springboot pdf浏览与下载

maven配置## 标题

  <!--         https://mvnrepository.com/artifact/com.itextpdf/itextpdf --><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13</version></dependency><!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian --><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency><dependency><groupId>org.xhtmlrenderer</groupId><artifactId>flying-saucer-pdf</artifactId><version>9.1.12</version></dependency>

pdf工具类## 标题

package cn.prop.fm.pdf;import com.itextpdf.text.pdf.BaseFont;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
import org.w3c.dom.Document;
import org.xhtmlrenderer.pdf.ITextFontResolver;
import org.xhtmlrenderer.pdf.ITextRenderer;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.*;
import java.util.List;
import java.util.Map;/*** 功能：pdf处理工具类** @author qust* @version 1.0 2018/2/23 17:21*/
public class PdfUtils {private PdfUtils() {}private static final Logger LOGGER = LoggerFactory.getLogger(PdfUtils.class);/*** 按模板和参数生成html字符串,再转换为flying-saucer识别的Document** @param templateName freemarker模板名称* @param variables    freemarker模板参数* @return Document*/private static Document generateDoc(FreeMarkerConfigurer configurer, String templateName, Map<String, Object> variables) {Template tp;try {tp = configurer.getConfiguration().getTemplate(templateName);} catch (IOException e) {LOGGER.error(e.getMessage(), e);return null;}StringWriter stringWriter = new StringWriter();try (BufferedWriter writer = new BufferedWriter(stringWriter)) {try {tp.process(variables, writer);writer.flush();} catch (TemplateException e) {LOGGER.error("模板不存在或者路径错误", e);} catch (IOException e) {LOGGER.error("IO异常", e);}DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();return builder.parse(new ByteArrayInputStream(stringWriter.toString().getBytes()));} catch (Exception e) {LOGGER.error(e.getMessage(), e);return null;}}/*** 核心: 根据freemarker模板生成pdf文档** @param configurer   freemarker配置* @param templateName freemarker模板名称* @param out          输出流* @param listVars     freemarker模板参数* @throws Exception 模板无法找到、模板语法错误、IO异常*/private static void generateAll(FreeMarkerConfigurer configurer, String templateName, OutputStream out, List<Map<String, Object>> listVars) throws Exception {if (CollectionUtils.isEmpty(listVars)) {LOGGER.warn("警告:freemarker模板参数为空!");return;}ITextRenderer renderer = new ITextRenderer();Document doc = generateDoc(configurer, templateName, listVars.get(0));renderer.setDocument(doc, null);//设置字符集(宋体),此处必须与模板中的<bodystyle="font-family: SimSun">一致,区分大小写,不能写成汉字"宋体"//设置字符集(宋体),此处必须与模板中的<bodystyle="font-family: SimSun">一致,区分大小写,不能写成汉字"宋体"ITextFontResolver fontResolver = renderer.getFontResolver();fontResolver.addFont("simsun.ttc", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);//展现和输出pdfrenderer.layout();renderer.createPDF(out, false);//根据参数集个数循环调用模板,追加到同一个pdf文档中//(注意:此处从1开始,因为第0是创建pdf,从1往后则向pdf中追加内容)for (int i = 1; i < listVars.size(); i++) {Document docAppend = generateDoc(configurer, templateName, listVars.get(i));renderer.setDocument(docAppend, null);renderer.layout();renderer.writeNextDocument(); //写下一个pdf页面}renderer.finishPDF(); //完成pdf写入}/*** pdf下载** @param configurer   freemarker配置* @param templateName freemarker模板名称(带后缀.ftl)* @param listVars     模板参数集* @param response     HttpServletResponse* @param fileName     下载文件名称(带文件扩展名后缀)*/public static void download(FreeMarkerConfigurer configurer, String templateName, List<Map<String, Object>> listVars, HttpServletResponse response, String fileName) {// 设置编码、文件ContentType类型、文件头、下载文件名response.setCharacterEncoding("utf-8");response.setContentType("application/force-download");try {response.setHeader("Content-Disposition", "attachment;fileName=" +new String(fileName.getBytes("gb2312"), "ISO8859-1"));} catch (UnsupportedEncodingException e) {LOGGER.error(e.getMessage(), e);}try (ServletOutputStream out = response.getOutputStream()) {generateAll(configurer, templateName, out, listVars);} catch (Exception e) {LOGGER.error(e.getMessage(), e);}}/*** pdf预览** @param configurer   freemarker配置* @param templateName freemarker模板名称(带后缀.ftl)* @param listVars     模板参数集* @param response     HttpServletResponse*/public static void preview(FreeMarkerConfigurer configurer, String templateName, List<Map<String, Object>> listVars, HttpServletResponse response) {try (ServletOutputStream out = response.getOutputStream()) {generateAll(configurer, templateName, out, listVars);out.flush();} catch (Exception e) {LOGGER.error(e.getMessage(), e);}}
}

