隨筆
1、調用
// 導出歸檔件
// 若是沒有選中則導出全部，選中則按照選中Laura
public void plistDownLoad() throws Exception {
String fileIds = request.getParameter ("fileIds");
// 此處模擬處理ids,拿到文件下載url
List<String> paths = new ArrayList<> ( );
String realPath = request.getSession ( ).getServletContext ( ).getRealPath ("/");// 鎖定工程路徑下（Windows）
String url = realPath + "upload\\pdf2\\";// 統一文件夾地址
if ( DailyUtil.isStringEmpty (fileIds)){// 不為空的逗號隔開字符串，填充
String[] split = fileIds.split (",");
if (DailyUtil.isArray (split)){
for (String pdfName : split) {
String filePath = url + pdfName+ ".pdf";// 組合的最終路徑
paths.add (filePath);
}
}
}else {// 不選中則導出所有（遍歷整個 目錄）
String fNames = DailyFileUtil.folderMethod2 (url);
String[] split = fNames.split (",");
if (DailyUtil.isArray (split)){
for (String pdfName : split) {
String filePath = url + pdfName;// 組合的最終路徑
paths.add (filePath);
}
}
}
// paths.add ("C:\\Users\\E480\\Desktop\\Study\\casul筆記.txt");
// paths.add ("C:\\Users\\E480\\Desktop\\Study\\config配置中心筆記.txt");
// paths.add ("C:\\Users\\E480\\Desktop\\Study\\GateWay.txt");
if (paths.size ( ) != 0) {
// 創建臨時路徑,存放壓縮文件
File dir = new File(url+"\\zip");
if (!dir.exists()) {// 判斷目錄是否存在
dir.mkdir();
}
String zipFilePath = url+"\\zip\\myzip.zip";
// 壓縮輸出流,包裝流,將臨時文件輸出流包裝成壓縮流,將所有文件輸出到這里,打成zip包
ZipOutputStream zipOut = new ZipOutputStream (new FileOutputStream (zipFilePath));
// 循環調用壓縮文件方法,將一個一個需要下載的文件打入壓縮文件包
for (String path : paths) {
// 該方法在下面定義
DailyFileUtil.fileToZip (path, zipOut);
}
// 壓縮完成后,關閉壓縮流
zipOut.close ( );
//拼接下載默認名稱并轉為ISO-8859-1格式
String fileName = new String (("出國出境歸檔壓縮文件.zip").getBytes ( ), "ISO-8859-1");
response.setHeader ("Content-Disposition", "attchment;filename=" + fileName);
//該流不可以手動關閉,手動關閉下載會出問題,下載完成后會自動關閉
ServletOutputStream outputStream = response.getOutputStream ( );
FileInputStream inputStream = new FileInputStream (zipFilePath);
// 如果是SpringBoot框架,在這個路徑
// org.apache.tomcat.util.http.fileupload.IOUtils產品
// 否則需要自主引入apache的 commons-io依賴
// copy方法為文件復制,在這里直接實現了下載效果
IOUtils.copy (inputStream, outputStream);
// 關閉輸入流
inputStream.close ( );
//下載完成之后，刪掉這個zip包
File fileTempZip = new File (zipFilePath);
fileTempZip.delete ( );
}
}
工具方法
package com.jh.jcs.attence.calendar.util;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import javax.servlet.ServletOutputStream;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/*
* @Description: 操作文件的工具集
* @Author: Jk_kang
* @CreateDate: 2021/11/23 15:05
* @Param:
* @Return:
**/
public class DailyFileUtil {
// 遍歷目錄(遞歸
public static String folderMethod2(String path) {
File file = new File (path);
String fileNames = "";
if (file.exists ( )) {
File[] files = file.listFiles ( );
if (null != files) {
for (File file2 : files) {
if (file2.isDirectory ( )) {
System.out.println ("文件夾:" + file2.getAbsolutePath ( ));
folderMethod2 (file2.getAbsolutePath ( ));
} else {
fileNames += file2.getName ( ) + ",";
System.out.println ("文件:" + file2.getAbsolutePath ( ));
}
}
}
} else {
System.out.println ("文件不存在!");
}
return fileNames;
}
public static void fileToZip(String filePath, ZipOutputStream zipOut) throws IOException {
// 需要壓縮的文件
File file = new File (filePath);
// 獲取文件名稱,如果有特殊命名需求,可以將參數列表拓展,傳fileName
String fileName = file.getName ( );
FileInputStream fileInput = new FileInputStream (filePath);
// 緩沖
byte[] bufferArea = new byte[1024 * 10];
BufferedInputStream bufferStream = new BufferedInputStream (fileInput, 1024 * 10);
// 將當前文件作為一個zip實體寫入壓縮流,fileName代表壓縮文件中的文件名稱
zipOut.putNextEntry (new ZipEntry (fileName));
int length = 0;
// 最常規IO操作,不必緊張
while ((length = bufferStream.read (bufferArea, 0, 1024 * 10)) != -1) {
zipOut.write (bufferArea, 0, length);
}
//關閉流
fileInput.close ( );
// 需要注意的是緩沖流必須要關閉流,否則輸出無效
bufferStream.close ( );
// 壓縮流不必關閉,使用完后再關
}
/**
* 文件壓縮
*
* @param srcFile 目錄或者單個文件
* @param zipFile 壓縮后的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 ( );//記得關閉資源
}
}
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;
}
DailyFileUtil.doCompress (file, out, name);
}
}
} else {
DailyFileUtil.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 ( );
}
// 工具api(重載復用)
public static boolean createFileOrDir(String path) {
return createFileOrDir (new File (path));
}
// 沒有文件則創建
private static boolean createFileOrDir(File file) {
if (file.isDirectory ( )) {
return file.mkdirs ( );
}
File parentFile = file.getParentFile ( );
if (!parentFile.exists ( )) {
System.out.println (parentFile.getPath ( ));
boolean mkdirs = parentFile.mkdirs ( );
if (!mkdirs)
return false;
} else {
if (!parentFile.isDirectory ( )) {
boolean delete = parentFile.delete ( );
boolean mkdirs = parentFile.mkdirs ( );
if (!delete || !mkdirs) return false;
}
}
try {
return file.createNewFile ( );
} catch (IOException e) {
e.printStackTrace ( );
}
return false;
}
}
