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一次java匯出pdf的經歷

近期由於工作需要,需要將html程式碼匯入到pdf中,經過了幾種pdf的方案對比後發現IText是最簡單和便捷的一種方式,於是乎採用了Itext。

PDF生成

第一步:匯入Maven依賴

<!--pdf生成工具類-->
      <dependency>
          <groupId>com.itextpdf</groupId>
          <artifactId>itextpdf</artifactId>
          <version>5.4.2</version>
</dependency> <dependency> <groupId>com.itextpdf.tool</groupId> <artifactId>xmlworker</artifactId> <version>5.4.1</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</artifactId> <
version>9.0.3</version> </dependency>

第二步:直接上程式碼

public static void main(String[] args) throws IOException
    {
        String html = PDFKit.readFileByUrl("http://127.0.0.1/export/1/1"); // 將html程式碼讀取到html字串中

        try {
            Document document = new Document();
            PdfWriter mPdfWriter = PdfWriter.getInstance(document, new FileOutputStream(new File("C:\\data\\3.pdf")));
            document.open();
            ByteArrayInputStream bin = new ByteArrayInputStream(html.getBytes());
            XMLWorkerHelper.getInstance().parseXHtml(mPdfWriter, document, bin, null, new ChinaFontProvide());
            System.out.println("生成完畢");
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static final class ChinaFontProvide implements FontProvider
    {

        @Override public boolean isRegistered(String s)
        {
            return false;
        }

        @Override public Font getFont(String arg0, String arg1, boolean arg2, float arg3, int arg4, BaseColor arg5)
        {
            BaseFont bfChinese = null;
            try
            {
                bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
            Font FontChinese = new Font(bfChinese, 12, Font.NORMAL);
            return FontChinese;
        }
    }

另附PDFKit.java工具類

public static String readFileByUrl(String urlStr) {
        String res=null;
        try {
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            //設定超時間為3秒
            conn.setConnectTimeout(3*1000);
            //防止遮蔽程式抓取而返回403錯誤
            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            //得到輸入流
            InputStream inputStream = conn.getInputStream();
            res = readInputStream(inputStream);
        } catch (Exception e) {
            log.error("通過url地址獲取文字內容失敗 Exception:" + e);
        }
        return res;
    }

    /**
     * 從輸入流中獲取字串
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static String readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        //System.out.println(new String(bos.toByteArray(),"utf-8"));
        return new String(bos.toByteArray(),"utf-8");
    }

至此 dpf就可以到下面路徑中查看了

C:\\data\\3.pdf

 

PDF預覽

只需在頁面中增加如下程式碼即可

<html>
<head>
    <title>Title</title>
</head>
<body>
<body style="height: 100%; width: 100%; overflow: hidden; margin: 0px;">
<embed width="100%" height="100%" src="pdf/3.pdf" type="application/pdf" internalinstanceid="25"/>
</body>
</body>
</html>

注意:html文件一定是<html>,不可以是<!DOCTYPE html> 不然body的100% 會失去效果

預覽效果

 

特別說明

如上程式碼生成的pdf,如果直接用工具開啟後發現字型是沒有問題,但是巢狀在網頁後發現字型竟然不是宋體了,下面我們來介紹下IText輸出中文的三種字型的選擇方式

1、使用iTextAsian.jar中的字型
    BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
2、使用Windows系統字型(TrueType)
        BaseFont.createFont("C:/WINDOWS/Fonts/SIMLI.TTF", BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);    
3、使用資源字型(ClassPath)
    BaseFont.createFont("/SIMYOU.TTF", BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);  //下面著重介紹

上面是設定字型的方式,剛剛咱們用的第一種方式,所以pdf預覽的的時候字型會變,改用下面的方式就沒有任何問題了,下面咱們說下標紅的是什麼意思

由於專案使用的是springboot,所以釋出到liunx後並不能直接從jar中查詢相應的字型,要改用ClassPathResource的方式獲取,因此更換程式碼如下:

 ClassPathResource resource = new ClassPathResource("static/STSONG.TTF");
 bfChinese = BaseFont.createFont(resource.getURL().toString(), BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

可將STSONG.TTF直接放入resources資料夾根目錄即可

這樣windows和linux都可以正確的生成pdf並預覽了。更換後的效果:

 

 另附:常用字型

//楷體字
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//simkai.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//方正舒體
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//FZSTK.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//方正姚體
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//FZYTK.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//仿宋體
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//黑體
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//SIMHEI.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//華文彩雲
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//STCAIYUN.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//華文仿宋
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//STFANGSO.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//華文細黑
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//STXIHEI.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//華文新魏
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//STXINWEI.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//華文行楷
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//STXINGKA.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//華文中宋
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//STZHONGS.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//隸書
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//SIMLI.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);//宋體-方正超大字符集
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//SURSONG.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
//幼圓
BaseFont bfComic = BaseFont.createFont("c://windows//fonts//SIMYOU.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);