blocks|key|1150612|text|我假设，如果你能从C%2B%2B转到Java，那么一切都准备好了。我见过你提到的那种产品工作得很好。碰巧我们使用的是CodeMesh。我不是特别支持这个供应商，也不是对他们产品的相对质量发表任何声明，但我已经看到它在相当大的容量场景中工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1150613|我一般会说，如果可能的话，我建议您尽量避免通过JNI进行直接集成。一些简单REST服务方法或基于队列的体系结构往往更易于开发和诊断。如果您仔细使用这些解耦技术，您可以获得相当不错的性能。|1150614|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codemesh.com/products/junction/^0|1I|8|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I'm assuming that if you can get from C++ to Java then you are all set. I've seen a product of the kind you mention work well. As it happens the one we used was <a href="http://www.codemesh.com/products/junction/" rel="nofollow noreferrer">CodeMesh</a>. I'm not specifically endorsing this vendor, or making any statement about their product's relative quality, but I have seen it work in quite a high volume scenario.

I would say generally that if at all possible I would recommend keeping away from direct integration via JNI if you can. Some simple REST service approach, or queue-based architecture will tend to be simpler to develop and diagnose. You can get quite decent perfomance if you use such decoupled technologies carefully.

blocks|key|1150665|text|根据我自己的经验，我试图从python中运行一些java代码，其方式与python中的java代码运行方式类似，但我无法找到一种简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1150666|我对这个问题的解决方案是，在使用适当的包和变量编辑临时文件中的java代码之后，从我的python代码中调用BeanShell解释器作为BeanShell命令，从而将这段java代码作为python脚本运行。|1150667|如果我所讨论的内容在任何方面都有帮助，我很乐意帮助您分享我的解决方案的更多细节。|1150668|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Through my own experience trying to run some java code from within python in a manner similar to how python code runs within java code in python, I was unable to find a straightforward methodology.
My solution to my problem was by running this java code as BeanShell scripts by calling the BeanShell interpreter as a shell command from within my python code after editing the java code in a temporary file with the appropriate packages and variables.
If what I am talking about is helpful in any manner, I am glad to help you share more details of my solutions.

blocks|key|936350|text|我刚刚开始使用JPype+0.5.4.2+(2011年7月)，它看起来工作得很好……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|936351|我在学本图10.04上|936352|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I'm just beginning to use JPype 0.5.4.2 (july 2011) and it looks like it's working nicely... 
I'm on Xubuntu 10.04

blocks|key|1150767|text|如果您使用的是Python3，那么有一个名为JPype1-py3的JPype分支|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1150768|pip+install+JPype1-py3|code-block|syntax|javascript|1150769|这对我在OSX+/+Python+3.4.3上是有效的。(您可能需要export+JAVA_HOME=/Library/Java/JavaVirtualMachines/your-java-version)|style|CODE|1150770|from+jpype+import+*
startJVM(getDefaultJVMPath(),+"-ea")
java.lang.System.out.println("hello+world")
shutdownJVM()|1150771|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/tcalmant/jpype-py3^0|M|A|0|0|0|Y|1W|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@$A|12|B|13|K|L]]|9|@]|C|$]]|$1|M|3|N|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

If you're in Python 3, there's a fork of JPype called <a href="https://github.com/tcalmant/jpype-py3" rel="noreferrer">JPype1-py3</a>

<pre><code>pip install JPype1-py3
</code></pre>

This works for me on OSX / Python 3.4.3. (You may need to <code>export JAVA_HOME=/Library/Java/JavaVirtualMachines/your-java-version</code>)

