c语言程序设计（梁海英）第二版课后答案详解，求哪位大虾帮帮忙，最好有详解，我是初学者，看答案推论，

c语言程序设计（梁海英）第二版课后答案详解，求哪位大虾帮帮忙，最好有详解，我是初学者，看答案推论，

if (entity != null) {
final InputStream instream = entity.getContent();
try {
final StringBuilder sb = new StringBuilder();
final char[] tmp = new char[1024];
final Reader reader = new InputStreamReader(instream,encoding);
int l;
while ((l = reader.read(tmp)) != -1) {
sb.append(tmp, 0, l);
}
body = sb.toString();
} finally {
instream.close();
EntityUtils.consume(entity);
}