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来源：伯乐在线专栏作者 - 望天
链接：http://android.jobbole.com/85213/
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接上文
public
static
synchronized
void
load
(
String
...
paths
)
{
if
(
paths
!=
null
&&
paths
.
length
!=
0
)
{
String
[]
javaLibPath
=
paths
;
int
arr
$
=
paths
.
length
;
int
len
$;
String
path
;
for
(
len
$
=
0
;
len
$
arr
$;
++
len
$)
{
String
i
$
=
javaLibPath
[
len
$];
path
=
(
new
File
(
i
$)).
getName
();
if
(
loaded
.
contains
(
path
))
{
log
.
info
(
"already loaded "
+
i
$);
return
;
}
}
javaLibPath
=
System
.
getProperty
(
"java.library.path"
).
split
(
File
.
pathSeparator
);
//这里获得windows下path对应的路径,是个字符串数组
String
[]
var11
=
paths
;
len
$
=
paths
.
length
;
for
(
int
var12
=
0
;
var12
len
$;
++
var12
)
{
path
=
var11
[
var12
];
log
.
config
(
"JNI LIB = "
+
path
);
String
[]
extracted
=
javaLibPath
;
int
len
$
1
=
javaLibPath
.
length
;
for
(
int
i
$
1
=
0
;
i
$
1
len
$
1
;
++
i
$
1
)
{
String
libPath
=
extracted
[
i
$
1
];
File
file
=
(
new
File
(
libPath
,
path
)).
getAbsoluteFile
();
//这里根据path路径和dll的名称拼成一个文件路径,下面检查这个文件是否存在,如果不存在,拼下一个文件路径,如果存在,就加载这个dll
log
.
finest
(
"checking "
+
file
);
if
(
file
.
exists
()
&&
file
.
isFile
()
&&
liberalLoad
(
file
,
path
))
{
return
;
}
}
File
var13
=
extract
(
path
);
if
(
var13
!=
null
&&
liberalLoad
(
var13
,
path
))
{
return
;
}
}
throw
new
ExceptionInInitializerError
(
"unable to load from "
+
Arrays
.
toString
(
paths
));
}
else
{
throw
new
ExceptionInInitializerError
(
"invalid parameters"
);
}
}
其实这段代码本来我没有看太懂,但是架不住调试功能强大,运行一次,加断点,看看内容怎么变化,就知道是什么意思了.
这里假设我的windows下Path环境变量设置为:”D:\Python\Python35\Scripts\;D:\Program Files\Java\jdk1.7.0_15\bin;C:\WINDOWS;D:\BLAS;”,那么javaLibPath的内容就会是这四个组成的字符串数组.接下来取出来第一个,和dll名称(netlib-native_system-win-x86_64.dll)一起拼成一个文件路径”D:\Python\Python35\Scripts\netlib-native_system-win-x86_64.dll”,接下来检查这个路径是否是文件,如果不是,就会继续拼下一个,直到拼出”D:\BLAS\netlib-native_system-win-x86_64.dll”,然后我的dll文件确实放在这里,程序就会加载.
现在我们找到对应的dll文件,这里为netlib-native_system-win-x86_64.dll,然后放在D:\BLAS\这个位置,把D:\BLAS加入path变量,然后重启Intellij(这一步不一定需要,大家自己尝试),让它重新读取path值.
重新运行下Test里的main函数,然后运行结果竟然还是如上的错误,额,是我们刚才的分析都是错误了么?
2.dll库的依赖和依赖查找
我们在跳进加载dll的地方,看看究竟是哪里错了:
private
static
boolean
liberalLoad
(
File
file
,
String
name
)
{
try
{
log
.
finest
(
"attempting to load "
+
file
);
System
.
load
(
file
.
getAbsolutePath
());
log
.
info
(
"successfully loaded "
+
file
);
loaded
.
add
(
name
);
return
true
;
}
catch
(
UnsatisfiedLinkError
var6
)
{
//这里捕获到一个异常,说Can't find dependent libraries.
log
.
log
(
Level
.
FINE
,
"skipping load of "
+
file
,
var6
);
String
tmpdir
=
