How to save the image on the web through java code?

Suppose a picture can be loaded on the browser, and nothing
else. If I want to use a jave code to intercept the picture
and save it into a file, what does the code look like? I know
the URL of the picture. Thanks.

Hi. Running your code, I got the following, with the URL as:
String dir = "http://california.biocars.org/viewFrames2.php?";
String fileName = "r=840190844&fn=/data/pub/kb030129_fp_2_001.img&xsize=512&ysize=512&zoom=1&contrast=2048&xcen=0.5&ycen=0.5&wval=0&jpq=100";
String urlName = dir+fileName;
URL imageURL = new URL(urlName);
So something wrong? This output does not look like anything
of a jpeg file. Thanks.
==================================================
<html>
<head>
<TITLE> View BioCARS Data </TITLE>
<META name='Author' content='Keith Brister'>
<META HTTP-EQUIV="expires" CONTENT="0">
</head>
<body bgcolor=#ccffff>
<form action=/viewFrames2.php method=POST><input type=hidden name=oldZoom value=1><input type=hidden name=xcen value=0.5><input type=hidden name=ycen value=0.5>
<input type=hidden name=theTrip value=0>
<table>
<tr><td valign=top><table>
<tr><td width=128 height=128><a href="/viewFrames2.php?theState=a:7:{s:4:xcen";s:3:"0.5";s:4:"ycen";s:3:"0.5";s:4:"zoom";s:1:"1";s:13:"autoZoomLevel";i:16;s:5:"azcco";i:0;s:8:"contrast";i:2048;s:6:"wvalue";i:0;&theTXYZ="><img ismap border=0 width=128 height=128 src=imageServer2.php?r=159196106&fn=/&xsize=128&ysize=128&zoom=1&contrast=2048&xcen=0.5&ycen=0.5&wval=0&jpq=100&thumbnail=1></a></td></tr><tr><td><input type=text name=seqDir value=""></td></tr><tr><td><input type=text name=fFileName value=""></td></tr></table></td>
<td><table border=1 cellpadding=0 cellspacing=0><tr><td width=512 height=512><a href="/viewFrames2.php?theState=a:7:{s:4:"xcen";s:3:"0.5";s:4:"ycen";s:3:"0.5";s:4:"zoom";s:1:"1";s:13:"autoZoomLevel";i:16;s:5:"azcco";i:0;s:8:"contrast";i:2048;s:6:"wvalue";i:0;}&theXYZ="><img ismap border=0 width=512 height=512 src=imageServer2.php?r=159196106&fn=/&xsize=512&ysize=512&zoom=1&contrast=2048&xcen=0.5&ycen=0.5&wval=0&jpq=100></a></td><td width=8 length=512><a href="/viewFrames2.php?theState=a:7:{s:4:"xcen";s:3:"0.5";s:4:"ycen";s:3:"0.5";s:4:"zoom";s:1:"1";s:13:"autoZoomLevel";i:16;s:5:"azcco";i:0;s:8:"contrast";i:2048;s:6:"wvalue";i:0;}&bMapVal="><img ismap alt='Set Black Value' width=8 length=512 border=0 src=pixselect.php?r=159196106&bVal=2048&wVal=0&minVal=0></a></td>
<td width=8 length=512><a href="/viewFrames2.php?theState=a:7:{s:4:"xcen";s:3:"0.5";s:4:"ycen";s:3:"0.5";s:4:"zoom";s:1:"1";s:13:"autoZoomLevel";i:16;s:5:"azcco";i:0;s:8:"contrast";i:2048;s:6:"wvalue";i:0;}&wMapVal="><img ismap alt='Set White Value' width=8 length=512 border=0 src=pixselect.php?r=159196106&bVal=2048&wVal=0&maxVal=2048></a></td><td valign=top><table><tr><td><input type=submit name=subbieResetXYZ value='Reset Zoom and Center'></td></tr><tr><td><input type=submit name=subbieZoomIn value='Zoom In'> <input type=submit name=subbieZoomOut value='Zoom Out'></td></tr><tr><td><table border=1><tr><td align=right>Auto Zoom and Center:</td><td><input onClick='this.form.submit();' type=radio name=azcco value=0 checked></td></tr>
<tr><td align=right>Center Only:</td><td><input onClick='this.form.submit();' type=radio name=azcco value=1 ></td></tr>
</table></td></tr>

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