package com.lxzn.framework.utils;
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import net.lingala.zip4j.core.ZipFile;
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import net.lingala.zip4j.io.ZipInputStream;
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import net.lingala.zip4j.model.FileHeader;
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import java.io.File;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* @Description:
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* @Author: zhangherong
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* @Date: Created in 2021/1/29 15:24
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* @Version: 1.0
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* @Modified By:
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*/
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public class ZipUtil {
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/**
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* 读取压缩文件下的所有文件的文件流
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* @param file
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* @return
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* @throws Exception
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*/
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public static Map<String, ZipInputStream> readZipFileStream(File file) throws Exception {
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ZipFile zipFile = new ZipFile(file);
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zipFile.setFileNameCharset(getEncoding(file));
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if(!zipFile.isValidZipFile())
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return null;
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List<FileHeader> list = zipFile.getFileHeaders();
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if(list == null || list.isEmpty())
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return null;
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Map<String, ZipInputStream> map = new HashMap<>();
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for(FileHeader fileHeader : list) {
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if(!fileHeader.isDirectory()) {
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ZipInputStream zis = zipFile.getInputStream(fileHeader);
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String fileName = fileHeader.getFileName();
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int index = fileName.lastIndexOf("/");
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if(index == -1) {
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index = fileName.lastIndexOf("\\\\");
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if(index == -1) {
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index = fileName.lastIndexOf("\\");
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}
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}
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if(index != -1) {
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fileName = fileName.substring(index + 1);
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}
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map.put(fileName, zis);
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}
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}
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return map;
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}
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/**
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* 判断该使用哪种编码方式解压
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* @param path
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* @return
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* @throws Exception
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*/
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private static String getEncoding(File path) throws Exception {
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String encoding = "GBK";
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ZipFile zipFile = new ZipFile(path);
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zipFile.setFileNameCharset(encoding);
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List<FileHeader> list = zipFile.getFileHeaders();
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for (int i = 0; i < list.size(); i++) {
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FileHeader fileHeader = list.get(i);
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String fileName = fileHeader.getFileName();
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if (isMessyCode(fileName)) {
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encoding = "UTF-8";
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break;
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}
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}
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return encoding;
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}
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private static boolean isMessyCode(String str) {
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for (int i = 0; i < str.length(); i++) {
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char c = str.charAt(i);
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// 当从Unicode编码向某个字符集转换时，如果在该字符集中没有对应的编码，则得到0x3f（即问号字符?）
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// 从其他字符集向Unicode编码转换时，如果这个二进制数在该字符集中没有标识任何的字符，则得到的结果是0xfffd
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if ((int) c == 0xfffd) {
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// 存在乱码
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return true;
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}
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}
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return false;
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}
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public static void main(String[] args) throws Exception {
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String f = "D://中国.zip";
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File file = new File(f);
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Map<String, ZipInputStream> map = readZipFileStream(file);
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if(map != null && !map.isEmpty()){
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System.out.println(map.size());
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for(Map.Entry<String, ZipInputStream> entry : map.entrySet()) {
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System.out.println(entry.getKey());
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//entry.getValue().close();
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}
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}
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}
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}
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