package de.tutorials;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.internal.compiler.ClassFile;
import org.eclipse.jdt.internal.compiler.CompilationResult;
import org.eclipse.jdt.internal.compiler.Compiler;
import org.eclipse.jdt.internal.compiler.DefaultErrorHandlingPolicies;
import org.eclipse.jdt.internal.compiler.ICompilerRequestor;
import org.eclipse.jdt.internal.compiler.IErrorHandlingPolicy;
import org.eclipse.jdt.internal.compiler.IProblemFactory;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
import org.eclipse.jdt.internal.compiler.env.INameEnvironment;
import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.problem.DefaultProblemFactory;
public class JDTCompilerExample {
/**
* @param args
*/
public static void main(String[] args) {
String compilationUnitContent = "package de.tutorials;\n"
+ "public class Fooooooo{\n" + "public static void burp(){\n"
+ "System.out.println(\"burrrrrrrrrrrrrrp\");" + "}\n" + "}";
final String sourceFile = "E:/eclipse/3.1/eclipse/workspace/de.tutorials/src/Fooooooo.java";
try {
FileWriter fw = new FileWriter(sourceFile);
fw.write(compilationUnitContent);
fw.flush();
fw.close();
} catch (IOException e1) {
e1.printStackTrace();
}
final String outputDir = "E:/eclipse/3.1/eclipse/workspace/de.tutorials/bin";
final String packageName = "de.tutorials";
final String targetClassName = "de.tutorials.Fooooooo";
final ClassLoader classLoader = JDTCompilerExample.class
.getClassLoader();
final String fileNames[] = { sourceFile };
final String classNames[] = { targetClassName };
final List problemList = new ArrayList();
class CompilationUnit implements ICompilationUnit {
String className;
String sourceFile;
CompilationUnit(String sourceFile, String className) {
this.className = className;
this.sourceFile = sourceFile;
}
public char[] getFileName() {
return className.toCharArray();
}
public char[] getContents() {
char[] result = null;
try {
InputStreamReader isReader = new InputStreamReader(
new FileInputStream(sourceFile));
Reader reader = new BufferedReader(isReader);
if (reader != null) {
char[] chars = new char[8192];
StringBuffer buf = new StringBuffer();
int count;
while ((count = reader.read(chars, 0, chars.length)) > 0) {
buf.append(chars, 0, count);
}
result = new char[buf.length()];
buf.getChars(0, result.length, result, 0);
}
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
public char[] getMainTypeName() {
int dot = className.lastIndexOf('.');
if (dot > 0) {
return className.substring(dot + 1).toCharArray();
}
return className.toCharArray();
}
public char[][] getPackageName() {
StringTokenizer izer = new StringTokenizer(className, ".");
char[][] result = new char[izer.countTokens() - 1][];
for (int i = 0; i < result.length; i++) {
String tok = izer.nextToken();
result[i] = tok.toCharArray();
}
return result;
}
}
final INameEnvironment env = new INameEnvironment() {
public NameEnvironmentAnswer findType(char[][] compoundTypeName) {
String result = "";
String sep = "";
for (int i = 0; i < compoundTypeName.length; i++) {
result += sep;
result += new String(compoundTypeName[i]);
sep = ".";
}
return findType(result);
}
public NameEnvironmentAnswer findType(char[] typeName,
char[][] packageName) {
String result = "";
String sep = "";
for (int i = 0; i < packageName.length; i++) {
result += sep;
result += new String(packageName[i]);
sep = ".";
}
result += sep;
result += new String(typeName);
return findType(result);
}
private NameEnvironmentAnswer findType(String className) {
InputStream is = null;
try {
if (className.equals(targetClassName)) {
ICompilationUnit compilationUnit = new CompilationUnit(
sourceFile, className);
return new NameEnvironmentAnswer(compilationUnit);
}
String resourceName = className.replace('.', '/')
+ ".class";
is = classLoader.getResourceAsStream(resourceName);
if (is != null) {
byte[] classBytes;
byte[] buf = new byte[8192];
ByteArrayOutputStream baos = new ByteArrayOutputStream(
buf.length);
int count;
while ((count = is.read(buf, 0, buf.length)) > 0) {
