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Itext PDF 导出

给我的文档系统添加了导出，本文记录PDF填坑小结。@javaxue

PDF导出的实现

导出流 

@RequestMapping(value = "export")
public void exportPdfNew(String mdContent, String type, HttpServletResponse response) {
response.reset();
response.setContentType("multipart/form-data");

String title = "file";
String author = "javaxue";
String mdFileContent = "";

ServletOutputStream out = null;
try {
byte[] fileBytes = null;

String htmlFile = StringEscapeUtils.unescapeHtml4(mdContent);

String cleanedHtmlFile = htmlFile.replace("<img", "<img style=\"display:inline-block;width:100%;max-width:650px;\" ");
cleanedHtmlFile = cleanHtml(cleanedHtmlFile);
fileBytes = convert(author, cleanedHtmlFile);
response.setHeader("Content-Disposition",
"inline; filename=\"" + title + "_" + System.currentTimeMillis() + ".pdf\"");

out = response.getOutputStream();
out.write(fileBytes);
out.close();
out.flush();
} catch (Exception e) {
System.out.println(e);
}
}

清理HTML 

public static String cleanHtml(String input) throws ConversionException, IOException {
InputStream stringAsStream;
try {
stringAsStream = new ByteArrayInputStream(input.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
throw ConversionException.HTML_TO_PDF_EXCEPTION;
}
HtmlCleaner cleaner = new HtmlCleaner();
TagNode node = cleaner.clean(stringAsStream, "UTF-8");

TagNode t = new TagNode("root");
t.addChild(node);

String html = cleaner.getInnerHtml(t);
return html;
}

页眉页脚支持 

public class HeaderFooterEvent extends PdfPageEventHelper {
String header, author;
PdfTemplate total;

public void setHeader(String header) {
this.header = header;
}

public void setAuthor(String author) {
this.author = author;
}

public void onOpenDocument(PdfWriter writer, Document document) {
total = writer.getDirectContent().createTemplate(30, 16);
}

//public void onEndPage(PdfWriter writer, Document document) {
//PdfPTable table = new PdfPTable(3);
//try {
//table.setWidths(new int[] { 60, 24, 2 });
//table.setTotalWidth(600);
//table.setLockedWidth(true);
//table.getDefaultCell().setFixedHeight(40);
//table.getDefaultCell().setBorder(Rectangle.BOX);
//table.getDefaultCell().setBorderWidth(0.1f);
//table.getDefaultCell().setBorderColor(Color.gray);
//
//table.addCell(header);
//table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
//table.addCell(String.format("Page %d of", writer.getPageNumber()));
//PdfPCell cell = new PdfPCell(Image.getInstance(total));
//cell.setBorder(Rectangle.BOTTOM);
//table.addCell(cell);
//table.writeSelectedRows(0, -1, 34, 803, writer.getDirectContent());
//
//} catch (DocumentException de) {
//throw new ExceptionConverter(de);
//}
//}

public void onEndPage(PdfWriter writer, Document document) {  
        
        PdfContentByte cb = writer.getDirectContent();  
        cb.saveState();  
  
        cb.beginText();  
        BaseFont bf = null;  
        try {  
            bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED);
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        cb.setColorFill(Color.GRAY);
        cb.setFontAndSize(bf, 10);  
        
          
        //Header  
        float x = document.top(-10);  
          
        //左  
        cb.showTextAligned(PdfContentByte.ALIGN_LEFT,  
                           "Author: " + author,   
                           document.left(), x, 0);  
        //中  
//        cb.showTextAligned(PdfContentByte.ALIGN_CENTER,  
//                            writer.getPageNumber()+ " page",  
//                           (document.right() + document.left())/2,  
//                           x, 0);  
        //右  
        cb.showTextAligned(PdfContentByte.ALIGN_RIGHT,  
                           "Email: suzhou.daipeng@gmail.com",  
                           document.right(), x, 0);  
  
        //Footer  
        float y = document.bottom(-10);  
  
