springboot 2 下 java 代码动态编译动态加载实现_springboot动态编译java-优快云博客

本文链接：https://blog.youkuaiyun.com/vertexz/article/details/107326470

本文介绍了在Spring Boot 2环境下如何实现Java代码的动态编译和加载。在启动Spring Boot应用时需添加-Xbootclasspath参数，并利用Spring Boot的URLClassLoader寻找资源。注意避免直接使用Spring Boot的Loader，而需创建新的Loader。同时，同一ClassLoader不能多次defineClass相同名称的类，否则会导致异常。参考了两个链接资源来实现这一功能。

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先放出代码，再说有几个坑的地方：

package com.yrxd.telemarketing.service;


import org.apache.log4j.Logger;
import org.springframework.boot.loader.LaunchedURLClassLoader;

import javax.lang.model.element.Modifier;
import javax.lang.model.element.NestingKind;
import javax.tools.*;
import java.io.*;
import java.net.*;
import java.nio.CharBuffer;
import java.util.*;
import java.util.jar.JarEntry;

/**
 */
public class CusCompiler {
  static Logger logger = Logger.getLogger(CusCompiler.class);
  static class CustomJavaFileObject implements JavaFileObject {
    private String binaryName;
    private URI uri;
    private String name;

    public String binaryName() {
      return binaryName;
    }

    public CustomJavaFileObject(String binaryName, URI uri) {
      this.uri = uri;
      this.binaryName = binaryName;
      name = uri.getPath() == null ? uri.getSchemeSpecificPart() : uri.getPath();
    }

    @Override
    public Kind getKind() {
      return Kind.CLASS;
    }

    @Override
    public boolean isNameCompatible(String simpleName, Kind kind) {
      String baseName = simpleName + kind.extension;
      return kind.equals(getKind()) && (baseName.equals(getName()) || getName().endsWith("/" + baseName));
    }

    @Override
    public NestingKind getNestingKind() {
      throw new UnsupportedOperationException();
    }

    @Override
    public Modifier getAccessLevel() {
      throw new UnsupportedOperationException();
    }

    @Override
    public URI toUri() {
      return uri;
    }

    @Override
    public String getName() {
      return name;
    }

    @Override
    public InputStream openInputStream() throws IOException {
      return uri.toURL().openStream();
    }

    @Override
    public OutputStream openOutputStream() throws IOException {
      throw new UnsupportedOperationException();
    }

    @Override
    public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
      throw new UnsupportedOperationException();
    }

    @Override
    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
      throw new UnsupportedOperationException();
    }

    @Override
    public Writer openWriter() throws IOException {
      throw new UnsupportedOperationException();
    }

    @Override
    public long getLastModified() {
      return 0;
    }

    @Override
    public boolean delete() {
      throw new UnsupportedOperationException();
    }
  }

  static class MemoryInputJavaFileObject extends SimpleJavaFileObject {
    final String code;

  &n

springboot 2 下 java 代码 动态编译 动态加载 实现

springboot 2 下 java 代码动态编译动态加载实现