引入包
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-freemarker</artifactId> </dependency> <dependency><groupId>com.itextpdf</groupId><artifactId>html2pdf</artifactId><version>5.0.5</version> </dependency>
去windows目录下 获取字体 C:\Windows\Fonts simsunb.ttf、或者下载.ttc
@GetMapping("/download")@ApiOperation("下载")public void download(AlgorithmRouteDownloadDto downloadDto, HttpServletResponse response) {try (OutputStream os = response.getOutputStream()) {response.reset();response.setContentType("application/octet-stream");response.setHeader("Content-disposition", "attachment;filename=user_pdf_" + System.currentTimeMillis() + ".pdf");//获取指定的路由定义List<AlgorithmRouteDownloadVo> routeApis = this.algorithmRouteMapper.selectJoinList(AlgorithmRouteDownloadVo.class, queryWrapper);HashMap<String, Object> mapData = Maps.newHashMap();mapData.put("routeApis", routeApis);String templateContent = HtmlUtils.getTemplateContent("index.ftl", mapData);ByteArrayOutputStream byteArrayOutputStream = HtmlUtils.html2Pdf(templateContent);os.write(byteArrayOutputStream.toByteArray());} catch (Exception e) {log.error("error occurs when downloading file",e);}}
package com.ev.edge.utils;import cn.hutool.extra.spring.SpringUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.layout.font.FontProvider;
import freemarker.template.Configuration;
import freemarker.template.Template;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.*;
import java.util.stream.Collectors;@Slf4j
public class HtmlUtils {/*** @return* @throws Exception*/public static String getFileDirectory(String fileName) {ClassLoader classLoader = HtmlUtils.class.getClassLoader();URL resource = classLoader.getResource(fileName);try {return Objects.requireNonNull(resource).toURI().getPath();} catch (URISyntaxException e) {log.error("获取模板文件夹失败,{}", e);}return null;}/*** 获取模板内容** @param templateName 模板文件名* @param paramMap 模板参数* @return* @throws Exception*/public static String getTemplateContent(String templateName, Map<String, Object> paramMap) throws Exception {Configuration config = SpringUtil.getBean(FreeMarkerConfigurer.class).getConfiguration();config.setDefaultEncoding("UTF-8");config.setEncoding(Locale.CHINA, "UTF-8");Template template = config.getTemplate(templateName, "UTF-8");return FreeMarkerTemplateUtils.processTemplateIntoString(template, paramMap);}/*** HTML 转 PDF** @param content html内容* @param outPath 输出pdf路径* @return 是否创建成功*/public static boolean html2Pdf(String content, String outPath) {try {ConverterProperties converterProperties = new ConverterProperties();converterProperties.setCharset("UTF-8");FontProvider fontProvider = new FontProvider();fontProvider.addSystemFonts();converterProperties.setFontProvider(fontProvider);HtmlConverter.convertToPdf(content, new FileOutputStream(outPath), converterProperties);} catch (Exception e) {e.printStackTrace();log.error("生成模板内容失败,{}", e);return false;}return true;}/*** HTML 转 PDF** @param content html内容* @return PDF字节数组*/public static ByteArrayOutputStream html2Pdf(String content) {ByteArrayOutputStream outputStream = new ByteArrayOutputStream();try {ConverterProperties converterProperties = new ConverterProperties();converterProperties.setCharset("UTF-8");FontProvider fontProvider = new FontProvider();PdfFont fftFont = PdfFontFactory.createFont("fonts/simsunb.ttf", PdfEncodings.IDENTITY_H);PdfFont ttcFont = PdfFontFactory.createTtcFont("fonts/simsun.ttc", 1, PdfEncodings.IDENTITY_H, PdfFontFactory.EmbeddingStrategy.PREFER_EMBEDDED, true);boolean ttcFontResult = fontProvider.addFont(ttcFont.getFontProgram());boolean fftFontResult = fontProvider.addFont(fftFont.getFontProgram());log.info("html2Pdf add fount ttf:{} ttc:{}", fftFontResult, ttcFontResult);fontProvider.addSystemFonts();converterProperties.setFontProvider(fontProvider);HtmlConverter.convertToPdf(content, outputStream, converterProperties);} catch (Exception e) {e.printStackTrace();log.error("生成 