使用xmlworker通过html生成pdf
xmlworker是一个基于iText的xml生成pdf工具。使用xmlworker是非常简单的,思路也很清晰。获取模板->拼装模板->生成pdf。但是在过程中还是有一些小问题需要注意下。
首先中文的问题,xmlworker默认是不支持中文的,需要修改源代码重新打包才能支持亚洲字体(修改详情)。
也可以下载我已经编好的包:
修改com.itextpdf.tool.xml.css.apply.ChunkCssApplier.java 中的 public Chunk apply(final Chunk c, final Tag t) :
Font f = applyFontStyles(t); // for chinese charater display @www.micmiu.com if (null != HTMLUtils.bfCN && HTMLUtils.isChinese(c.getContent())) { f = new Font(HTMLUtils.bfCN, f.getSize(), f.getStyle(), f.getColor()); } float size = f.getSize(); ......
在com.itextpdf.tool.xml.html.HTMLUtils.java 中 增加下面用于中文字符判断的方法:
public static BaseFont bfCN = null; static { try { bfCN = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); } catch (Exception e) { } } // add by Michael more see:http://www.micmiu.com private static final boolean isChinese(char c) { Character.UnicodeBlock ub = Character.UnicodeBlock.of(c); if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) { return true; } return false; } // add by Michael more see:http://www.micmiu.com public static final boolean isChinese(String strName) { char[] ch = strName.toCharArray(); for (int i = 0; i < ch.length; i++) { char c = ch[i]; if (isChinese(c)) { return true; } } return false; }
其次,在写html模板的时候,因为xmlworker支持的CSS样式极少,所以模板内容要尽量简单。对于DOCTYPE和html标签的约束页比较严格。我使用的是
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <br /><html xmlns="http://www.w3.org/1999/xhtml">
。
对于一个标签中含有中文、数字或英文的时候,很可能会出现字体变形。这是因为xmlworker在渲染PDF的时候是以html的标签为单位的。只要把中文和英文分隔在不同的标签就可以了。
最后贴上代码作为参考:
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.StringReader; import java.io.StringWriter; import java.io.Writer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.itextpdf.text.Document; import com.itextpdf.text.DocumentException; import com.itextpdf.text.pdf.PdfWriter; import com.itextpdf.tool.xml.XMLWorkerHelper; import freemarker.template.Configuration; import freemarker.template.DefaultObjectWrapper; import freemarker.template.Template; import freemarker.template.TemplateException; public class PDFOperation { public static void main(String[] args) throws Exception { // 获取html内容 String html = getHtml(); // 生成pdf createPdf(html); } public static void createPdf(String html)throws DocumentException, IOException { String file = "E:/detail.pdf"; Document doc = new Document(); PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(file)); doc.open(); XMLWorkerHelper.getInstance().parseXHtml(writer, doc,new StringReader(html)); doc.close(); } public static String getHtml() throws IOException, TemplateException{ Configuration cfg = new Configuration(); cfg.setDirectoryForTemplateLoading(new File("E:/templatedir/")); cfg.setObjectWrapper(new DefaultObjectWrapper()); Template t = cfg.getTemplate("test.ftl"); Writer out = new StringWriter(); Map<String,Object> map = new HashMap<String,Object>(); Map<String,Object> req = new HashMap<String,Object>(); req.put("title","XXX"); req.put("ctime", "2014.05.06"); req.put("province", "北京"); List<Map<String,Object>> files = new ArrayList<Map<String,Object>>(); Map<String,Object> file1 = new HashMap<String,Object>(); Map<String,Object> file2 = new HashMap<String,Object>(); file1.put("url", "http://xxx"); file1.put("name", "FreeMarker_Manual_zh_CN.pdf"); file1.put("ext","pdf"); file2.put("url", "http://xxx"); file2.put("name", "OReilly.Redis.Cookbook.2011.pdf"); file2.put("ext","pdf"); files.add(file1); files.add(file2); map.put("files", files); map.put("map",map); t.process(map, out); out.flush(); return out.toString(); } }
ftl模板:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> </head> <body> <div style="padding:24px;color:#3a3b3b;background-color:#f4f4f4;line-height:28px;"> <h1 style="color:#98989a;font-weight:bold;font-size:24px;text-align:left;">DO NOT COPY</h1> <div style="background-color:#fff;padding:16px 24px;width:100%;"> <h1>${map.title}</h1> <h5 style="color:#848484;font-weight:normal;"><span>${map.ctime}</span></h5> </div> <div style="height:24px;"> </div> <div style="background-color:#fff;padding:16px 24px;width:100%;"> <h2>说明</h2> <div style="height:1px;background-color:#dbdbdb;width:100%;"> </div> <div style="height:16px;width:100%;"> </div> <ul style="list-style-type:none;margin:0px;padding:0px;padding-left:24px;"> <li><span style="color:#848484">地区</span> ${map.province?default('')}</li> </ul> <#if files ?exists > <h3>附件</h3> <div style="background-color:#eee;width:100%;padding:12px;padding-left:24px;">文件</div> <ul style="list-style-type:none;margin:0px;padding:0px;padding-left:24px;padding-right:24px;"> <#list files as f> <li style="margin:0px;padding:12px 0;"><a href="${f.url}"><span>${f.name}</span>.<span>${f.ext}</span></a></li> </#list> </ul> </#if> </div> <h1 style="color:#98989a;font-weight:bold;font-size:24px;text-align:right;">DO NOT COPY</h1> </div> </body> </html>
以下是可能提供帮助的资料:
支持的样式表
HTML生成PDF在线测试
itextpdf in action中的源码样例
编译好的xmlworker-cn.jar,如果使用maven并有私库,需要部署到私库。version=5.5.0,groupId=com.itextpdf.tool,artifactId=xmlworker-cn