java读取JPEG中exif中信息

 

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。

具体实现的代码如下：

 

package com.drew.metadata;  
  
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。

 

package com.drew.metadata;  
  
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;  
    }  
}  

 

 

 

通过以上代码就能得到图片中的exif信息。

 

补充：软件开发 , Java ,