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| 1 | +package com.zyj.compile; |
| 2 | + |
| 3 | +import org.omg.SendingContext.RunTime; |
| 4 | + |
| 5 | +import javax.tools.JavaCompiler; |
| 6 | +import javax.tools.ToolProvider; |
| 7 | +import java.io.BufferedReader; |
| 8 | +import java.io.IOException; |
| 9 | +import java.io.InputStream; |
| 10 | +import java.io.InputStreamReader; |
| 11 | +import java.net.URL; |
| 12 | +import java.net.URLClassLoader; |
| 13 | + |
| 14 | +/** |
| 15 | + * 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved. |
| 16 | + * |
| 17 | + * @author : 张勇杰 |
| 18 | + * @date : 2018/11/26 14:58 |
| 19 | + * @Version : v1.0 |
| 20 | + * @description |
| 21 | + **/ |
| 22 | +@SuppressWarnings("all") |
| 23 | +public class Demo01 { |
| 24 | + public static void main(String[] args) throws IOException { |
| 25 | + |
| 26 | + //通过IO流操作，将字符串存储成一个临时文件(Hi.java)，然后调用动态编译方法 |
| 27 | + String str = "public class hi{public static void main(String[] args){System.out.println(\"hi world\");}}"; |
| 28 | + |
| 29 | + |
| 30 | + JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); |
| 31 | + int result = compiler.run(null,null,null,"C:/Users/张勇杰/Desktop/helloworld.java"); |
| 32 | + System.out.println(result == 0?"编译成功":"编译失败"); |
| 33 | + |
| 34 | + //通过Runtime调用执行类 |
| 35 | + /*Runtime run = Runtime.getRuntime(); |
| 36 | +
|
| 37 | + Process process = run.exec("java -cp C:/Users/张勇杰/Desktop/ helloworld"); |
| 38 | +
|
| 39 | + InputStream in = process.getInputStream(); |
| 40 | + BufferedReader reader = new BufferedReader(new InputStreamReader(in)); |
| 41 | + String info=""; |
| 42 | + while((info=reader.readLine())!=null){ |
| 43 | + System.out.println(info); |
| 44 | + }*/ |
| 45 | + |
| 46 | + try{ |
| 47 | + URL[] urls = new URL[]{new URL("file:/"+"C:/Users/张勇杰/Desktop/")}; |
| 48 | + URLClassLoader loader = new URLClassLoader(urls); |
| 49 | + Class c = loader.loadClass("helloworld"); |
| 50 | + //调用加载类的main方法 |
| 51 | + //参数一定要强转成object，由于可变参数是java5.0以后才有，会造成参数不匹配的问题 |
| 52 | + c.getMethod("main",String[].class).invoke(null,(Object) new String[]{}); |
| 53 | + }catch (Exception e){ |
| 54 | + e.printStackTrace(); |
| 55 | + |
| 56 | + } |
| 57 | + } |
| 58 | +} |
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