Java 寫出zip檔的方式如下。
使用ZipOutputStream搭配ZipEntry來輸出zip檔。
package com.abc.demo;
import org.apache.commons.io.FileUtils;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class Main {
public static void main(String[] args) {
List stringList = generateStringList(); // 產生字串
String dir = "D:" + File.separator + "tmp"; // zip的輸出檔案目錄
createDir(dir); // 建立zip輸出目錄資料夾
String zipName = "hello.zip"; // zip檔名稱
String pathName = dir + File.separator + zipName; // D:\tmp\hello.zip
File file = new File(pathName);
writeZip(file, stringList);
}
private static void createDir(String dir) {
try {
FileUtils.forceMkdir(new File(dir)); // 建立目錄
} catch (IOException e) {
e.printStackTrace();
}
}
/** 寫出zip檔。每10行寫在一個txt */
private static void writeZip(File file, List stringList) {
try ( // Java 7 try-with-resources Statement
FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fos);
ZipOutputStream zos = new ZipOutputStream(bos);
) {
StringBuilder sb = new StringBuilder();
int lastLineIndex = 0; // 記錄最後一行10倍行數的index
int txtCount = 0; // 寫出的txt檔計數
for (int i = 0; i < stringList.size(); i++) {
String line = stringList.get(i) + System.lineSeparator();
sb.append(line);
if (isMultipleOf(10, i + 1)) { // 每10行寫到txt檔
ZipEntry entry = new ZipEntry("file" + txtCount++ + ".txt"); // 建立zip檔中的txt檔
zos.putNextEntry(entry);
zos.write(sb.toString().getBytes()); // 將10行文字寫到txt檔
zos.closeEntry();
lastLineIndex = i;
sb = new StringBuilder();
}
}
// 將剩餘的行寫到最後的txt檔
for (int i = lastLineIndex + 1; i < stringList.size(); i++) {
String line = stringList.get(i) + System.lineSeparator();
sb.append(line);
}
ZipEntry entry = new ZipEntry("file" + txtCount + ".txt");
zos.putNextEntry(entry);
zos.write(sb.toString().getBytes());
zos.closeEntry();
} catch (IOException e) {
e.printStackTrace();
}
}
/** i是否為m的倍數 */
private static boolean isMultipleOf(int m, int i) {
return i % m == 0;
}
/** 產生文字內容 */
public static List generateStringList() {
List stringList = new ArrayList<>();
for(int i = 0; i < 103; i++) {
stringList.add("Hello " + i);
}
return stringList;
}
}
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