使用Python的jar运行Java程序 [英] run Java program with jar from Python

问题描述

我正在尝试使用Python中的jar运行java文件。
我首先运行命令：

I am trying to run a java file with a jar from Python. I first run the command :

java -classpath ".:/Users/blablalba/jackson-all-1.9.0.jar" parseJason

它工作得很好。
然后我写了一个小的python脚本来执行java文件。 （更新：我根据以下建议做了更改。

it worked perfectly. Then I wrote a small python script to execute the java file. (Updated: I made a change based on the suggestion below.

import os.path,subprocess
from subprocess import STDOUT,PIPE

def compile_java(java_file):
    subprocess.check_call(['javac', java_file])

def execute_java(java_file, stdin):
    java_class,ext = os.path.splitext(java_file)
   // cmd = ['java', java_class] change to
    cmd = ['java', 
  '-classpath',  '.:/Users/blablalba/jackson-all-1.9.0.jar', 
  'parseJason']
        proc = subprocess.Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
        stdout,stderr = proc.communicate(stdin)

compile_java('parseJason.java')
execute_java('parseJason.java', 'data.json','output_010.csv')

Data.json是输入文件名，output_010.csv是输出文件名。我的java文件通过读取scanner.system.in来获取这两个参数。

Data.json is the input file name and output_010.csv is the output file name. My java file gets those two parameters through reading the scanner.system.in.

T我运行命令：

    python parseJson.py

我收到以下错误：

import org.codehaus.jackson.map.ObjectMapper;
                                ^
parseJason.java:380: error: cannot find symbol
        ObjectMapper mapper = new ObjectMapper();
        ^
  symbol:   class ObjectMapper
  location: class parseJason
parseJason.java:380: error: cannot find symbol
        ObjectMapper mapper = new ObjectMapper();
                                  ^
  symbol:   class ObjectMapper
  location: class parseJason
3 errors
Traceback (most recent call last):
  File "parseJson.py", line 15, in <module>
    compile_java('parseJason.java')
  File "parseJson.py", line 5, in compile_java
    subprocess.check_call(['javac', java_file])
  File "/Users/***/anaconda2/lib/python2.7/subprocess.py", line 541, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['javac', 'parseJason.java']' returned non-zero exit status 1

任何人都有我的想法在这里失踪？谢谢！

Anyone has ideas what I am missing here? Thanks!

推荐答案

Command '['java', 'parseJason.java']'

该命令应与之前相同

• 缺少类路径


• 主类称为 parseJason ，而不是 parseJason.java

• the classpath is missing
• the main class is called parseJason, not parseJason.java

尝试

cmd = ['java', 
  '-classpath',  '.:/Users/blablalba/jackson-all-1.9.0.jar', 
  'parseJason']

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