字符流接受utf-8乱码解决

原方法：
BufferedReader reader = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String lines;
StringBuffer sb = new StringBuffer("");
while ((lines = reader.readLine()) != null) {
lines = new String(lines.getBytes(), "utf-8");
sb.append(lines);


在new InputStreamReader时默认用文件的编码格式（gbk）解析，若字符串中汉字个数为单数，此时最后一位汉字会因为少1个字节导致乱码；之后的 new String(lines.getBytes(), "utf-8")操作解析不出最后一位

解决方法：

BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));
String lines;
StringBuffer sb = new StringBuffer("");
while ((lines = reader.readLine()) != null) {
lines = new String(lines.getBytes());
sb.append(lines);
}

读取字符流时直接使用utf-8，会直接接受并转化为bgk格式，不会导致乱码；