使用方法：

1.需要两个jar包：

iText-5.0.6.jar    //必须使用该版本，否则缺少相关的方法

TextAsian.jar

//是为了文档中正常显示中文所必须引用的包

TextAsian.jar使用时并不是单纯的引入就可以了，还需要进一步处理该jar包，否则无法显示

（无奈当时没有保存那个解决方法的链接，所以以后要用正确的包的话，就去毕设项目下找该包）

2以下是一个完整的例子。

一、要生成pdf的jsp页面

<%@ page language="java" import="java.util.*,utils.*,entity.*,dao.*" pageEncoding="utf-8"%>

<%@ include file="top.jsp" %>

<% /*------------------------------操作记录-----------------------------------*/

    DoOperation dp=new DoOperation();

    Operation op=new Operation();

    User user=(User) session.getAttribute("UserBean");

    String IP=(String) session.getAttribute("IP");

    op=dp.getOperation(IP, user.getId()+"", "舆情报告", "成功");

    OperationCl oc=new OperationCl();

    oc.addOperation(op);

%>

<!DOCTYPE html>

<html>

<head>

<meta http-equiv="X-UA-Compatible" content="IE=edge">

<meta http-equiv="X-UA-Compatible" content="chrome=1">

<meta charset="gbk">

<title>舆情报告</title>

<meta name="viewport"

    content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

<meta name="author" content="puyuetian qq632827168">

<meta name="renderer" content="webkit">

<meta http-equiv="Cache-Control" content="no-siteapp" />

<link rel="stylesheet" href="./css/invatation/upload.css" />

<link rel="stylesheet" href="./css/invatation/default.css" />

<script charset="utf-8" src="./js/invatation/kindeditor-min.js"></script>

<script charset="utf-8" src="./js/invatation/zh_CN.js"></script>

<script charset="utf-8" src="./js/invatation/puyuetian.js"></script>

<script language="javascript" type="text/javascript"

    src="./js/My97DatePicker/WdatePicker.js"></script>

<link rel="stylesheet" href="./css/invatation/amazeui.min.css">

<link rel="stylesheet" href="./css/invatation/app.css">

<!--[if (gte IE 9)|!(IE)]><!-->

<script src="./js/invatation/jquery.min.js"></script>

<!--<![endif]-->

<script src="./js/invatation/amazeui.min.js"></script>

</head>

<body>

    <style>

.hook-mail-forgotpassword-a {

    font-size: 12px;

    display: block;

    text-align: right;

}

</style>

<br>

    <div class="am-container">

        <div class="am-container">

            <div style="background-color: white;padding: 1.6rem;">

                <style>

.am-breadcrumb li {

    white-space: nowrap;

    overflow: hidden;

    text-overflow: ellipsis;

    max-width: 360px;

}

</style>

                <link rel="stylesheet" href="./css/invatation/edit.css">

                <script>

                    var editor;

                    KindEditor.ready(function(K) {

                        editor = K.create('textarea[name=content]', {

                            width : '100%',

                            height : '360px',

                            resizeType : 1,

                            allowPreviewEmoticons : false,

                            allowImageUpload : false,

                            items : [ 'source', '|', 'fontname', 'fontsize',

                                    '|', 'forecolor', 'hilitecolor', 'bold',

                                    'italic', 'underline', 'removeformat', '|',

                                    'justifyleft', 'justifycenter',

                                    'justifyright', 'insertorderedlist',

                                    'insertunorderedlist', '|', 'emoticons',

                                    'table', 'code', 'image', 'link',

                                    'quickformat' ]

                        });

                    });

                </script>

                <a name="post"></a>

                <div class="am-container" style="background:white">

                    <form name="form_post" class="am-form am-form-horizontal"

                         method="post" action="reportServlet">

                        <div class="text"  style=" text-align:center;font-size:26px;">舆情报告</div>

                        <br>

                        <div class="am-form-group ">

                            <input type="text" style="width:560px;" name="title"

                                placeholder="舆情事件" value="" onfocus="readsortdiv('visible')"

                                autocomplete="off">

                            <div id="readsortdiv" class="readsortdiv"></div>

                        </div>

                        <div class="am-form-group ">

                            <input name="time" class="Wdate" type="text" placeholder="发生时间"

