java中byte,String,InputStream之间的转换

jekeyhui99

• • import java.io.ByteArrayInputStream;
  • import java.io.ByteArrayOutputStream;
  • import java.io.IOException;
  • import java.io.InputStream;
  • public class InputStreamUtils {
  •     final static int BUFFER_SIZE = 4096;
  •     // 将InputStream转换成String
  •     public static String InputStreamTOString(InputStream in) throws Exception {
  •         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  •         byte[] data = new byte[BUFFER_SIZE];
  •         int count = -1;
  •         while ((count = in.read(data, 0, BUFFER_SIZE)) != -1)
  •             outStream.write(data, 0, count);
  •         data = null;
  •         return new String(outStream.toByteArray(), "ISO-8859-1");
  •     }
  •     // 将InputStream转换成某种字符编码的String
  •     public static String InputStreamTOString(InputStream in, String encoding)
  •             throws Exception {
  •         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  •         byte[] data = new byte[BUFFER_SIZE];
  •         int count = -1;
  •         while ((count = in.read(data, 0, BUFFER_SIZE)) != -1)
  •             outStream.write(data, 0, count);
  •         data = null;
  •         return new String(outStream.toByteArray(), "ISO-8859-1");
  •     }
  •     // 将String转换成InputStream
  •     public static InputStream StringTOInputStream(String in) throws Exception {
  •         ByteArrayInputStream is = new ByteArrayInputStream(in.getBytes("ISO-8859-1"));
  •         return is;
  •     }
  •     // 将InputStream转换成byte数组
  •     public static byte[] InputStreamTOByte(InputStream in) throws IOException {
  •         ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  •         byte[] data = new byte[BUFFER_SIZE];
  •         int count = -1;
  •         while ((count = in.read(data, 0, BUFFER_SIZE)) != -1)
  •             outStream.write(data, 0, count);
  •         data = null;
  •         return outStream.toByteArray();
  •     }
  •     // 将byte数组转换成InputStream
  •     public static InputStream byteTOInputStream(byte[] in) throws Exception {
  •         ByteArrayInputStream is = new ByteArrayInputStream(in);
  •         return is;
  •     }
  •     // 将byte数组转换成String
  •     public static String byteTOString(byte[] in) throws Exception {
  •         InputStream is = byteTOInputStream(in);
  •         return InputStreamTOString(is);
  •     }
  • }