<table borderColor=#cccccc width="90%" align=center bgColor=#e7e9e9 border=1> <tr> <td>import java.io.*;
import javax.tools.JavaCompiler;
import javax.tools.StandardJavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.ToolProvider;
public class CompilerAPITester {
private static String JAVA_SOURCE_FILE = "DynamicObject.java";
private static String JAVA_CLASS_FILE = "DynamicObject.class";
private static String JAVA_CLASS_NAME = "DynamicObject";
public static void main(String[] args) {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
generateJavaClass();
try {
Iterable<? extends JavaFileObject> sourcefiles = fileManager.getJavaFileObjects(JAVA_SOURCE_FILE);
compiler.getTask(null, fileManager, null, null, null, sourcefiles).call();
fileManager.close();
//创建动态编译得到的DynamicObject类的实例
Class.forName(JAVA_CLASS_NAME).newInstance();
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static void generateJavaClass(){
try {
FileWriter fw = new FileWriter(JAVA_SOURCE_FILE);
BufferedWriter bw = new BufferedWriter(fw);
bw.write("public class "+JAVA_CLASS_NAME+"{");
bw.newLine();
bw.write("public "+JAVA_CLASS_NAME+"(){System.out.println(\"In the constructor of DynamicObject\");}}");
bw.flush();
bw.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}</td> </tr> </table>
程序运行后，会产生DynamicObject.java和DynamicObject.class两个文件，并在控制台输出：
In the constructor of DynamicObject
</td> <td width="175" valign="top"> </td> </tr> </table> </td> </tr> <tr>