<pre><code>from jpype import *
startJVM(getDefaultJVMPath(), "-ea")
java.lang.System.out.println("hello world")
shutdownJVM()
</code></pre>

blocks|key|1150813|text|我最近在Python中集成了很多东西，包括Java。我发现最健壮的方法是使用IKVM和C#包装器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1150814|IKVM有一个整洁的小应用程序，允许您获取任何Java+JAR文件，并将其直接转换为.Net+DLL。它只是将JVM字节码转换为CLR字节码。详情请参见http://sourceforge.net/p/ikvm/wiki/Ikvmc/。|offset|length|1150815|转换后的库的行为就像本机C#库一样，您可以在不需要JVM的情况下使用它。然后，可以创建一个C#+DLL包装项目，并添加对转换后的DLL的引用。|1150816|现在，您可以创建一些调用要公开的方法的包装器存根，并将这些方法标记为DllEport。详情请参见https://stackoverflow.com/a/29854281/1977538。|1150817|包装器DLL的作用就像一个本机C库，导出的方法看起来就像导出的C方法。您可以像往常一样使用ctype连接到它们。|1150818|我已经在Python2.7上试过了，但是它应该也能在3.0上工作。在Windows和Linuxes上运行|1150819|如果您碰巧使用C#，那么在将几乎所有内容集成到python中时，这可能是最好的尝试方法。|1150820|entityMap|0|LINK|mutability|MUTABLE|url|http://sourceforge.net/p/ikvm/wiki/Ikvmc/|1|https://stackoverflow.com/a/29854281/1977538^0|0|24|15|0|0|0|1C|18|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|J|3|K|5|6|7|19|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1A|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1B|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]|X|$5|S|T|U|A|$V|Y]]]]

I've been integrating a lot of stuff into Python lately, including Java. The most robust method I've found is to use IKVM and a C# wrapper.

IKVM has a neat little application that allows you to take any Java JAR, and convert it directly to .Net DLL. It simply translates the JVM bytecode to CLR bytecode. See <a href="http://sourceforge.net/p/ikvm/wiki/Ikvmc/" rel="nofollow noreferrer">http://sourceforge.net/p/ikvm/wiki/Ikvmc/</a> for details.

The converted library behaves just like a native C# library, and you can use it without needing the JVM. You can then create a C# DLL wrapper project, and add a reference to the converted DLL.

You can now create some wrapper stubs that call the methods that you want to expose, and mark those methods as DllEport. See <a href="https://stackoverflow.com/a/29854281/1977538">https://stackoverflow.com/a/29854281/1977538</a> for details.

The wrapper DLL acts just like a native C library, with the exported methods looking just like exported C methods. You can connect to them using ctype as usual.

I've tried it with Python 2.7, but it should work with 3.0 as well. Works on Windows and the Linuxes

If you happen to use C#, then this is probably the best approach to try when integrating almost anything into python.

blocks|key|936500|text|我使用的是osx10.10.2，并且成功地使用了JPype。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|936501|遇到了Jnius+(others+have+too)的安装问题，PyJ4安装了Javabridge，但当我尝试使用它时，出现了神秘的错误，JCC有这样的不便之处，首先必须在Java中启动网关服务器，JCC不会安装。最后，JPype终于开始工作了。在Github上有个maintained+fork+of+JPype它的主要优点是(a)安装正确，(b)可以非常有效地将java数组转换为数值数组(np_arr+=+java_arr[:])。|offset|length|style|CODE|936502|安装过程为：|936503|git+clone+https://github.com/originell/jpype.git
cd+jpype
python+setup.py+install|code-block|syntax|javascript|936504|而且您应该能够import+jpype通|936505|以下demo起作用了：|936506|import+jpype+as+jp
jp.startJVM(jp.getDefaultJVMPath(),+"-ea")
jp.java.lang.System.out.println("hello+world")
jp.shutdownJVM()+|936507|当我尝试调用我自己的java代码时，我必须首先编译(javac+./blah/HelloWorldJPype.java)，并且我必须更改默认的JVM路径(否则您将得到难以解释的"class+not+found“错误)。对我来说，这意味着将startJVM命令更改为：|936508|jp.startJVM('/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/MacOS/libjli.dylib',+"-ea")
c+=+jp.JClass('blah.HelloWorldJPype')++
#+Where+my+java+class+file+is+in+./blah/HelloWorldJPype.class
...|936509|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/kivy/pyjnius/issues/23|1|https://github.com/originell/jpype^0|0|5H|K|A|F|0|3P|O|1|0|0|0|7|C|0|0|0|Q|X|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@$D|1A|E|1B|F|G]]|9|@$D|1C|E|1D|1|1E]|$D|1F|E|1G|1|1H]]|A|$]]|$1|H|3|I|5|6|7|1I|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1J|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1K|8|@$D|1L|E|1M|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1N|8|@]|9|@]|A|$]]|$1|S|3|T|5|L|7|1O|8|@]|9|@]|A|$M|N]]|$1|U|3|V|5|6|7|1P|8|@$D|1Q|E|1R|F|G]]|9|@]|A|$]]|$1|W|3|X|5|L|7|1S|8|@]|9|@]|A|$M|N]]|$1|Y|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]|16|$5|11|12|13|A|$14|17]]]]

