文件下载工具类-FileDownloadUtil
作者：互联网
==============================================文件下载工具类
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FileDownloadUtil {
private static final Logger logger = LoggerFactory.getLogger(FileDownloadUtil.class);
/**
* 普通文件下载（流的方式）
* @param targetFile 预下载的文件路径(服务器路径)
* @param response
*/
public static void downloadLocal(String targetFile, HttpServletResponse response) {
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try{
logger.info("【普通文件下载】开始下载文件, targetFile={}", targetFile);
//设置文件下载时，文件流的格式
bis = new BufferedInputStream(new FileInputStream(targetFile));
bos = new BufferedOutputStream(response.getOutputStream());
//下面这个变量保存的是要下载的文件拼接之后的完整路径
String downName = FilePathUtil.extractFileName(targetFile);
response.reset();//先清空response 非常重要
response.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(downName,"utf-8"));
byte[] buff = new byte[2048];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
logger.info("【普通文件下载】结束下载文件, 下载后的文件filename={}", downName);
}catch(Exception e){
e.printStackTrace();
}finally {
try {
bis.close();
bos.close();
}catch (Exception e){
e.printStackTrace();;
}
}
}
/**
* 普通文件下载（支持在线打开）
* @param targetFile 预下载的文件路径(服务器路径)
* @param response
*/
public static void downloadLocal(String targetFile, HttpServletResponse response, boolean isOnline) {
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try{
logger.info("【普通文件下载】开始下载文件, targetFile={}", targetFile);
//设置文件下载时，文件流的格式
bis = new BufferedInputStream(new FileInputStream(targetFile));
bos = new BufferedOutputStream(response.getOutputStream());
//下面这个变量保存的是要下载的文件拼接之后的完整路径
String downName = FilePathUtil.extractFileName(targetFile);
response.reset();//先清空response 非常重要
if(isOnline) {
URL url = new URL("file:///" + targetFile);
response.setContentType(url.openConnection().getContentType());
response.setHeader("Content-Disposition", "inline; filename=" + URLEncoder.encode(downName,"utf-8"));
}else {
response.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(downName,"utf-8"));
}
byte[] buff = new byte[2048];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
logger.info("【普通文件下载】结束下载文件, 下载后的文件filename={}", downName);
}catch(Exception e){
e.printStackTrace();
}finally {
try {
bis.close();
bos.close();
}catch (Exception e){
e.printStackTrace();;
}
}
}
/**
* 网络文件下载到服务器
* @param urlFile 网络文件路径 reg windine.blogdriver.com/logo.gif
* @param targetFile 服务器文件路径 E:/home/img/img.zip
* @param response
*/
public static void downloadUrl(String urlFile, String targetFile, HttpServletResponse response) {
ReadableByteChannel rbc = null;
FileOutputStream fos = null;
try{
logger.info("【网络文件下载】开始下载文件, urlFile={} targetFile={}", urlFile, targetFile);
URL website = new URL(urlFile);
rbc = Channels.newChannel(website.openStream());
fos = new FileOutputStream(targetFile);
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
logger.info("【普通文件下载】结束下载文件, 下载后的文件targetFile={}", targetFile);
}catch(Exception e){
e.printStackTrace();
}finally {
try {
rbc.close();
fos.close();
}catch (Exception e){
e.printStackTrace();;
}
}
}
}
==============================================文件下载工具测试类
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.taoxw.plugins.file.FileDownloadUtil;
@RequestMapping("/taoxw/file")
@Controller
public class FileController {
/**
* 网络资源下载
* @param request
* @param response
*/
@RequestMapping(value = "downloadFile03", method = RequestMethod.GET)
@ResponseBody
public void downloadUrl(HttpServletRequest request, HttpServletResponse response) {
String urlFile = "https://i1.hdslb.com/bfs/face/08b322c8ac249d26319557af4955a56ac6a4b397.jpg@140w_140h_1c.webp";
String targetFile = "E:\\home\\commUtils\\temp\\140w_140h_1c.webp";
FileDownloadUtil.downloadUrl(urlFile, targetFile, response);
}
/**
* 普通下载（支持在线打开）
* @param request
* @param response
*/
@RequestMapping(value = "downloadFile02", method = RequestMethod.GET)
@ResponseBody
public void downloadFile(HttpServletRequest request, HttpServletResponse response) {
String targetFile = "E:\\home\\commUtils\\temp\\Person03.txt";
FileDownloadUtil.downloadLocal(targetFile, response, true);
}
/**
* 普通下载
* @param request
* @param response
*/
@RequestMapping(value = "downloadFile01", method = RequestMethod.GET)
@ResponseBody
public void downloadFile(HttpServletResponse response) {
String targetFile = "E:\\home\\commUtils\\temp\\Person03.txt";
FileDownloadUtil.downloadLocal(targetFile, response);
}
}
通过浏览器GET请求方式下载
http://127.0.0.1:8090/taoxw/file/downloadFile01 ---下载服务器文件到本地
http://127.0.0.1:8090/taoxw/file/downloadFile02 ---下载服务器文件到本地，且支持在线打开
http://127.0.0.1:8090/taoxw/file/downloadFile02 ---下载网络资源文件到服务器，资源文件后缀保持一致，否则打不开
标签：下载工具,文件,param,targetFile,FileDownloadUtil,import,response,下载 来源： https://www.cnblogs.com/taoxw/p/15929260.html