JSP: Call servlet Display Image
Since I work needs, I started learning Java and JSP. I will write more articles about JSP for this time to strengthen my understanding of JSP.
This article mainly introduces how to call servlet to display pictures, actually let you know how to output binary data to the client.
Under this 1.HTM used to call servlet
Show photos </ title> </ head></p>
<p><body></p>
<p><img src = "http: // localhost: 8080 / servlet / showimage></p>
<p></ body></p>
<p></ html></p>
<p><! ------------ Document 1.htm end ----------------></p>
<p>In the servlet, it relys on the get post method by doget (), dopost (), etc., where we respond to GET, so a doget () method is defined below is the source program:</p>
<p>/ / ====================== =================================================================================================================================== ==============</p>
<p>On only HTML call</p>
<p>Import java.io. *;</p>
<p>Import java.text. *;</p>
<p>Import java.util. *;</p>
<p>Import javax.servlet. *;</p>
<p>Import javax.servlet.http. *;</p>
<p>Public class showimage extends httpservlet {</p>
<p>Public void doget (httpservletRequest Req, httpservletResponse res)</p>
<p>Throws ServleTexception, IOException</p>
<p>{</p>
<p>Try {</p>
<p>FileInputStream Hfile = New FileInputStream ("D: //1.gif"); // Open files in the way by BYTE stream D: /1.gif</p>
<p>INT i = hfile.available (); // Get file size</p>
<p>Byte data [] = new byte [i];</p>
<p>Hfile.read (data); // read data</p>
<p>Hfile.close ();</p>
<p>Res.SetContentType ("image / *"); // Set the file type returned</p>
<p>OutputStream Toclient = Res. GetOutputStream (); // Get objects to the client output binary data</p>
<p>TOCLIENT.WRITE (data); // Output Data</p>
<p>TOCLIENT.CLOSE ();</p>
<p>}</p>
<p>Catch (IOException E) // Error Process</p>
<p>{</p>
<p>PrintWriter TOCLIENT = Res. Getwriter (); // Get objects to the client output text</p>
<p>Res.SetContentType ("text / html; charSet = GB2312");</p>
<p>TOCLIENT.WRITE ("Unable to open the picture!");</p>
<p>TOCLIENT.CLOSE ();</p>
<p>}</p>
<p>}</p></div><div class="text-center mt-3 text-grey">
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var debug = DEBUG = 0;
var url_rewrite_on = 1;
var url_path = './';
var forumarr = {"1":"Tech"};
var fid = 1;
var uid = 0;
var gid = 0;
xn.options.water_image_url = 'view/img/water-small.png';
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jsubmit.button('reset');
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return false;
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function resize_image() {
var jmessagelist = $('div.message');
var first_width = jmessagelist.width();
jmessagelist.each(function() {
var jdiv = $(this);
var maxwidth = jdiv.attr('isfirst') ? first_width : jdiv.width();
var jmessage_width = Math.min(jdiv.width(), maxwidth);
jdiv.find('img, embed, iframe, video').each(function() {
var jimg = $(this);
var img_width = this.org_width;
var img_height = this.org_height;
if(!img_width) {
var img_width = jimg.attr('width');
var img_height = jimg.attr('height');
this.org_width = img_width;
this.org_height = img_height;
}
if(img_width > jmessage_width) {
if(this.tagName == 'IMG') {
jimg.width(jmessage_width);
jimg.css('height', 'auto');
jimg.css('cursor', 'pointer');
jimg.on('click', function() {
});
} else {
jimg.width(jmessage_width);
var height = (img_height / img_width) * jimg.width();
jimg.height(height);
}
}
});
});
}
function resize_table() {
$('div.message').each(function() {
var jdiv = $(this);
jdiv.find('table').addClass('table').wrap('<div class="table-responsive"></div>');
});
}
$(function() {
resize_image();
resize_table();
$(window).on('resize', resize_image);
});
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$('#nav li[data-active="fid-1"]').addClass('active');
</script>
