你好，请帮助我找到解决这个问题的方法，我正在为java程序创建一个web编译器，我已经实现了java内置编译器类来编译代码，它也给出了输出，但它在控制台给出了输出，我想要在返回对象或一些字符串变量中输出，这样我就可以在前面显示输出。我附上完整的代码。
package online_compiler.web;
import java.io.BufferedReader;
import java.io.Console;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;
public class compiler {
public static void myMethod(String name) throws ClassNotFoundException, NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException
{
int result;
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
String program = "public class Main{" + " public static void main (String [] args){"
+ " System.out.println ("Hello, World");"
+ " }" + "}";
JavaSourceFromString jsfs = new JavaSourceFromString("Main", program);
Iterable<? extends JavaFileObject> fileObjects = Arrays.asList( jsfs);
java.util.List<String> options = new ArrayList<String>();
options.add("-d");
options.add("C:\Program Files\Java\jdk-12.0.2\bin");
options.add( "-classpath");
URLClassLoader urlClassLoader =
(URLClassLoader)Thread.currentThread().getContextClassLoader();
StringBuilder sb = new StringBuilder();
for (URL url : urlClassLoader.getURLs()) {
sb.append(url.getFile()).append(java.io.File.pathSeparator);
}
sb.append("C:\\Program Files\\Java\\jdk-12.0.2\\bin");
options.add(sb.toString());
StringWriter output = new StringWriter();
boolean success = compiler.getTask( output, null, null, options, null, fileObjects).call();
if(success) {
name = output.toString();
System.out.print(output);
java.io.File root = new java.io.File("C:\\Program Files\\Java\\jdk-12.0.2\\bin");
URLClassLoader classLoader;
try {
classLoader = URLClassLoader.newInstance(new URL[] { root.toURI().toURL() });
Object obj = null;
Class<?> cls = Class.forName("Main", true, classLoader);
try {
obj = cls.newInstance();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Method m = cls.getMethod("main", new Class[] { String[].class });
Object[] _args = new Object[] { new String[0] };
Object retobj = m.invoke(obj, _args);
System.out.println(retobj);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//logger.info( LOG_PREFIX + "Class has been successfully compiled");
} else {
//throw new Exception( "Compilation failed :" + output);
}
}
static Iterable<JavaSourceFromString> getJavaSourceFromString(String code) {
final JavaSourceFromString jsfs;
jsfs = new JavaSourceFromString("code", code);
return new Iterable<JavaSourceFromString>() {
public Iterator<JavaSourceFromString> iterator() {
return new Iterator<JavaSourceFromString>() {
boolean isNext = true;
public boolean hasNext() {
return isNext;
}
public JavaSourceFromString next() {
if (!isNext)
throw new NoSuchElementException();
isNext = false;
return jsfs;
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
};
}
}
class JavaSourceFromString extends SimpleJavaFileObject {
final String code;
JavaSourceFromString(String name, String code) {
super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
this.code = code;
}
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
主驱动程序代码如下输入图片描述
控制台日志的输出
我试过很多东西在互联网上搜索，但没有工作。我想把输出放到一个对象或者字符串变量中，这样我就可以把输出或者字符串放到前端。
您调用的方法是staticvoid主要。它不返回任何值。如果你创建了一个实际返回一些东西的方法，它应该工作得更好