Java

[magicdawn]

Java

[magicdawn]

demos

write apk

http://stackoverflow.com/questions/2223434/appending-files-to-a-zip-file-with-java

• nio FileSystem 比较方便, 无需手动复制

package ml.magicdawn.local;

import java.io.Writer;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.nio.file.*;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by magicdawn on 2017/5/21.
 */
public class ApkPacker {
  public ApkPacker() {
  }

  public  static void main(String[] args) throws Exception {
    String home = System.getenv("HOME");
    String file = home + "/workspace/fengjr/android_pack/in-java.apk";

    Map<String, String> env = new HashMap<>();
    env.put("create", "true");

    Path zipfile = Paths.get(file);
    URI uri = URI.create("jar:file:" + file);

    try(FileSystem fs = FileSystems.newFileSystem(uri, env, null)) {
      Path nf = fs.getPath("META-INF/new.txt");
      try (Writer writer = Files.newBufferedWriter(nf, StandardCharsets.UTF_8, StandardOpenOption.CREATE)) {
        writer.write("hello world" + new Date().toString());
      } catch (Exception e) {
        e.printStackTrace();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

[magicdawn]

Java new features

• https://nanova.me/java-lang-updates/
• https://docs.oracle.com/en/java/javase/20/language/java-language-changes.html