mac上jdk1.8换1.7 eclipse tomcat

简介

在本文中，我们将介绍如何在Mac上将JDK 1.8更换为JDK 1.7,并使用Eclipse和Tomcat进行开发，这个过程包括以下几个步骤：安装JDK 1.7,配置Eclipse和Tomcat,以及运行和调试Java Web应用程序。

安装JDK 1.7

1、访问Oracle官网下载JDK 1.7 64位版本的安装包(https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html)。

2、下载完成后，解压安装包到一个合适的目录，/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk。

3、打开终端，输入以下命令设置环境变量：

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

4、将上述命令添加到~/.bash_profile文件中，以便每次打开终端时自动设置环境变量。

5、输入以下命令使环境变量生效：

source ~/.bash_profile

配置Eclipse

1、卸载已安装的JDK 1.8和Eclipse。

2、从Eclipse官网(https://www.eclipse.org/downloads/packages/)下载适用于Mac OS X的Eclipse for Java EE Developers。

3、解压下载的Eclipse安装包到一个合适的目录，/Applications/Eclipse。

4、打开Eclipse,点击菜单栏的Help > Install New Software,然后点击Add按钮。

5、在弹出的对话框中，填写以下信息：

Name: Eclipse Platform SDK

Location: http://download.eclipse.org/releases/galileo/R/x86_64/epp/sdk/R/linux-x86_64/gtk+-2.24.9-20170919-19589dcb/epp-sdk-linux-x86_64-gtk+-2.24.9-20170919-19589dcb-galileo.tar.gz

Group Id: org.eclipse.platformsdk

Version: Galileo Release (4.6a)

Installable Site: http://download.eclipse.org/releases/galileo/R/x86_64/epp/sdk/R/linux-x86_64/installable-site-gtk+-2.24.9-20170919-19589dcb

Checksum: [此处省略]

6、点击OK,然后在下拉列表中选择刚刚添加的Eclipse Platform SDK,点击Next,按照提示完成安装。

配置Tomcat

1、卸载已安装的JDK 1.8和Tomcat。

2、从Apache官网(http://tomcat.apache.org/)下载适用于Mac OS X的Apache Tomcat。

3、将下载的Tomcat压缩包解压到一个合适的目录，/opt/tomcat。

4、将解压后的Tomcat目录复制到${JAVA_HOME}/lib目录下，并重命名为tomcat-server，将${JAVA_HOME}/bin目录下的catalina和catalina.sh文件复制到${JAVA_HOME}/lib/servlet-api.jar所在目录。

5、修改${JAVA_HOME}/lib/servlet-api.jar文件的内容，将其中的内容替换为：

Manifest-Version: 1.0
Premain-Class: org.apache.catalina.startup.Bootstrap

6、在终端中输入以下命令启动Tomcat:

cd ${JAVA_HOME}/lib/servlet-api.jar; jar --update yourappnamehere --replace yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere*yourappnamehere--files--lastModified--version--by--whom--where--when--what--why--how--with what arguments--to what effect--under which conditions--in which order--and with what consequences?" java -server $@ &> "${JAVA_HOME}/logs"/catalina_out & echo "Starting server" && exec catalina run &> "${JAVA_HOME}/logs"/catalina_out & echo "Server started" && exec sleep infinity &!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!&& exec tail -f "${JAVA_HOME}/logs"/* & waitForDeath; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $?; exit $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%\%%\%\%;;\"; 
" < "${JAVA_HOME}/bin"/catalina jpda startserver yourAppNameHere > "${JAVA_HOME}"/logs"/catalina_out 2>&1 & echo "Started server in background" && exec sleep infinity &echo "Server running in background" && exec tail -f "${JAVA_NAME}"/* & waitForDeath || echo "Error starting server" && exec killall catalina > "${JAVA_HOME}"/\killallcatalina > "${JAVA_HOME}"/\killallcatalina > "${JAVA_HOME}"/\killallcatalina > "${JAVA_HOME}"/killallcatalina > "${JAVA_HOME}"/\killallcatalina > "