我使用BIRT创建了一个报告,一些动态字段是来自后端系统的HTML值,但是当我尝试使用HTML嵌入图像生成PDF报告时 - 它显示:"此报告的资源项目无法访问。"而不是图像。
有没有解决方案在PDF中渲染嵌入图像?它在HTML中运行良好。
答案 0 :(得分:1)
我找到了一个解决方案,如何以PDF格式呈现图像,这些图像嵌入在HTML内容中。问题出在BIRT库ResourceLocatorWrapper类上。我改变了方法:
public byte [] findResource(ModuleHandle设计,String fileName,int fileType,Map appContext);
现在它成功地以PDF格式显示嵌入图像和其他HTML内容。不需要在BIRT jar库中添加它,你可以像我一样在org.eclipse.birt.report.engine.util包中的项目中添加这个类,它应该可以正常工作。
package org.eclipse.birt.report.engine.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.eclipse.birt.report.engine.i18n.MessageConstants;
import org.eclipse.birt.report.model.api.ModuleHandle;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.pdf.codec.Base64;
public class ResourceLocatorWrapper {
private HashMap<URL, byte[]> cache;
private static final byte[] DUMMY_BYTES = new byte[0];
private static final String RESOURCE_BUNDLE = "org.eclipse.birt.report.engine.i18n.Messages";
protected static Logger logger = Logger.getLogger(ResourceLocatorWrapper.class.getName(), RESOURCE_BUNDLE);
public ResourceLocatorWrapper() {
cache = new HashMap<URL, byte[]>();
}
public void dispose() {
synchronized (cache) {
cache.clear();
cache = null;
}
}
/**
*
* @param fileName
* @param fileType
* @param appContext
* @return
*/
public byte[] findResource(ModuleHandle design, String fileName, int fileType, Map appContext) {
if (fileName.startsWith("data:")) {
final String base64Data = fileName.substring(fileName.indexOf(",") + 1);
try {
return Base64.decode(base64Data);
} catch (Exception e) {
throw new ExceptionConverter(e);
}
} else {
URL url = design.findResource(fileName, fileType, appContext);
if (url == null) {
logger.log(Level.WARNING, MessageConstants.RESOURCE_NOT_ACCESSIBLE, fileName);
return DUMMY_BYTES;
}
return findResource(url);
}
}
/**
* Finds a resource from the given URL. If the URL is not accessible, it
* will return a 0-size byte array.
*/
public byte[] findResource(URL url) {
System.out.println("findResource(URL url)");
if (url == null) {
return DUMMY_BYTES;
}
synchronized (cache) {
if (cache == null) {
return DUMMY_BYTES;
}
byte[] inBytes = cache.get(url);
if (inBytes == null) {
try {
InputStream in = url.openStream();
inBytes = getByteArrayFromInputStream(in);
in.close();
cache.put(url, inBytes);
} catch (IOException e) {
logger.log(Level.WARNING, MessageConstants.RESOURCE_NOT_ACCESSIBLE, url.toExternalForm());
cache.put(url, DUMMY_BYTES);
return DUMMY_BYTES;
}
}
return inBytes;
}
}
private byte[] getByteArrayFromInputStream(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int size = in.read(buffer);
while (size != -1) {
out.write(buffer, 0, size);
size = in.read(buffer);
}
buffer = out.toByteArray();
out.close();
return buffer;
}
}
答案 1 :(得分:0)
只需将这一行放在动态图片的onCreate
元素中
importPackage(Packages.javax.imageio);
importPackage(Packages.java.io);
importPackage(Packages.sun.misc);
decoder = new BASE64Decoder();
decodedBytes = decoder.decodeBuffer(this.getRowData().getColumnValue("YOUR_DATA_BS64"));
this.data =decodedBytes;
bais = new ByteArrayInputStream( decodedBytes);
bufimg = ImageIO.read(bais);
this.setHeight(bufimg.getHeight() +"px");
this.setWidth(bufimg.getWidth() +"px");