完全写入文件后压缩文件的Java代码

Question

我正在编写一些代码来创建一个 txt 文件，在完全写入该 txt 文件后，完全关闭 txt 文件，然后压缩该文件。但是，我不明白为什么，它不会等到文件关闭后再将其压缩。

这是我的代码:

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;


public class zipfile {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub

        BufferedWriter bfAllBWPownmanmainfest = null;
        String mainfest = "file\\" + "fileforzip" + ".txt";
        bfAllBWPownmanmainfest = new BufferedWriter(new FileWriter(mainfest));
        
        bfAllBWPownmanmainfest.write("jdshsdksdkhdshksd\n");
        bfAllBWPownmanmainfest.write("jdshsdksdkhsdfsdfsddshksd\n");
        bfAllBWPownmanmainfest.write("jdshsdksdsdfdskhdshksd\n");
        bfAllBWPownmanmainfest.write("jdshsdksddsfdskhdshksd\n");
        bfAllBWPownmanmainfest.write("jdshsdksddsfdskhdshksd\n");
        bfAllBWPownmanmainfest.write("jdshsdksdsdfdskhdshksd\n");
        bfAllBWPownmanmainfest.write("jdshsdksddsfsdkhdshksd\n");
        
        bfAllBWPownmanmainfest.flush();
        bfAllBWPownmanmainfest.close();

        //After close file than zip that!! please help me Thanks
        
        FileOutputStream fout = new FileOutputStream("test.zip");
        ZipOutputStream zout = new ZipOutputStream(fout);
        
        ZipEntry ze = new ZipEntry(mainfest);
        zout.putNextEntry(ze);
        zout.closeEntry();
        zout.close();
        
    }

}

关闭 bfAllBWPownmanmainfest.close(); 然后压缩它，我该怎么做。它创建空的 zip 文件，它没有等到文件完全关闭!

Answer 1

您已经创建了一个 ZipEntry，但实际上还没有将任何字节写入输出 zip 文件。您需要从文件的 InputStream 读取并在 putNextEntry(ZipEntry) 之后写入您的 ZipOutputStream。

FileInputStream in = new FileInputStream(mainfest);
byte[] bytes = new byte[1024];
int count;

FileOutputStream fout = new FileOutputStream("test.zip");
ZipOutputStream zout = new ZipOutputStream(fout);

ZipEntry ze = new ZipEntry(mainfest); // this is the name as it will appear if you opened the zip file with WinZip or some other zip manager
zout.putNextEntry(ze);

while ((count = in.read(bytes)) > 0) {
    zout.write(bytes, 0, count);
}

zout.closeEntry();
zout.close();