项目相关

1. java 调用  exec 执行 命令行程序

public static List exec(String command, String filePath) throws IOException {
        Process process = Runtime.getRuntime().exec(command + filePath);
        List list = new ArrayList();
        InputStream in = process.getInputStream();
        InputStreamReader isr = null;
        BufferedReader ibr = null;
        String line = "";
        isr = new InputStreamReader(in);
        ibr = new BufferedReader(isr);
        try {
            while ((line = ibr.readLine()) != null) {
                list.add(line);
                System.out.println(line);
            }
        } catch (Exception e) {
            System.out.println("error");
        }
        return list;
    }

2.  list

 

public static List readfile(String filepath) throws FileNotFoundException,
            IOException {

        List list = new ArrayList();

        File file = new File(filepath);
        if (!file.isDirectory()) {

        } else if (file.isDirectory()) {
            String[] filelist = file.list();
            for (int i = 0; i < filelist.length; i++) {
                File readfile = new File(filepath + "\\" + filelist[i]);
                if (!readfile.isDirectory()) {

                    String result = readfile.getName();
                    list.add(result.replace("\\", ""));
                } else if (readfile.isDirectory()) {
                    readfile(filepath + "\\" + filelist[i]);
                }
            }
        }
        return list;
    }

3.  java 读取 android 的 public key

    private static java.security.cert.Certificate[] loadCertificates(JarFile jarFile, JarEntry je, byte[] readBuffer) {
        try {
            InputStream is = jarFile.getInputStream(je);
            while (is.read(readBuffer, 0, readBuffer.length) != -1) {
                // not using
            }
            is.close();
            return (java.security.cert.Certificate[]) (je != null ? je.getCertificates() : null);
        } catch (IOException e) {
            System.err.println("Exception reading " + je.getName() + " in " + jarFile.getName() + ": " + e);
        }
        return null;
    }
    private static char[] toChars(byte[] mSignature) {
        byte[] sig = mSignature;
        final int N = sig.length;
        final int N2 = N * 2;
        char[] text = new char[N2];

        for (int j = 0; j < N; j++) {
            byte v = sig[j];
            int d = (v >> 4) & 0xf;
            text[j * 2] = (char) (d >= 10 ? ('a' + d - 10) : ('0' + d));
            d = v & 0xf;
            text[j * 2 + 1] = (char) (d >= 10 ? ('a' + d - 10) : ('0' + d));
        }
        return text;
    }

    public static List parse(String filepath) throws CertificateEncodingException, IOException {
        List list = new ArrayList();
        String mArchiveSourcePath = filepath;
        WeakReference<byte[]> readBufferRef;
        byte[] readBuffer = null;
        synchronized (mSync) {
            readBufferRef = mReadBuffer;
            if (readBufferRef != null) {
                mReadBuffer = null;
                readBuffer = readBufferRef.get();
            }
            if (readBuffer == null) {
                readBuffer = new byte[8192];
                readBufferRef = new WeakReference<byte[]>(readBuffer);
            }
        }
        JarFile jar = new JarFile(mArchiveSourcePath);
        Enumeration entries = jar.entries();
        while (entries.hasMoreElements()) {
            JarEntry je = (JarEntry) entries.nextElement();
            if (je.isDirectory()) {
                continue;
            }
            if (je.getName().startsWith("META-INF/")) {
                continue;
            }
        }
        JarFile jarFile = new JarFile(mArchiveSourcePath);
        java.security.cert.Certificate[] certs = null;
        Enumeration entries1 = jarFile.entries();
        while (entries1.hasMoreElements()) {
            JarEntry je = (JarEntry) entries1.nextElement();
            if (je.isDirectory()) {
                continue;
            }
            if (je.getName().startsWith("META-INF/")) {
                continue;
            }
            java.security.cert.Certificate[] localCerts = loadCertificates(jarFile, je, readBuffer);
            if (localCerts == null) {
                System.err.println("Package has no certificates at entry " + je.getName() + "; ignoring!");
                jarFile.close();
                return null;
            } else if (certs == null) {
                certs = localCerts;
            } else {
                // Ensure all certificates match.
                for (int i = 0; i < certs.length; i++) {
                    boolean found = false;
                    for (int j = 0; j < localCerts.length; j++) {
                        if (certs[i] != null && certs[i].equals(localCerts[j])) {
                            found = true;
                            break;
                        }
                    }
                    if (!found || certs.length != localCerts.length) {
                        System.err.println("Package has mismatched certificates at entry " + je.getName() + "; ignoring!");
                        jarFile.close();
                        return null; // false
                    }
                }
            }
        }
        jarFile.close();
        synchronized (mSync) {
            mReadBuffer = readBufferRef;
        }
        if (certs != null && certs.length > 0) {
            final int N = certs.length;
            for (int i = 0; i < N; i++) {
                String charSig = new String(toChars(certs[i].getEncoded()));
                list.add("type:" + certs[i].getType() + ", public key:" + certs[i].getPublicKey() + ", hash code:" + certs[i].hashCode());

            }
        } else {
            System.err.println("Package has no certificates; ignoring!");
            return null;
        }
        return list;
    }

4. java 设置多线程

ist list = ListFile.readfile(filepath);
        totalCount = list.size();
        count = totalCount / threadNum;
        for (int i = 0; i < 10; i++) {
            PublicKeyParseThread parse = new PublicKeyParseThread();
            parse.setBegin(i * count);
            parse.setEnd((i + 1) * count - 1);
            parse.setList(list);
            Thread thread = new Thread(parse);
            thread.start();
        }

5. db help

Class.forName("com.mysql.jdbc.Driver");
        java.sql.Connection conn = java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/", "root", "");
        java.sql.Statement stmt = conn.createStatement();

        String sql = "select aid from app_base_info where id > " + begin + " and id < " + end;
        java.sql.ResultSet rs = stmt.executeQuery(sql);
        while (rs.next()) {
            System.out.println(rs.getString("aid"));
            list.add(rs.getString("aid"));
        }
        rs.close();
        stmt.close();
        conn.close();