PDF 失败,{}", e);}return outputStream;}public static List<Map<String, Object>> convertJsonToListMap(String json) {if (StringUtils.isBlank(json)) {return Collections.emptyList();}ObjectMapper objectMapper = new ObjectMapper();try {// 将 JSON 字符串转换为 List<Map<String, Object>> 类型List<Map<String, Object>> list = objectMapper.readValue(json, objectMapper.getTypeFactory().constructCollectionType(List.class, Map.class));// 将 List<Map<String, Object>> 转换为 List<Map<String, Object>>，并排除 'id' 和 'mapping' 字段return list.stream().map(map -> filterMap(map)).collect(Collectors.toList());} catch (IOException e) {throw new RuntimeException(e);}}private static Map<String, Object> filterMap(Map<String, Object> map) {return map.entrySet().stream().filter(entry -> !"id".equals(entry.getKey()) && !"mapping".equals(entry.getKey())).collect(Collectors.toMap(Map.Entry::getKey, // 保持 key 不变entry -> {if (entry.getValue() instanceof List) {// 处理 children 字段@SuppressWarnings("unchecked")List<Map<String, Object>> childrenList = (List<Map<String, Object>>) entry.getValue();return childrenList.stream().map(child -> filterMap(child)).collect(Collectors.toList());} else if (entry.getValue() instanceof Map) {// 递归处理嵌套的 Mapreturn filterMap((Map<String, Object>) entry.getValue());} else {// 其他 value 转为 Stringreturn entry.getValue().toString();}}));}
}
<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html;charset=utf-8" /><title></title><style>.main{width: 60%;margin: 0 auto;padding-bottom: 30px;}table {width: 100%;font-size: 14px;margin:10px auto;border-collapse: collapse;}th, td {border: 1px solid #000;padding: 2px 5px;text-align: center;}th {font-weight: bold;}.thFirst{width: 30%;}.sizeWeight{font-weight: bold;}</style></head><body><#list routeApis as routeApi><div class="main"><h3>${routeApi?index+1}. <#if routeApi.algoName??> ${routeApi.algoName} <#else> ${routeApi.remark!""} </#if></h3><p><span class="sizeWeight">路由地址：</span>${routeApi.routePath}</p><p><span class="sizeWeight">请求方式：</span>${routeApi.routeMethod}</p><p><span class="sizeWeight">描述：</span> <#if routeApi.algoName??> ${routeApi.algoName} <#else> ${routeApi.remark!""} </#if> </p><h4>请求参数：</h4><table><thead><tr><th class="thFirst">参数</th><th>说明</th> </tr></thead><tbody><#if routeApi.reqParamList??><#list routeApi.reqParamList as reqParam><#list reqParam?keys as key><#assign value = reqParam[key]><#if key != "children"><tr><td>${key}</td><td>${value!}</td></tr></#if><#if key == "children"><#if value??><#list value as childValue><#list childValue?keys as key1><#assign value1 = childValue[key1]><tr><td>-${key1}</td><td>${value1}</td></tr></#list></#list></#if></#if></#list></#list><#else><tr><td colspan="2">无请求参数</td></tr></#if></tbody></table><h4>返回参数：</h4><table><thead><tr><th class="thFirst">参数</th><th>说明</th> </tr></thead><tbody><#if routeApi.resParamList??><#list routeApi.resParamList as resParam><#list resParam?keys as key><#assign value = resParam[key]><#if key != "children"><tr><td>${key}</td><td>${value!}</td></tr></#if><#if key == "children"><#if value??><#list value as childValue><#list childValue?keys as key1><#assign value1 = childValue[key1]><tr><td>-${key1}</td><td>${value1}</td></tr></#list></#list></#if></#if></#list></#list><#else><tr><td colspan="2">无请求参数</td></tr></#if></tbody></table><h4>响应码：</h4><table><thead><tr><th class="thFirst">响应码</th><th>说明</th> </tr></thead><tbody><#if routeApi.resCodeList??><#list routeApi.resCodeList as resCode><#list resCode?keys as key><#assign value = resCode[key]><#if key != "children"><tr><td>${key}</td><td>${value!}</td></tr></#if><#if key == "children"><#if value??><#list value as childValue><#list childValue?keys as key1><#assign value1 = childValue[key1]><tr><td>-${key1}</td><td>${value1}</td></tr></#list></#list></#if></#if></#list></#list><#else><tr><td colspan="2">无响应码</td></tr></#if></tbody></table></div> </#list></body>
</html>