Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.apache.syncope.installer.utilities; import com.izforge.izpack.panels.process.AbstractUIProcessHandler; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.nio.charset.Charset; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.apache.commons.io.FileUtils; import org.w3c.dom.Document; public class FileSystemUtils { private final AbstractUIProcessHandler handler; public FileSystemUtils(final AbstractUIProcessHandler handler) { this.handler = handler; } public void createDirectory(final String directoryPath) { final File directory = new File(directoryPath); if (!directory.exists()) { directory.mkdirs(); } } public void copyFile(final String sourceFilePath, final String targetFilePath) { try { FileUtils.copyFile(new File(sourceFilePath), new File(targetFilePath)); } catch (final IOException ex) { final String errorMessage = "Error copying file " + sourceFilePath + " to " + targetFilePath + ": " + ex.getMessage(); handler.emitError(errorMessage, errorMessage); InstallLog.getInstance().error(errorMessage); } } public void exec(final String cmd, final String path) { try { handler.logOutput("Executing " + cmd, true); final ProcessBuilder builder = new ProcessBuilder(cmd.split(" ")); if (path != null && !path.isEmpty()) { builder.directory(new File(path)); } final Process process = builder.start(); readResponse(process.getInputStream()); } catch (final IOException ex) { final String errorMessage = "Error executing " + cmd + ": " + ex.getMessage(); handler.emitError(errorMessage, errorMessage); InstallLog.getInstance().error(errorMessage); } } private void readResponse(final InputStream inputStream) throws IOException { final BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String line = reader.readLine(); while (line != null) { line = reader.readLine(); final String content = line == null ? "" : line; handler.logOutput(content, false); InstallLog.getInstance().info(content); } inputStream.close(); } public void writeToFile(final File file, final String content) { try { final FileWriter fw = new FileWriter(file.getAbsoluteFile()); try (BufferedWriter bw = new BufferedWriter(fw)) { bw.write(content); } } catch (final IOException ex) { final String errorMessage = "Error writing file " + file.getAbsolutePath() + ": " + ex.getMessage(); handler.emitError(errorMessage, errorMessage); InstallLog.getInstance().error(errorMessage); } } public String readFile(final File file) { String content = ""; try { content = FileUtils.readFileToString(file, Charset.forName("UTF-8")); } catch (IOException ex) { final String errorMessage = "Error reading file " + file.getAbsolutePath() + ": " + ex.getMessage(); handler.emitError(errorMessage, errorMessage); InstallLog.getInstance().error(errorMessage); } return content; } public void appendToFile(final File file, final String content) { try { if (!file.exists()) { file.createNewFile(); } try (PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(file, true)))) { out.println(content); } } catch (IOException ex) { final String errorMessage = "Error writing file " + file.getAbsolutePath() + ": " + ex.getMessage(); handler.emitError(errorMessage, errorMessage); InstallLog.getInstance().error(errorMessage); } } public static void writeXML(final Document doc, final OutputStream out) throws IOException, TransformerException { final TransformerFactory factory = TransformerFactory.newInstance(); factory.setFeature(javax.xml.XMLConstants.FEATURE_SECURE_PROCESSING, true); final Transformer transformer = factory.newTransformer(); transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no"); transformer.setOutputProperty(OutputKeys.METHOD, "xml"); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4"); transformer.transform(new DOMSource(doc), new StreamResult(new OutputStreamWriter(out, Charset.forName("UTF-8")))); out.close(); } public static void delete(final File file) { FileUtils.deleteQuietly(file); } public void copyFileFromResources(final String filePath, final String destination, final AbstractUIProcessHandler handler) { try { FileUtils.copyURLToFile(getClass().getResource(filePath), new File(destination)); } catch (IOException ex) { String errorMessage = "Error copying file " + filePath + " to + " + destination + ": " + ex.getMessage(); handler.emitError(errorMessage, errorMessage); InstallLog.getInstance().error(errorMessage); } } }