Java实现HTML页面转PDF解决方案

添加maven依赖

<dependency>
    <groupId>com.itextpdf.tool</groupId>
    <artifactId>xmlworker</artifactId>
    <version>5.5.9</version>
</dependency>

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itext-asian</artifactId>
    <version>5.2.0</version>
</dependency>

<dependency>
    <groupId>org.xhtmlrenderer</groupId>
    <artifactId>flying-saucer-pdf-itext5</artifactId>
    <version>9.0.3</version>
</dependency>

代码实现

public class FileTypeConvertUtil {
    /**
     * 将HTML转成PD格式的文件。html文件的格式比较严格
     * @param htmlFile
     * @param pdfFile
     * @throws Exception
     */
    // <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
    public static void html2pdf(String htmlFile, String pdfFile) throws Exception {
        // step 1
        String url = new File(htmlFile).toURI().toURL().toString();
        System.out.println(url);

        // step 2
        OutputStream os = new FileOutputStream(pdfFile);
        ITextRenderer renderer = new ITextRenderer();
        renderer.setDocument(url);

        // 图片为本地的绝对路径时,如http://www.baidu.com/a.jpg,则为<img src="a.jpg" />
        renderer.getSharedContext().setBaseURL("http://www.baidu.com/");
        // 图片为HTTP链接时，src只需填写相对路径，如D:/a.jpg,则为<img src="a.jpg" />
        renderer.getSharedContext().setBaseURL("file:/D:/");

        // step 3 解决中文支持
        ITextFontResolver fontResolver = renderer.getFontResolver();
        if("linux".equals(getCurrentOperatingSystem())){
            fontResolver.addFont("/usr/share/fonts/chiness/simsun.ttc", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        }else{
            fontResolver.addFont("c:/Windows/Fonts/simsun.ttc", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
        }

        renderer.layout();
        renderer.createPDF(os);
        os.close();

        System.out.println("create pdf done!!");

    }

    public static String getCurrentOperatingSystem(){
        String os = System.getProperty("os.name").toLowerCase();
        System.out.println("---------当前操作系统是-----------" + os);
        return os;
    }


    public static void main(String[] args) {
        String htmlFile = "E:/ami.html";
        String pdfFile = "E:/ami.pdf";
        try {
            FileTypeConvertUtil.html2pdf(htmlFile, pdfFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

注意：

输入的HTML页面必须是标准的XHTML页面。页面的顶上必须是这样的格式：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

语法必须是标准的HTML语法：所有标签都必须闭合
CSS中必须指定字体，然后在java代码中设置相应的字体