在linux上使用yum安装jdk

1.查找java相关得列表

[qyf@localhost ~]$ yum -y list java*

执行结果

1. [qyf@localhost ~]$ yum -y list java*
2. Loaded plugins: fastestmirror
3. base | 1.1 kB 00:00
4. base/primary | 995 kB 00:00
5. base 2789/2789
6. extras | 2.1 kB 00:00
7. extras/primary_db | 164 kB 00:20
8. updates | 1.9 kB 00:00
9. updates/primary_db | 422 kB 00:01
10. Available Packages
11. java-1.4.2-gcj-compat.i386 1.4.2.0-40jpp.115 base
12. java-1.4.2-gcj-compat-devel.i386 1.4.2.0-40jpp.115 base
13. java-1.4.2-gcj-compat-javadoc.i386 1.4.2.0-40jpp.115 base
14. java-1.4.2-gcj-compat-src.i386 1.4.2.0-40jpp.115 base
15. java-1.6.0-openjdk.i386 1:1.6.0.0-5.1.13.3.el5_10 updates
16. java-1.6.0-openjdk-demo.i386 1:1.6.0.0-5.1.13.3.el5_10 updates
17. java-1.6.0-openjdk-devel.i386 1:1.6.0.0-5.1.13.3.el5_10 updates
18. java-1.6.0-openjdk-javadoc.i386 1:1.6.0.0-5.1.13.3.el5_10 updates
19. java-1.6.0-openjdk-src.i386 1:1.6.0.0-5.1.13.3.el5_10 updates
20. java-1.7.0-openjdk.i386 1:1.7.0.55-2.4.7.1.el5_10 updates
21. java-1.7.0-openjdk-demo.i386 1:1.7.0.55-2.4.7.1.el5_10 updates
22. java-1.7.0-openjdk-devel.i386 1:1.7.0.55-2.4.7.1.el5_10 updates
23. java-1.7.0-openjdk-javadoc.i386 1:1.7.0.55-2.4.7.1.el5_10 updates
24. java-1.7.0-openjdk-src.i386 1:1.7.0.55-2.4.7.1.el5_10 updates
25. java_cup.i386 1:0.10-0.k.6jpp.1 base
26. java_cup-javadoc.i386 1:0.10-0.k.6jpp.1 base
27. java_cup-manual.i386 1:0.10-0.k.6jpp.1 base
28. javacc.i386 4.0-3jpp.3 base
29. javacc-demo.i386 4.0-3jpp.3 base
30. javacc-manual.i386 4.0-3jpp.3 base

2.使用root用户安装
安装时提醒必须使用root用户，sudo都不行。

[qyf@localhost ~]$ yum -y install java-1.6.0-openjdk*

执行结果

1. [qyf@localhost ~]$ yum -y install java-1.6.0-openjdk*
   
2. Loaded plugins: fastestmirror
3. Loading mirror speeds from cached hostfile
4. * base: mirror.bit.edu.cn
5. * extras: mirror.bit.edu.cn
6. * updates: centos.ustc.edu.cn
7. base | 1.1 kB 00:00
8. base/primary | 995 kB 00:07
9. base 2789/2789
10. extras | 2.1 kB 00:00
11. extras/primary_db | 164 kB 00:02
12. updates | 1.9 kB 00:00
13. updates/primary_db | 422 kB 00:07
14. Setting up Install Process
15. Resolving Dependencies
16. --> Running transaction check
17. ---> Package java-1.6.0-openjdk.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated
18. --> Processing Dependency: jpackage-utils >= 1.7.3-1jpp.2 for package: java-1.6.0-openjdk
19. --> Processing Dependency: libgif.so.4 for package: java-1.6.0-openjdk
20. --> Processing Dependency: tzdata-java for package: java-1.6.0-openjdk
21. ---> Package java-1.6.0-openjdk-demo.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated
22. ---> Package java-1.6.0-openjdk-devel.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated
23. ---> Package java-1.6.0-openjdk-javadoc.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated
24. ---> Package java-1.6.0-openjdk-src.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated
25. --> Running transaction check
26. ---> Package giflib.i386 0:4.1.3-7.3.3.el5 set to be updated
27. ---> Package jpackage-utils.noarch 0:1.7.3-1jpp.3.el5 set to be updated
28. ---> Package tzdata-java.i386 0:2014b-1.el5 set to be updated
29. --> Finished Dependency Resolution
30. 
    
31. Dependencies Resolved
32. 
    
33. ================================================================================
34. Package Arch Version Repository
35. Size
36. ================================================================================
37. Installing:
38. java-1.6.0-openjdk i386 1:1.6.0.0-5.1.13.3.el5_10 updates 44 M
39. java-1.6.0-openjdk-demo i386 1:1.6.0.0-5.1.13.3.el5_10 updates 2.2 M
40. java-1.6.0-openjdk-devel i386 1:1.6.0.0-5.1.13.3.el5_10 updates 15 M
41. java-1.6.0-openjdk-javadoc i386 1:1.6.0.0-5.1.13.3.el5_10 updates 20 M
42. java-1.6.0-openjdk-src i386 1:1.6.0.0-5.1.13.3.el5_10 updates 39 M
43. Installing for dependencies:
44. giflib i386 4.1.3-7.3.3.el5 base 39 k
45. jpackage-utils noarch 1.7.3-1jpp.3.el5 base 60 k
46. tzdata-java i386 2014b-1.el5 updates 172 k
47. 
    
48. Transaction Summary
49. ================================================================================
50. Install 8 Package(s)
51. Upgrade 0 Package(s)
52. 
    
53. Total download size: 120 M
54. Downloading Packages:
55. (1/8): giflib-4.1.3-7.3.3.el5.i386.rpm | 39 kB 00:00
56. (2/8): jpackage-utils-1.7.3-1jpp.3.el5.noarch.rpm | 60 kB 00:00
57. (3/8): tzdata-java-2014b-1.el5.i386.rpm | 172 kB 00:04
58. (4/8): java-1.6.0-openjdk-demo-1.6.0.0-5.1.13.3.el5_10.i386.rpm | 2.2 MB 00:47
59. (5/8): java-1.6.0-openjdk-devel-1.6.0.0-5.1.13.3.el5_10.i386.rpm | 15 MB 04:25
60. (6/8): java-1.6.0-openjdk-javadoc-1.6.0.0-5.1.13.3.el5_10.i386.rpm (17%) 19% [============ ] 81 kB/s | 3.8 MB 03:19 ETA

最后一行就是在下载jdk了，这里我们安装jdk1.6相关得全部包。

3.确认是否安装成功
[qyf@localhost ~]$ java -version

执行结果

1. [qyf@localhost ~]$ java -version
   
2. java version "1.6.0_30"
3. OpenJDK Runtime Environment (IcedTea6 1.13.3) (rhel-5.1.13.3.el5_10-i386)
4. OpenJDK Client VM (build 23.25-b01, mixed mode)

正确显示了jdk版本信息就说明安装成功了。

4.默认情况下jdk安装得路径

/usr/lib/jvm

由于我们得机器可能同时安装好几个版本得jdk，所以在/etc/alternatives目录下会有一个java链接到具体的java命令。而这个/etc/alternatives/java会被/usr/bin/java链接。从而java命令就被设置到了shell环境中。