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 OracleDriverfrom java.sql import DriverManagerusername = '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 zxJDBCurl = '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#print cursor.description#print cursor.description 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 JavaLanginclude_package "java.lang"endmodule JavaSqlinclude_package 'java.sql'endbegin 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) doputs "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.Sqldef 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)
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