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java 抓取网页缩略图 例子源码

Android平台开发

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  • 开发语言:Java
  • 实例大小:0.13M
  • 下载次数:16
  • 浏览次数:538
  • 发布时间:2015-12-11
  • 实例类别:Android平台开发
  • 发 布 人:crazycode
  • 文件格式:.zip
  • 所需积分:2
 相关标签: 缩略图 java 网页 源码

实例介绍

【实例简介】

【实例截图】

【核心代码】

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/*******************************************************************************
 * $Header$
 * $Revision$
 * $Date$
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved.
 *
 * Created on 2015-6-2
 *******************************************************************************/
 
 
package top.appcity.websnapasimg.utils;
 
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
 
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import chrriis.dj.nativeswing.NSOption;
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 HtmlCaptureUtil {
    private static Logger logger = LoggerFactory.getLogger(HtmlCaptureUtil.class);
    // 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脚本获得网页全屏后大小
    final static StringBuffer jsDimension;
     
    private static JWebBrowser webBrowser=null;
    private static int maxWidth=1280;
    private static int maxHeight=953;
    private static ImageOutputStream ops = null;
    private static final Lock lock = new ReentrantLock();
    private static final Condition finishCondition = lock.newCondition();
    private static String formatName = "png";
     
    static {
        jsDimension = new StringBuffer();
        jsDimension.append("var width = 1280;").append(LS);
        jsDimension.append("var height = 953;").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 synchronized boolean generatePng(final String url,OutputStream stream,final String imgType) {
        if (null == webBrowser) {
            init();
        }
        try {
             ops = ImageIO.createImageOutputStream(stream);
        } catch (IOException e) {
            logger.error("Can't create output stream! 不能创建!");
        }
        formatName = imgType;
        boolean reault = false;
        SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
        webBrowser.navigate(url);
        }});
        logger.info("阻塞等待结果");
        lock.lock();
        try {
            reault = finishCondition.await(5, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally{
            lock.unlock();
        }
        logger.info("结果返回");
         
        return reault;
    }
 
    private static void init(){
        NativeInterface.open();
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
             
                // SWT组件转Swing组件,不初始化父窗体将无法启动webBrowser
                JFrame frame = new JFrame("以DJ组件保存指定网页截图");
                logger.info("初始化webBrowser");
                webBrowser = new JWebBrowser(new NSOption(null));
//              fileName = System.currentTimeMillis()   ".png";
                //webBrowser.navigate("http://10.19.105.164:7030/eos-governor/governor/user/login.jsp");
                webBrowser.addWebBrowserListener(new WebBrowserAdapter() {
                    // 监听加载进度
                    public void loadingProgressChanged(WebBrowserEvent e) {
                        // 当加载完毕时
                        logger.info("监听加载进度");
                        if (e.getWebBrowser().getLoadingProgress() == 100) {
                            logger.info("加载完毕");
                            lock.lock();
//                          fileName = System.currentTimeMillis()   ".png";
                            String result = (String) webBrowser
                                    .executeJavascriptWithResult(jsDimension.toString());
                            int index = result == null ? -1 : result.indexOf(":");
                            NativeComponent nativeComponent = webBrowser
                                    .getNativeComponent();
                            Dimension originalSize = nativeComponent.getSize();
                            Dimension imageSize = new Dimension(Integer.parseInt(result
                                    .substring(0, index)), Integer.parseInt(result
                                    .substring(index   1)));
                            imageSize.width = Math.max(originalSize.width,
                                    imageSize.width   50);
                            imageSize.height = Math.max(originalSize.height,
                                    imageSize.height   50);
                            nativeComponent.setSize(imageSize);
                            BufferedImage image = new BufferedImage(imageSize.width,
                                    imageSize.height, BufferedImage.TYPE_INT_RGB);
                            nativeComponent.paintComponent(image);
                            nativeComponent.setSize(originalSize);
                            // 当网页超出目标大小时
                            if (imageSize.width > maxWidth
                                    || imageSize.height > maxHeight) {
                                //截图部分图形
                                image = image.getSubimage(0, 0, maxWidth, maxHeight);
                                /*此部分为使用缩略图
                                int width = image.getWidth(), height = image
                                    .getHeight();
                                 AffineTransform tx = new AffineTransform();
                                tx.scale((double) maxWidth / width, (double) maxHeight
                                        / height);
                                AffineTransformOp op = new AffineTransformOp(tx,
                                        AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
                                //缩小
                                image = op.filter(image, null);*/
                            }
                            try {
                                // 输出图像
                                ImageIO.write(image, "png", new File("D://tmp/random.png"));
                                //logger.info("ops:" ops.toString());
                                ImageIO.write(image, formatName, ops);
                                finishCondition.signalAll();
                            } catch (IOException ex) {
                                ex.printStackTrace();
                                logger.error("生成异常",ex);
                            }finally{
                                lock.unlock();
                                //ops = null;
                                /*if (null !=ops) {
                                    try {
                                        ops.flush();
                                    } catch (IOException e1) {
                                        logger.error("关闭流异常",e1);
                                    }
                                }*/
                            }
                            logger.info("结束");
                             
                            // 退出操作
                            //System.exit(0);
                        }
                    }
                });
                JPanel webBrowserPanel = new JPanel(new BorderLayout());
                webBrowserPanel.add(webBrowser, BorderLayout.CENTER);
                // 加载google,最大保存为640x480的截图
                frame.getContentPane().add(webBrowserPanel, BorderLayout.CENTER);
                frame.setSize(800, 600);
                // 仅初始化,但不显示
                frame.invalidate();
                frame.pack();
                frame.setVisible(false);
            }
        });
        //NativeInterface.runEventPump();
    }
}

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java 抓取网页缩略图 例子源码

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第 1 楼 xiaoqing2305 发表于: 2020-03-21 20:01 51
能有maven中下载不到的springside、javahost的jar包提供一下就完美了,maven仓库中下载不到。

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