将HTML文件转换为图片应用开发

　　　

项目使用的基本思路如下:

　　　在项目中发送传真的,传真的信息是由ｆｒｅｅｍａｒｋｅｒ模板框架生成形成的html文件,通过ｆｒｅｅｍａｒｋｅｒ获取html文件的內容,通过ＳＷｉｎｇ中组件html信息转换为图片基本.

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JTextPane;
import javax.swing.plaf.basic.BasicEditorPaneUI;

/**
 * 通过JTextPane目的显示html信息并绘制图片信息
 *
 * @author longgangbai
 *
 */
public class PrintView {
 public JTextPane panel = null;

 public PrintView(JTextPane panel) {
  this.panel = panel;
 }

 /**
  * 绘制图片的方法
  *
  * @param g
  * @param hPage
  * @param pageIndex
  * @return
  */
 public boolean paintPage(Graphics g, int hPage, int pageIndex) {
  Graphics2D g2 = (Graphics2D) g;
  Dimension d = ((BasicEditorPaneUI) panel.getUI())
    .getPreferredSize(panel);
  double panelHeight = d.height;
  double pageHeight = hPage;
  int totalNumPages = (int) Math.ceil(panelHeight / pageHeight);
  g2.translate(0f, -(pageIndex - 1) * pageHeight);
  panel.paint(g2);
  boolean ret = true;

  if (pageIndex >= totalNumPages) {
   ret = false;
   return ret;
  }
  return ret;
 }
}
/**
 * ＨＴＭＬ转换图片的方式
 *
 * @author longgangbai
 *
 */
public class GraphUtils {
 private final static Logger logger = Logger.getLogger(GraphUtils.class);
 public static int DEFAULT_IMAGE_WIDTH = 1024;
 public static int DEFAULT_IMAGE_HEIGHT = 768;

 /**
  * 将ＢｕｆｆｅｒｅｄＩｍａｇｅ转换为图片的信息
  *
  * @param image
  * @return
  */
 public static String toJpeg(BufferedImage image) {
  // 获取图片文件的在服务器的路径
  String imageName = FaxUtils.getFaxServerFileDir() + File.separator
    + FaxUtils.getSytemFormatDate() + DEFAULT_IMAGE_FORMATSYTLE;
  try {
   ByteArrayOutputStream baos = new ByteArrayOutputStream();
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(baos);
   JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
   param.setQuality(1.0f, false);
   encoder.setJPEGEncodeParam(param);
   encoder.encode(image);
   byte[] buff = baos.toByteArray();
   baos.close();
   // 将字节流写入文件保存为图片
   FileUtils.writeByteArrayToFile(new File(imageName), buff);
   System.out.println("保存成功!....");
  } catch (Exception ex) {
   logger.error("保存删除图片失败:" + ex.getMessage());
  }
  return imageName;
 }

 /**
  * html转换为ｊｐｅｇ文件
  *
  * @param bgColor
  *            图片的背景色
  * @param html
  *            html的文本信息
  * @param width
  *            显示图片的Ｔｅｘｔ容器的宽度
  * @param height
  *            显示图片的Ｔｅｘｔ容器的高度
  * @param eb
  *            設置容器的边框
  * @return
  * @throws Exception
  */
 private static ArrayList<String> html2jpeg(Color bgColor, String html,
   int width, int height, EmptyBorder eb) throws Exception {
  ArrayList<String> ret = new ArrayList<String>();
  try {
   JTextPane tp = new JTextPane();
   tp.setSize(width, height);
   if (eb == null) {
    eb = new EmptyBorder(0, 50, 0, 50);
   }
   if (bgColor != null) {
    tp.setBackground(bgColor);
   }
   if (width <= 0) {
    width = DEFAULT_IMAGE_WIDTH;
   }
   if (height <= 0) {
    height = DEFAULT_IMAGE_HEIGHT;
   }
   tp.setBorder(eb);
   tp.setContentType("text/html");
   tp.setText(html);
   PrintView m_printView = new PrintView(tp);
   int pageIndex = 1;
   boolean bcontinue = true;
   while (bcontinue) {
    BufferedImage image = new java.awt.image.BufferedImage(width,
      height, java.awt.image.BufferedImage.TYPE_INT_RGB);
    Graphics g = image.getGraphics();
    g.setClip(0, 0, width, height);
    bcontinue = m_printView.paintPage(g, height, pageIndex);
    g.dispose();
    String path = toJpeg(image);
    ret.add(path);
    pageIndex++;
   }
  } catch (Exception ex) {
   throw ex;
  }
  return ret;
 }

 /**
  *
  * @param bgColor
  * @param html
  * @param width
  * @param height
  * @return
  * @throws Exception
  */
 public static ArrayList<String> toImages(Color bgColor, String[] htmls,
   int width, int height) throws Exception {
  ArrayList<String> imglist = new ArrayList<String>();
  for (int i = 0; i < htmls.length; i++) {
   imglist.addAll(html2jpeg(bgColor, htmls[i], width, height,
     new EmptyBorder(0, 0, 0, 0)));
  }
  return imglist;
 }

 /**
  *
  * @param bgColor
  * @param html
  * @param width
  * @param height
  * @return
  * @throws Exception
  */
 public static ArrayList<String> toImages(Color bgColor, String html,
   int width, int height) throws Exception {
  return html2jpeg(bgColor, html, width, height, new EmptyBorder(0, 0, 0,
    0));
 }

 /**
  * 将一個html转换为图片
  *
  * @param htmls
  * @return
  * @throws Exception
  */
 public static ArrayList<String> toImages(String html) throws Exception {
  return html2jpeg(null, html, DEFAULT_IMAGE_WIDTH, DEFAULT_IMAGE_WIDTH,
    new EmptyBorder(0, 0, 0, 0));
 }

 /**
  * 将多个html转换图片
  *
  * @param htmls
  * @return
  * @throws Exception
  */
 public static ArrayList<String> toImages(String[] htmls) throws Exception {
  ArrayList<String> imglist = new ArrayList<String>();
  for (int i = 0; i < htmls.length; i++) {
   imglist.addAll(html2jpeg(null, htmls[i], DEFAULT_IMAGE_WIDTH,
     DEFAULT_IMAGE_WIDTH, new EmptyBorder(0, 0, 0, 0)));
  }
  return imglist;
 }
}