java调用脚本语言笔记（jython,jruby,groovy）

有两种方法
1.java se 6以后实现了jsr 223规范
用

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngineManager scriptEngine = factory.getEngineByName("javascript");//或者"js"
scriptEngine.eval(code);//执行一段脚本，code是js代码

 很方便调用脚本
2.可以使用脚本语方本身提供的与java的集成手段

 

与jython集成
使用jsr223:
前提下载jython的包，已实现jsr223
(建议在官网上下载，在安装目录下有jython.jar，http://repo2.maven.org/maven2/org/python/jython/2.5.0/ 这里也有，但是这个包里没有jsr223的实现，看包下存不存在org.python.jsr223)

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngineManager scriptEngine = factory.getEngineByName("python");//或者"jython"
scriptEngine.eval(code);

 

使用PythonInterpreter，可以调用exec(String code)方法:

PythonInterpreter interpreter = new PythonInterpreter();
interpreter.exec(code);

 

访问数据库
使用jdbc:

from oracle.jdbc.driver import OracleDriver
from java.sql import DriverManager

username = 'hr'
password = '123456'
url = 'jdbc:oracle:thin:@localhost:1521:XE'
driver = OracleDriver()
DriverManager.registerDriver(driver)
conn = DriverManager.getConnection(url, username, password)
stmt = conn.createStatement()
sql = "select salary from EMPLOYEES t where t.salary<2300"
rs = stmt.executeQuery(sql)
while (rs.next()):
 print rs.getInt('salary')
rs.close()
stmt.close()

 结果:
2200
2100
2200

 

使用zxJDBC :

from com.ziclix.python.sql import zxJDBC

url = 'jdbc:oracle:thin:@localhost:1521:XE'
username = 'hr'
password = '123456'
driverName = 'oracle.jdbc.driver.OracleDriver'
mysqlConn = zxJDBC.connect(url,username, password,driverName)
cursor = mysqlConn.cursor()     
cursor.execute("select last_name from EMPLOYEES t where t.salary<2300");
#print cursor.fetchone()
list = cursor.fetchall()
for record in list:
    print "name:"+record[0]
#print cursor.description[0]
#print cursor.description[1]

 结果:
name:麦克
name:Olson
name:Philtanker

 

从数据库中查出的中文内容正常的。
而在代码里面的中文全部是乱码或抛异常，未解决。

 

与jruby集成
使用jsr223:

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngineManager scriptEngine = factory.getEngineByName("jruby");//或者"ruby"
scriptEngine.eval(code);

 访问数据库

require 'java'

module JavaLang
  include_package "java.lang"
end

module JavaSql
  include_package 'java.sql'
end

begin
 username = 'hr'
 password = '123456'
 url = 'jdbc:oracle:thin:@localhost:1521:XE'
 driverName = 'oracle.jdbc.driver.OracleDriver'
 JavaLang::Class.forName(driverName).newInstance
 conn = JavaSql::DriverManager.getConnection(url, username, password)
 stmt = conn.createStatement
 sql = "select last_name from EMPLOYEES t where t.salary<2300"
 rs = stmt.executeQuery(sql)
 while (rs.next) do
  puts "名字:"+rs.getString("last_name")
 end
 rs.close
 stmt.close
 conn.close()
rescue JavaLang::ClassNotFoundException
 puts "ClassNotFoundException"
rescue JavaSql::SQLException
 puts "SQLException"
end

 结果:
名字:楹﹀厠
名字:Olson
名字:Philtanker

 

从数据库中查出的中文内容为乱码的。
而在代码里面的中文正常。

 

与groovy集成
使用jsr223:

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngineManager scriptEngine = factory.getEngineByName("groovy");//或者"Groovy"
scriptEngine.eval(code);

 使用GroovyShell:

GroovyShell shell = new GroovyShell();
Script script = shell.parse(code);
Object result = script.run();

 访问数据库

import groovy.sql.Sql

def username = 'hr'
def password = '123456'
def url = 'jdbc:oracle:thin:@localhost:1521:XE'
def driverName = 'oracle.jdbc.driver.OracleDriver'
def sql = Sql.newInstance(url, username, password, driverName)

sql.eachRow("select last_name from EMPLOYEES t where t.salary<2300") {
 println "名字：${it.last_name}"
}

 结果:
名字：麦克
名字：Olson
名字：Philtanker

 

在使用groovy过程中碰到了一个异常
Exception in thread "main" java.lang.VerifyError: (class: groovy/runtime/metaclass/java/util/ArrayListMetaClass, method: super$2$invokeMethod signature: (Ljava/lang/Class;Ljava/lang/Object;Ljava/lang/String;[Ljava/lang/Object;ZZ)Ljava/lang/Object;) Illegal use of nonvirtual function call
这个异常解决花了很长时间
是因为在原来项目中存在json-lib-2.1.jar(有可能名称为json-lib-2.1-jdk15.jar)，这个包是用来处理json的，与groovy1.7.5存在冲突,更新为json-lib-2.3.jar即可
(json-lib里有一些groovy运行时处理的内容)

 

评论

1 楼 song_27149 2017-11-03  

groovy异常说明解决了我目前的问题，十分感谢！