FileUtils.java
package com.cmbchina.ccd.itpm.project.util;
import org.slf4j.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import static org.slf4j.LoggerFactory.getLogger;
/**
* @ClassName FileUtils
* @Description 文件下载
* @Author Sue
* @Create 2020/4/16 9:00
**/
public class FileUtils {
private static final Logger logger = getLogger(FileUtils.class);
public static void download(HttpServletResponse response, String filePath, String encode) {
response.setContentType("text/html;charset=" + encode);
String downLoadPath = filePath;
File file = new File(downLoadPath);
try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream(downLoadPath)); BufferedOutputStream bos = new BufferedOutputStream(
response.getOutputStream())) {
long fileLength = file.length();
String fileName = file.getName();
response.setContentType("application/x-msdownload;");
response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes(encode), StandardCharsets.UTF_8));
response.setHeader("Content-Length", String.valueOf(fileLength));
byte[] buff = new byte[2048];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
} catch (Exception e) {
logger.error(e.getMessage());
}
}
/**
* 以流的方式下载
*
* @param path
* @param response
* @return
*/
public HttpServletResponse download(String path, HttpServletResponse response) {
try {
// path是指欲下载的文件的路径。
File file = new File(path);
// 取得文件名。
String filename = file.getName();
// 取得文件的后缀名。
String ext = filename.substring(".".lastIndexOf(filename) + 1).toUpperCase();
// 以流的形式下载文件。
byte[] buffer;
try (InputStream fis = new BufferedInputStream(new FileInputStream(path))) {
buffer = new byte[fis.available()];
fis.read(buffer);
}
// 清空response
response.reset();
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (IOException ex) {
logger.error("{}", ex);
}
return response;
}
/**
* 下载本地文件
*
* @param response
* @throws FileNotFoundException
*/
public void downloadLocal(HttpServletResponse response) throws IOException {
// 下载本地文件
// 文件的默认保存名
String fileName = "Operator.doc";
// 读到流中
// 文件的存放路径
try (InputStream inStream = new FileInputStream("c:/Operator.doc")) {
// 设置输出的格式
response.reset();
response.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
// 循环取出流中的数据
byte[] b = new byte[100];
int len;
try {
while ((len = inStream.read(b)) > 0) {
response.getOutputStream().write(b, 0, len);
}
} catch (IOException e) {
logger.error("{}", e);
}
}
}
/**
* 下载网络文件
*
* @throws IOException
*/
public void downloadNet() throws IOException {
// 下载网络文件
int bytesum = 0;
int byteread;
URL url = new URL("windine.blogdriver.com/logo.gif");
URLConnection conn = url.openConnection();
try (InputStream inStream = conn.getInputStream(); FileOutputStream fs = new FileOutputStream("c:/abc.gif")) {
byte[] buffer = new byte[1204];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread;
fs.write(buffer, 0, byteread);
}
}
}
public void downLoadIsOnLine(String fileName, HttpServletRequest request, HttpServletResponse response, boolean isOnLine) throws IOException {
String absolutePath = fileName;
File f = new File(absolutePath);
if (!f.exists()) {
response.sendError(404, "File not found!");
return;
}
//解决中文乱码
String userAgent = request.getHeader("user-agent").toLowerCase();
fileName = f.getName();
String downloadFileName;
if (userAgent.contains("msie") || userAgent.contains("like gecko")) {
downloadFileName = URLEncoder.encode((fileName), "UTF-8");
} else {
downloadFileName = new String((fileName).getBytes(StandardCharsets.UTF_8), "iso-8859-1");
}
byte[] buf = new byte[1024];
int len = 0;
response.reset(); // 非常重要
// 在线打开方式
if (isOnLine) {
URL u = new URL("file:///" + absolutePath);
response.setContentType(u.openConnection().getContentType());
response.setHeader("Content-Disposition", "inline; filename=" + downloadFileName);
// 文件名应该编码成UTF-8
} else { // 纯下载方式
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment; filename=" + downloadFileName);
}
try (BufferedInputStream br = new BufferedInputStream(new FileInputStream(f)); OutputStream out = response.getOutputStream()) {
while ((len = br.read(buf)) > 0) {
out.write(buf, 0, len);
}
}
}
}