第一次嘗試：用awt 包將HTML源碼轉換為圖片

優點：不依賴任何外部JAR包，缺點：對CSS的支持比較差，復雜點的樣式就無法展示，且不支持外部引入的CSS和寫在style中的CSS，只能寫在標簽上

Eg:

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.util.ArrayList;

import java.util.UUID;

import javax.swing.JTextPane;

import javax.swing.border.EmptyBorder;

import javax.swing.plaf.basic.BasicEditorPaneUI;

import org.apache.commons.io.FileUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGEncodeParam;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class GraphUtils {

private final static Log log = LogFactory.getLog(GraphUtils.class);

public static int DEFAULT_IMAGE_WIDTH = 1000;

//默認值最好設置大點，因為我們再導之前，不知道這個流有多大，如果過小，則生成的圖片后面的為黑色，因為流沒有讀取完整

public static int DEFAULT_IMAGE_HEIGHT = 200;

public static boolean paintPage(Graphics g, int hPage, int pageIndex, JTextPane panel) {

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;

}

/**

* 將BufferedImage轉換為圖片的信息

*/

public static String toJpeg(BufferedImage image) {

// 獲取圖片文件的在服務器的路徑

String imageName = "G:\\" + UUID.randomUUID().toString() + ".jpg";

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();

// 將字節流寫入文件保存為圖片

FileUtils.writeByteArrayToFile(new File(imageName), buff);

} catch (Exception ex) {

log.error("保存刪除圖片失敗:" + ex.getMessage());

}

return imageName;

}

/**

* html轉換為ｊｐｅｇ文件

* @param bgColor 圖片的背景色

* @param html html的文本信息

* @param width 顯示圖片的Ｔｅｘｔ容器的寬度

* @param height 顯示圖片的Ｔｅｘｔ容器的高度

* @param eb 設置容器的邊框

* @return

* @throws Exception

*/

private static ArrayList html2jpeg(Color bgColor, String html, int width, int height, EmptyBorder eb)

throws Exception {

ArrayList ret = new ArrayList();

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);

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 = paintPage(g, height, pageIndex, tp);

g.dispose();

String path = toJpeg(image);

ret.add(path);

pageIndex++;

}

} catch (Exception ex) {

throw ex;

}

return ret;

}

/**

* 將一個html轉換為圖片

* @param htmls

* @return

* @throws Exception

*/

public static ArrayList toImages(String html) throws Exception {

return html2jpeg(Color.white, html, DEFAULT_IMAGE_WIDTH, DEFAULT_IMAGE_HEIGHT, new EmptyBorder(0, 0, 0, 0));

}

TestCase:

@RunWith(SpringJUnit4ClassRunner.class)

@WebAppConfiguration

@ContextConfiguration(locations = { "classpath*:spring/application.xml", "classpath*:spring/plugin-*.xml" })

public class GraphUtilsTest extends TestCase {

@Autowired

private TaskService taskService;

@Autowired

private VelocitySimpleRelolver velocitySimpleRelolver;

@Test

public void testHtml2Image() {

try {

String imageTemplateFile = "mail/weekly/mile_schedule_task.vm";

//郵件內容

Map velocityData = new HashMap();

String projId = "6a9fb54e3439453e86e819a4d46fdafb";

MileSchedule mileSchedule = taskService.getMileSchedule(projId);

velocityData.put("mileSchedule", mileSchedule);

String htmlstr = velocitySimpleRelolver.relolve(imageTemplateFile, velocityData);

Assert.assertNotNull(htmlstr);

GraphUtils.toImages(htmlstr);

} catch (Exception e) {

e.printStackTrace();

}

}

}

Second: 利用html2image組件

優點：方便，代碼簡單缺點：CSS支持極差，比不上Java自身的轉化

maven引入：

gui.ava

html2image

0.9

TestCase:

@RunWith(SpringJUnit4ClassRunner.class)

@WebAppConfiguration

@ContextConfiguration(locations = { "classpath*:spring/application.xml", "classpath*:spring/plugin-*.xml" })

public class Html2ImageTest extends TestCase {

@Autowired

private TaskService taskService;

@Autowired

private VelocitySimpleRelolver velocitySimpleRelolver;