        //左  
        cb.showTextAligned(PdfContentByte.ALIGN_LEFT,  
                           "Confidential",  
                           document.left(), y, 0);  
        //中  
cb.showTextAligned(PdfContentByte.ALIGN_CENTER,  
String.format("- %d -", writer.getPageNumber()),  
                   (document.right() + document.left())/2,  
                   y, 0);
        //右  
//        cb.showTextAligned(PdfContentByte.ALIGN_RIGHT,  
//                           "F-Right",  
//                           document.right(), y, 0);  
  
        cb.endText();  
          
        cb.restoreState();  
    }  

public void onCloseDocument(PdfWriter writer, Document document) {
ColumnText.showTextAligned(total, Element.ALIGN_LEFT, new Phrase(String.valueOf(writer.getPageNumber() - 1)), 2,
2, 0);

}
}

PDF中文支持

常见的中文支持思路:

  • 添加itext-asian.jar
  • Windows字体添加到项目中，导出时通过创建该字体对象；
  • classpath设置

简单demo如下: 

package oliver.itext.demo;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.OutputStream;  
import com.itextpdf.text.Document;  
import com.itextpdf.text.DocumentException;  
import com.itextpdf.text.Font;  
import com.itextpdf.text.Paragraph;  
import com.itextpdf.text.pdf.BaseFont;  
import com.itextpdf.text.pdf.PdfWriter;  
  
public class PDF2Chinese  
{  
    public static void main(String[] args) throws DocumentException, IOException  
    {  
        Document document = new Document();  
        OutputStream os = new FileOutputStream(new File("chinese.pdf"));  
        PdfWriter.getInstance(document,os);  
        document.open();  
        //方法一: 使用Windows系统字体(TrueType)  
        BaseFont baseFont = BaseFont.createFont("C:/Windows/Fonts/SIMYOU.TTF",BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);  
          
        //方法二: 使用iTextAsian.jar中的字体  
        //BaseFont baseFont = BaseFont.createFont("STSong-Light",BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);  
          
        //方法三: 使用资源字体(ClassPath)  
        ////BaseFont baseFont = BaseFont.createFont("/SIMYOU.TTF",BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);  
          
        Font font = new Font(baseFont);  
        document.add(new Paragraph("解决中文问题了！",font));  
        document.close();  
    }  
}

通过ITextFontResolvert添加字体

将Windows下fonts中所需要的字体拷贝到项目classpath下:

在代码中通过 ITextFontResolver 添加字体，具体代码如下: 

public byte[] convert(String author, String input)
throws ConversionException, IOException, com.lowagie.text.DocumentException {
ITextRenderer renderer = new ITextRenderer();
renderer.setDocumentFromString(new String(input.getBytes()));
renderer.setPDFVersion(PdfWriter.VERSION_1_7);
HeaderFooterEvent headerFooterEvent = new HeaderFooterEvent();
headerFooterEvent.setAuthor(author);
renderer.setPdfPageEvent(headerFooterEvent);
ITextFontResolver fontResolver = renderer.getFontResolver();
fontResolver.addFont(fontPath+"MSYH.TTC", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);// 微软雅黑
fontResolver.addFont(fontPath+"MSYHBD.TTC", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
fontResolver.addFont(fontPath+"MSYHL.TTC", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

renderer.layout();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
renderer.createPDF(outputStream);
byte[] bytes = outputStream.toByteArray();
return bytes;
}

PDF Linux环境下中文字体乱码

用itext生成pdf在windows环境下没有出现中文乱码而在linux下出现中文乱码，打开pdf查看pdf编码，以及显示的编码，发现编码并没有对应。原因是使用的宋体和微软雅黑在linux环境下并没有安装。

解决方法

  • 由于我这边PDF生成是通过HTML转化的，所以第一步先导出HTML，去查看需要用哪些字体文件；

  • 到windows环境下将所需字体拷贝到linux下。(simsun.ttc(宋体), msyf.ttf(微软雅黑))

  • 到linux环境下创建目录 

mkdir -pv /usr/share/fonts/chinese/TrueType

将字体放入目录下 

cd /usr/share/fonts/chinese/TrueType
chmod 755 * 为字体赋予可执行权限
  • 建立字体缓存 
mkfontscale (如果提示 mkfontscale: command not found，需自行安装 # yum install mkfontscale )
mkfontdir
fc-cache -fv (如果提示 fc-cache: command not found，则需要安装# yum install fontconfig )
  • reboot重启系统

经不同Linux环境测试，以上步骤必须顺序全部执行， 建立字体缓存必须是在字体拷贝完成之后顺序执行 mkfontscale，mkfontdir，fc-cache -fv

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