new File(inPutFilePath + inPutFileName);

if (!()) {

throw new FileNotFoundException(inPutFilePath + inPutFileName

+ " 文件不存在!");

}

Image img = (file);

// 判断图片格式是否正确

if ((null) == -1) {

throw new Exception("文件不可读!");

} else {

int newWidth;

int newHeight;

// 判断是否是等比缩放

if ( == true) {

// 为等比缩放计算输出的图片宽度及高度

double rate1 = ((double) (null))

/ (double) outPutFileWidth + 0.1;

double rate2 = ((double) (null))

/ (double) outPutFileHeight + 0.1;

// 根据缩放比率大的进行缩放控制

double rate = rate1 > rate2 ? rate1 : rate2;

newWidth = (int) (((double) (null)) / rate);

newHeight = (int) (((double) (null)) / rate);

} else {

newWidth = outPutFileWidth; // 输出的图片宽度

newHeight = outPutFileHeight; // 输出的图片高度

}

BufferedImage tag = new BufferedImage((int) newWidth,

(int) newHeight, _INT_RGB);

/*

* _SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢

*/

().drawImage(

(newWidth, newHeight,

_SMOOTH), 0, 0, null);

FileOutputStream out = new FileOutputStream(outPutFilePath

+ outPutFileName);

JPEGImageEncoder encoder = (out);

(tag);

();

}

} catch (IOException ex) {

();

}

}

/**

* 创建文件夹目录

*

* @param filePath

* @return

* @throws Exception

*/

@SuppressWarnings("unused")

private static boolean mddir(String filePath) throws Exception {

boolean flag = false;

File f = new File(filePath);

if (!f.exists()) {

flag = f.mkdirs();

} else {

flag = true;

}

return flag;

}

/**

* 获得文件名和扩展名

*

* @param fullFileName

* @return

* @throws Exception

*/

private String[] getFileNameAndExtName(String fullFileName)

throws Exception {

String[] fileNames = new String[2];

if ((".") == -1) {

throw new Exception("源文件名不正确!");

} else {

fileNames[0] = (0, fullFileName

.lastIndexOf("."));

fileNames[1] = fullFileName

.substring((".") + 1);

}

return fileNames;

}

public Image getSourceImage() throws IOException{

//获得源文件

file = new File(inPutFilePath + inPutFileName);

if (!()) {

throw new FileNotFoundException(inPutFilePath + inPutFileName

+ " 文件不存在!");

}

Image img = (file);

return img;

}

/*

* 获得图片大小

* @path :图片路径

*/

public long getPicSize(String path) {

File file = new File(path);

return ();

}

}

//下面是测试程序

package ;

import ;

import ;

public class ImageTest {

public static void main(String[] args) throws IOException {

ZIPImage zip=new ZIPImage("d:\\","1.jpg","d:\\test\\","处理后的图片.jpg",false);

(1000);

(1000);

Image image=();

long size=("d:\\1.jpg");

("处理前的图片大小 width:"+(null));

("处理前的图片大小 height:"+(null));

("处理前的图片容量:"+ size +" bit");

();

}

}

ImageWriter writer; // 自己获取 ImageWriter 对象

ImageWriteParam iwp = ();

(_EXPLICIT);

// 参数为0和1

// 1表示设置最小的压缩以保持最大的图片质量

(1);

File file = new File(OUTPUTFILE);

FileImageOutputStream output = new FileImageOutputStream(file);

(output);

IIOImage image = new IIOImage(BUFFEREDIMAGE, null, null);

// 写入图片

(null, image, iwp);

()

问了一下我远标教育的哥们,希望对你有用!

import ;

import ;

import ;

import ;

import ;

import ;public class Zip {

// 压缩

public static void zip(String zipFileName, String inputFile)

throws Exception {

File f = new File(inputFile);

ZipOutputStream out = new ZipOutputStream(new FileOutputStream(

zipFileName));

zip(out, f, null);

("zip done");

();

} private static void zip(ZipOutputStream out, File f, String base)

throws Exception {

("zipping " + f.getAbsolutePath());

if (f != null && f.isDirectory()) {

File[] fc = f.listFiles();

if (base != null)

(new ZipEntry(base + "/"));

base = base == null ? "" : base + "/";

for (int i = 0; i < ; i++) {

zip(out, fc[i], base + fc[i].getName());

}

} else {

(new ZipEntry(base));

FileInputStream in = new FileInputStream(f);

int b;

while ((b = ()) != -1)

(b);

();

}

} // 解压

public static void unzip(String zipFileName, String outputDirectory)

throws Exception {

ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));

ZipEntry z;

while ((z = ()) != null) {

String name = z.getName();

if (z.isDirectory()) {

name = (0, () - 1);

File f = new File(outputDirectory + + name);

f.mkdir();

("MD " + outputDirectory +

+ name);

} else {

("unziping " + z.getName());

File f = new File(outputDirectory + + name);

f.createNewFile();

FileOutputStream out = new FileOutputStream(f);

int b;

while ((b = ()) != -1)

(b);

();

}

}

();

} public void deleteFolder(File dir) {

File filelist[] = ();

int listlen = ;

for (int i = 0; i < listlen; i++) {

if (filelist[i].isDirectory()) {

deleteFolder(filelist[i]);

} else {

filelist[i].delete();

}

}

();// 删除当前目录

} public static void main(String[] args) {

try {

// TestZip t = new TestZip();

// t.zip("c:\\","c:\\test");

// t.unzip("c:\\","c:\\test2");

} catch (Exception e) {

e.printStackTrace();

}

}

}