一般情况下是java程序读取不到gps等扩展信息的。如果想要解析到里面的信息需要下载一个jar包，metadata-extractor-2.6.4.jar(下载地址：

http://code.google.com/p/metadata-extractor/)，这个jar提供了支持获取扩展信息的功能。

import java.io.File;

import java.io.IOException;

import com.drew.imaging.ImageMetadataReader;

import com.drew.imaging.ImageProcessingException;

public class SampleUsage

{

/**

* 图片信息获取metadata元数据信息

* @param fileName 需要解析的文件

* @return

*/

public ImgInfoBean parseImgInfo (String fileName)

{

File file = new File(fileName);

ImgInfoBean imgInfoBean = null;

try {

Metadata metadata = ImageMetadataReader.readMetadata(file);

imgInfoBean = printImageTags(file, metadata);

} catch (ImageProcessingException e) {

System.err.println("error 1a: " + e);

} catch (IOException e) {

System.err.println("error 1b: " + e);

}

return imgInfoBean;

}

/**

* 读取metadata里面的信息

* @param sourceFile 源文件

* @param metadata metadata元数据信息

* @return

*/

private ImgInfoBean printImageTags(File sourceFile, Metadata metadata)

{

ImgInfoBean imgInfoBean = new ImgInfoBean ();

imgInfoBean.setImgSize(sourceFile.getTotalSpace());

imgInfoBean.setImgName(sourceFile.getName());

for (Directory directory : metadata.getDirectories()) {

for (Tag tag : directory.getTags()) {

String tagName = tag.getTagName();

String desc = tag.getDescription();

if (tagName.equals("Image Height")) {

//图片高度

imgInfoBean.setImgHeight(desc);

} else if (tagName.equals("Image Width")) {

//图片宽度

imgInfoBean.setImgWidth(desc);

} else if (tagName.equals("Date/Time Original")) {

//拍摄时间

imgInfoBean.setDateTime(desc);

} else if (tagName.equals("GPS Altitude")) {

//海拔

imgInfoBean.setAltitude(desc);

} else if (tagName.equals("GPS Latitude")) {

//纬度

imgInfoBean.setLatitude(pointToLatlong(desc));

} else if (tagName.equals("GPS Longitude")) {

//经度

imgInfoBean.setLongitude(pointToLatlong(desc));

}

}

for (String error : directory.getErrors()){

System.err.println("ERROR: " + error);

}

}

return imgInfoBean;

}

/**

* 经纬度转换 度分秒转换

* @param point 坐标点

* @return

*/

public String pointToLatlong (String point ) {

Double du = Double.parseDouble(point.substring(0, point.indexOf("°")).trim());

Double fen = Double.parseDouble(point.substring(point.indexOf("°")+1, point.indexOf("'")).trim());

Double miao = Double.parseDouble(point.substring(point.indexOf("'")+1, point.indexOf("\"")).trim());

Double duStr = du + fen / 60 + miao / 60 / 60 ;

return duStr.toString();

}

public static void main(String[] args)

{

ImgInfoBean imgInfoBean = new SampleUsage().parseImgInfo("C:\\DSC_4564.JPG");

System.out.println(imgInfoBean.toString());

}

}

文件信息bean类。

public class ImgInfoBean {

private String imgHeight ;//图片高度

private String imgWidth ;//图片宽度

private String dateTime ;//拍摄时间

private String altitude ;//海拔

private String latitude;//纬度

private String longitude ;//经度

private Long imgSize; //文件大小

private String imgName; //文件名称

public Long getImgSize() {

return imgSize;

}

public void setImgSize(Long imgSize) {

this.imgSize = imgSize;

}

public String getImgName() {

return imgName;

}

public void setImgName(String imgName) {

this.imgName = imgName;

}

public String getImgHeight() {

return imgHeight;

}

public void setImgHeight(String imgHeight) {

this.imgHeight = imgHeight;

}

public String getImgWidth() {

return imgWidth;

}

public void setImgWidth(String imgWidth) {

this.imgWidth = imgWidth;

}

public String getDateTime() {

return dateTime;

}

public void setDateTime(String dateTime) {

this.dateTime = dateTime;

}

public String getAltitude() {

return altitude;

}

public void setAltitude(String altitude) {

this.altitude = altitude;

}

public String getLatitude() {

return latitude;

}

public void setLatitude(String latitude) {

this.latitude = latitude;

}

public String getLongitude() {

return longitude;

}

public void setLongitude(String longitude) {

this.longitude = longitude;

}

public String toString (){

return "[图片信息]文件名称："+ this.imgName+" 文件大小："+this.imgSize +" 高度："+this.imgHeight+" 宽度："+this.imgWidth+" 拍摄时间："+this.dateTime+" 海拔："+this.altitude+" 纬度："+this.latitude+" 经度："+this.longitude;

}

}