JasperReport + Servlet Web应用之：HTML显示报表内容

构造我们的JavaBean：(get,set方法省略，属性名称要与报表的字段名)

public class Person {
	private String person_Id;

	private String person_name;

	private String person_age;

	private String person_address;
}

 构造我们的Service层：

public class PersonService {
	public List<Person> getAllPerson() {
		List<Person> perList = new ArrayList<Person>();
		perList.add(new Person("101", "小博", "22", "湖北"));
		perList.add(new Person("102", "张三", "21", "湖南"));
		perList.add(new Person("103", "李四", "23", "江苏"));
		perList.add(new Person("104", "王五", "22", "上海"));
		perList.add(new Person("101", "小博", "22", "湖北"));
		return perList;
	}
}

 构造我们的Servlet：

public class JRHTMLServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		ServletContext context = this.getServletConfig().getServletContext();
		File jasperFile = new File(context.getRealPath("/jasper/preson.jasper"));
		Map<String, String> parameters = new HashMap<String, String>();
		parameters.put("year", "2009");
		parameters.put("unit_mc", "武汉XX科技有限公司");
		JasperPrint jasperPrint = null;
		response.setCharacterEncoding("utf-8");
		try {
			JasperReport jasperReport = (JasperReport) JRLoader
					.loadObject(jasperFile);
			List<Person> personList = new PersonService().getAllPerson();
			jasperPrint = JasperFillManager.fillReport(jasperReport, parameters,
					new JRBeanCollectionDataSource(personList));
		} catch (JRException e) {
			e.printStackTrace();
		}
		if(null != jasperPrint){
			JRHtmlExporter exporter = new JRHtmlExporter();
			request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE,jasperPrint);
			exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
			exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, response.getWriter());
			exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,"image?image=");
			try {
				exporter.exportReport();
			} catch (JRException e) {
				e.printStackTrace();
			}
		}
	}
}

 web.xml配置：

<servlet>
		<servlet-name>JRHTMLServlet</servlet-name>
		<servlet-class>com.mengya.servlet.JRHTMLServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>JRHTMLServlet</servlet-name>
		<url-pattern>/JRHTMLServlet</url-pattern>
	</servlet-mapping>

 在web.xml还要配置JasperReport的自带的一个Serlvet，不然显示报表内空时样式不好看。

<!-- JasperReport包中自带的Servlet，用来做为HTML形式显示报表的时候报表的图片，要在这里配置上，图片在jasperReport包中 -->
	<servlet>
		<servlet-name>JasperReportImageServlet</servlet-name>
		<servlet-class>
			net.sf.jasperreports.j2ee.servlets.ImageServlet
		</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>JasperReportImageServlet</servlet-name>
		<url-pattern>/image</url-pattern>
	</servlet-mapping>

 这里的servlet路径要与上面我写的那个serlvet中的JRHtmlExporterParameter.IMAGES_URI值一样！

  页面调用：

<a href="JRHTMLServlet">Servlet中生成HTML</a>

 

不通过servlet直接通过jsp出生的方式如下：

<a href="jsp/viewer.jsp">JSP中生成报表显示</a>

 

viewer.jsp内空如下：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@ page import="com.mengya.JRDataSource.PersonDataSource " %>
<%@ page import="net.sf.jasperreports.engine.*" %>
<%@ page import="net.sf.jasperreports.engine.util.*" %>
<%@ page import="net.sf.jasperreports.engine.export.*" %>
<%@ page import="net.sf.jasperreports.j2ee.servlets.*" %>
<%@ page import="java.io.*" %>
<%@ page import="com.mengya.bean.Person" %>
<%@ page import="com.mengya.service.PersonService" %>
<%@ page import="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource" %>
<%
	JasperPrint jasperPrint = (JasperPrint)session.getAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE);
	if (request.getParameter("reload") != null || jasperPrint == null)
	{
		File reportFile = new File(application.getRealPath("/jasper/preson.jasper"));
		if (!reportFile.exists())
			throw new JRRuntimeException("File preson.jasper not found. The report design must be compiled first.");
		JasperReport jasperReport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
		Map parameters = new HashMap();
		parameters.put("year", "2009");
		parameters.put("unit_mc", "武汉XX科技有限公司");
		List<Person> personList = new PersonService().getAllPerson();			
		jasperPrint = 
			JasperFillManager.fillReport(
				jasperReport, 
				parameters, 
				new JRBeanCollectionDataSource(personList)
				);
		session.setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);
	}
	JRHtmlExporter exporter = new JRHtmlExporter();
	int pageIndex = 0;
	int lastPageIndex = 0;
	if (jasperPrint.getPages() != null)
	{
		lastPageIndex = jasperPrint.getPages().size() - 1;
	}
	String pageStr = request.getParameter("page");
	try
	{
		pageIndex = Integer.parseInt(pageStr);
	}
	catch(Exception e)
	{
	}
	if (pageIndex < 0)
	{
		pageIndex = 0;
	}
	if (pageIndex > lastPageIndex)
	{
		pageIndex = lastPageIndex;
	}
	StringBuffer sbuffer = new StringBuffer();
	exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
	exporter.setParameter(JRExporterParameter.OUTPUT_STRING_BUFFER, sbuffer);
	exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "../image?image=");
	exporter.setParameter(JRExporterParameter.PAGE_INDEX, new Integer(pageIndex));
	exporter.setParameter(JRHtmlExporterParameter.HTML_HEADER, "");
	exporter.setParameter(JRHtmlExporterParameter.BETWEEN_PAGES_HTML, "");
	exporter.setParameter(JRHtmlExporterParameter.HTML_FOOTER, "");
	exporter.exportReport();
%>


<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<head>
  <style type="text/css">
    a {text-decoration: none}
  </style>
</head>
<body text="#000000" link="#000000" alink="#000000" vlink="#000000">
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
  <td width="50%">&nbsp;</td>
  <td align="left">
    <hr size="1" color="#000000">
    <table width="100%" cellpadding="0" cellspacing="0" border="0">
      <tr>
        <td><a href="viewer.jsp?reload=true"><img src="../images/reload.GIF" border="0"></a></td>
        <td>&nbsp;&nbsp;&nbsp;</td>
		<%
			if (pageIndex > 0)
			{
		%>
        <td><a href="viewer.jsp?page=0"><img src="../images/first.GIF" border="0"></a></td>
        <td><a href="viewer.jsp?page=<%=pageIndex - 1%>"><img src="../images/previous.GIF" border="0"></a></td>
		<%
			}
			else
			{
		%>
        <td><img src="../images/first_grey.GIF" border="0"></td>
        <td><img src="../images/previous_grey.GIF" border="0"></td>
		<%
			}
			if (pageIndex < lastPageIndex)
			{
		%>
		        <td><a href="viewer.jsp?page=<%=pageIndex + 1%>"><img src="../images/next.GIF" border="0"></a></td>
		        <td><a href="viewer.jsp?page=<%=lastPageIndex%>"><img src="../images/last.GIF" border="0"></a></td>
		<%
			}
			else
			{
		%>
        <td><img src="../images/next_grey.GIF" border="0"></td>
        <td><img src="../images/last_grey.GIF" border="0"></td>
		<%
			}
		%>
        <td width="100%">&nbsp;</td>
      </tr>
    </table>
    <hr size="1" color="#000000">
  </td>
  <td width="50%">&nbsp;</td>
</tr>
<tr>
  <td width="50%">&nbsp;</td>
  <td align="center">
	<%=sbuffer.toString()%>
  </td>
  <td width="50%">&nbsp;</td>
</tr>
</table>
</body>
</html>