Java多文件以ZIP压缩包导出的实现方法

时间:2022-09-07 00:26:34

本文实例为大家分享了java多文件以zip压缩包导出的具体代码,供大家参考,具体内容如下

1、使用java实现吧服务器的图片打包成一个zip格式的压缩包导出,多个文件打包导出。
2、代码如下:

**imagebyteutil.java**

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public class imagebyteutil{
  private static float quality = 0.6f;
  public static void compresszip(list<file> listfiles, outputstream output,string encode, boolean compress,string alias){
  zipoutputstream zipstream = null;
  try {
      zipstream = new zipoutputstream(output);
      for (file file : listfiles){
        compresszip(file, zipstream, compress,alias+"_"+(listfiles.indexof(file)+1));
      }
    } catch (exception e) {
      e.printstacktrace();
    }finally {
      try {
        if (zipstream != null) {
          zipstream.close();
        }
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
  }
 
private static void compresszip(file file, zipoutputstream zipstream,
      boolean compress,string alias) throws exception{
    fileinputstream input = null;
    try {
      input = new fileinputstream(file);
      //zip(input, zipstream, file.getname(), compress);
      zip(input, zipstream, alias+"."+file.getname().substring(file.getname().lastindexof(".")+1), compress);
    } catch (exception e) {
      e.printstacktrace();
    }finally {
      try {
        if(input != null)
          input.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
  }
 
private static void zip(inputstream input, zipoutputstream zipstream,
      string zipentryname, boolean compress) throws exception{
      byte[] bytes = null;
    bufferedinputstream bufferstream = null;
    try {
      if(input == null)
        throw new exception("获取压缩的数据项失败! 数据项名为:" + zipentryname);
      // 压缩条目不是具体独立的文件,而是压缩包文件列表中的列表项,称为条目,就像索引一样
      zipentry zipentry = new zipentry("图片/"+zipentryname);
      // 定位到该压缩条目位置,开始写入文件到压缩包中
      zipstream.putnextentry(zipentry);
      if (compress) {
        bytes = imagebyteutil.compressofquality(input, 0);
        zipstream.write(bytes, 0, bytes.length);
      } else {
        bytes = new byte[1024 * 5];// 读写缓冲区
        bufferstream = new bufferedinputstream(input);// 输入缓冲流
        int read = 0;
        while ((read = bufferstream.read(bytes)) != -1) {
          zipstream.write(bytes, 0, read);
        }
      }
    } catch (ioexception e) {
      e.printstacktrace();
    } finally {
      try {
        if (null != bufferstream)
          bufferstream.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
  }
 
  public static byte[] compressofquality(file file, float quality) throws exception{
    byte[] bs = null;
    inputstream input = null;
    try {
      input = new fileinputstream(file);
      bs = compressofquality(input,quality);
    } catch (exception e) {
      e.printstacktrace();
    } finally {
      try {
        if (input != null)
          input.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
    return bs;
  }
 
  public static byte[] compressofquality(inputstream input, float quality)
      throws exception {
      bytearrayoutputstream output = null;
    try {
      output = new bytearrayoutputstream();
      if(quality == 0){
        thumbnails.of(input).scale(1f).outputquality(quality)
        .tooutputstream(output);
      } else {
        thumbnails.of(input).scale(1f).outputquality(quality).tooutputstream(output);
      }
      return output.tobytearray();
    } catch (exception e) {
      e.printstacktrace();
    } finally {
      try {
        if (output != null)
          output.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
    return null;
  }
}

**main.java**

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public static void main(string[] args){
  //要导出的文件集合,添加自己需要导出的文件
  list<file> listfiles = new arraylist<>();
  //调用工具类,参数说明(需要导出的文件集,bytearrayoutputstream对象,编码,是否压缩【true,false】,文件名称前缀)
  imagebyteutil.compresszip(listfiles, out, "utf-8", false,"lwj");
  //指定导出格式
  returncontext.addparam("exportfilename","extfile.zip");
  returncontext.addparam("mimetype", "zip");
  return in;
}

3、此功能是根据在开发过程中项目需要实现的,测试可正常使用,可更改定制。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:https://blog.csdn.net/lovelongjun/article/details/76104192