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io.github.wslxm.springbootplus2.manage.gc.utils.GcFileDownloadUtil Maven / Gradle / Ivy
package io.github.wslxm.springbootplus2.manage.gc.utils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.ResourceUtils;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipOutputStream;
/**
* 文件下载工具类
* @author wangsong
* @mail [email protected]
* @date 2020/8/14 0014 15:14
* @version 1.0.1
*/
@SuppressWarnings("all")
@Slf4j
public class GcFileDownloadUtil {
/**
* 下载指定文件
*
* @param file 下载文件
* @param fileName 下载后的文件名
* @param response
* @return void
* @author wangsong
* @date 2022/8/9 9:15
*/
public static void download(File file, String fileName, HttpServletResponse response) {
// 下载指定文件
try {
//文件流
InputStream in = new BufferedInputStream(new FileInputStream(file));
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
response.setContentType("application/octet-stream");
response.setHeader("content-type", "application/octet-stream");
response.addHeader("Content-Length", file.length() + ""); //文件长度
BufferedOutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
// 放入outputStream流
// byte[] buffer = new byte[in.available()];
byte[] buffer = new byte[1024];
int len = 0;
int i = 0;
// in.read(buffer);
while ((len = in.read(buffer)) != -1) {
i = i + len;
outputStream.write(buffer, 0, len);
}
response.addHeader("Content-Length", i + "");
//最后的内容
outputStream.write(buffer);
//响应返回字节长度-无效:
// response.addHeader("Content-Length", "" + i);// log.error(i);
outputStream.flush();
outputStream.close();
in.close();
} catch (IOException e) {
log.error(e.toString());
}
}
/**
* url可访问的单文件下载
* @author wangsong
* @param response
* @param filePath 可访问的url
* @param fileName 下载的文件名
* @date 2020/8/26 0026 17:00
* @return void
* @version 1.0.1
*/
public static void download(String filePaths, HttpServletResponse response) {
// 获取文件名称
String fileName = filePaths.substring(filePaths.lastIndexOf("/") + 1, filePaths.length());
try {
// 处理文件名编码问题
int index = filePaths.lastIndexOf("/");
String newFilePath = filePaths.substring(0, index + 1);
String newFileName = filePaths.substring(index + 1);
newFilePath = newFilePath + URLEncoder.encode(fileName, "utf-8");
// 下载网络文件
URL url = new URL(newFilePath);
//文件流
URLConnection conn = url.openConnection();
InputStream in = conn.getInputStream();
// 设置response的Header
//response.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes()));
response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
response.setContentType("application/octet-stream");
response.setHeader("content-type", "application/octet-stream");
response.addHeader("Content-Length", conn.getContentLength() + "");//文件长度
BufferedOutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
// 放入outputStream流
//byte[] buffer = new byte[in.available()];
byte[] buffer = new byte[1024];
int len = 0;
int i = 0;
//in.read(buffer);
while ((len = in.read(buffer)) != -1) {
i = i + len;
outputStream.write(buffer, 0, len);
}
response.addHeader("Content-Length", i + "");
//最后的内容
outputStream.write(buffer);
//响应返回字节长度-无效:response.addHeader("Content-Length", "" + i);// log.error(i);
outputStream.flush();
outputStream.close();
in.close();
} catch (IOException e) {
log.error(e.toString());
}
}
/**
* Zip 压缩包（url可访问的文件打包下载）
* @author wangsong
* @param res HttpServletResponse
* @param filePaths 下载路径集, 可访问的url
* @param zipName 压缩包名 + .zip
* @date 2020/8/26 0026 17:01
* @return void
* @version 1.0.1
*/
public static void downloadZip(List filePaths, String zipName, HttpServletResponse res) { //String zipName = zipName; // 压缩包名字
//项目跟目录
try {
File path = new File(ResourceUtils.getURL("classpath:").getPath());
if (!path.exists()) {
path = new File("");
}
//压缩包根目录
File upload = new File(path.getAbsolutePath(), "static/images/uploaZip");
if (!upload.exists()) {
upload.mkdirs();
}
//拼接目录
String zipFilePath = upload + File.separator + zipName + ".zip";
//创建zip文件输出流 == 压缩文件========================================================
File zip = new File(zipFilePath);
if (!zip.exists()) {
zip.createNewFile();
}
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zip));
// 打压缩包
GcFileDownloadUtil.zipFile(filePaths, zos);
zos.close();
// 设置下载的压缩文件名称 --> java.net.URLEncoder.encode(zipName, "UTF-8")
res.setContentType("text/html; charset=UTF-8"); // 设置编码字符
res.setContentType("application/octet-stream"); // 设置内容类型为下载类型
OutputStream out = res.getOutputStream(); // 创建页面返回方式为输出流，会自动弹出下载框 new String(zipName.getBytes("utf-8"),"ISO8859-1")
// res.setHeader("Content-disposition", "attachment;filename=123" + zipName);
res.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(zipName + ".zip", "UTF-8"));
//创建zip文件输出流==========================================================
//将打包后的文件写到客户端，输出的方法同上，使用缓冲流输出
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(zipFilePath));
byte[] buff = new byte[bis.available()];
bis.read(buff);
bis.close();
out.write(buff);//输出数据文件
out.flush();//释放缓存
out.close();//关闭输出流
} catch (IOException e) {
log.error(e.toString());
}
}
/**
* 压缩文件
*
* @param filePaths 需要压缩的文件路径集合
* @throws IOException
*/
private static String zipFile(List filePaths, ZipOutputStream zos) {
//循环读取文件路径集合，获取每一个文件的路径
for (String filePath : filePaths) {
if (filePath == null || filePath == "") {
continue;
}
// 获取文件名前的路径
int index = filePath.lastIndexOf("/");
String newFilePath = filePath.substring(0, index + 1);
String fileName = filePath.substring(index + 1);
// 根据文件路径创建文件, 替换文件名称，先获取后缀名
File inputFile = new File(filePath); //根据文件路径创建文件
// String suffixName = filePath.substring(filePath.lastIndexOf(".") + 1, filePath.length());
// File inputFile = new File(newFilePath + fileName + "1." + suffixName);
try {
newFilePath = newFilePath + URLEncoder.encode(fileName, "utf-8");
URL url = new URL(newFilePath);
InputStream inputStream = url.openStream();
BufferedInputStream bis = new BufferedInputStream(inputStream);
//将文件写入zip内，即将文件进行打包
zos.putNextEntry(new ZipEntry(inputFile.getName()));
//写入文件的方法，同上
int size = 0;
byte[] buffer = new byte[1024]; //设置读取数据缓存大小
while ((size = bis.read(buffer)) > 0) {
zos.write(buffer, 0, size);
}
//关闭输入输出流
zos.closeEntry();
bis.close();
} catch (ZipException | UnsupportedEncodingException | MalformedURLException e) {
if (e.getMessage().indexOf("duplicate entry:") != -1) {
log.error("文件重复：" + filePath);
} else {
log.error("文件下载失败：" + filePath);
log.error(e.toString());
}
} catch (IOException e) {
log.error(e.toString());
}
}
return null;
}
}
