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  1. 02-23-2010, 09:06 AM #1
    Ginkan
    Ginkan is offline Member
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    Default How to use and print the JAVA code from a JSP

    hi all, im new to JSP, i want to write a JSP that can read the exif infomation from JPEG,
    1)how can i use the $path in <%!
    2)how can i print the data from <%!
    thank U & sorry for my poor english!

    script︰

    Java Code: 
    <%@ page language="java" contentType="text/html; charset=big5" import="java.util.*, java.io.*"%>

<%@ page import="com.drew.metadata.*"%>
<%@ page import="com.drew.metadata.exif.*"%>
<%@ page import="com.drew.imaging.jpeg.JpegProcessingException"%>

<%
Date $date= new Date();
String $patha=new File(application.getRealPath("/")).getParent();
String $pathb=new File(request.getRequestURI()).getParent();
String $path=$patha+$pathb+"\\";
%>
<!-- client comment, time: <%=$date%> -->

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=big5">
<title>JSP Try - 05_exif</title>
</head>
<body>

<%!
public static void main(String args[]) throws FileNotFoundException {
[color=red][b]File f = new File("X:/xxx/xxx.JPG");[/b]
/*1）Can i change to the following line︰
[b]File f = new File($path +"xxx.JPG");*/[/b][/color]
try {
ExifReader er = new ExifReaderRose;
Metadata exif = er.extract();
Iterator itr = exif.getDirectoryIterator();
while (itr.hasNext()) {
Directory directory = (Directory) itr.next();

[color=red]
/*2）How to print the following lines︰*/
System.out.println("EXIF版本：" + directory.getString(ExifDirectory.TAG_EXIF_VERSION));
System.out.println(" 相機品牌：" + directory.getString(ExifDirectory.TAG_MAKE));
System.out.println(" 像機號碼：" + directory.getString(ExifDirectory.TAG_MODEL));
System.out.println(" 光圈值：" + directory.getString(ExifDirectory.TAG_FNUMBER));
System.out.println(" 快門：" + directory.getString(ExifDirectory.TAG_EXPOSURE_TIME));
System.out.println(" 感光度：" + directory.getString(ExifDirectory.TAG_ISO_EQUIVALENT));
System.out.println(" 軟件：" + directory.getString(ExifDirectory.TAG_SOFTWARE));
System.out.println(" 原始拍攝時間：" + directory.getString(ExifDirectory.TAG_DATETIME_ORIGINAL));
System.out.println(" 數字化時間：" + directory.getString(ExifDirectory.TAG_DATETIME_DIGITIZED));
System.out.println(" 方向：" + directory.getString(ExifDirectory.TAG_ORIENTATION));
System.out.println(" 圖片寬度：" + directory.getString(ExifDirectory.TAG_EXIF_IMAGE_WIDTH));
System.out.println(" 圖片高度：" + directory.getString(ExifDirectory.TAG_EXIF_IMAGE_HEIGHT));
System.out.println(" 水平分辨率：" + directory.getString(ExifDirectory.TAG_X_RESOLUTION));
System.out.println(" 垂直分辨率：" + directory.getString(ExifDirectory.TAG_Y_RESOLUTION));
System.out.println(" 垂直分辨率：" + directory.getString(ExifDirectory.TAG_EXPOSURE_BIAS));
[/color]
break;
}
} catch (JpegProcessingException e) {
System.err.println("This is not a JPEG - 這不是JPEG檔");
}
}

%>

</body>
</html>
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  2. 02-23-2010, 02:05 PM #2
    FON
    FON is offline Senior Member
    Join Date
    Dec 2009
    Location
    Belgrade, Serbia
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    Default

    Do you know what are JSP Implicit Objects?

    Try this scriptlet in your JSP:

    Java Code: 
    <% 
out.print("Hello World");
%>
    "Out: denotes the Output stream in the context of page. The class or the interface name of the Out object is jsp.JspWriter. The Out object is written: Javax.servlet.jsp.JspWriter"

    They end up visible in the browser requesting the JSP page, not in
    java console as System.out.println(...)

    TIP:
    Writing code in scriptlets is bad habit. Use tags instead.
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