                                onClick="WdatePicker()" style="width:220px;">

                        </div>

                        <div class="am-form-group">

                            <select name="area" style="margin: 10px 0px;width:360px;">

                                <option value="0">发生地区</option>

                                <option value='和平区'>和平区</option>

                                <option value='南开区'>南开区</option>

                                <option value='河东区'>河东区</option>

                                <option value='河西区'>河西区</option>

                                <option value='河北区'>河北区</option>

                                <option value='红桥区'>红桥区</option>

                                <option value='西青区'>西青区</option>

                                <option value='塘沽区'>塘沽区</option>

                                <option value='汉沽区'>汉沽区</option>

                                <option value='东丽区'>东丽区</option>

                                <option value='大港区'>大港区</option>

                                <option value='津南区'>津南区</option>

                                <option value='北辰区'>北辰区</option>

                                <option value='武清区'>武清区</option>

                                <option value='宝坻区'>宝坻区</option>

                                <option value='宁河县'>宁河县</option>

                                <option value='静海县'>静海县</option>

                                <option value='蓟县'>蓟县</option>

                            </select>

                        </div>

                        <div class="am-form-group">

                            <textarea name="summary" placeholder="舆情概述"></textarea>

                        </div>

                        <div class="am-form-group">

                            <textarea name="data" placeholder="相关数据"></textarea>

                        </div>

                        <div class="am-form-group">

                            <textarea name="result" placeholder="结论"></textarea>

                        </div>

                        <div class="am-form-group">

                            <textarea name="advise" placeholder="部门意见"></textarea>

                        </div>

                        <div class="am-form-group">

                            <input type="submit" class="am-btn am-btn-primary" value="生成PDF" />

                        </div>

                    </form>

                </div>

            </div>

        </div>

        <link rel="stylesheet" href="./css/invatation/hdrive.css">

        <script defer="defer">

            var $USER = Array();

            $USER['ID'] = "2";

            $USER['USERNAME'] = "游客";

            $USER['NICKNAME'] = "匿名游客";

            $USER['QUANXIAN'] = "bbcode,download,lookread,lookuser,reply,search";

            $USER['TIANDOU'] = "0";

            $USER['JIFEN'] = "0";

            $USER['QIANDAODAYS'] = "79";

            $USER['QIANDAOTIME'] = "1452392237";

            $USER['SEX'] = "机器人";

            $USER['BIRTHDAY'] = "0";

            $USER['MAIL'] = "632827168@qq.com";

            $USER['QQ'] = "632827168";

            $USER['PHONE'] = "保密";

            $USER['SIGN'] = "系统用户组 - 游客";

            $USER['FRIENDS'] = "_1_";

            $USER['READLEVEL'] = "0";

            var $GET = Array();

            $GET['C'] = "edit";

            $GET['TYPE'] = "read";

            $GET['SORTID'] = "0";

            var $SET = Array();

            $SET['QIANDAOJIFEN'] = "10";

            $SET['QIANDAOTIANDOU'] = "10";

            var $QIANDAOED = 'FALSE';

            function windowonscroll() { //页面滚动事件

                //navmove();

            }

            function loadinghere() { //页面加载至此事件

                $newmessagenum = '492';

                if ($newmessagenum != '') {

                    $newmessagenum = parseInt($newmessagenum);

                    $title = "您有新条新消息。";

                    document.getElementById("mf_m_new").style.visibility = 'visible';

                    document.getElementById("mf_m").title = $title;

                }

                if ($USER['ID'] != 2) {

                    showxunzhang();

                    showuserlevelprogressbar();

                }

                qiandao(0);

            }

            function loadcomplete() {

                //页面加载完成事件,异步数据驱动

                var s = document.createElement('script');

                s.src = 'http:\/\/tongji.hadsky.com\/tongji.php?domain='

                        + document.domain + '&allurl='

                        + encodeURIComponent(document.location);

                //alert(encodeURI(document.location));

                document.getElementsByTagName('head')[0].appendChild(s);

            }

            try {

                loadinghere();

            } catch (e) {

                //TODO handle the exception

            }

            window.onscroll = windowonscroll;

            //创建全局驱动框架

            var cifrm = document.createElement('iframe');

            cifrm.name = 'ifrm';

            cifrm.id = 'ifrm';

            cifrm.style.display = 'none';

            document.getElementsByTagName('body')[0].appendChild(cifrm);

            window.onload = loadcomplete;

        </script>

        <script src="./js/invatation/upload.js"></script>

        <link rel="stylesheet" href="./css/invatation/footer.css" />

        <div class="am-container">

            <div style="background-color: white;padding: 1.6rem;">

                <p class="am-text-center am-article-meta"

                    style="padding-top:4.8rem;padding-bottom:1.6rem;">

                    梦虽然遥不可及，但并不是不可能实现；只要坚持，就会离梦越来越近！</p>

            </div>

        </div>

</body>

</html>

二、处理请求的servlet

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import dao.OperationCl;

import dao.ReportCl;

import entity.Operation;

import entity.Report;

import entity.User;

import utils.DoOperation;

import utils.DoPDF;

import java.text.SimpleDateFormat;

import java.util.Date;

public class reportServlet 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 {

