有时候会有多个附件一起下载的需求，这个时候最好就是打包下载了
首先下面这段代码是正常的单个下载
public void Download(@RequestParam("file_path") String file_path, HttpServletResponse response) {
logger.info("try to download file, the filePath : " + file_path);
int i = file_path.lastIndexOf("/");
String filename = file_path.substring(i+1);
try {
BufferedInputStream in=new BufferedInputStream(ossFileUtil.getFile(file_path));
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
//通知浏览器以附件形式下载
response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(filename,"utf-8"));
byte[] car=new byte[1024];
int L=0;
while((L=in.read(car))!=-1){
out.write(car, 0,L);
}
if(out!=null){
out.flush();
out.close();
}
if(in!=null){
in.close();
}
} catch (IOException e) {
logger.error("the download file error :" + e.getMessage());
throw new ErrorException("200003", errorMsgUtils.errorMsg("","200003"));
}
}
下面代码是打包下载
public void serverDownloads(@RequestParam("file_path") String file_path,
@RequestParam(name = "download_name", required = false) String download_name,
HttpServletResponse response) throws IOException {
logger.info("try to download server file, the filePath : " + file_path);
String[] paths = file_path.split(",\$\$,");
if(paths.length > 1){
// 打包的文件名
String packageName;
if (download_name != null && download_name.trim().length() > 0) {
packageName = download_name + ".zip";
} else {
packageName = "file.zip";
}
//打包下载
response.setContentType("APPLICATION/OCTET-STREAM");
// response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(packageName,"utf-8"));
response.setHeader("Content-Disposition","attachment;filename=" + packageName);
ZipOutputStream out = new ZipOutputStream(response.getOutputStream());
try {
int j = 1;
for(String path : paths){
int i = path.lastIndexOf("/");
String filename = path.substring(i+1);
ZipUtils.doZip(remoteFileUtil.getFile(path), out, filename);
response.flushBuffer();
j++;
}
} catch (IOException e) {
logger.error("the download file error :" + e.getMessage());
throw new ErrorException("200003", errorMsgUtils.errorMsg("","200003"));
}finally{
out.close();
}
}else{
int i = file_path.lastIndexOf("/");
String filename = file_path.substring(i+1);
try {
BufferedInputStream in=new BufferedInputStream(remoteFileUtil.getFile(file_path)); //BufferedInputStream(InputStream in)
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
//通知浏览器以附件形式下载
// response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(filename,"utf-8"));
response.setHeader("Content-Disposition","attachment;filename=" + filename);
byte[] car=new byte[1024];
int L=0;
while((L=in.read(car))!=-1){
out.write(car, 0,L);
}
if(out!=null){
out.flush();
out.close();
}
if(in!=null){
in.close();
}
} catch (IOException e) {
logger.error("the download file error :" + e.getMessage());
throw new ErrorException("200003", errorMsgUtils.errorMsg("","200003"));
}
}
}
最后是ZipUtils类内容
public class ZipUtils {
private ZipUtils(){
}
public static void doCompress(String srcFile, String zipFile) throws IOException {
doCompress(new File(srcFile), new File(zipFile));
}
/**
* 文件压缩
* @param srcFile 目录或者单个文件
* @param zipFile 压缩后的ZIP文件
*/
public static void doCompress(File srcFile, File zipFile) throws IOException {
ZipOutputStream out = null;
try {
out = new ZipOutputStream(new FileOutputStream(zipFile));
doCompress(srcFile, out);
} catch (Exception e) {
throw e;
} finally {
out.close();//记得关闭资源
}
}
public static void doCompress(String filelName, ZipOutputStream out) throws IOException{
doCompress(new File(filelName), out);
}
public static void doCompress(File file, ZipOutputStream out) throws IOException{
doCompress(file, out, "");
}
public static void doCompress(File inFile, ZipOutputStream out, String dir) throws IOException {
if ( inFile.isDirectory() ) {
File[] files = inFile.listFiles();
if (files!=null && files.length>0) {
for (File file : files) {
String name = inFile.getName();
if (!"".equals(dir)) {
name = dir + "/" + name;
}
ZipUtils.doCompress(file, out, name);
}
}
} else {
ZipUtils.doZip(inFile, out, dir);
}
}
public static void doZip(File inFile, ZipOutputStream out, String dir) throws IOException {
String entryName = null;
if (!"".equals(dir)) {
entryName = dir + "/" + inFile.getName();
} else {
entryName = inFile.getName();
}
ZipEntry entry = new ZipEntry(entryName);
out.putNextEntry(entry);
int len = 0 ;
byte[] buffer = new byte[1024];
FileInputStream fis = new FileInputStream(inFile);
while ((len = fis.read(buffer)) > 0) {
out.write(buffer, 0, len);
out.flush();
}
out.closeEntry();
fis.close();
}
//
public static void doZip(InputStream inputStream, ZipOutputStream out, String entryName) throws IOException {
// String entryName = null;
// if (!"".equals(dir)) {
// entryName = dir + "/" + inFile.getName();
// } else {
// entryName = inFile.getName();
// }
ZipEntry entry = new ZipEntry(entryName);
out.putNextEntry(entry);
int len = 0 ;
byte[] buffer = new byte[1024];
// FileInputStream fis = new FileInputStream(inFile);
while ((len = inputStream.read(buffer)) > 0) {
out.write(buffer, 0, len);
out.flush();
}
out.closeEntry();
inputStream.close();
}
public static void main(String[] args) throws IOException {
doCompress("G:/test/", "G:/java.zip");
}
}