mac jdk 6设置

新装的mac 系统10.10 ，jdk是1.8，因为一些工具要使用 jdk 6，以下是设置过程

查看版本

java -version

查看java是再哪：在/usr/bin/java

whereis java

　　

cd /usr/bin
ls -all | grep java
lrwxr-xr-x     1 root   wheel        74  9 23 00:23 java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
lrwxr-xr-x     1 root   wheel        75  9 23 00:23 javac -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javac
lrwxr-xr-x     1 root   wheel        77  9 23 00:23 javadoc -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javadoc
lrwxr-xr-x     1 root   wheel        75  9 23 00:23 javah -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javah
lrwxr-xr-x     1 root   wheel        75  9 23 00:23 javap -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javap
lrwxr-xr-x     1 root   wheel        76  9 23 00:23 javaws -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javaws

都是软链接

cd   /System/Library/Frameworks/JavaVM.framework/Versions/

　

ls -all
drwxr-xr-x   root  wheel      : .
drwxr-xr-x   root  wheel      : ..
lrwxr-xr-x    root  wheel       : 1.4 -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.4. -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.5 -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.5. -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.6 -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.6. -> CurrentJDK
drwxr-xr-x    root  wheel      : A
lrwxr-xr-x    root  wheel        : Current -> A
lrwxr-xr-x    root  wheel       : CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6..jdk/Contents

Current 指向了A，A是1.8的

我自己安装的1.6 在CurrentJDK，删除以前的软链接，执行CurrentJDK，就Ok了，如果要还原到1.8 就重新建立软链接

sudo rm -rf Current

ln -s CurrentJDK Current

 ls -all
total
drwxr-xr-x   root  wheel      : .
drwxr-xr-x   root  wheel      : ..
lrwxr-xr-x    root  wheel       : 1.4 -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.4. -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.5 -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.5. -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.6 -> CurrentJDK
lrwxr-xr-x    root  wheel       : 1.6. -> CurrentJDK
drwxr-xr-x    root  wheel      : A
lrwxr-xr-x    root  wheel       : Current -> CurrentJDK
lrwxr-xr-x    root  wheel       : CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6..jdk/Contents

java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) -Bit Server VM (build 20.65-b04-466.1, mixed mode)

　Mac JDK 1.6 安装 ：是否有毒，自行判断，因为xcodeGoast，心里有点怕怕的。

http://download.csdn.net/download/zw_yuyan/8350587