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        request.setCharacterEncoding("utf-8");

        /*------------------操作记录-------------------*/

        DoOperation dp=new DoOperation();

        Operation op=new Operation();

        HttpSession session = request.getSession();

        User user=(User) session.getAttribute("UserBean");

        String IP=(String) session.getAttribute("IP");

        op=dp.getOperation(IP, user.getId()+"", "舆情报告", "成功");

        OperationCl oc=new OperationCl();

        oc.addOperation(op);

        //前台接收数据

        String title=request.getParameter("title");

        String time=request.getParameter("time");

        String area=request.getParameter("area");

        String summary=request.getParameter("summary");

        String data=request.getParameter("data");

        String result=request.getParameter("result");

        String advise=request.getParameter("advise");

        //得到用户id

        int userID=user.getId();

        //文档路径和命名

        SimpleDateFormat df = new  SimpleDateFormat("yyyyMMddHHmmss");//设置日期格式

        String str=df.format(new Date());// new Date()为获取当前系统时间

        String filePath="F://MyEclipseWorkspace2014//MyData//WebRoot//WEB-INF//report//"+str+"report.pdf";

        String fileName=str+"report.pdf";//在文件名前加上时间，文件名不再重复

        //生成pdf文档

        DoPDF doPdf=new DoPDF();//生成pdf的类

        doPdf.getPDF(filePath, title, time, area, summary, data, result, advise);

    }

}

三、真正生成pdf文档的类DoPDF

package utils;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import com.itextpdf.text.BaseColor;

import com.itextpdf.text.Document;

import com.itextpdf.text.DocumentException;

import com.itextpdf.text.Element;

import com.itextpdf.text.Font;

import com.itextpdf.text.PageSize;

import com.itextpdf.text.Phrase;

import com.itextpdf.text.pdf.BaseFont;

import com.itextpdf.text.pdf.PdfPCell;

import com.itextpdf.text.pdf.PdfPTable;

import com.itextpdf.text.pdf.PdfWriter;

public class DoPDF {

public void getPDF(String filePath,String title,String time,String area,

        String summary,String data,String result,String advise) throws IOException{

    Document document = new Document(PageSize.A4);

    try {

        try {

            PdfWriter.getInstance(document,

                    new FileOutputStream(filePath));

        } catch (FileNotFoundException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        document.open();

        BaseFont bfCN;

        Font fontCN ;

            bfCN = BaseFont.createFont("STSongStd-Light","UniGB-UCS2-H", false);

            fontCN = new Font(bfCN, 12, Font.NORMAL, BaseColor.BLACK);

        PdfPTable table = new PdfPTable(4);

        table.setTotalWidth(new float[]{66,84,66,84});

        // 设置字体大小

        PdfPCell cell = new PdfPCell(new Phrase("舆情报告",fontCN));

        cell.setColspan(4);

        cell.setBorderWidth(0);//设置表格的边框宽度为0

        cell.setMinimumHeight(30);

        cell.setHorizontalAlignment(Element.ALIGN_CENTER);

        table.addCell(cell);

        PdfPCell cell1 = new PdfPCell(new Phrase("舆情事件",fontCN));

        cell1.setColspan(1);

        cell1.setBorderWidth(1);//设置表格的边框宽度为0

        cell1.setMinimumHeight(30);

        table.addCell(cell1);

        PdfPCell cell2 = new PdfPCell(new Phrase(title,fontCN));

        cell2.setColspan(3);

        cell2.setBorderWidth(1);//设置表格的边框宽度为0

        cell2.setMinimumHeight(30);

        table.addCell(cell2);

        PdfPCell cell3 = new PdfPCell(new Phrase("发生时间",fontCN));

        cell3.setColspan(1);

        cell3.setBorderWidth(1);//设置表格的边框宽度为0

        cell3.setMinimumHeight(30);

        table.addCell(cell3);

        PdfPCell cell4 = new PdfPCell(new Phrase(time,fontCN));

        cell4.setColspan(1);

        cell4.setBorderWidth(1);//设置表格的边框宽度为0

        cell4.setMinimumHeight(30);

        table.addCell(cell4);

        PdfPCell cell5 = new PdfPCell(new Phrase("发生地区",fontCN));

        cell5.setColspan(1);

        cell5.setBorderWidth(1);//设置表格的边框宽度为0

        cell5.setMinimumHeight(30);

        table.addCell(cell5);

