Ⅰ 如何解压缩jbig字节数组
是打印机的压缩格式
JBIG (Joint Bi-level Image Experts Group)，是由lossless image compession,的基础上特用于传真机的一种压缩技术。数据压缩的演绎法众多，其中使用于图像压缩的演绎法可粗分为两类，第一类就是lossless image compession,是一种压缩再解压缩后不会产生任何误差的演绎法。第二类则为lossy compression是一种压缩再解压缩后产生误差的演绎法。其中JBIG脱身于第一类lossless image compession，而JPEG（Joint Picture Expert Group）则是由第二类lossy compression发展而来的。这里需要说明的是，MH、MR、MMR、JBIG这几种压缩系统都是针对黑白文稿的压缩系统，而JPEG则是为了适应传真彩色文稿的需求而产生的。运用lossy compression来做图像压缩不但可以获得不错的压缩比，也可以兼顾不错的品质。
Ⅱ 如何使用java从excel表提取内容
以下是使用java从excel表提取内容的程序 -
import java.io.File;import java.io.FileInputStream;import org.apache.tika.metadata.Metadata;import org.apache.tika.parser.ParseContext;import org.apache.tika.parser.microsoft.ooxml.OOXMLParser;import org.apache.tika.sax.BodyContentHandler;public class ExtractContentFromExcel {
public static void main(String args[]) throws Exception {
// detecting the file type
BodyContentHandler handler = new BodyContentHandler();
Metadata metadata = new Metadata();
FileInputStream inputstream = new FileInputStream(new File("excelExample.xlsx"));
ParseContext pcontext = new ParseContext();
// OOXml parser
OOXMLParser msofficeparser = new OOXMLParser();
msofficeparser.parse(inputstream, handler, metadata, pcontext);
System.out.println("Contents of the document:" + handler.toString());
System.out.println("Metadata of the document:");
String[] metadataNames = metadata.names();
for (String name : metadataNames) {
System.out.println(name + ": " + metadata.get(name));
}
}}Java
原ODF文件：excelExample.xlsx 的内容如下 -
执行上面示例代码，得到以下结果 -
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/F:/worksp/javaexamples/libs/tika_libs/tika-app-1.16.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/F:/worksp/javaexamples/libs/tika_libs/tika-server-1.16.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
九月 27, 2017 5:15:47 上午 org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
警告: JBIG2ImageReader not loaded. jbig2 files will be ignored
See http://pdfbox.apache.org/2.0/dependencies.html#jai-image-io
for optional dependencies.
TIFFImageWriter not loaded. tiff files will not be processed
See http://pdfbox.apache.org/2.0/dependencies.html#jai-image-io
for optional dependencies.
J2KImageReader not loaded. JPEG2000 files will not be processed.
See http://pdfbox.apache.org/2.0/dependencies.html#jai-image-io
for optional dependencies.
九月 27, 2017 5:15:47 上午 org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
警告: org.xerial's sqlite-jdbc is not loaded.
Please provide the jar on your classpath to parse sqlite files.
See tika-parsers/pom.xml for the correct version.
Contents of the document:Sheet1
编号 姓名 年龄 工作
1001 王传大 22 Java软件开发
1002 李小双 29 项目经理
1020 张在传 28 人事经理
Sheet2
Sheet3
Metadata of the document:
date: 2017-09-27T09:15:38Z
meta:creation-date: 2017-09-27T09:13:50Z
extended-properties:Application: Microsoft Excel
Creation-Date: 2017-09-27T09:13:50Z
dcterms:created: 2017-09-27T09:13:50Z
Last-Modified: 2017-09-27T09:15:38Z
dcterms:modified: 2017-09-27T09:15:38Z
Last-Save-Date: 2017-09-27T09:15:38Z
protected: false
meta:save-date: 2017-09-27T09:15:38Z
Application-Name: Microsoft Excel
modified: 2017-09-27T09:15:38Z
Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
custom:KSOProctBuildVer: 2052-10.1.0.6489Shell
易百教程移动端：请扫描本页面底部(右侧)二维码并关注微信公众号，回复："教程" 选择相关教程阅读或直接访问：http://m.yii.com 。