My system: JSP STRTUS EJB DAO DB
My Idea: In the Action (Ro Dispatchction), the parameters needed to report the report, then pass to the unified display servlet
My implementation
1. Show servlet
2. Parameter Class
3.Action
1. Show servlets (HTML here)
Public class jrhtmlservlet extends httpservlet {
/ **
*
* /
Public void service
HTTPSERVLETREQUEST REQUEST,
HTTPSERVLETRESPONSE RESPONSE
"Throws oException, servletexception {
// Get the required parameters
JRPARAMETERFACE JREPORTPARAM = NULL;
JreportParam = (JRPARAMETERFACE) Request.GetaTribute ("jreportparam");
Response.setContentType ("text / html; charSet = GB2312");
PrintWriter out = response.getwriter ();
Try
{
JasperReport JasperReport = (JasperReport) JRLOADER.LOADOBJECT (JREPORTPARAM.GETJASPERFILE (). Getpath ());
JasperPrint JasperPrint =
JasperfillManager.FillReport
JasperReport,
Jreportparam.getParameters (),
Jreportparam.getdataSet ()
);
JRHTMLEXPORTER EXPORTER = New JRHTMLEXPORTER ();
Map imagesmap = new hashmap ();
Request.getations (). SetaTribute ("iMages_map", ImageSmap;
Exporter.SetParameter (JrexporterParameter.jasper_Print, Jasperprint);
Exporter.SetParameter (JrexporterParameter.output_Writer, Out);
Exporter.SetParameter (JRHTMLEXPORTERPARETER.IMAGES_MAP, IMAGESMAP);
Exporter.SetParameter (JRHTMLEXPORTERPARETER.IMAGES_URI, "JRREPORT / IMAGE? Image =");
Exporter.exportReport ();
}
Catch (JRException E)
{
Out.println ("");
Out.println ("
");
Out.println ("
JasperReports - Web Application Sample>");</p>
<p>// out.println ("<link rel = /" stylesheet / "type = /" text / css / "href = /" ../ style = / "style /"> "); OUT. Println ("</ HEAD>");</p>
<p>Out.println ("<body bgcolor = /" white / ">");</p>
<p>Out.println ("<span class = /" bnew / "> jasperreports encountered this error: </ span>");</p>
<p>OUT.PRINTLN ("<pre>");</p>
<p>E.PrintStackTrace (OUT);</p>
<p>OUT.PRINTLN ("</ pre>");</p>
<p>Out.println ("</ Body>");</p>
<p>Out.println ("</ html>");</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>2. Parameter Class</p>
<p>Public interface jrparameterinterinterface {</p>
<p>// set required parameters</p>
<p>Void setParameters (Object Object, Object Object1);</p>
<p>/ / Return the required file</p>
<p>File getjasperfile ();</p>
<p>/ / Back to page of Parameter</p>
<p>Map getparameters ();</p>
<p>/ / Return to the page of the page, if you are empty, return (New JREMPTYDATASOURCE ()), otherwise return (New WebAppdataSource (DATA))</p>
<p>JRDataSource getDataSet ();</p>
<p>}</p>
<p>Implementation</p>
<p>Public Class JreportParam IMPLEments JRPARETERFACE {</p>
<p>Private Dataset JRDATA;</p>
<p>PRIVATE JASPERFILE;</p>
<p>Private JrdataSource JrdataSource;</p>
<p>Private map parametermap;</p>
<p>Public JreportParam (File Jasperfile, Dataset Data) {</p>
<p>THIS.JASPERFILE = JASPERFILE;</p>
<p>JRDATA = DATA;</p>
<p>Parametermap = new hashmap ();</p>
<p>}</p>
<p>Public JreportParam (File Jasperfile) {</p>
<p>THIS (Jasperfile, (Dataset) NULL;</p>
<p>}</p>
<p>Public JreportParam (File Jasperfile, JRDataSource Jrdata) {</p>
<p>THIS.JASPERFILE = JASPERFILE;</p>
<p>JRDataSource = JRDATA;</p>
<p>Parametermap = new hashmap ();</p>
<p>}</p>
<p>// set required parameters</p>
<p>Public void setParameters (Object Object, Object Object1) {</p>
<p>ParameterMap.Put (Object, Object1);</p>
<p>}</p>
<p>/ / Return the required file</p>
<p>Public file getjasperfile () {</p>
<p>Return jasperfile;</p>
<p>}</p>
<p>/ / Back to page of Parameter</p>
<p>Public map getParameters () {</p>
<p>Return ParameterMap;</p>
<p>}</p>
<p>/ / Return to the page of the page, if you are empty, return (New jremptyDataSource ()), otherwise return (New WebAppDataSource (DATA)) public jrdataser getDataSet () {</p>
<p>IF (JRDataSource == NULL) {</p>
<p>IF ((JRDATA == Null) || (JRDATA.GETRETCODE (). Equals ("NO_DATA"))) {</p>
<p>JRDataSource = New jremptyDataSource ();</p>
<p>} else {</p>
<p>JRDataSource = New WebAppdataSource (JRDATA);</p>
<p>}</p>
<p>}</p>
<p>Return JRDataSource;</p>
<p>}</p>
<p>}</p>
<p>3.Action</p>
<p>/ / Need to get an absolute path PATH</p>
<p>File ReportFile = New File (Path "Demo.jasper");</p>
<p>JreportParam JreportParam = New JreportParam (Reportfile, Dataset);</p>
<p>JreportParam.SetParameters ("ReportTitle", "My Demo");</p>
<p>HttpservletRequest.setttribute ("JreportParam", JreportParam);</p>
<p>ActionForward = ActionMapping.FindForward (ReportType);</p></div><div class="text-center mt-3 text-grey">
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var body = $('body');
body.on('submit', '#form', function() {
var jthis = $(this);
var jsubmit = jthis.find('#submit');
jthis.reset();
jsubmit.button('loading');
var postdata = jthis.serializeObject();
$.xpost(jthis.attr('action'), postdata, function(code, message) {
if(code == 0) {
location.reload();
} else {
$.alert(message);
jsubmit.button('reset');
}
});
return false;
});
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);
});
var jmessage = $('#message');
jmessage.on('focus', function() {if(jmessage.t) { clearTimeout(jmessage.t); jmessage.t = null; } jmessage.css('height', '6rem'); });
jmessage.on('blur', function() {jmessage.t = setTimeout(function() { jmessage.css('height', '2.5rem');}, 1000); });
$('#nav li[data-active="fid-1"]').addClass('active');
</script>
