+ * This class provides static utility methods for input/output operations. + *
+ * The byte-to-char methods and char-to-byte methods involve a conversion step. + * Two methods are provided in each case, one that uses the platform default + * encoding and the other which allows you to specify an encoding. You are + * encouraged to always specify an encoding because relying on the platform + * default can lead to unexpected results, for example when moving from + * development to production. + *
+ * All the methods in this class that read a stream are buffered internally.
+ * This means that there is no cause to use a BufferedInputStream
+ * or BufferedReader. The default buffer size of 4K has been shown
+ * to be efficient in tests.
+ *
+ * Wherever possible, the methods in this class do not flush or close + * the stream. This is to avoid making non-portable assumptions about the + * streams' origin and further use. Thus the caller is still responsible for + * closing streams after use. + *
+ * Origin of code: Excalibur.
+ */
+public class IOUtils {
+ // NOTE: This class is focused on InputStream, OutputStream, Reader and
+ // Writer. Each method should take at least one of these as a parameter,
+ // or return one of them.
+
+ private static final int EOF = -1;
+
+ /**
+ * The default buffer size ({@value}) to use for
+ * {@link #copyLarge(InputStream, OutputStream)}
+ * and
+ * {@link (Reader, Writer)}
+ */
+ private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
+
+ /**
+ * Instances should NOT be constructed in standard programming.
+ */
+ public IOUtils() {
+ super();
+ }
+
+ /**
+ * Closes a Closeable unconditionally.
+ *
+ * Equivalent to {@link Closeable#close()}, except any exceptions will be ignored. This is typically used in + * finally blocks. + *
+ * Example code: + *
+ *
+ * Closeable closeable = null;
+ * try {
+ * closeable = new FileReader("foo.txt");
+ * // process closeable
+ * closeable.close();
+ * } catch (Exception e) {
+ * // error handling
+ * } finally {
+ * IOUtils.closeQuietly(closeable);
+ * }
+ *
+ * + * Closing all streams: + *
+ *
+ * try {
+ * return IOUtils.copy(inputStream, outputStream);
+ * } finally {
+ * IOUtils.closeQuietly(inputStream);
+ * IOUtils.closeQuietly(outputStream);
+ * }
+ *
+ *
+ * @param closeable the objects to close, may be null or already closed
+ * @since 2.0
+ */
+ public static void closeQuietly(final Closeable closeable) {
+ try {
+ if (closeable != null) {
+ closeable.close();
+ }
+ } catch (final IOException ioe) {
+ // ignore
+ }
+ }
+
+ // copy from InputStream
+ //-----------------------------------------------------------------------
+ /**
+ * Copies bytes from an InputStream to an
+ * OutputStream.
+ *
+ * This method buffers the input internally, so there is no need to use a
+ * BufferedInputStream.
+ *
+ * Large streams (over 2GB) will return a bytes copied value of
+ * -1 after the copy has completed since the correct
+ * number of bytes cannot be returned as an int. For large streams
+ * use the copyLarge(InputStream, OutputStream) method.
+ *
+ * @param input the InputStream to read from
+ * @param output the OutputStream to write to
+ * @return the number of bytes copied, or -1 if > Integer.MAX_VALUE
+ * @throws NullPointerException if the input or output is null
+ * @throws IOException if an I/O error occurs
+ * @since 1.1
+ */
+ public static int copy(final InputStream input, final OutputStream output) throws IOException {
+ final long count = copyLarge(input, output);
+ if (count > Integer.MAX_VALUE) {
+ return -1;
+ }
+ return (int) count;
+ }
+
+ /**
+ * Copies bytes from a large (over 2GB) InputStream to an
+ * OutputStream.
+ *
+ * This method buffers the input internally, so there is no need to use a
+ * BufferedInputStream.
+ *
+ * The buffer size is given by {@link #DEFAULT_BUFFER_SIZE}.
