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主要是学习PL/SQL调用JAVA的方法.

平台:WINDOWS

1.首先使用IDE写好需要调用的java代码，再添加"create or replace and compile java source named 名字 as"，然后在PL/SQL中执行

create or replace and compile java source named getosmac asimport java.io.InputStreamReader;
import java.io.LineNumberReader;public class GetOSMac {/*** 获取MAC地址*/public static String getMac() {String result = "";try {Process process = Runtime.getRuntime().exec("ipconfig /all");/*** 通过执行dos命令IPCONFIG / ALL来获取*/InputStreamReader ir = new InputStreamReader(process.getInputStream());LineNumberReader input = new LineNumberReader(ir);String line;while ((line = input.readLine()) != null)if (line.indexOf("Physical Address") > 0) {String macAddr = line.substring(line.indexOf("-") - 2);result = macAddr;}} catch (java.io.IOException e) {System.err.println("IOException " + e.getMessage());}System.out.println("Mac:" + result);return result;}public static void main(String[] args) {getMac();System.out.println("OK!!!");}}

2.然后创建函数调用该JAVA SOURCE的Fuction

create or replace function GetMac return varchar2 islanguage java name ' GetOSMac.getMac() return java.lang.String'; 

3.调用函数.

SYS@orcl> select GetMac AS MAC from dual;  MAC  
------------------------------------------------  50-E5-49-17-EC-82  已选择 1 行。  

http://blog.csdn.net/edcvf3/article/details/8771453

常见错误及解决办法：

问题一：
ERROR at line 1: ORA-29538: Java not installed

解决方法
1.检查有没有安装JAVA组件
select * from v$option t where t.PARAMETER='Java';
如果返回行说明已安装，如果没有返回行，运行Oracle Universal Installer安装JAVA组件
2.如果在第1步返回行，则检查oracle中有没有dbms_java.
select distinct owner,name from dba_source where lower(NAME)='dbms_java';
如果没有返回行，执行第3步
3.在sqlplus下以sys登陆，执行$ORACLE_HOME/javavm/install/initjvm.sql
SQL>@?/javavm/install/initjvm.sql;

问题二：
ERROR at line 1:
ORA-29532: Java call terminated by uncaught Java exception:
java.security.AccessControlException: the Permission (java.io.FilePermission
/home/accmgrctl/src/server read) has not been granted to SQLVIEW. The PL/SQL to
grant this is dbms_java.grant_permission( 'SQLVIEW',
'SYS:java.io.FilePermission', '/home/accmgrctl/src/server', 'read' )
ORA-06512: at "SQLVIEW.PKG_FILE_API", line 1
解决方法：
这是由于oracle用户没有访问那个目录的权限，把源代码入在oracle有权限访问的目录下
或者用以下语句授权
EXEC Dbms_Java.Grant_Permission('oracle_username','java.io.FilePermission', '*','read ');

create or replace and compile java source named getosmac as
import java.io.InputStreamReader;import java.io.LineNumberReader;
public class GetOSMac {    /**     * 获取MAC地址     */    public static String getMac() {        String result = "";        try {            Process process = Runtime.getRuntime().exec("ipconfig /all");            /**             * 通过执行dos命令IPCONFIG / ALL来获取             */            InputStreamReader ir = new InputStreamReader(                    process.getInputStream());            LineNumberReader input = new LineNumberReader(ir);
            String line;
            while ((line = input.readLine()) != null)
                if (line.indexOf("Physical Address") > 0) {
                    String macAddr = line.substring(line.indexOf("-") - 2);
                    result = macAddr;
                }        } catch (java.io.IOException e) {            System.err.println("IOException " + e.getMessage());        }
        System.out.println("Mac:" + result);        return result;    }
    public static void main(String[] args) {        getMac();        System.out.println("OK!!!");    }
}