javac 編譯java源文件時(shí)，提示 package does not exist 的錯(cuò)誤

Test.java

import java.security.MessageDigest; import org.apache.commons.codec.binary.Hex;public class Test{public static void main(String args[]){boolean isAlarmed = true;boolean aa = isAlarmed || false;String queryTimestamp = "1970-01-01T00:00:00+0000";System.out.println(queryTimestamp.getBytes());try{MessageDigest md5 = MessageDigest.getInstance("MD5");System.out.println(md5.digest("stringtodigest".getBytes()));byte[] value = "stringtodigest".getBytes();md5.update(value);byte[] digest = md5.digest();System.out.println(new String(Hex.encodeHex(digest)));System.out.println(md5.digest("stringtodigest".getBytes())); System.out.println(md5.digest("stringtodigest".getBytes()));}catch(Exception e){ } } }

　　javac Test.java編譯的時(shí)候報(bào)錯(cuò)！

解決辦法：

　　1. 到mvn repository(http://mvnrepository.com/artifact/commons-codec/commons-codec/1.7)上面吧缺少的 jar 包下載下來，

　　2. 然后給 CLASSPATH 環(huán)境變量在添加一下這個(gè)jar 包所在的路徑，就可以了。

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參考：https://www.linuxquestions.org/questions/programming-9/javac-compiling-error-mising-package-669775/

javac compiling error ( mising package)

First i have to say I am very new to java. I downloaded java codes from the Internet and try to compile them using javac. I got following error,
Code:

　　

C:\temp\javacrypt>"C:\Program Files\Java\jdk1.6.0_06\bin\javac" RSAExample.java .\BaseCrypto.java:1: package org.apache.commons.codec does not exist import org.apache.commons.codec.DecoderException;^ .\BaseCrypto.java:2: package org.apache.commons.codec.binary does not exist import org.apache.commons.codec.binary.Hex;^ .\BaseCrypto.java:26: cannot find symbol symbol : class DecoderException location: class BaseCryptopublic static byte[] asByte(String hexString) throws DecoderException {^ .\BaseCrypto.java:16: cannot find symbol symbol : variable Hex location: class BaseCryptoreturn new String(Hex.encodeHex(buf));^ .\BaseCrypto.java:27: cannot find symbol symbol : variable Hex location: class BaseCryptoreturn Hex.decodeHex(hexString.toCharArray());^ 5 errors

　　I guess i just missed some packages like "org.apache.commons.codec.*",
　　and that package is not part of standard jdk, right?

　　How do i get those package? I also have netbean and eclipse, but I haven't tried to use them yet.

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When you get the package, which is probably a .jar file, add that .jar file to your classpath (environment variable).

EDIT:?Specifically, here.

EDIT: I believe on Windows it's something like...

SET CLASSPATH=%CLASSPATH%;C:\path\to\jar\jarfile.jar

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I downloaded the jar file suggested by elprawn, and it work great!! thank you so much.
I am curious about the suggestion from jay73. Is the package management the software like "yum" or "apt-get", right? What keyword should use to search for it?

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On a system that uses apt, you can use?
aptitude search commons
and you'should get a list of the available commons?libraries.On?ubuntu:

jurgen@Selena:~$ aptitude search commons i libcommons-attributes-java - adds C#/.Net-style attributes to Java code i A libcommons-beanutils-java - utility for manipulating JavaBeans i libcommons-beanutils-java-doc - Javadoc API for libcommons-beanutils-java i A libcommons-cli-java - API for working with the command line argu i A libcommons-codec-java - encoder and decoders such as Base64 and he i A libcommons-collections-java - A set of abstract data type interfaces and i A libcommons-collections3-java - A set of abstract data type interfaces and i libcommons-collections3-java-do - Documentation for libcommons-collections3- i libcommons-configuration-java - Java based library providing a generic con p libcommons-csv-java - a Java library for working with csv (comma p libcommons-csv-java-doc - documentation for libcommons-csv-java i A libcommons-daemon-java - library to launch Java applications as dae i A libcommons-dbcp-java - Database Connection Pooling Services i A libcommons-digester-java - Rule based XML Java object mapping tool p libcommons-discovery-java - locates classes that implement a given Jav i A libcommons-el-java - Implementation of the JSP2.0 Expression La i libcommons-fileupload-java - File upload capability to your servlets an i libcommons-httpclient-java - A Java(TM) library for creating HTTP clien i libcommons-httpclient-java-doc - Documentation for libcommons-httpclient-ja i libcommons-io-java - Common useful IO related classes i libcommons-io-java-doc - Common useful IO related classes - documen p libcommons-jexl-java - expression language engine p libcommons-jxpath-java - manipulate javabean using XPath syntax p libcommons-jxpath-java-doc - Javadoc API for libcommons-jxpath-java i A libcommons-lang-java - Extension of the java.lang package i A libcommons-launcher-java - cross platform java application launcher i A libcommons-logging-java - commmon wrapper interface for several logg i A libcommons-modeler-java - convenience library to use Java Management i libcommons-modeler-java-doc - documentation and examples for Commons Mod i libcommons-net-java - internet protocol suite Java library p libcommons-openpgp-java - a common and simple interface for generati p libcommons-openpgp-java-doc - a common and simple interface for generati i A libcommons-pool-java - pooling implementation for Java objects i libcommons-validator-java - ease and speed development and maintenance p libgettext-commons-java - Java classes for internationalization (i18 p libhibernate-commons-annotation - Hibernate Commons Annotations p libws-commons-util-java - Common utilities from the Apache Web Servi p libxml-commons-resolver1.1-java - XML entity and URI resolver library p libxml-commons-resolver1.1-java - XML entity and URI resolver library -- doc p libxml-commons-resolver1.1-java - XML entity and URI resolver library -- nat i libxmlgraphics-commons-java - reusable components used by Batik and FOP

　　

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轉(zhuǎn)載于:https://www.cnblogs.com/oxspirt/p/7443485.html

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