package com.matrix.system.hive.plugin.util;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.URLEncoder;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import javax.servlet.http.HttpServletResponse;
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public class FileDownload {
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/**
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* @param response
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* @param filePath
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* //文件完整路径(包括文件名和扩展名)
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* @param fileName
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* //下载后看到的文件名
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* @return 文件名
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*/
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public static void fileDownload(final HttpServletResponse response, String filePath, String fileName) throws Exception {
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byte[] data = toByteArray2(filePath);
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fileName = URLEncoder.encode(fileName, "UTF-8");
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response.reset();
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response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
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response.addHeader("Content-Length", "" + data.length);
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response.setContentType("application/octet-stream;charset=UTF-8");
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OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
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outputStream.write(data);
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outputStream.flush();
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outputStream.close();
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response.flushBuffer();
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}
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/**
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* 读取到字节数组2
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*
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* @param filePath
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* @return
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* @throws IOException
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*/
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public static byte[] toByteArray2(String filePath) throws IOException {
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File f = new File(filePath);
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if (!f.exists()) {
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throw new FileNotFoundException(filePath);
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}
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FileChannel channel = null;
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FileInputStream fs = null;
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try {
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fs = new FileInputStream(f);
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channel = fs.getChannel();
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ByteBuffer byteBuffer = ByteBuffer.allocate((int) channel.size());
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while ((channel.read(byteBuffer)) > 0) {
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}
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return byteBuffer.array();
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} catch (IOException e) {
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e.printStackTrace();
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throw e;
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} finally {
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try {
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channel.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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try {
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fs.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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public static String getClasspath() {
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String path = (String.valueOf(Thread.currentThread().getContextClassLoader())).replaceAll("file:/", "").replaceAll("%20", " ").trim();
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if (path.indexOf(":") != 1) {
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path = File.separator + path;
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}
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return path;
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}
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}
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