英文:
invoke a jar file(java file) from perl script
问题
我正在使用Eclipse，我需要从Perl脚本中调用一个jar文件。
#!"C:\xampp\perl\bin\perl.exe"
print "Content-Type: text/html\n\n";
my @args = ("java", "-jar", "C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar");
system(@args);
这是我在Perl文件（echo.pl）中使用的代码，用于调用jar文件。请问是否存在任何错误在这段代码中："C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar"，这是jar文件所在的路径。
英文:
Im using eclipse and i need to invoke a jar file from the perl script .
#!"C:\xampp\perl\bin\perl.exe"
print "Content-Type: text/html\n\n";
my @args = ("java", "-jar", "C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar");
system(@args);
this is the code which i have used in my perl file(echo.pl) to invoke the jar file could anyone please tell me is there any mistake in this "C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar" this is the path where the jar file is present .
答案1
得分: 1
OP的代码中存在双引号错误的情况，use strict 和 use warnings 将会警告可能的问题。
use strict;
use warnings;
use feature 'say';
print "Content-Type: text/html\n\n";
my @args = ("java", "-jar", "C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar");
say for @args;
输出：
Unrecognized escape \R passed through at misuse_double_quote_1.pl line 6.
Unrecognized escape \A passed through at misuse_double_quote_1.pl line 6.
Unrecognized escape \A passed through at misuse_double_quote_1.pl line 6.
Content-Type: text/html
java
-jar
C:SERSRAJENDRAPRASADHCLIPSEWORKSPACEAPPLICATIONPROTECTOR ARGETAPPLICATIONPROTECTOR-0.0.1-SNAPSHOT.JAR
Perl解释器对双引号字符串进行了插值，通过展开反斜杠序列。
修正后的@args = ('...','...','...')代码如下：
use strict;
use warnings;
use feature 'say';
print "Content-Type: text/html\n\n";
my @args = ('java', '-jar', 'C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar');
say for @args;
输出：
Content-Type: text/html
java
-jar
C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar
更自然的方式是这样写代码：
use strict;
use warnings;
use feature 'say';
say "Content-Type: text/html\n";
my @args = qw/java -jar C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar/;
say for @args;
system(@args);
输出：
Content-Type: text/html
java
-jar
C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar
英文:
OP's code is perfect double quotes misuse case, use strict and use warnings would alarm about potential problem
use strict;
use warnings;
use feature 'say';
print "Content-Type: text/html\n\n";
my @args = ("java", "-jar", "C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar");
say for @args;
Output
Unrecognized escape \R passed through at misuse_double_quote_1.pl line 6.
Unrecognized escape \A passed through at misuse_double_quote_1.pl line 6.
Unrecognized escape \A passed through at misuse_double_quote_1.pl line 6.
Content-Type: text/html
java
-jar
C:SERSRAJENDRAPRASADHCLIPSEWORKSPACEAPPLICATIONPROTECTOR ARGETAPPLICATIONPROTECTOR-0.0.1-SNAPSHOT.JAR
Perl interpreter performed interpolation of double quoted string by expanding backshash sequences.
Correct code for @args = ('...','...','...')
use strict;
use warnings;
use feature 'say';
print "Content-Type: text/html\n\n";
my @args = ('java', '-jar', 'C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar');
say for @args;
Output
Content-Type: text/html
java
-jar
C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar
More natural way would be to write code as
use strict;
use warnings;
use feature 'say';
say "Content-Type: text/html\n";
my @args = qw/java -jar C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar/;
say for @args;
system(@args);
Output
Content-Type: text/html
java
-jar
C:\Users\RajendraPrasadH\eclipseworkspace\ApplicationProtector\target\ApplicationProtector-0.0.1-SNAPSHOT.jar
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