java 后端生成PDF （html 转PDF）

maven准备的jar包：

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

java类：

import com.itextpdf.text.pdf.BaseFont;
import org.xhtmlrenderer.pdf.ITextFontResolver;
import org.xhtmlrenderer.pdf.ITextRenderer;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;

/**
 * 文件格式转换工具类
 *
 * @author zjl
 *
 * 2018-5-10 上午10:52:22
 */
public class HTMLtoPDFUtil {

    /**
     * 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 boolean html2pdf(String htmlFile, String pdfFile) throws Exception {
        String url = new File(htmlFile).toURI().toURL().toString();

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

        //解决中文支持
        ITextFontResolver fontResolver = renderer.getFontResolver();
        if("linux".equals(System.getProperty("os.name").toLowerCase())){
            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();
		return true;
    }


    public static void main(String[] args) {
        String htmlFile = "G:\\pdfDemo\\testpdf.html";
        String pdfFile = "G:\\pdfDemo\\test21.pdf";
        try {
            FileTypeConvertUtil.html2pdf(htmlFile, pdfFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

1.simsun.ttc 文件找不到问题

windows 自带有这个文件

linux 下载链接 :https://download.csdn.net/download/zangln/3179798

linux安装字体教程:https://www.cnblogs.com/xu-lei/p/5896789.html

如果没生成pdf无法显示中文请在html 加上一个样式:

style = “font-family: SimSun;”

HTML头部必须声明：

1 2	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html lang="en" xmlns="http://www.w3.org/1999/xhtml">

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

转换PDF后无法换行需要添加一个样式:

table {
			border-collapse: collapse;
			table-layout: fixed;
			word-break:break-all;
			font-size: 10px;
			width: 100%;
			text-align: center;
	}
	td {
		word-break:break-all;
		word-wrap : break-word;
	}

分页以及纸张大小设置

在body标签内加入

1	<div id="footer" style=""> Page <span id="pagenumber"/> of <span id="pagecount"/> </div>

添加样式

@page {
size:210mm 297mm;//纸张大小A4
margin: 0.25in;
-fs-flow-bottom: "footer";
-fs-flow-left: "left";
-fs-flow-right: "right";
border: thin solid black;
padding: 1em;
}
#footer {
font-size: 90%; font-style: italic;
position: absolute; top: 0; left: 0;
-fs-move-to-flow: "footer";
}
#pagenumber:before {
content: counter(page);
}
#pagecount:before {content: counter(pages);
}

参考链接:https://my.oschina.net/960823/blog/1588166