@Test

public void testHtml2Image() {

try {

String imageTemplateFile = "mail/weekly/mile_schedule_task.vm";

//郵件內容

Map velocityData = new HashMap();

String projId = "6a9fb54e3439453e86e819a4d46fdafb";

MileSchedule mileSchedule = taskService.getMileSchedule(projId);

velocityData.put("mileSchedule", mileSchedule);

String htmlstr = velocitySimpleRelolver.relolve(imageTemplateFile, velocityData);

System.out.println(htmlstr);

Assert.assertNotNull(htmlstr);

String imageName = "G:/weekly_mile_" + projId + ".png";

HtmlImageGenerator imageGenerator = new HtmlImageGenerator();

imageGenerator.setSize(new Dimension(1000, 200));

imageGenerator.loadHtml(htmlstr);

imageGenerator.getBufferedImage();

imageGenerator.saveAsImage(imageName);

} catch (Exception e) {

e.printStackTrace();

}

}

@Test

public void testImage() {

HtmlImageGenerator imageGenerator = new HtmlImageGenerator();

imageGenerator.setSize(new Dimension(1000, 200));

imageGenerator.loadUrl("http://www.baidu.com");

imageGenerator.getBufferedImage();

imageGenerator.saveAsImage("G:/aaa.png");

}

} Third:DJNativeSwing

參考：http://blog.csdn.net/cping1982/article/details/5353049

其中：JAR包下載地址：

此地址下down org.eclipse.swt 包，選擇適合你的開發環境

注意：swt 包針對不同的環境有不同的要求，windows與Linux下的不同，使用maven引入時采用properties方式，將下載的包放入你的maven庫，然后在POM中進行maven引入

eg:

chrriis.dj.nativeswing

DJNativeSwing

1.0.2

chrriis.dj.nativeswing.swt

DJNativeSwing-SWT

1.0.2

${swt.groupId}

${swt.artifactId}

4.3

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.concurrent.Semaphore;

import javax.imageio.ImageIO;

import javax.swing.JPanel;

import chrriis.dj.nativeswing.swtimpl.NativeComponent;

import chrriis.dj.nativeswing.swtimpl.NativeInterface;

import chrriis.dj.nativeswing.swtimpl.components.JWebBrowser;

import chrriis.dj.nativeswing.swtimpl.components.WebBrowserAdapter;

import chrriis.dj.nativeswing.swtimpl.components.WebBrowserEvent;

public class DJNativeSwingUtils extends JPanel {

private static final long serialVersionUID = 8675106494733722832L;

// 行分隔符

final static public String LS = System.getProperty("line.separator", "/n");

// 文件分割符

final static public String FS = System.getProperty("file.separator", "//");

//以javascript腳本獲得網頁全屏后大小

final static StringBuffer jsDimension;

static {

jsDimension = new StringBuffer();

jsDimension.append("var width = 0;").append(LS);

jsDimension.append("var height = 0;").append(LS);

jsDimension.append("if(document.documentElement) {").append(LS);

jsDimension.append(" width = Math.max(width, document.documentElement.scrollWidth);").append(LS);

jsDimension.append(" height = Math.max(height, document.documentElement.scrollHeight);").append(LS);

jsDimension.append("}").append(LS);

jsDimension.append("if(self.innerWidth) {").append(LS);

jsDimension.append(" width = Math.max(width, self.innerWidth);").append(LS);

jsDimension.append(" height = Math.max(height, self.innerHeight);").append(LS);

jsDimension.append("}").append(LS);

jsDimension.append("if(document.body.scrollWidth) {").append(LS);

jsDimension.append(" width = Math.max(width, document.body.scrollWidth);").append(LS);

jsDimension.append(" height = Math.max(height, document.body.scrollHeight);").append(LS);

jsDimension.append("}").append(LS);

jsDimension.append("return width + ':' + height;");

}

public static JPanel createContent(String htmlStr, final String fileName, final Semaphore semp) {

//瀏覽器面板

JPanel webBrowserPanel = new JPanel(new BorderLayout());

//swing的內嵌瀏覽器

final JWebBrowser webBrowser = new JWebBrowser();

//隱藏所有的欄

webBrowser.setBarsVisible(false);

