preface
You need to put some data into a zip compressed package. You can use ZipOutputStream. ZipOutputStream can write content directly into a zip package. Generally, ZipOutputStream is created by encapsulating a FileOutputStream. Before writing a file, you need to call putNextEntry once, and then use write to write byte [] type data. When writing is complete, use colseEntry to end the packaging of the file. Of course, you can also write data directly into the compressed package through ZipOutputStream to build data in the compressed package.

use
public static void filetest() throws IOException {

    String txtPath = "D:\\fileTest\\image\\2.txt";
    String zipPath = "D:\\fileTest\\image\\2.zip";   //Compressed packet path
    String str = "test test123abc";                   //Data to be written

    //Create a compressed package
    ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipPath));

   //Encapsulate a file
    FileWriter fileWriter = null;
    try {
        fileWriter = new FileWriter(txtPath);
        fileWriter.write(str);
        fileWriter.flush();
        fileWriter.close();
    } catch (IOException e) {
        log.error("fileWriter", e);
    }

    //Build a FileInputStream for the encapsulated files above
    FileInputStream fis = new FileInputStream(txtPath);
    //Create an empty file in the compressed package
    zipOutputStream.putNextEntry(new ZipEntry("Request.json"));
    //Write compressed file
    int len;
    byte[] buffer = new byte[1024]; //Byte array size adjustable
    //Read the fis byte stream and transfer it to the buffer byte array. After reading, fis is empty
    while ((len = fis.read(buffer)) > 0) {
        zipOutputStream.write(buffer, 0, len);
    }
    byte[] b = new byte[1024];
    int a = fis.read(b);
    //Turn off package packaging
    zipOutputStream.closeEntry();
    fis.close();
    zipOutputStream.flush();
    zipOutputStream.close();
}

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After running, the following files will be created:

A request will be generated in the compressed package JSON file, as shown in the figure:

Content and 2 Txt is the same as "test 123abc".

The above method is: first create 2 Txt, read 2 Txt, which is imported into a compressed package to form a file. With the same logic, we can read any other file and put them into a compressed package.

Import content directly into a compressed package
Of course, we can also directly import the data into the compressed package. The implementation is as follows:

public static void filetest() throws IOException {

  String zipPath = "D:\\fileTest\\image\\3.zip";      //Compressed packet path
  String str1 = "test test123abc";                      //Data to be written
  String str2 = "Test 2";
  String Name1 = StringUtils.join("file.json");      //Files in compressed package
  String Name2 = StringUtils.join("file/File 1.json");  //Create files in the file directory in the compressed package
  //Create a compressed package
  ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipPath));
  //Create files in a compressed package
  zipOutputStream.putNextEntry(new ZipEntry(Name1));
  byte[] bytes1 = str1.getBytes(StandardCharsets.UTF_8);
  zipOutputStream.write(bytes1, 0, bytes1.length);    //Write the data to the file in the compressed package
  zipOutputStream.closeEntry();

  zipOutputStream.putNextEntry(new ZipEntry(Name2));
  byte[] bytes2 = str2.getBytes(StandardCharsets.UTF_8);
  zipOutputStream.write(bytes2, 0, bytes2.length);

  zipOutputStream.closeEntry();

  zipOutputStream.flush();
  zipOutputStream.close();

}
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The above is to directly convert String type data into byte array and import it into compressed package to form two files:

File folder is file 1 json, the content inside is "test 2", file The content of json is "test 123abc".

last
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