解析zip文件-不生成临时文件的办法-优快云博客

本文链接：https://blog.youkuaiyun.com/wenpp/article/details/84293008

本文介绍了一种使用Java程序来解压特定ZIP文件的方法，并将解压后的每个文件保存到指定目录。程序通过读取ZIP文件中的所有条目，然后逐个提取并写入到新的文件中。

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package com.test;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;


public class ReadData {
	 public static void main(String args[])throws Exception{  
		         File f = new File("/home/upload/TwitterBig.zip");  
		         InputStream in = new FileInputStream(f);  
		         byte bytes[]=new byte[(int)f.length()];     //创建合适文件大小的数组  
		         in.read(bytes);    //读取文件中的内容到b[]数组  
		         in.close();  

		         ByteArrayInputStream fis = new ByteArrayInputStream(bytes); 
		         ZipInputStream zis = new ZipInputStream(fis);

			     ZipEntry ze = null;

			     while((ze = zis.getNextEntry()) != null){
			        	String name = ze.getName();
			        	System.out.println("File name****"+ze.getName());	

						long size = ze.getSize();

						byte[] binary = readZipEntry(zis,size);
			        	writeFile(binary,"/home/upload/parese/"+ze.getName());			        	
			     }


	 }  

		private static byte[] readZipEntry(ZipInputStream zipIn, long size)
				throws Exception {
			ByteArrayOutputStream output = new ByteArrayOutputStream();
			int oneByte = -1;
			long offset = 0L;			

			try {								
				while ((oneByte = zipIn.read()) > -1) {
					output.write((byte) oneByte);
					offset++;
					if (offset == size) {
						break;
					}
				}
			} finally {
				output.close();
			}
			return output.toByteArray();
		}

		private static void writeFile(byte[] content, String filename) throws IOException {

			File file = new File(filename);

			if (!file.exists()) {
				file.createNewFile();
			}

			FileOutputStream fop = new FileOutputStream(file);
			BufferedOutputStream buff = new BufferedOutputStream(fop);		

			buff.write(content);
			buff.flush();
			buff.close(); 
		}
}