JD-Core 是 Java 反编译开发包,基于这个开发包有一个 GUI 的项目 jd- gui 和一个 Eclipse 插件项目 jd- eclipse 。
编译 jd-core 的方法:
> git clone https://github.com/java-decompiler/jd-core.git > cd jd-core > ./gradlew build
使用方法:
示例代码:
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 flags, String internalTypeName, String name, String descriptor) { sb.append(name); } @Override public void printReference(int flags, String internalTypeName, String name, String descriptor, String ownerInternalName) { sb.append(name); } @Override public void indent() { this.indentationCount++; } @Override public void unindent() { if (this.indentationCount > 0) 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();