html转pdf，jsf实现下载功能

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第一步，html转pdf

依赖的jar包可以从这下载

http://download.csdn.net/detail/czj2015/9430534

html转pdf 的代码如下：

import java.io.File;import java.io.FileOutputStream;import java.io.OutputStream;import org.xhtmlrenderer.pdf.ITextFontResolver;import org.xhtmlrenderer.pdf.ITextRenderer;import com.lowagie.text.pdf.BaseFont;public class HtmltoPDF {public static void main(String[] args) throws Exception {// htmlToPdf();htmlToPdf2();// htmlToPdf3();}// 不支持中文public static void htmlToPdf() throws Exception {String inputFile = "f:/b.html";String url = new File(inputFile).toURI().toURL().toString();String outputFile = "f:/flying.pdf";OutputStream os = new FileOutputStream(outputFile);ITextRenderer renderer = new ITextRenderer();renderer.setDocument(url);renderer.layout();renderer.createPDF(os);os.close();}// 支持中文public static void htmlToPdf2() throws Exception {String outputFile = "F:/demo_3.pdf";OutputStream os = new FileOutputStream(outputFile);ITextRenderer renderer = new ITextRenderer();ITextFontResolver fontResolver = renderer.getFontResolver();fontResolver.addFont("C:/Windows/fonts/simsun.ttc",BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);StringBuffer html = new StringBuffer();// DOCTYPE 必需写否则类似于 这样的字符解析会出现错误html.append("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");html.append("<html xmlns=\"http://www.w3.org/1999/xhtml\">").append("<head>").append("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />").append("<style type=\"text/css\" mce_bogus=\"1\">body {font-family: SimSun;}</style>").append("</head>").append("<body>aaaaaaa测试啊测试</body>");html.append("</html>");renderer.setDocumentFromString(html.toString());// 解决图片的相对路径问题// renderer.getSharedContext().setBaseURL("file:/F:/teste/html/");renderer.layout();renderer.createPDF(os);System.out.println("======转换成功!");os.close();}public static void htmlToPdf3() throws Exception {String inputFile = "F:/b.html";String outFile = "F:/test.pdf";OutputStream os = null;os = new FileOutputStream(outFile);ITextRenderer renderer = new ITextRenderer();ITextFontResolver fontResolver = renderer.getFontResolver();fontResolver.addFont("C:/Windows/fonts/simsun.ttc",BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);String url = new File(inputFile).toURI().toURL().toString();System.out.println("=============url: " + url);renderer.setDocument(url);renderer.layout();renderer.createPDF(os);System.out.println("======转换成功!");os.close();}}

我使用的是第二种方法，由自己拼接html来生成pdf 。此处需要注意html的开头注释部分，还有html格式不能错误。

第二步：提供下载功能

原先的想法是，网页上点击了下载按钮以后，托管bean开始生成pdf，生成结束后直接给页面跳出下载。

然而后来发现这种方法行不通。因为jsf下载功能只有控件 commandButton和commandLink可以实现。其实用js来控制来onclick按钮也可以解决这个问题，但是这样做的

话调用的就不是一个托管bean了。

提供下载的代码如下：

public void downPdf() {//String filePath = this.vals;String filePath = "f:/demo_3.pdf";System.out.println("filePath" + filePath);File file = new File(filePath);FacesContext context = FacesContext.getCurrentInstance();HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();response.setContentType("application/msdownload");response.setCharacterEncoding("UTF-8");response.setContentLength(new Long(file.length()).intValue());// 文件长度response.setHeader("Content-Disposition", "attachment; filename=\""+ file.getName() + "\"");// 文件名ServletOutputStream out = null;FileInputStream fis = null;BufferedReader reader = null;String readLine = null;try {out = response.getOutputStream();fis = new FileInputStream(file);reader = new BufferedReader(new InputStreamReader(fis));while ((readLine = reader.readLine()) != null) {try {out.write(readLine.getBytes());} catch (Exception e) {}}out.flush();context.responseComplete();System.out.println("提供下载结束");} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}

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