baos.write(buf, 0, count);
}
baos.flush();
classBytes = baos.toByteArray();
char[] fileName = className.toCharArray();
ClassFileReader classFileReader = new ClassFileReader(
classBytes, fileName, true);
return new NameEnvironmentAnswer(classFileReader);
}
} catch (IOException e) {
e.printStackTrace();
} catch (org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException e) {
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException exc) {
// Ignore
}
}
}
return null;
}
private boolean isPackage(String result) {
if (result.equals(targetClassName)) {
return false;
}
String resourceName = result.replace('.', '/') + ".class";
InputStream is = classLoader.getResourceAsStream(resourceName);
return is == null;
}
public boolean isPackage(char[][] parentPackageName,
char[] packageName) {
String result = "";
String sep = "";
if (parentPackageName != null) {
for (int i = 0; i < parentPackageName.length; i++) {
result += sep;
String str = new String(parentPackageName[i]);
result += str;
sep = ".";
}
}
String str = new String(packageName);
if (Character.isUpperCase(str.charAt(0))) {
if (!isPackage(result)) {
return false;
}
}
result += sep;
result += str;
return isPackage(result);
}
public void cleanup() {
}
};
final IErrorHandlingPolicy policy = DefaultErrorHandlingPolicies
.proceedWithAllProblems();
final Map settings = new HashMap();
settings.put(CompilerOptions.OPTION_LineNumberAttribute,
CompilerOptions.GENERATE);
settings.put(CompilerOptions.OPTION_SourceFileAttribute,
CompilerOptions.GENERATE);
settings.put(CompilerOptions.OPTION_ReportDeprecation,
CompilerOptions.IGNORE);
settings.put(CompilerOptions.OPTION_LocalVariableAttribute,
CompilerOptions.GENERATE);
settings
.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_4);
settings.put(CompilerOptions.OPTION_TargetPlatform,
CompilerOptions.VERSION_1_4);
final IProblemFactory problemFactory = new DefaultProblemFactory(Locale
.getDefault());
final ICompilerRequestor requestor = new ICompilerRequestor() {
public void acceptResult(CompilationResult result) {
try {
if (result.hasProblems()) {
IProblem[] problems = result.getProblems();
for (int i = 0; i < problems.length; i++) {
IProblem problem = problems[i];
if (problem.isError()) {
String name = new String(problems[i]
.getOriginatingFileName());
problemList.add(new StringBuffer("Problem in ")
.append(name).append("\nMessage: ")
.append(problem.getMessage()).append(
"\nFound at: ").append(
problem.getSourceLineNumber())
.toString());
}
}
}
if (problemList.isEmpty()) {
ClassFile[] classFiles = result.getClassFiles();
for (int i = 0; i < classFiles.length; i++) {
ClassFile classFile = classFiles[i];
char[][] compoundName = classFile.getCompoundName();
String className = "";
String sep = "";
for (int j = 0; j < compoundName.length; j++) {
className += sep;
className += new String(compoundName[j]);
sep = ".";
}
byte[] bytes = classFile.getBytes();
String outFile = outputDir + "/"
+ className.replace('.', '/') + ".class";
FileOutputStream fout = new FileOutputStream(
outFile);
BufferedOutputStream bos = new BufferedOutputStream(
fout);
bos.write(bytes);
bos.close();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
};
ICompilationUnit[] compilationUnits = new ICompilationUnit[classNames.length];
for (int i = 0; i < compilationUnits.length; i++) {
String className = classNames[i];
compilationUnits[i] = new CompilationUnit(fileNames[i], className);
}
Compiler compiler = new Compiler(env, policy, settings, requestor,
problemFactory);
compiler.compile(compilationUnits);
//Hier probieren wir die gerade erzeugte Klasse einfach mal aus... ;-)
try {
Class.forName(targetClassName).getMethod("burp", new Class[0])
.invoke(null, new Object[0]);
} catch (Exception e) {
e.printStackTrace();
}
}
}
. Mein Programm erzeugt während der Laufzeit je nach Benutzer beliebig neue .java-Files. Diese sollen zu einem späteren Zeitpunkt (während der Laufzeit) per Betätigen eines Buttons compiliert und als Thread gestartet werden. 
