本文提供打包下载目标url文件为zip解决方案
工具类
package com.solvay.utils.file;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.*;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class UrlFilesToZip {
private static final Logger logger = LoggerFactory.getLogger(UrlFilesToZip.class);
public final static Map<String, String> FILE_TYPE_MAP = new HashMap<String, String>();
public static void filesdown(HttpServletResponse response, List<String> urls,String name){
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ZipOutputStream zos = new ZipOutputStream(bos);
int idx = 1;
for (String oneFile : urls) {
byte[] bytes = getFileFromURL(oneFile);
zos.putNextEntry(new ZipEntry(name + idx+".doc"));
zos.write(bytes, 0, bytes.length);
zos.closeEntry();
idx++;
}
zos.close();
OutputStream os = response.getOutputStream();
os.write(bos.toByteArray());
os.close();
} catch (FileNotFoundException ex) {
logger.error("FileNotFoundException", ex);
} catch (Exception ex) {
logger.error("Exception", ex);
}
}
public static byte[] getFileFromURL(String urlPath) {
byte[] data = null;
InputStream is = null;
HttpURLConnection conn = null;
try {
URL url = new URL(urlPath);
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.setConnectTimeout(6000);
is = conn.getInputStream();
if (conn.getResponseCode() == 200) {
data = readInputStream(is);
} else {
data = null;
}
} catch (MalformedURLException e) {
logger.error("MalformedURLException", e);
} catch (IOException e) {
logger.error("IOException", e);
} finally {
try {
if (is != null) {
is.close();
}
} catch (IOException e) {
logger.error("IOException", e);
}
conn.disconnect();
}
return data;
}
private static byte[] readInputStream(InputStream is) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length = -1;
try {
while ((length = is.read(buffer)) != -1) {
baos.write(buffer, 0, length);
}
baos.flush();
} catch (IOException e) {
logger.error("IOException", e);
}
byte[] data = baos.toByteArray();
try {
is.close();
baos.close();
} catch (IOException e) {
logger.error("IOException", e);
}
return data;
}
private static void getAllFileType()
{
FILE_TYPE_MAP.put("jpg", "FFD8FF");
FILE_TYPE_MAP.put("png", "89504E47");
FILE_TYPE_MAP.put("gif", "47494638");
FILE_TYPE_MAP.put("tif", "49492A00");
FILE_TYPE_MAP.put("bmp", "424D");
FILE_TYPE_MAP.put("dwg", "41433130");
FILE_TYPE_MAP.put("html", "68746D6C3E");
FILE_TYPE_MAP.put("rtf", "7B5C727466");
FILE_TYPE_MAP.put("xml", "3C3F786D6C");
FILE_TYPE_MAP.put("zip", "504B0304");
FILE_TYPE_MAP.put("rar", "52617221");
FILE_TYPE_MAP.put("psd", "38425053");
FILE_TYPE_MAP.put("eml", "44656C69766572792D646174653A");
FILE_TYPE_MAP.put("dbx", "CFAD12FEC5FD746F");
FILE_TYPE_MAP.put("pst", "2142444E");
FILE_TYPE_MAP.put("xls", "D0CF11E0");
FILE_TYPE_MAP.put("docx","504B0304");
FILE_TYPE_MAP.put("doc", "D0CF11E0");
FILE_TYPE_MAP.put("mdb", "5374616E64617264204A");
FILE_TYPE_MAP.put("wpd", "FF575043");
FILE_TYPE_MAP.put("eps", "252150532D41646F6265");
FILE_TYPE_MAP.put("ps", "252150532D41646F6265");
FILE_TYPE_MAP.put("pdf", "255044462D312E");
FILE_TYPE_MAP.put("qdf", "AC9EBD8F");
FILE_TYPE_MAP.put("pwl", "E3828596");
FILE_TYPE_MAP.put("wav", "57415645");
FILE_TYPE_MAP.put("avi", "41564920");
FILE_TYPE_MAP.put("ram", "2E7261FD");
FILE_TYPE_MAP.put("rm", "2E524D46");
FILE_TYPE_MAP.put("mpg", "000001BA");
FILE_TYPE_MAP.put("mov", "6D6F6F76");
FILE_TYPE_MAP.put("asf", "3026B2758E66CF11");
FILE_TYPE_MAP.put("mid", "4D546864");
}
public final static String getFileTypeByStream(byte[] b)
{
String filetypeHex = String.valueOf(getFileHexString(b));
Iterator<Map.Entry<String, String>> entryiterator = FILE_TYPE_MAP.entrySet().iterator();
while (entryiterator.hasNext()) {
Map.Entry<String,String> entry = entryiterator.next();
String fileTypeHexValue = entry.getValue();
if (filetypeHex.toUpperCase().startsWith(fileTypeHexValue)) {
return entry.getKey();
}
}
return null;
}
public final static String getFileHexString(byte[] b)
{
StringBuilder stringBuilder = new StringBuilder();
if (b == null || b.length <= 0)
{
return null;
}
for (int i = 0; i < b.length; i++)
{
int v = b[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2)
{
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
}
使用案例
@GetMapping("/testDownloadZip")
public void testDownloadZip(HttpServletResponse response){
try {
List<String> urls=new ArrayList<>();
String url="http://ip:port/statics/2022/09/29/xxx_20220929102720A024.doc";
urls.add(url);
UrlFilesToZip.filesdown(response,urls,"测试导出zip");
} catch (Exception e) {
e.printStackTrace();
}
}
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