InputStream、OutputStream、String的相互转换

1.OutputStream写入String

ByteArrayOutputStream baos = new ByteArrayOutputStream();
//向OutPutStream中写入，如 message.writeTo(baos);
String str = baos.toString();

2.字符串转inputStream

String string;
//
InputStream is = new ByteArrayInputStream(string.getBytes());

3.InputStream转字符串

ByteArrayOutputStream baos = new ByteArrayOutputStream();
int i;
while ((i = is.read()) != -1) {
baos.write(i);
}
String str = baos.toString();
System.out.println(str);


4.String写入OutputStream

OutputStream os = System.out;
os.write(string.getBytes());