//向瀏覽器寫入html內容

webBrowser.setHTMLContent(htmlStr);

//將瀏覽器嵌入瀏覽器面板

webBrowserPanel.add(webBrowser, BorderLayout.CENTER);

//向瀏覽器增加監聽事件

webBrowser.addWebBrowserListener(new WebBrowserAdapter() {

// 監聽加載進度

public void loadingProgressChanged(WebBrowserEvent e) {

// 當加載完畢時

if (e.getWebBrowser().getLoadingProgress() == 100) {

try {

//執行JS獲取圖片的寬度，高度

String result = (String) webBrowser.executeJavascriptWithResult(jsDimension.toString());

int index = result == null ? -1 : result.indexOf(":");

NativeComponent nativeComponent = webBrowser.getNativeComponent();

//獲取圖片的原始尺寸

Dimension originalSize = nativeComponent.getSize();

//根據JS返回結果設定新的圖片尺寸

Dimension imageSize = new Dimension(Integer.parseInt(result.substring(0, index)), Integer

.parseInt(result.substring(index + 1)));

//計算圖片的新尺寸

imageSize.width = Math.max(originalSize.width, imageSize.width);

imageSize.height = Math.max(originalSize.height, imageSize.height);

nativeComponent.setSize(imageSize);

//創建一個不帶透明色的BufferedImage對象

BufferedImage image = new BufferedImage(imageSize.width, imageSize.height,

BufferedImage.TYPE_INT_RGB);

//對瀏覽器中圖片進行繪色

nativeComponent.paintComponent(image);

//截圖

image = image.getSubimage(0, 0, imageSize.width - 25, imageSize.height);

try {

// 輸出圖像

ImageIO.write(image, "jpg", new File(fileName));

} catch (IOException ex) {

ex.printStackTrace();

}

} finally {

// 退出操作 :釋放線程

NativeInterface.close();

semp.release();

}

}

}

});

return webBrowserPanel;

}

} service調用：

private String createImage(final String htmlStr, final Semaphore semaphore) {

final String fileName = FileUtils.getNewFileName("jpg");

NativeInterface.open();

UIUtils.setPreferredLookAndFeel();

SwingUtilities.invokeLater(new Runnable() {

public void run() {

// SWT組件轉Swing組件，不初始化父窗體將無法啟動webBrowser

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// 加載指定頁面

frame.getContentPane().add(DJNativeSwingUtils.createContent(htmlStr, fileName, semaphore),

BorderLayout.CENTER);

// 僅初始化，但不顯示

frame.invalidate();

frame.pack();

frame.setVisible(false);

}

});

// 在MAC上使用時，因為MAC不支持雙進程，僅支持進程內模式，調用此方法進行事件調度。windows和Linux可以忽略此事件調度

//NativeInterface.runEventPump();

return new File(fileName).getAbsolutePath();

}

private int fillPicture(HSSFSheet sheet, Report report, int startRow) throws IOException {

if(null == weekly.getMileSchedule()){

return startRow + 1;

}

// 將高度設置為圖片的高度

HSSFRow pictureRow = sheet.getRow(startRow);

pictureRow.setHeightInPoints(162);

String htmlStr = this.createHtml(report);

String imagePath = null;

final Semaphore semp = new Semaphore(1);//設置信號量

try {

semp.acquire();

// 子線程生成圖片

imagePath = this.createImage(htmlStr, semp);

// 等待子線程釋放信號量

semp.acquire();

} catch (InterruptedException e) {

LOG.error("", e);

} finally {

semp.release();

}

try {

ExcelExportUtils.insertPicture(sheet, startRow, (short) 0, (short) 15, imagePath);

} catch (Exception e) {

e.printStackTrace();

} finally {

// delete 文件

new File(imagePath).delete();

}

return ++startRow;

}

windows 下截圖正常，Linux下異常，Linux下必須安裝Mollizia內核的瀏覽器，在服務器上安裝了一個Firefox后，也必須安裝圖形界面，剛開始采用安裝虛擬x-server,但是在CentOS 下安裝各種依賴，嘗試安裝圖形界面后tomcat也必須在圖形界面下啟動才能正常截圖，后廢棄此種方式，采用java原生繪圖方式，下一篇博文介紹

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