字符流接受utf-8亂碼解決

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時默認用文件的編碼格式（gbk）解析，若字符串中漢字個數為單數，此時最后一位漢字會因為少1個字節導致亂碼；之后的 new String(lines.getBytes(), "utf-8")操作解析不出最后一位

解決方法：

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);
}

讀取字符流時直接使用utf-8，會直接接受並轉化為bgk格式，不會導致亂碼；