代碼示例
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;
/**
* @program: simple_tools
* @description: Html2PDF
* @author: Mr.chen
* @create: 2020-06-09 09:39
**/
public class CustomWKHtmlToPdfUtil {
/**
* 把html字節數組轉換成pdf的字節數組,非線性安全
*
* @param src
* @return
* @throws IOException
*/
public static byte[] html2Pdf(byte[] src, String wkhtmlToPdfHome) throws IOException {
File srcFile = new File(getTmpFilePath(".html"));
FileUtils.writeByteArrayToFile(srcFile, src);
String targetFilePath = getTmpFilePath(".pdf");
File descFile = new File(targetFilePath);
html2Pdf(srcFile.getAbsolutePath(), descFile.getAbsolutePath(), wkhtmlToPdfHome);
byte[] result = FileUtils.readFileToByteArray(new File(targetFilePath));
srcFile.delete();
descFile.delete();
return result;
}
private static String getTmpFilePath(String suffix) {
String system = System.getProperty("os.name");
if (system.contains("Windows")) {
return "./tmp" + System.currentTimeMillis() + suffix;
} else if (system.contains("Linux")) {
return "/tmp/tmp" + System.currentTimeMillis() + suffix;
} else if (system.contains("Mac OS")) {
return "/tmp/tmp" + System.currentTimeMillis() + suffix;
}
return null;
}
public static String html2Pdf(String sourceFilePath, String targetFilePath, String wkhtmlToPdfHome) {
Process process = null;
String cmd = getCommand(sourceFilePath, targetFilePath, wkhtmlToPdfHome);
try {
process = Runtime.getRuntime().exec(cmd);
// 這個調用比較關鍵,就是等當前命令執行完成後再往下執行
process.waitFor();
// File file = new File(sourceFilePath);
// if (file.exists()) {
// file.delete();
// }
} catch (Exception e) {
e.printStackTrace();
} finally {
if (process != null) {
process.destroy();
}
}
return targetFilePath;
}
public static String getCommand(String sourceFilePath, String targetFilePath, String wkhtmlToPdfHome) {
String system = System.getProperty("os.name");
if (system.contains("Windows")) {
return wkhtmlToPdfHome + "/wkhtmltopdf.exe " + sourceFilePath + " " + targetFilePath;
} else if (system.contains("Linux")) {
return wkhtmlToPdfHome + "/wkhtmltopdf " + sourceFilePath + " " + targetFilePath;
} else if (system.contains("Mac OS")) {
return wkhtmlToPdfHome + "/wkhtmltopdf " + sourceFilePath + " " + targetFilePath;
}
return "";
}
}