JD-Core is a JAVA decompiler written in JAVA.
- Java Decompiler project home page: http://java-decompiler.github.io
- JD-Core source code: https://github.com/java-decompiler/jd-core
- JCenter Maven repository: https://jcenter.bintray.com/
JD-Core is a standalone JAVA library containing the JAVA decompiler of "Java Decompiler project". It support Java 1.1.8 to Java 12.0, including Lambda expressions, method references and default methods. JD-Core is the engine of JD-GUI.
> git clone https://github.com/java-decompiler/jd-core.git
> cd jd-core
> ./gradlew build
generate "build/libs/jd-core-x.y.z.jar"
- Implement the org.jd.core.loader.Loader interface,
- Implement the org.jd.core.printer.Printer interface,
- And call the method "decompile(loader, printer, internalTypeName);"
- Implement the Loader interface:
Loader loader = new Loader() {
@Override
public byte[] load(String internalName) throws LoaderException {
InputStream is = this.getClass().getResourceAsStream("/" + internalName + ".class");
if (is == null) {
return null;
} else {
try (InputStream in=is; ByteArrayOutputStream out=new ByteArrayOutputStream()) {
byte[] buffer = new byte[1024];
int read = in.read(buffer);
while (read > 0) {
out.write(buffer, 0, read);
read = in.read(buffer);
}
return out.toByteArray();
} catch (IOException e) {
throw new LoaderException(e);
}
}
}
@Override
public boolean canLoad(String internalName) {
return this.getClass().getResource("/" + internalName + ".class") != null;
}
};- Implement the Printer interface
Printer printer = new Printer() {
protected static final String TAB = " ";
protected static final String NEWLINE = "\n";
protected int indentationCount = 0;
protected StringBuilder sb = new StringBuilder();
@Override public String toString() { return sb.toString(); }
@Override public void start(int maxLineNumber, int majorVersion, int minorVersion) {}
@Override public void end() {}
@Override public void printText(String text) { sb.append(text); }
@Override public void printNumericConstant(String constant) { sb.append(constant); }
@Override public void printStringConstant(String constant, String ownerInternalName) { sb.append(constant); }
@Override public void printKeyword(String keyword) { sb.append(keyword); }
@Override public void printDeclaration(int type, String internalTypeName, String name, String descriptor) { sb.append(name); }
@Override public void printReference(int type, String internalTypeName, String name, String descriptor, String ownerInternalName) { sb.append(name); }
@Override public void indent() { this.indentationCount++; }
@Override public void unindent() { this.indentationCount--; }
@Override public void startLine(int lineNumber) { for (int i=0; i<indentationCount; i++) sb.append(TAB); }
@Override public void endLine() { sb.append(NEWLINE); }
@Override public void extraLine(int count) { while (count-- > 0) sb.append(NEWLINE); }
@Override public void startMarker(int type) {}
@Override public void endMarker(int type) {}
};- And call the method "decompile(loader, printer, internalTypeName);"
ClassFileToJavaSourceDecompiler decompiler = new ClassFileToJavaSourceDecompiler();
decompiler.decompile(loader, printer, "path/to/YourClass");
String source = printer.toString();Released under the GNU GPL v3.