        PdfPCell cell6 = new PdfPCell(new Phrase(area,fontCN));

        cell6.setColspan(1);

        cell6.setBorderWidth(1);//设置表格的边框宽度为0

        cell6.setMinimumHeight(30);

        table.addCell(cell6);

        PdfPCell cell7 = new PdfPCell(new Phrase("舆情概述",fontCN));

        cell7.setColspan(4);

        cell7.setBorderWidth(1);//设置表格的边框宽度为0

        cell7.setMinimumHeight(30);

        table.addCell(cell7);

        PdfPCell cell8 = new PdfPCell(new Phrase(summary,fontCN));

        cell8.setColspan(4);

        cell8.setBorderWidth(1);//设置表格的边框宽度为0

        cell8.setMinimumHeight(90);

        table.addCell(cell8);

        PdfPCell cell9 = new PdfPCell(new Phrase("相关数据",fontCN));

        cell9.setColspan(4);

        cell9.setBorderWidth(1);//设置表格的边框宽度为0

        cell9.setMinimumHeight(30);

        table.addCell(cell9);

        PdfPCell cell10 = new PdfPCell(new Phrase(data,fontCN));

        cell10.setColspan(4);

        cell10.setBorderWidth(1);//设置表格的边框宽度为0

        cell10.setMinimumHeight(90);

        table.addCell(cell10);

        PdfPCell cellA = new PdfPCell(new Phrase("结论",fontCN));

        cellA.setColspan(4);

        cellA.setBorderWidth(1);//设置表格的边框宽度为0

        cellA.setMinimumHeight(30);

        table.addCell(cellA);

        PdfPCell cellB = new PdfPCell(new Phrase("cell B",fontCN));

        cellB.setColspan(4);

        cellB.setBorderWidth(1);//设置表格的边框宽度为0

        cellB.setMinimumHeight(90);

        table.addCell(cellB);

        PdfPCell cellC = new PdfPCell(new Phrase(advise,fontCN));

        cellC.setColspan(4);

        cellC.setBorderWidth(1);//设置表格的边框宽度为0

        cellC.setMinimumHeight(30);

        table.addCell(cellC);

        PdfPCell cellD = new PdfPCell(new Phrase("cell D",fontCN));

        cellD.setColspan(4);

        cellD.setBorderWidth(1);//设置表格的边框宽度为0

        cellD.setMinimumHeight(90);

        table.addCell(cellD);

        PdfPCell cellE = new PdfPCell(new Phrase("领导意见",fontCN));

        cellE.setColspan(2);

        cellE.setBorderWidth(1);//设置表格的边框宽度为0

        cellE.setMinimumHeight(30);

        table.addCell(cellE);

        PdfPCell cellF = new PdfPCell(new Phrase("审批意见",fontCN));

        cellF.setColspan(2);

        cellF.setBorderWidth(1);//设置表格的边框宽度为0

        cellF.setMinimumHeight(30);

        table.addCell(cellF);

        PdfPCell cellM = new PdfPCell(new Phrase("",fontCN));

        cellM.setColspan(2);

        cellM.setBorderWidth(1);//设置表格的边框宽度为0

        cellM.setMinimumHeight(70);

        table.addCell(cellM);

        PdfPCell cellN = new PdfPCell(new Phrase("",fontCN));

        cellN.setColspan(2);

        cellN.setBorderWidth(1);//设置表格的边框宽度为0

        cellN.setMinimumHeight(70);

        table.addCell(cellN);

        document.add(table);

    }catch (DocumentException  e) {

        e.printStackTrace();

    } finally {

        document.close();

    }

}

}

四、文档下载的servlet

package servlet;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.URLEncoder;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class DownloadServlet 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 {

        response.setContentType("text/html");

        /*-----------------接收文件名和文件路径-----------------------------------*/

        String filename = request.getParameter("filename");

        String path = request.getParameter("filepath");

        //System.out.println(filename);

        response.setContentType(getServletContext().getMimeType(filename));

        response.setHeader("Content-Disposition","attachment;filename="+filename);

        //String fullFileName=getServletContext().getRealPath("/download/"+filename);

        InputStream in=new FileInputStream(path);

        OutputStream out = response.getOutputStream();

        //创建缓冲区

        byte buffer[] = new byte[1024];

        int len = 0;

        //循环将输入流中的内容读取到缓冲区当中

        while((len=in.read(buffer))>0){

            //输出缓冲区的内容到浏览器，实现文件下载

            out.write(buffer, 0, len);

        }

        //关闭文件输入流

        in.close();

        //关闭输出流

        out.close(); } 

}

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