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