+ *
+ * @param input the InputStream to read from
+ * @param output the OutputStream to write to
+ * @return the number of bytes copied
+ * @throws NullPointerException if the input or output is null
+ * @throws IOException if an I/O error occurs
+ * @since 1.3
+ */
+ public static long copyLarge(final InputStream input, final OutputStream output)
+ throws IOException {
+
+ byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
+ long count = 0;
+ int n = 0;
+ while (EOF != (n = input.read(buffer))) {
+ output.write(buffer, 0, n);
+ count += n;
+ }
+ return count;
+ }
+
+ /**
+ * Reads bytes from an input stream.
+ * This implementation guarantees that it will read as many bytes
+ * as possible before giving up; this may not always be the case for
+ * subclasses of {@link InputStream}.
+ *
+ * @param input where to read input from
+ * @param buffer destination
+ * @param offset initial offset into buffer
+ * @param length length to read, must be >= 0
+ * @return actual length read; may be less than requested if EOF was reached
+ * @throws IOException if a read error occurs
+ * @since 2.2
+ */
+ public static int read(final InputStream input, final byte[] buffer, final int offset, final int length)
+ throws IOException {
+ if (length < 0) {
+ throw new IllegalArgumentException("Length must not be negative: " + length);
+ }
+ int remaining = length;
+ while (remaining > 0) {
+ final int location = length - remaining;
+ final int count = input.read(buffer, offset + location, remaining);
+ if (EOF == count) { // EOF
+ break;
+ }
+ remaining -= count;
+ }
+ return length - remaining;
+ }
+
+ /**
+ * Reads the requested number of bytes or fail if there are not enough left.
+ *
+ * This allows for the possibility that {@link InputStream#read(byte[], int, int)} may + * not read as many bytes as requested (most likely because of reaching EOF). + * + * @param input where to read input from + * @param buffer destination + * @param offset initial offset into buffer + * @param length length to read, must be >= 0 + * + * @throws IOException if there is a problem reading the file + * @throws IllegalArgumentException if length is negative + * @throws EOFException if the number of bytes read was incorrect + * @since 2.2 + */ + public static void readFully(final InputStream input, final byte[] buffer, final int offset, final int length) + throws IOException { + final int actual = read(input, buffer, offset, length); + if (actual != length) { + throw new EOFException("Length to read: " + length + " actual: " + actual); + } + } + + /** + * Reads the requested number of bytes or fail if there are not enough left. + *
+ * This allows for the possibility that {@link InputStream#read(byte[], int, int)} may
+ * not read as many bytes as requested (most likely because of reaching EOF).
+ *
+ * @param input where to read input from
+ * @param buffer destination
+ *
+ * @throws IOException if there is a problem reading the file
+ * @throws IllegalArgumentException if length is negative
+ * @throws EOFException if the number of bytes read was incorrect
+ * @since 2.2
+ */
+ public static void readFully(final InputStream input, final byte[] buffer) throws IOException {
+ readFully(input, buffer, 0, buffer.length);
+ }
+}
diff --git a/src/main/java/com/yexuejc/base/encrypt/RSA.java b/src/main/java/com/yexuejc/base/encrypt/RSA.java
new file mode 100644
index 0000000..fa8c1e6
--- /dev/null
+++ b/src/main/java/com/yexuejc/base/encrypt/RSA.java
@@ -0,0 +1,186 @@
+package com.yexuejc.base.encrypt;
+
+
+import org.apache.commons.codec.binary.Base64;
+
+import javax.crypto.Cipher;
+import java.io.ByteArrayOutputStream;
+import java.security.*;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * RSA加解密 配置模式
+ *
+ * @ClassName: RSA
+ * @Description:
+ * @author: maxf
+ * @date: 2018/5/15 14:39
+ */
+public class RSA {
+
+ public static final String CHARSET = "UTF-8";
+ public static final String RSA_ALGORITHM = "RSA";
+
+ public static Map