I'm on OSX 10.10.2, and succeeded in using JPype.

Ran into installation problems with Jnius (<a href="https://github.com/kivy/pyjnius/issues/23" rel="noreferrer">others have too</a>), Javabridge installed but gave mysterious errors when I tried to use it, PyJ4 has this inconvenience of having to start a Gateway server in Java first, JCC wouldn't install. Finally, JPype ended up working. There's a <a href="https://github.com/originell/jpype" rel="noreferrer">maintained fork of JPype</a> on Github. It has the major advantages that (a) it installs properly and (b) it can very efficiently convert java arrays to numpy array (<code>np_arr = java_arr[:]</code>)

The installation process was:

<pre><code>git clone https://github.com/originell/jpype.git
cd jpype
python setup.py install
</code></pre>

And you should be able to <code>import jpype</code>

The following demo worked:

<pre><code>import jpype as jp
jp.startJVM(jp.getDefaultJVMPath(), "-ea")
jp.java.lang.System.out.println("hello world")
jp.shutdownJVM() 
</code></pre>

When I tried calling my own java code, I had to first compile (<code>javac ./blah/HelloWorldJPype.java</code>), and I had to change the JVM path from the default (otherwise you'll get inexplicable "class not found" errors). For me, this meant changing the startJVM command to:

<pre><code>jp.startJVM('/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/MacOS/libjli.dylib', "-ea")
c = jp.JClass('blah.HelloWorldJPype') 
# Where my java class file is in ./blah/HelloWorldJPype.class
...
</code></pre>

What is the best way to call java from python?
(jython and RPC are not an option for me).
I've heard of JCC: <a href="http://pypi.python.org/pypi/JCC/1.9" rel="nofollow noreferrer">http://pypi.python.org/pypi/JCC/1.9</a>
a C++ code generator for calling Java from C++/Python
But this requires compiling every possible call; I would prefer another solution.
I've hear about JPype: <a href="http://jpype.sourceforge.net/" rel="nofollow noreferrer">http://jpype.sourceforge.net/</a>
tutorial: <a href="http://www.slideshare.net/onyame/mixing-python-and-java" rel="nofollow noreferrer">http://www.slideshare.net/onyame/mixing-python-and-java</a>
<pre><code>import jpype 
jpype.startJVM(path to jvm.dll, &quot;-ea&quot;) 
javaPackage = jpype.JPackage(&quot;JavaPackageName&quot;) 
javaClass = javaPackage.JavaClassName 
javaObject = javaClass() 
javaObject.JavaMethodName() 
jpype.shutdownJVM() 
</code></pre>
This looks like what I need.
However, the last release is from Jan 2009 and I see people failing to compile JPype.
Is JPype a dead project?
Are there any other alternatives?

Calling Java from Python

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从python调用java的最佳方式是什么？(jython和RPC不是我的选择)。我听说过JCC：，这是一个用于从C++/Python调用C++的代码生成器，但这需要编译所有可能的调用；我更喜欢另一种解决方案。我听说过JPype：教程：import jpype jpype.startJVM(path to jvm.dl...

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