Java 混合编程

//Client

Context namingContext = new InitialContext();

// 开始查找 RMI 注册表上有哪些绑定的服务

Enumeration<NameClassPair> e = namingContext.list("rmi://127.0.0.1:8001/");

while (e.hasMoreElements())

    System.out.println(e.nextElement().getName());

// 获取某一个地址上的服务类

String url = "rmi://127.0.0.1:8001/warehouse1";      

Warehouse centralWarehouse = (Warehouse) namingContext.lookup(url);

/*

// 接口类

public interface Warehouse extends Remote

{  

   double getPrice (String description) throws RemoteException;

}

*/

// 输入参数  取得结果

String descr = "面包机";

double price = centralWarehouse.getPrice(descr);

System.out.println(descr + ": " + price);

//Server

System.out.println("产生服务器对象");

WarehouseImpl centralWarehouse = new WarehouseImpl();

System.out.println("将服务器对象绑定在8001端口，对外提供服务");

LocateRegistry.createRegistry(8001);// 定义端口号

Naming.rebind("rmi://127.0.0.1:8001/warehouse1", centralWarehouse);

// 实现类

public class WarehouseImpl extends UnicastRemoteObject implements Warehouse

{

   private Map<String, Double> prices;

   public WarehouseImpl() throws RemoteException

   {

      // 物品列表

      prices = new HashMap<>();

      prices.put("面包机", 24.95);

      prices.put("微波炉", 49.95);

   }

   public double getPrice(String description) throws RemoteException

   {

      Double price = prices.get(description);

      return price == null ? 0 : price;

   }

}

// 接口类

public interface Warehouse extends Remote

{  

   double getPrice(String description) throws RemoteException;

}

class HelloNative {

    public static native void greeting();

}

HelloNative.greeting();

static {

    System.loadLibrary("HelloNative"); //dll 名字

}

ScriptEngine engine = new ScriptEngineManager().getEngineByName(“nashorn”)

//Test1

ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn"); 

engine.put("a", 100);

engine.put("b", 200);

engine.eval("var c = a+b");

String result = engine.get("c").toString();

System.out.println(result);

//Test2

ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn"); 

SimpleBindings simpleBindings = new SimpleBindings(); // 传递参数到 js

simpleBindings.put("a", 100); 

simpleBindings.put("b", 200); 

Object result = engine.eval("load('src/edu/ecnu/sum2.js')", simpleBindings);

/*

src/edu/ecnu/sum2.js

c = a + b;

*/

System.out.println(result);

//Test3

ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn"); 

FileReader scriptFile = new FileReader("src/edu/ecnu/sum3.js");

/*

src/edu/ecnu/sum3.js

function sum(a, b)

{

   return a + b;

}

*/

engine.eval(scriptFile);

Invocable in = (Invocable) engine;

String result = in.invokeFunction("sum",100,200).toString();

System.out.println(result);

// 执行 Python 程序语句

PythonInterpreter pi = new PythonInterpreter();

pi.exec("import sys");

pi.set("a", new PyInteger(42));

pi.exec("print a");

pi.exec("x = 2+2");

PyObject x = pi.get("x");

System.out.println("x: " + x);

// 执行 Python 文件

PythonInterpreter pi = new PythonInterpreter();

pi.execfile("src/main/java/edu/ecnu/hello.py");

pi.cleanup();

pi.close();

// 执行 Python 文件并传参

try (PythonInterpreter pi = new PythonInterpreter()) {

    pi.set("cnt", 5);

    pi.execfile("src/main/java/edu/ecnu/randomSum.py");

    PyObject sum = pi.get("sum");

    System.out.println("Sum is: " + sum);

}

/*

src/main/java/edu/ecnu/randomSum.py

from java.util import Random

r = Random()

sum = 0

for i in xrange(cnt):

    randomNum = r.nextInt()

    print randomNum

    sum += randomNum

*/

// 调用 Python 程序中的函数

PythonInterpreter pi = new PythonInterpreter();        

pi.execfile("src/main/java/edu/ecnu/calculator1.py");

PyFunction pf = pi.get("power", PyFunction.class);

PyObject result = pf.__call__(Py.newInteger(2), Py.newInteger(3)); //2^3

System.out.println(result);

pi.cleanup();

pi.close();

/*

src/main/java/edu/ecnu/calculator1.py

import math

def power(x, y):

    return math.pow(x, y)

*/

// 调用 Python 程序中的类

PythonInterpreter pi = new PythonInterpreter();

pi.execfile("src/main/java/edu/ecnu/calculator2.py");

// 在 Java 中调用 Python 对象实例的方法

String pythonClassName = "Calculator";  //python 类名        

String pythonObjName = "cal"; //python 对象名    

pi.exec(pythonObjName + "=" + pythonClassName + "()"); // 实例化 python 对象        

PyObject pyObj = pi.get(pythonObjName); // 获取实例化的 python 对象

// 调用 python 对象方法，传递参数并接收返回值

PyObject result = pyObj.invoke("power", new PyObject[] {Py.newInteger(2), Py.newInteger(3)}); 

double power = Py.py2double(result);

System.out.println(power);

pi.cleanup();

pi.close();

/*

import math

class Calculator(object):

    def power(self, x, y):

        return math.pow(x,y)

*/

/**

* use wsimport to parse wsdl

* wsimport -keep -verbose http://ws.webxml.com.cn/WebServices/MobileCodeWS.asmx?WSDL

* copy the generated class to this project, and invoke them

* 

* 调用手机号查询 web service

* @param args

*/

MobileCodeWS mobileCodeWS = new MobileCodeWS();

MobileCodeWSSoap  mobileCodeWSSoap = mobileCodeWS.getMobileCodeWSSoap();

String tel=mobileCodeWSSoap.getMobileCodeInfo("13722222222",null); // 修改为有效号码

System.out.println(tel);

Process p;

String cmd = "ipconfig /all";  // 查看 ip 地址

try {

    // 执行命令

    p = Runtime.getRuntime().exec(cmd);

    // 取得命令结果的输出流

    InputStream fis = p.getInputStream();

    // 用一个读输出流类去读

    InputStreamReader isr = new InputStreamReader(fis);

    // 用缓冲器读行

    BufferedReader br = new BufferedReader(isr);

    String line = null;

    // 直到读完为止

    while ((line = br.readLine()) != null) {

        System.out.println(line);

    }

    System.out.println("");

    int exitVal = p.waitFor(); // 获取进程最后返回状态

    System.out.println("Process exitValue: " + exitVal);

} catch (Exception e) {

    e.printStackTrace();

}