String与InputStream相互转换

InputStream   in_nocode   =   new   ByteArrayInputStream(str.getBytes());
InputStream   in_withcode   =   new   ByteArrayInputStream(str.getBytes("UTF-8"));

public String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "/n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}

public   String   inputStream2String   (InputStream   in)   throws   IOException   {
StringBuffer   out   =   new   StringBuffer();
byte[]   b   =   new   byte[4096];
for   (int   n;   (n   =   in.read(b))   !=   -1;)   {
out.append(new   String(b,   0,   n));
}
return   out.toString();
}

public   static   String   inputStream2String(InputStream   is)   throws   IOException{
ByteArrayOutputStream   baos   =   new   ByteArrayOutputStream();
int   i=-1;
while((i=is.read())!=-1){
baos.write(i);
}
return   baos.toString();
}