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yongjie.zhang
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java脚本交互引擎Rhino以及字节码操作javassist
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‎java-Javassist/java-Javassist.iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="module-library" exported="">
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<library>
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<CLASSES>
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<root url="jar://$USER_HOME$/Desktop/jboss-javassist-javassist-85d69ea/javassist.jar!/" />
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</CLASSES>
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<JAVADOC />
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<SOURCES />
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</library>
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</orderEntry>
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</component>
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</module>

‎java-Javassist/src/com/zyj/javassist/Demo01.java

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package com.zyj.javassist;
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import javassist.*;
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import java.io.IOException;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/12/1 13:39
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* @Version : v1.0
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* @description
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**/
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public class Demo01 {
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public static void main(String[] args) throws CannotCompileException, NotFoundException, IOException {
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ClassPool pool = ClassPool.getDefault();
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CtClass cc = pool.makeClass("com.zyj.bean.Emp");
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//创建属性
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CtField f1 = CtField.make("private int empno;", cc);
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CtField f2 = CtField.make("private String ename;", cc);
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cc.addField(f1);
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cc.addField(f2);
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//创建方法
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CtMethod m1 = CtMethod.make("public int getEmpno(){return empno;}", cc);
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CtMethod m2 = CtMethod.make("public void setEmpno(int empno){this.empno=empno;}",cc);
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cc.addMethod(m1);
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cc.addMethod(m2);
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//添加构造器
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CtConstructor constructor = new CtConstructor(new CtClass[]{CtClass.intType,pool.get("java.lang.String")},cc);
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constructor.setBody("{this.empno = empno;this.ename = ename;}");
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cc.addConstructor(constructor);
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cc.writeFile("c:/myjava");//将上面构造好的类写入到c:/myjava中
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}
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}

‎java-Javassist/src/com/zyj/javassist/Demo02.java

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package com.zyj.javassist;
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import javassist.*;
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import java.io.IOException;
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import java.lang.reflect.Method;
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import java.text.MessageFormat;
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import java.util.Arrays;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/12/1 14:04
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* @Version : v1.0
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* @description 测试javassist的API
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**/
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public class Demo02 {
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/**
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* 处理类的基本用法
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*/
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public static void test01() throws IOException, CannotCompileException, NotFoundException {
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ClassPool pool = ClassPool.getDefault();
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CtClass cc = pool.get("com.zyj.javassist.Emp");
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byte[] bytes = cc.toBytecode();
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System.out.println(Arrays.toString(bytes));
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System.out.println(cc.getName());//获得类名
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System.out.println(cc.getSimpleName());//获得简要类名
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System.out.println(cc.getSuperclass());//获得父类
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System.out.println(cc.getInterfaces());//获得接口
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}
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/**
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* 测试产生新的方法
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*/
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public static void test02() throws Exception {
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ClassPool pool = ClassPool.getDefault();
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CtClass cc = pool.get("com.zyj.javassist.Emp");
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//CtMethod m = CtNewMethod.make("public int add(int a,int b){return a+b}",cc);
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CtMethod m = new CtMethod(CtClass.intType,"add",new CtClass[]{CtClass.intType,CtClass.intType},cc);
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m.setModifiers(Modifier.PUBLIC);
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m.setBody("{return $1+$2;}");
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cc.addMethod(m);
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//通过反射调用新生成的方法
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Class clazz = cc.toClass();
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Object obj = clazz.newInstance();//通过调用mp无参构造器，创建新的Emp对象
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Method method = clazz.getDeclaredMethod("add",int.class,int.class);
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Object o = method.invoke(obj, 1, 1);
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System.out.println(o);
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}
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public static void test03()throws Exception{
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ClassPool pool = ClassPool.getDefault();
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CtClass cc = pool.get("com.zyj.javassist.Emp");
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CtMethod cm = cc.getDeclaredMethod("sayHello",new CtClass[]{CtClass.intType});
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cm.insertBefore("System.out.println($1);System.out.println(\"start!!!\");");
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//通过反射调用新生成的方法
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Class clazz = cc.toClass();
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Object obj = clazz.newInstance();
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Method m = clazz.getDeclaredMethod("sayHello",int.class);
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Object result = m.invoke(obj, 1111);
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System.out.println(result);
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}
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public static void main(String[] args) throws Exception {
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test03();
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}
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}

‎java-Javassist/src/com/zyj/javassist/Emp.java

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package com.zyj.javassist;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/12/1 13:39
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* @Version : v1.0
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* @description
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**/
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public class Emp {
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private String empno;
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private String ename;
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public void sayHello(int a){
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System.out.println("sayHello"+a);
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}
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public Emp(String empno, String ename) {
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this.empno = empno;
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this.ename = ename;
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}
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public Emp() {
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}
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public String getEmpno() {
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return empno;
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}
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public void setEmpno(String empno) {
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this.empno = empno;
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}
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public String getEname() {
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return ename;
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}
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public void setEname(String ename) {
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this.ename = ename;
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}
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}

‎java-scriptEngineRhino/java-scriptEngineRhino.iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎java-scriptEngineRhino/src/a.js

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function test() {
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var a =3;
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var b = 4;
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print("invoke js file:"+(a+b));
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}
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test();

‎java-scriptEngineRhino/src/com/zyj/rhino/Demo01.java

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package com.zyj.rhino;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import java.io.FileReader;
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import java.net.URL;
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import java.util.List;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/11/28 12:52
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* @Version : v1.0
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* @description 测试脚本引擎执行javascript代码
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**/
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public class Demo01 {
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public static void main(String[] args) throws Exception {
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//获得脚本引擎对象
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ScriptEngineManager sem = new ScriptEngineManager();
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ScriptEngine engine = sem.getEngineByName("javascript");
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//定义变量,存储到引擎上下文
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engine.put("msg","zhangyongjie is a good man!");
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String str = "var user = {name:'zhangyongjie',age:18,schools:['诸暨中学','温州大学']};";
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str += "print(user.name);";
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//执行脚本
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engine.eval(str);
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engine.eval("msg = 'sxt is a bad school';");
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System.out.println(engine.get("msg"));
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System.out.println("*************************");
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//定义函数
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engine.eval("function add(a,b){var sum = a+b; return sum;}");
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//取得调用接口
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Invocable jsInvoke = (Invocable) engine;
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//执行脚本中定义的方法
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Object obj = jsInvoke.invokeFunction("add",1,2);
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System.out.println(obj);
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//导入其他java包，使用其他保重的java类
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//java1.8之后要这么写。
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String jsCode = "var list = java.util.Arrays.asList(\"温州大学\",\"诸暨中学\")";
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engine.eval(jsCode);
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List<String> list = (List<String>) engine.get("list");
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for(String a:list){
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System.out.println(a);
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}
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//执行一个js文件（将a.js置于项目的src下即可
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URL url = Demo01.class.getClassLoader().getResource("a.js");
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System.out.println(url);
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FileReader fr = new FileReader(url.getPath());
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engine.eval(fr);
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fr.close();
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}
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}

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