Tomcat 下使用itext生成报表.

1.Tomcat的安装不描述.现在假如Tomcat 安装目录为C:Tomcat 5.0,新建C: /Tomcat 5.0  /webapps   /pdfservlet目录.

    安装JDK    安装目录C:j2sdk1.4.2_09    去http://www.lowagie.com/iText/download.html下载itext1.3.0.jar,后解压  缩,将itext-1.3.0.jar 放到C: Tomcat 5.0  webapps   myServlets  WEB-INF   lib下(当然还有一些必须的包如servlet.jar) 和 C:  j2sdk1.4.2_09   lib下.并将C:/j2sdk1.4.2_09/   lib/   itext-1.3.0.jar加到CLASSPATH中.确保能正确编译.(我也是一名JAVA初学者,我想起码的JAVA环境配置要会)

2.下面就是itext 的例子,我在网上查过关于ITEXT的贴子,大部份都是转贴,一个贴子被一帮所谓的JAVA爱好者转了又转,难得出一份原创贴,可能那些JAVA高手有点低估我们初学者的水平,来个Helloworld字符串加到PDF中就算过了,TMD那个在实际中顶个叉用.我说这些话也只是希望那些精通JAVA的人能对我们这些初学负一点责任,写一点好贴,给我们参考一下.废话不多讲,下面是代码.:

import java.io.IOException;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Paragraph;
import com.lowagie.text.html.HtmlWriter;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.rtf.RtfWriter;
import com.lowagie.text.Element;
import com.lowagie.text.PageSize;
import com.lowagie.text.pdf.PdfPTable;

/**
 * Hello World example as a Servlet.
 *
 * @author blowagie
 */
public class HelloWorldServlet extends HttpServlet {  
    /**
     * Returns a PDF, RTF or HTML document.
     *
     * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public void doGet (HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException {
          System.out.println("document.add(BigTable)");
  // step1
  Document document = new Document(PageSize.A4.rotate(), 10, 10, 10, 10);  //定义纸张类型及方向,页边距
       
        // step 1
       
        try {
            // step 2: we set the ContentType and create an instance of the corresponding Writer
                response.setContentType("application/pdf");
                PdfWriter.getInstance(document, response.getOutputStream());
   // step3
   document.open();
   // step4 定义表格填充内容
   String[] bogusData = { "M0065920", "SL", "FR86000P", "PCGOLD",
     "119000", "96 06", "2001-08-13", "4350", "6011648299",
     "FLFLMTGP", "153", "119000.00" };
   int NumColumns = 12; //定义表格列数

   PdfPTable datatable = new PdfPTable(NumColumns); //创建新表.
   int headerwidths[] = { 9, 4, 8, 10, 8, 11, 9, 7, 9, 10, 4, 10 }; // percentage 定义表格头宽度
   datatable.setWidths(headerwidths);
   datatable.setWidthPercentage(100); // percentage
   datatable.getDefaultCell().setPadding(3);
   datatable.getDefaultCell().setBorderWidth(2);
   datatable.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
   //以下是填充表头
   datatable.addCell("Clock #");
   datatable.addCell("Trans Type");
   datatable.addCell("Cusip");
   datatable.addCell("Long Name");
   datatable.addCell("Quantity");
   datatable.addCell("Fraction Price");
   datatable.addCell("Settle Date");
   datatable.addCell("Portfolio");
   datatable.addCell("ADP Number");
   datatable.addCell("Account ID");
   datatable.addCell("Reg Rep ID");
   datatable.addCell("Amt To Go ");

   datatable.setHeaderRows(1); // this is the end of the table header

   datatable.getDefaultCell().setBorderWidth(1);
   for (int i = 1; i < 750; i++) {
    if (i % 2 == 1) {
     datatable.getDefaultCell().setGrayFill(0.9f);
    }
    for (int x = 0; x < NumColumns; x++) {
     datatable.addCell(bogusData[x]);
    }
    if (i % 2 == 1) {
     datatable.getDefaultCell().setGrayFill(0.0f);
    }
   }
   document.add(datatable);  //加载新表
        }
        catch(DocumentException de) {
            de.printStackTrace();
            System.err.println("document: " + de.getMessage());
        }
       
        // step 5: we close the document (the outputstream is also closed internally)
        document.close();
    }
}

正确编译它,我试过了没问题,我itext   REV.为1.3.0 放到C:   Tomcat 5.0    webapps    pdfservlet    WEB-INF    classes

2.由于是Servlet 我们创建一个WEB.XML 放到C:  Tomcat 5.0  webapps   pdfservlet   WEB-INF下

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">
<web-app>
<servlet>
<servlet-name>
HelloWorldServlet
</servlet-name>
<servlet-class>
HelloWorldServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/HelloWorldServlet</url-pattern>
</servlet-mapping>
</web-app>

3.重新启动TOMCAT

   http://IP地址:8080/pdfservlet/HelloWorldServlet

如果顺利的话你可以看到很漂亮的PDF报表