controller层## 标题

package cn.prop.fm.pdf;import cn.prop.fm.vo.MerVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;/*** 功能：pdf预览、下载**/
@Controller
@RequestMapping(value = "/pdf")
public class PdfController {@Autowiredprivate FreeMarkerConfigurer configurer;/*** pdf预览** @param request  HttpServletRequest* @param response HttpServletResponse*/@RequestMapping(value = "/preview", method = RequestMethod.GET)public void preview(HttpServletRequest request, HttpServletResponse response) {// 构造freemarker模板引擎参数,listVars.size()个数对应pdf页数List<Map<String, Object>> listVars = new ArrayList<>();List<MerVO> a = new LinkedList<>();MerVO s = new MerVO();s.setMerId("1");s.setMerName("1wewe");MerVO b = new MerVO();b.setMerId("1");b.setMerName("1wewe");a.add(s);a.add(b);Map<String, Object> variables = new HashMap<>();variables.put("title", "测试预览ASGX!");variables.put("list", a);listVars.add(variables);PdfUtils.preview(configurer, "pdfPage.ftl", listVars, response);}/*** pdf下载** @param request  HttpServletRequest* @param response HttpServletResponse*/@RequestMapping(value = "/download", method = RequestMethod.GET)public void download(HttpServletRequest request, HttpServletResponse response) {List<Map<String, Object>> listVars = new ArrayList<>();Map<String, Object> variables = new HashMap<>();variables.put("title", "测试下载ASGX!");listVars.add(variables);PdfUtils.download(configurer, "pdfPage.ftl", listVars, response, "测试中文.pdf");}
}

ftl模板## 标题

提示:样式需要更加实际情况调整，与html的页面布局有差异

<!DOCTYPE html>
<html>
<head lang="en"><title>Spring Boot Demo - PDF</title><style>margin:0,0;body{ text-align:center}#divcss{margin:0 auto;width:100%;height:50%;}table {border-collapse: collapse;text-align:center;}table, td, th {border: 1px solid black;}</style>
</head>
<bodystyle="font-family: 'SimSun'">
<div id="divcss"><divstyle="text-align:center"><h2>物业名</h2><h3>202006账单结算通知单</h3></div><divstyle=""><divstyle="width:50%;height: 100%;float:left;"><span>楼号/房号:1栋-2楼-201</span><br></br><span>租户名:孙悟空</span></div><divstyle="height: 100%;float:right"><p>账单周期:2020-06-01至2020-06-261</p></div></div><divstyle="clear: both"><table border="1"style="width: 100%"><tr><th>抄表费用</th><th>表计表号</th><th>上期读数</th><th>本期读数</th><th>总用电量</th><th>费用金额</th></tr><tr><td>电费</td><td>000000001221</td><td>2020-03-31</td><td>2020-03-31</td><td>50.84</td><td>50.84</td></tr><tr><td colspan="6">其它费用项</td></tr><tr><td colspan="6">测试固定收费:￥100  </td></tr></table></div><divstyle="border-bottom: 1px solid;border-left: 1px solid;border-right: 1px solid;height: 140px;text-align: center;margin-top: -18px;"><h3>此处为支付方式区域</h3><spanstyle="
position: relative;
top: 30px;">温馨提示:请贵公司及时缴清费用，以免逾期后自动断电影响正常用电，入有疑问，请致电服务热线。</span></div><div><spanstyle="margin-right: 8%;">制表人：车小明是的</span><span >   打印日期:2020-08-23 09:23</span></div>
</div>
</body>
</html>

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