ClassNotFoundException: WriteException/HSSFAnchor

 使用net.sourceforge.jexcelapi.jxl和org.apache.poi作個測試，pom.xml內容以下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>hui</groupId>
	<artifactId>TestWithMaven</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>TestWithMaven</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

	<dependencies>
		<dependency>
			<groupId>joda-time</groupId>
			<artifactId>joda-time</artifactId>
			<version>2.9.2</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.13</version>
		</dependency>
		<dependency>
			<groupId>org.apache.ibatis</groupId>
			<artifactId>ibatis-core</artifactId>
			<version>3.0</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.0</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.38</version>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
		</dependency>
		<dependency>
			<groupId>org.hamcrest</groupId>
			<artifactId>hamcrest-core</artifactId>
			<version>1.3</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>4.2.2.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>net.sourceforge.jexcelapi</groupId>
			<artifactId>jxl</artifactId>
			<version>2.6.12</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>2.5</version>
		</dependency>

		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>3.14</version>
		</dependency>



	</dependencies>
</project>

1.測試jxl導出excel時，main方法測時正常，可是佈署寫成Servlet形式，佈署到Tomcat 8上就報錯：

ClassNotFoundException: jxl.write.WriteException.

同理：.測試poi導出excel時，main方法測時正常，可是佈署寫成Servlet形式，佈署到Tomcat 8上就報錯：

ClassNotFoundException: org.apache.poi.hssf.usermodel.HSSFAnchor

顯然依賴裏有的，解決方法是：

1）.治標不治本方法（雖也能成功，但後期好比用jersey測試時，啓動時會報ClassNotFoundException: org.glassfish.jersey.servlet.ServletContainer）

將依賴的jar文件jxl-2.6.12.jar、poi-3.14.jar 拷貝到Tomcat的安裝目錄下的lib目錄裏，如：D:\apache-tomcat-8.0.35\lib，而後重啓便可。

2）.  治本方法：

致使這一緣由的方法，是maven依賴會做爲entry，即未自動加入到WEB-INF/lib目錄下，這時咱們須要：

右鍵項目-->Properties-->Deployment Assembly，若是展開  的頁面中沒有Maven dependencies，這時咱們點擊右上角的Add-->Java Build Path Entries-->Maven Dependencies-->finish。

這時maven依賴即自動加入到WEB-INF/lib目錄下，雖然你看不到。而後重啓服務器，即正常。