kilo
2 years ago
3 changed files with 211 additions and 33 deletions
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package org.springblade.common.utils; |
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import freemarker.cache.ByteArrayTemplateLoader; |
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import freemarker.template.Configuration; |
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import freemarker.template.Template; |
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import freemarker.template.TemplateExceptionHandler; |
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import org.apache.commons.io.IOUtils; |
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import org.slf4j.LoggerFactory; |
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import org.w3c.dom.Document; |
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import org.xhtmlrenderer.swing.Java2DRenderer; |
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import javax.imageio.ImageIO; |
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import javax.servlet.http.HttpServletResponse; |
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import javax.xml.parsers.DocumentBuilder; |
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import javax.xml.parsers.DocumentBuilderFactory; |
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import java.awt.image.BufferedImage; |
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import java.io.ByteArrayInputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.StringWriter; |
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import java.net.HttpURLConnection; |
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import java.net.URL; |
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import java.util.Map; |
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import java.util.logging.Logger; |
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public class TemplateUtil { |
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/** |
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* 通过远程URL地址获取模板 |
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* 此方法可以通过URL加载存储在远程服务器上的模板 |
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* |
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* @param template |
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* @param map |
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* @param url |
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* @return |
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* @throws Exception |
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*/ |
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public static String getTemplateByUrl(String template, Map<String, Object> map, String url) throws Exception { |
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Configuration cfg = new Configuration(Configuration.VERSION_2_3_30); |
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ByteArrayTemplateLoader byteArrayTemplateLoader = new ByteArrayTemplateLoader(); |
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InputStream initialStream = getInputStreamByGet(url); |
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byteArrayTemplateLoader.putTemplate(template, IOUtils.toByteArray(initialStream)); |
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cfg.setTemplateLoader(byteArrayTemplateLoader); |
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cfg.setDefaultEncoding("UTF-8"); |
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cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER); |
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cfg.setLogTemplateExceptions(false); |
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cfg.setClassicCompatible(true); |
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Template temp = cfg.getTemplate(template); |
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StringWriter stringWriter = new StringWriter(); |
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temp.process(map, stringWriter); |
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stringWriter.flush(); |
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stringWriter.close(); |
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String result = stringWriter.getBuffer().toString(); |
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return result; |
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} |
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/** |
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* 通过get请求得到读取器响应数据的数据流 |
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* |
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* @param url |
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* @return |
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* @throws Exception |
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*/ |
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public static InputStream getInputStreamByGet(String url) throws Exception { |
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InputStream inputStream = null; |
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HttpURLConnection conn = (HttpURLConnection) new URL(url) |
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.openConnection(); |
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conn.setReadTimeout(5000); |
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conn.setConnectTimeout(5000); |
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conn.setConnectTimeout(5000); |
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if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) { |
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inputStream = conn.getInputStream(); |
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} |
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return inputStream; |
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} |
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/** |
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* ftl模板生成图片 |
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* @param template |
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* @param map |
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* @param url |
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* @throws Exception |
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*/ |
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public static BufferedImage turnImage(String template, Map<String,Object> map, String url,Integer width,Integer height) { |
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//方式一：指定模板文件路径加载模板
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// String html = getTemplateByTemplatePath(template, map);
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//方式二：指定类加载器加载模板
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// String html = getTemplateByClassLoader(template, map);
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//方式三：指定远程模板文件存储路径加载模板
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String html = null; |
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BufferedImage img =null; |
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try { |
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html = getTemplateByUrl(template, map,url); |
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byte[] bytes=html.getBytes(); |
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ByteArrayInputStream bin=new ByteArrayInputStream(bytes); |
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DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); |
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DocumentBuilder builder=factory.newDocumentBuilder(); |
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Document document=builder.parse(bin); |
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Java2DRenderer renderer = new Java2DRenderer(document,width,height); |
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img = renderer.getImage(); |
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} catch (Exception e) { |
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e.printStackTrace(); |
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} |
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return img; |
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} |
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/** |
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* 待合并的两张图必须满足这样的前提，如果水平方向合并，则高度必须相等；如果是垂直方向合并，宽度必须相等。 |
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* mergeImage方法不做判断，自己判断。 |
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* |
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* @param img1 |
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* 待合并的第一张图 |
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* @param img2 |
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* 带合并的第二张图 |
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* @param isHorizontal |
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* 为true时表示水平方向合并，为false时表示垂直方向合并 |
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* @return 返回合并后的BufferedImage对象 |
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* @throws IOException |
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*/ |
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public static BufferedImage mergeImage(BufferedImage img1, |
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BufferedImage img2, boolean isHorizontal) throws IOException { |
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int w1 = img1.getWidth(); |
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int h1 = img1.getHeight(); |
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int w2 = img2.getWidth(); |
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int h2 = img2.getHeight(); |
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// 从图片中读取RGB
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int[] ImageArrayOne = new int[w1 * h1]; |
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ImageArrayOne = img1.getRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 逐行扫描图像中各个像素的RGB到数组中
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int[] ImageArrayTwo = new int[w2 * h2]; |
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ImageArrayTwo = img2.getRGB(0, 0, w2, h2, ImageArrayTwo, 0, w2); |
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// 生成新图片
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BufferedImage DestImage = null; |
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if (isHorizontal) { // 水平方向合并
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DestImage = new BufferedImage(w1+w2, h1, BufferedImage.TYPE_INT_RGB); |
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DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
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DestImage.setRGB(w1, 0, w2, h2, ImageArrayTwo, 0, w2); |
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} else { // 垂直方向合并
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DestImage = new BufferedImage(w1, h1 + h2, BufferedImage.TYPE_INT_RGB); |
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DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
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DestImage.setRGB(0, h1, w2, h2, ImageArrayTwo, 0, w2); // 设置下半部分的RGB
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} |
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return DestImage; |
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} |
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} |
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