最近，项目上要做个打印的东西，还要预览。我想就直接生成pdf预览，然后用户选择打印
于是，昨天找了找资料。一般用itext 进行转pdf。于是我就用springboot试了试，代码比较简单，现在只是简单的一个实现。
整体流程如下
1.获取数据（比如从数据库获取数据）
2.通过freemarker 渲染页面
3.将渲染的页面进行转换为pdf，放在本地
4.读取pdf，实现预览
主要代码
pom文件
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <version>RELEASE</version> <scope>compile</scope> </dependency> <!-- 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.tool/xmlworker --> <dependency> <groupId>com.itextpdf.tool</groupId> <artifactId>xmlworker</artifactId> <version>5.5.13</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency> </dependencies>
PdfController代码
package com.kevin.pdf_demo.controller;import com.itextpdf.text.Document;import com.itextpdf.text.DocumentException;import com.itextpdf.text.pdf.PdfWriter;import com.itextpdf.tool.xml.XMLWorkerFontProvider;import com.itextpdf.tool.xml.XMLWorkerHelper;import freemarker.template.Configuration;import freemarker.template.Template;import org.apache.commons.io.IOUtils;import org.springframework.beans.factory.annotation.Value;import org.springframework.core.io.ClassPathResource;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletResponse;import java.io.*;import java.nio.charset.Charset;import java.util.HashMap;import java.util.Map;/**
* @author: kevin
* @Date: 2018/11/16
*/@RestControllerpublic class PdfController { @Value("${DEST}")
private String dest; @Value("${HTML}")
private String html; @Value("${FONT}")
private String font;
private static Configuration freemarkerCfg = null; @RequestMapping(value = "helloPdf")
public void showPdf(HttpServletResponse response) throws IOException, DocumentException { //需要填充的数据
Map<String, Object> data = new HashMap<>(16);
data.put("name", "kevin"); String content = freeMarkerRender(data,html); //创建pdf
createPdf(content, dest); // 读取pdf并预览
readPdf(response);
}
public void createPdf(String content,String dest) throws IOException, DocumentException { // step 1
Document document = new Document(); // step 2
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest)); // step 3
document.open(); // step 4
XMLWorkerFontProvider fontImp = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS);
fontImp.register(font);
XMLWorkerHelper.getInstance().parseXHtml(writer, document, new ByteArrayInputStream(content.getBytes("UTF-8")), null, Charset.forName("UTF-8"), fontImp); // step 5
document.close();
} /** * freemarker渲染html */
public String freeMarkerRender(Map<String, Object> data, String htmlTmp) {
Writer out = new StringWriter(); try { // 获取模板,并设置编码方式
setFreemarkerCfg();
Template template = freemarkerCfg.getTemplate(htmlTmp);
template.setEncoding("UTF-8"); //将合并后的数据和模板写入到流中，这里使用的字符流
template.process(data, out);
out.flush(); return out.toString();
} catch (Exception e) {
e.printStackTrace();
} finally { try {
out.close();
} catch (IOException ex) {
ex.printStackTrace();
}
} return null;
} /** * 设置freemarkerCfg */
private void setFreemarkerCfg() {
freemarkerCfg = new Configuration(); //freemarker的模板目录
try {
freemarkerCfg.setDirectoryForTemplateLoading(new ClassPathResource("template").getFile());
} catch (IOException e) {
e.printStackTrace();
}
} /** * 读取本地pdf,这里设置的是预览 */
private void readPdf(HttpServletResponse response) {
response.reset();
response.setContentType("application/pdf"); try {
File file = new File(dest);
FileInputStream fileInputStream = new FileInputStream(file);
OutputStream outputStream = response.getOutputStream();
IOUtils.write(IOUtils.toByteArray(fileInputStream), outputStream);
response.setHeader("Content-Disposition", "inline; filename= file");
outputStream.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}运行效果
设置头信息使浏览器下载文件或预览
强制浏览器下载
response.setHeader("content-disposition", "attachment;filename=" + realName);浏览器尝试打开,支持office online或浏览器预览pdf功能
response.setHeader("content-disposition", "inline;filename=" + realName);完整代码 : github
玩的开心！
作者：养码青年
出处：http://www.cnblogs.com/zhenghengbin/
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