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2024-07-09 19:27| 来源: 网络整理| 查看: 265

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FileReader;import java.io.IOException;import java.util.ArrayList;import java.util.List;/*************************************************************************** * @Title: RTCutter * @Package com.wdt.main.common.utils * @Description: 精简JRE * @author shimingda * @date 2020/1/13 * @version V1.0 ****************************************************************************/public class RTCutter{ private String source = null; // 类源目录 private String dest = null; // 类拷贝目的目录 String[] jarArr = new String[] {"rt" };

public static void getJar(){ String[] jarArr = new String[] {"rt" }; RTCutter obj = new RTCutter( "D:/exe/rt", "D:/exe/rt2", jarArr); obj.cutRT("D:/exe/classes.txt"); } /*** * * @param source * 类源目录 * @param dest * 类拷贝目的目录 * @param jarArr * 需要的提取的jar文件 */ public RTCutter(String source, String dest, String[] jarArr) { this.source = source; this.dest = dest; this.jarArr = jarArr; }

/*** * 根据classes.txt文件精简rt目录 * @param logName * 提取class明细 */ public void cutRT(String logName) { List cList = getClassesListFromFile(logName); int count = 0; // 用于记录成功拷贝的类数 try { for(String klass : cList) { if (copyClass(klass)) { count++; } else { System.out.println("ERROR " + count + ": " + klass); } } } catch (IOException e) { System.out.println("ERROR: " + e); } System.out.println("count: " + count); }

/*** * 从原jar路径提取相应的类到目标路径，如将java/lang/CharSequence类从rt目录提取到rt1目录 * * @param string * 提取类的全路径 * @return * @throws IOException */ public boolean copyClass(String string) throws IOException { if (string.lastIndexOf("/") == -1) { return false; } String classDir = string.substring(0, string.lastIndexOf("/")); String className = string.substring(string.lastIndexOf("/") + 1, string.length()) + ".class";

boolean result = false;

for (String jar : jarArr) { File srcFile = new File(source + "/" + jar + "/" + classDir + "/" + className); if (!srcFile.exists()) { continue; }

byte buf[] = new byte[256]; FileInputStream fin = new FileInputStream(srcFile);

/* 目标目录不存在,创建 */ File destDir = new File(dest + "/" + jar + "1/" + classDir); if (!destDir.exists()) { destDir.mkdirs(); } File destFile = new File(destDir + "/" + className); FileOutputStream fout = new FileOutputStream(destFile); int len = 0; while ((len = fin.read(buf)) != -1) { fout.write(buf, 0, len); } fout.flush(); result = true; fin.close(); fout.close(); break; } return result; }

/** * 将原始的classes.txt转换为类名列表 * @param source 由-verbose:classes选项生成的classes.txt的路径 */ private List getClassesListFromFile(String source) { BufferedReader reader = null; ArrayList classList = new ArrayList(); try { reader = new BufferedReader(new FileReader(source)); String line = null; while((line = reader.readLine()) != null) { if (line.startsWith("[")) { if (line.startsWith("[Opened")) { continue; } line = line.replace("[Loaded ", ""); int index = line.indexOf("from"); if (index >= 0) { line = line.substring(0, index); } line = line.trim().replace(".", "/"); classList.add(line); } } } catch (Exception e) { e.printStackTrace(); } finally { try { reader.close(); } catch (Exception e) {

} } return classList; }}

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