java中outputStream与inputStream的相互转换

 package com.boco.test;

 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.io.OutputStream;

 public class ConvertUtil {
     //inputStream转outputStream
     public ByteArrayOutputStream parse(InputStream in) throws Exception
     {
         ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
         int ch;
         while ((ch = in.read()) != -1) {
             swapStream.write(ch);
         }
         return swapStream;
     }
     //outputStream转inputStream
     public ByteArrayInputStream parse(OutputStream out) throws Exception
     {
         ByteArrayOutputStream   baos=new   ByteArrayOutputStream();
         baos=(ByteArrayOutputStream) out;
         ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray());
         return swapStream;
     }
     //inputStream转String
     public String parse_String(InputStream in) throws Exception
     {
         ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
         int ch;
         while ((ch = in.read()) != -1) {
             swapStream.write(ch);
         }
         return swapStream.toString();
     }
     //OutputStream 转String
     public String parse_String(OutputStream out)throws Exception
     {
         ByteArrayOutputStream   baos=new   ByteArrayOutputStream();
         baos=(ByteArrayOutputStream) out;
         ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray());
         return swapStream.toString();
     }
     //String转inputStream
     public ByteArrayInputStream parse_inputStream(String in)throws Exception
     {
         ByteArrayInputStream input=new ByteArrayInputStream(in.getBytes());
         return input;
     }
     //String 转outputStream
     public ByteArrayOutputStream parse_outputStream(String in)throws Exception
     {
         return parse(parse_inputStream(in));
     }
 }