java实现导出pdf

浅浅的花香味﹌ 2022-03-02 11:51 406阅读 0赞

### **1.添加Maven依赖** ###

<dependency>
              <groupId>org.xhtmlrenderer</groupId>
              <artifactId>flying-saucer-pdf</artifactId>
              <version>9.0.3</version>
          </dependency>
    
          <dependency>
              <groupId>com.itextpdf</groupId>
              <artifactId>itextpdf</artifactId>
              <version>5.5.10</version>
          </dependency>

### ** 2.工具类** ###

package com.dzqc.dz.common.util;
    
    
    import com.itextpdf.text.pdf.BaseFont;
    import org.xhtmlrenderer.pdf.ITextFontResolver;
    import org.xhtmlrenderer.pdf.ITextRenderer;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.OutputStream;
    
    
    public class PdfUtils {
    
        /**
         * 把URL转换为PDF
         * @return
         * @throws Exception
         */
        public static boolean htmlToPdf2(String outputFile, String url)
                throws Exception {
            File outFile = new File(outputFile);
            if (!outFile.exists()) {
                outFile.getParentFile().mkdirs();
            }
            OutputStream os = new FileOutputStream(outputFile);
            ITextRenderer renderer = new ITextRenderer();
            renderer.setDocument(url);
            String fontPath="/simsun.ttc";
            // 解决中文支持问题
            ITextFontResolver fontResolver = renderer.getFontResolver();
            fontResolver.addFont(fontPath, BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);
            renderer.layout();
            renderer.createPDF(os);
            os.flush();
            os.close();
            System.out.println("文件转换成功");
            return true;
        }
    
    
    
    
    
    }

### ** 3.Controller层** ###

/**
         * 批量导出座次表
         *
         * @param roomId
         * @return
         */
        @RequestMapping("/exportSeatNumPlanPDF")
        @ResponseBody
        public MyAjaxResult exportSeatNumPlanPDF(String roomId,String subjectId, HttpServletRequest request, HttpServletResponse response) {
            String path1 = System.getProperty("root") + File.separator + "resources" + File.separator + "PDF" + File.separator;
            File file = new File(path1);
    
            if (!file.exists() && !file.isDirectory()) {
                System.out.println("//不存在");
                file.mkdir();
            }
            if (subjectId==null||"".equals(subjectId)) {
            	return MyAjaxResult.fail_300("考试科目id不能为空");
            }
            BufferedOutputStream out = null;
            BufferedInputStream in = null;
            String[] split = null;
            if (null != roomId && !"".equals(roomId)) {
                split = roomId.split(",");
            }
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");//设置日期格式
            String format = df.format(new Date());
    
    
            String ip = SystemConstants.get("ip");
            SystemConstants.get("ip");
    
            String port = SystemConstants.get("port");
            try {
                System.out.println(roomId);
                boolean b = PdfUtils.htmlToPdf2(path1 + format+"-座次表.pdf", "http://"+ip+":" + port + request.getContextPath() + "/stuexamroom/selectRoomDoorPDF?path=zdbpzcb&roomId=" + roomId+"&subjectId="+subjectId);
                System.err.println(b);
                if (b) {
                    File f = new File(path1 + format+"-座次表.pdf");
                    out = new BufferedOutputStream(response.getOutputStream());
                    in = new BufferedInputStream(new FileInputStream(f));
                    response.setContentType(new MimetypesFileTypeMap().getContentType(f));// 设置response内容的类型
                    String filename = format+"-座次表";
                    if (isMSBrowsers.isMSBrowser(request)) {
                        filename = URLEncoder.encode(filename, "UTF-8");
                    } else {
                        filename = new String(filename.getBytes("utf-8"), "ISO8859-1");
                    }
                    response.setHeader("Content-disposition", "attachment;filename=" + filename + "." + "pdf");// 设置头部信息
                    byte[] buffer = new byte[1024];
                    int length = 0;
                    while ((length = in.read(buffer)) > 0) {
                        out.write(buffer, 0, length);
                    }
                    out.flush();
                }
    
