我想在插件中启动一个Jython解释器,然后在解释器中执行文件。
package com.jakob.jython;
import org.bukkit.plugin.java.JavaPlugin;
import org.python.core.PyObject;
import org.python.util.PythonInterpreter;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Logger;
public class EmbeddedJython extends JavaPlugin {
private static final Logger log = Logger.getLogger("Minecraft");
private PythonInterpreter interpreter;
private PyObject plugin;
public void onEnable() {
log.info("JythonTest enabled");
this.interpreter = new PythonInterpreter();
log.info("Jython interpreter fired up and cooking on gas");
log.info("Loading Python Plugin");
InputStream pythonScript = EmbeddedJython.class.getResourceAsStream("MyPlugin.py");
this.interpreter.execfile(pythonScript, "MyPlugin.py");
log.info("Getting plg method.");
this.plugin = this.interpreter.get("plg");
log.info("Plugin loaded");
log.info(plugin.invoke("onEnable").toString());
}
public void onDisable() {
log.info(plugin.invoke("onDisable").toString());
log.info("Jython disabled");
}
}
在其他测试中,我可以获取Jython解释器并运行字符串,但是当我使用上面的代码片段时,我最终得到的异常看起来像这样:
11:03:38 [SEVERE] Error occurred while enabling JythonTest v0.12 (Is it up to da
te?): null
java.io.IOException: Stream closed
at java.io.BufferedInputStream.getInIfOpen(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at org.python.core.ParserFacade.adjustForBOM(ParserFacade.java:371)
at org.python.core.ParserFacade.prepBufReader(ParserFacade.java:298)
at org.python.core.ParserFacade.prepBufReader(ParserFacade.java:288)
at org.python.core.ParserFacade.parse(ParserFacade.java:183)
at org.python.core.Py.compile_flags(Py.java:1717)
at org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:235
)
at com.jakob.jython.EmbeddedJython.onEnable(EmbeddedJython.java:26)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:125)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:750)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:253)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:132)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:110)
at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:218)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:205)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:145)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:265)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:394)
java.io.IOException: java.io.IOException: Stream closed
at org.python.core.PyException.fillInStackTrace(PyException.java:70)
at java.lang.Throwable.<init>(Throwable.java:181)
at java.lang.Exception.<init>(Unknown Source)
at java.lang.RuntimeException.<init>(Unknown Source)
at org.python.core.PyException.<init>(PyException.java:46)
at org.python.core.PyException.<init>(PyException.java:43)
at org.python.core.Py.JavaError(Py.java:481)
at org.python.core.ParserFacade.fixParseError(ParserFacade.java:104)
at org.python.core.ParserFacade.parse(ParserFacade.java:186)
at org.python.core.Py.compile_flags(Py.java:1717)
at org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:235
)
at com.jakob.jython.EmbeddedJython.onEnable(EmbeddedJython.java:26)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:125)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:750)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:253)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:132)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:110)
at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:218)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:205)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:145)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:265)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:394)
Caused by: java.io.IOException: Stream closed
at java.io.BufferedInputStream.getInIfOpen(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at org.python.core.ParserFacade.adjustForBOM(ParserFacade.java:371)
at org.python.core.ParserFacade.prepBufReader(ParserFacade.java:298)
at org.python.core.ParserFacade.prepBufReader(ParserFacade.java:288)
at org.python.core.ParserFacade.parse(ParserFacade.java:183)
... 13 more
我使用execfile
错了吗?
或者这是一个错误还是我在InputStream
的工作方式中缺少的东西?
答案 0 :(得分:2)
您确定EmbeddedJython.class.getResourceAsStream("MyPlugin.py");
正在寻找资源吗?
如果找不到资源,getResourceAsStream
将返回null
,并且Jython解释器可能会将其视为空(已关闭)流。
您的应用程序应该检查这一点,而不是假设getResourceAsStream
成功。
如果我
private File pythonFile = new File('MyScirpt.py');
然后递getResourceAsStream(pythonFile.getAbsolutePath());
那不行。 getResourceAsStream
方法在类加载器的类路径上查找资源,并期望相对于类路径上的某个条目可以解析的路径。
你可能想这样做:
private File pythonFile = new File('MyScirpt.py');
InputStream is = new FileInputStream(pythonFile);
并将is
传递给解释器。当解释器完成时,您还需要安排流始终关闭......无论发生什么机制。
答案 1 :(得分:0)
我在堆栈跟踪中看到,引用了adjustForBOM
(BOM = Byte Order Mark)。
这可能意味着您的文件MyPlugin.py
与其他适合您的文件存储的编码不同。
您可以尝试使用其他编码重新保存文件,例如UTF-8吗?