com.gitee.huanminabc.utils_common.obj.dynamicbean.DynamicClassLoader Maven / Gradle / Ivy
package com.gitee.huanminabc.utils_common.obj.dynamicbean;
import com.gitee.huanminabc.utils_common.base.UniversalException;
import javax.tools.*;
import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Objects;
public class DynamicClassLoader {
/**
* 字符串class版本 装载字符串成为java可执行文件也就像xx.class文件,
* 这个版本是没有java源文件而是直接生成class文件到包路径下,如果包路径不存在是会自动创建的
* @param className className
* @param javaCodes javaCodes
* @return Class
*/
public static Class compile(String className, String javaCodes) {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
StrSrcJavaObject srcObject = new StrSrcJavaObject(className, javaCodes);
Iterable fileObjects = Collections.singletonList(srcObject);
String flag = "-d";
String outDir = "";
try {
File classPath = new File(Objects.requireNonNull(Thread.currentThread().getContextClassLoader().getResource("")).toURI());
outDir = classPath.getAbsolutePath() + File.separator;
} catch (URISyntaxException e1) {
e1.printStackTrace();
}
Iterable options = Arrays.asList(flag, outDir);
JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, null, options, null, fileObjects);
boolean result = task.call();
if (result) {
try {
return Class.forName(className);
} catch (ClassNotFoundException e) {
UniversalException.logError(e);
}
}
return null;
}
private static class StrSrcJavaObject extends SimpleJavaFileObject {
private String content;
StrSrcJavaObject(String name, String content) {
super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
this.content = content;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return content;
}
}
}