Java 反编译工具的使用和比较分析（II）

最编程 2024-07-14 22:39:10

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package com.wdbyte.decompiler; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Enumeration; import java.util.HashMap; import java.util.jar.JarFile; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; import org.apache.commons.io.IOUtils; import org.apache.commons.lang3.StringUtils; import org.jd.core.v1.ClassFileToJavaSourceDecompiler; import org.jd.core.v1.api.loader.Loader; import org.jd.core.v1.api.printer.Printer; /** * @author https://github.com/niumoo * @date 2021/05/15 */ public class JDCoreTest { public static void main(String[] args) throws Exception { JDCoreDecompiler jdCoreDecompiler = new JDCoreDecompiler(); Long time = jdCoreDecompiler.decompiler("decompiler.jar","jd_output_jar"); System.out.println(String.format("decompiler time: %dms", time)); } } class JDCoreDecompiler{ private ClassFileToJavaSourceDecompiler decompiler = new ClassFileToJavaSourceDecompiler(); // 存放字节码 private HashMap<String,byte[]> classByteMap = new HashMap<>(); /** * 注意：没有考虑一个 Java 类编译出多个 Class 文件的情况。 * * @param source * @param target * @return * @throws Exception */ public Long decompiler(String source,String target) throws Exception { long start = System.currentTimeMillis(); // 解压 archive(source); for (String className : classByteMap.keySet()) { String path = StringUtils.substringBeforeLast(className, "/"); String name = StringUtils.substringAfterLast(className, "/"); if (StringUtils.contains(name, "$")) { name = StringUtils.substringAfterLast(name, "$"); } name = StringUtils.replace(name, ".class", ".java"); decompiler.decompile(loader, printer, className); String context = printer.toString(); Path targetPath = Paths.get(target + "/" + path + "/" + name); if (!Files.exists(Paths.get(target + "/" + path))) { Files.createDirectories(Paths.get(target + "/" + path)); } Files.deleteIfExists(targetPath); Files.createFile(targetPath); Files.write(targetPath, context.getBytes()); } return System.currentTimeMillis() - start; } private void archive(String path) throws IOException { try (ZipFile archive = new JarFile(new File(path))) { Enumeration<? extends ZipEntry> entries = archive.entries(); while (entries.hasMoreElements()) { ZipEntry entry = entries.nextElement(); if (!entry.isDirectory()) { String name = entry.getName(); if (name.endsWith(".class")) { byte[] bytes = null; try (InputStream stream = archive.getInputStream(entry)) { bytes = IOUtils.toByteArray(stream); } classByteMap.put(name, bytes); } } } } } private Loader loader = new Loader() { @Override public byte[] load(String internalName) { return classByteMap.get(internalName); } @Override public boolean canLoad(String internalName) { return classByteMap.containsKey(internalName); } }; private 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() { String toString = sb.toString(); sb = new StringBuilder(); return 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) {} }; }

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