            } catch (Exception e) {
                e.printStackTrace();
                return MyAjaxResult.fail_500("网络异常");
            } finally {
                try {
                    out.close();
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return MyAjaxResult.success("下载成功");
        }
    @RequestMapping("/selectRoomDoorPDF")
        public ModelAndView selectRoomDoorPDF(String path, String roomId,String subjectId) {
            String[] split = null;
            if (!"".equals(roomId)&& !"null".equals(roomId)) {
                split = roomId.split(",");
            }
            List<Examroom> stuExamRoom = null;
    		try {
    			stuExamRoom = stuExamRoomService.selectRoomDoorPDF(split,subjectId);
    			System.out.println(stuExamRoom);
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
            Map<String, Object> ma = new HashMap<>(16);
            ma.put("stuExamRooms", stuExamRoom);
            return new ModelAndView("pages/dzBackEnd/" + path, ma);
        }

### ** 4.页面** ###

<%@ page language="java" contentType="text/html; charset=UTF-8"
             pageEncoding="UTF-8" isELIgnored="false" %>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
    <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
    <html>
    <head>
        <meta charset="UTF-8"></meta>
        <meta name="viewport" content="width=device-width, initial-scale=1.0"></meta>
        <meta http-equiv="X-UA-Compatible" content="ie=edge"></meta>
        <title>座次表</title>
        <style>
            @page {
                size: A4;
                margin: 0;
            }
    
            html, body {
                margin: 0;
                padding: 0;
            }
    
            h2, h4 {
                text-align: center;
            }
    
            .wrap {
                width: 794px;
                /* height: 1123px; */
                height: auto;
                margin: 0 auto;
            }
    
            ul {
                width: 100%;
                margin: 0;
                padding: 0;
                overflow: hidden;
            }
    
            li {
                list-style: none;
                width: 20%;
                height: auto;
                float: left;
                margin-bottom: 3px;
                text-align: center;
            }
    
            li img {
                width: 120px;
            }
    
            li p {
                margin: 0;
                text-align: center;
            }
        </style>
    </head>
    <body bgcolor='white' style='font-family:SimSun; height:100%;' screen_capture_injected='true' ryt11773='1'>
    
    <c:set var="length" scope="session" value="${fn:length(stuExamRooms)}"/>
    <c:forEach items="${stuExamRooms}" var="room" varStatus="i">
        <c:set var="roompage" scope="session" value="${fn:length(room.stuSubjectRooms)}"/>
    
        <h4> 第${room.roomCode}考场 （个数:${roompage}）</h4>
        <div class="wrap">
            <ul>
                <c:forEach items="${room.stuSubjectRooms}" var="var" varStatus="q">
                    <li>
                        <img src="${path}/resources/photo/${var.ksh}.jpg"></img>
                        <p>${var.seatNum} ${var.name}</p>
                    </li>
    
                    <c:set var="count" scope="session" value="${q.count%35}"/>
    
                    <c:if test="${count==0}">
                        <p style="page-break-after:always;"></p>
                    </c:if>
                </c:forEach>
            </ul>
        </div>
    
    
        <c:if test="${length!=i.count}">
            <p style="page-break-after:always;"></p>
        </c:if>
    
    
    </c:forEach>
    
    
    <%--<h4> 第${rooCode}考场 （个数:${fn:length(list)}）</h4>
    <div class="wrap">
        <ul>
    
            <c:forEach items="${list}" var="var" varStatus="q">
                <li>
                    <img src="${path}/resource/img/dz/mg_photo.jpg"></img>
                    <p>${var.sear} ${var.name}</p>
                </li>
    
                <c:set var="count" scope="session" value="${q.count%35}"/>
                <c:if test="${count==0}">
                    <p style="page-break-after:always;"></p>
                </c:if>
    
    
            </c:forEach>
    
    
        </ul>
    </div>--%>
    </body>
    </html>

### ** 5.效果** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzQxNjYwMTgy_size_16_color_FFFFFF_t_70][]

###  **6.注意点** ###

**    1.div的文字换行**

在生成的pdf中，默认不会换行；实现换行在div的style中加入 word-wrap:break-word;

**   2.在转换pdf的时候对html文件的格式要求比较严格，标签必需有结束标签，否则将会报一系列错误**

**    ** 例如：换行只有一个<br>标签

则会报异常：

ERROR:  '元素类型 "br" 必须由匹配的结束标记 "</br>" 终止。'

如果是<br></br>则不会报异常。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzQxNjYwMTgy_size_16_color_FFFFFF_t_70]: /images/20220302/9a66294096bb4a8cb8e0e53ea39fc517.png