HtmlExampleServlet演示如何通过HTML表格在Web环境下展示JFreeReport定义的表格
简单报表的HTML展示
JFreeReport提供HtmlProcessor类来将输入的JFreeReport报表变成HTML表格形式，最后通过Servlet的输出通道展示给用户，具体的用法如下例：
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.report.JFreeReport;
import org.jfree.report.modules.output.table.base.TableProcessor;
import org.jfree.report.modules.output.table.html.HtmlProcessor;
import org.jfree.report.modules.output.table.html.StreamHtmlFilesystem;
import org.jfree.report.util.Log;
/**
*
* <p>HtmlExampleServlet演示如何通过HTML表格在Web环境下展示JFreeReport定义的表格
* 简单报表的HTML展示
JFreeReport提供HtmlProcessor类来将输入的JFreeReport报表变成HTML表格形式，最后通过Servlet的输出通道展示给用户，具体的用法如下例：
*
* <p>
*
* 创建日期 2013-5-13<br>
* @author longgangbai<br>
* @version $Revision$ 2013-5-13
* @since 3.0.0
*/
public class JFreeReportHtmlServlet extends HttpServlet {
//
private static final long serialVersionUID = 1L;
public void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException,
IOException {
doPost(request, response);
}
public void doPost(final HttpServletRequest request, final HttpServletResponse response) throws ServletException,
IOException {
TableProcessor worker;
// 设置输出页面的Meta信息
response.setHeader("Content-Disposition", "inline; filename=\"" + "unknown.html" + "\"");
// 设置页面的输出格式
response.setHeader("Content-Type", "text/html");
try {
// 获取Servlet的输出流
OutputStream out = response.getOutputStream();
// 获取HelloWorld中定义的报表
JFreeReportView jfreeReport =new JFreeReportView();
JFreeReport report=jfreeReport.getJFreeReport();
// 将报表和Servlet的输出流作为参数传递给TableProcessor的实例
final HtmlProcessor processor = new HtmlProcessor(report);
processor.setFilesystem(new StreamHtmlFilesystem(out));
worker = processor;
} catch (Exception e) {
Log.debug("无法解析报表定义", e);
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
try {
// 输出结果
worker.processReport();
} catch (Exception e) {
Log.debug("输出结果产生错误", e);
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
}
}
动态的JFreeReport报表实现：
import java.awt.Color;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Point2D;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import org.jfree.report.ElementAlignment;
import org.jfree.report.JFreeReport;
import org.jfree.report.ReportProcessingException;
import org.jfree.report.elementfactory.TextFieldElementFactory;
import org.jfree.report.modules.gui.base.PreviewDialog;
import org.jfree.ui.FloatDimension;
/**
* 使用JFreeReport生成报表的简单例子，用于演示使用JFreeReport生成报表的一些基本步骤
*
* 本例子中，为了简化操作，报表定义是使用java直接编码
*
* @ 作者 ： bookman
*/
public class JFreeReportView {
/**
* 处理窗口关闭事件
*/
protected static class CloseHandler extends WindowAdapter {
public void windowClosing(final WindowEvent event) {
System.exit(0);
}
}
/**
* 创建和显示简单的报表
*/
public JFreeReportView() {
}
public JFreeReport getJFreeReport() {
// 获得创建报表需要用到的数据
final TableModel data = createData();
// 获得报表要用到的报表定义内容
final JFreeReport report = createReportDefinition();
// 将报表定义和数据结合
report.setData(data);
return report;
}
public void viewJFreeReport() {
try {
JFreeReport report =getJFreeReport();
// 将生成的报表放到预览窗口中
final PreviewDialog preview = new PreviewDialog(report);
preview.addWindowListener(new CloseHandler());
preview.pack();
// 显示报表预览窗口
preview.setVisible(true);
} catch (ReportProcessingException e) {
System.out.println(e);
}
}
/**
* 创建生成报表需要用到的数据
*
* @返回一个TableModel实例
*/
private TableModel createData() {
final Object[] columnNames = new String[] {"Column1", "Column2" };
final DefaultTableModel result = new DefaultTableModel(columnNames, 100);
int rownum = 0;
for (; rownum < 100; rownum++) {
result.setValueAt("say Hello " + rownum + "次", rownum, 0);
result.setValueAt("say World " + rownum + "次", rownum, 1);
}
return result;
}
/**
* 创建一个报表定义
*
* @返回一个报表定义实例
*/
private JFreeReport createReportDefinition() {
final JFreeReport report = new JFreeReport();
report.setName("A Very Simple Report");
/**
* 定义要显示报表第一列的样式
*/
TextFieldElementFactory factory = new TextFieldElementFactory();
factory.setName("T1");
factory.setAbsolutePosition(new Point2D.Float(0, 0));
factory.setMinimumSize(new FloatDimension(150, 20));
factory.setColor(Color.black);
factory.setHorizontalAlignment(ElementAlignment.LEFT);
factory.setVerticalAlignment(ElementAlignment.MIDDLE);
factory.setNullString("-");
factory.setFieldname("Column1");
report.getItemBand().addElement(factory.createElement());
/**
* 定义要显示报表第二列的样式
*/
factory = new TextFieldElementFactory();
factory.setName("T2");
factory.setAbsolutePosition(new Point2D.Float(200, 0));
factory.setMinimumSize(new FloatDimension(150, 20));
factory.setColor(Color.black);
factory.setHorizontalAlignment(ElementAlignment.LEFT);
factory.setVerticalAlignment(ElementAlignment.MIDDLE);
factory.setNullString("-");
factory.setFieldname("Column2");
report.getItemBand().addElement(factory.createElement());
/**
* 返回一个报表定义的实例
*/
return report;
}
}