SpringBoot + JasperReport6.x 集成报表控件，导出PDF汉字无法显示，控制台提示如下错误信息：
2020-07-30 09:27:17.539 [http-nio-9092-exec-1] WARN net.sf.jasperreports.engine.query.JRJdbcQueryExecuter - The supplied java.sql.Connection object is null.
SpringBoot 集成JasperReport6.x 之相关依赖：
<dependencies><!--springboot web 基础模块 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- springboot 集成jasperreport --><dependency><groupId>net.sf.jasperreports</groupId><artifactId>jasperreports</artifactId><version>6.10.0</version></dependency><dependency><groupId>com.lowagie</groupId><artifactId>itext</artifactId><version>2.1.7.js4</version></dependency><dependency><groupId>org.codehaus.groovy</groupId><artifactId>groovy-all</artifactId></dependency><dependency><groupId>org.mozilla</groupId><artifactId>javascript</artifactId><version>1.7.2</version></dependency><!-- spring 框架依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId></dependency><!-- lombok 框架依赖 --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies>
指定JasperReport6.x 报表字体：
项目结构：
jasperreports_extension.properties文件内容如下：
net.sf.jasperreports.extension.registry.factory.simple.font.families=net.sf.jasperreports.engine.fonts.SimpleFontExtensionsRegistryFactory
net.sf.jasperreports.extension.simple.font.families.lobstertwo=fonts/fonts.xml
fonts.xml配置内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<fontFamilies><fontFamily name="STS"><normal>fonts/STSONG.TTF</normal><bold>fonts/STSONG.TTF</bold><italic>fonts/STSONG.TTF</italic><boldItalic>fonts/STSONG.TTF</boldItalic><pdfEncoding>Identity-H</pdfEncoding><pdfEmbedded>true</pdfEmbedded><exportFonts><export key="net.sf.jasperreports.html">STS, Arial, Helvetica, sans-serif</export><export key="net.sf.jasperreports.xhtml">STS, Arial, Helvetica, sans-serif</export></exportFonts></fontFamily>
</fontFamilies>
针对控制台提示信息,需要修改的代码片段：
jasperreport6.x 输出pdf 文件核心代码：
@RequestMapping("/one")public void getReportByParam(HttpServletResponse response) {ServletOutputStream sosRef = null;// bean 连接获取try {Map<String, Object> map = new HashMap<String, Object>(); map.put("quarter", "第一季度");map.put("personUseCount", "111");map.put("archCount", "99");map.put("personCount", "74");map.put("textNumbs", "59/38");map.put("copyDrawingCount", "99");// 获取文件流ClassPathResource resource = new ClassPathResource("jasper" + File.separator + "Blank_A4_1.jasper");InputStream jasperStream = resource.getInputStream();sosRef = response.getOutputStream();// 重点代码JasperRunManager.runReportToPdfStream(jasperStream, sosRef, map, new JREmptyDataSource());response.setContentType("application/pdf");} catch (Exception e) {e.printStackTrace();} finally {try {sosRef.flush();sosRef.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
在标记为重点代码片段，我之前写了一种错误写法导致，控制台输出相关错误信息：
WARN net.sf.jasperreports.engine.query.JRJdbcQueryExecuter - The supplied java.sql.Connection object is null.
错误代码：
JasperRunManager.runReportToPdfStream(jasperStream, sosRef, map);
正确代码：
JasperRunManager.runReportToPdfStream(jasperStream, sosRef, map, new JREmptyDataSource());
报表显示效果:
