在servlet给applet传递中文的时候出现了乱码。
解决方法:
applet:
InputStream in = conn.getInputStream();
DataInputStream textStream;
textStream = new DataInputStream(in);
String line = new String(textStream.readLine().getBytes("ISO_8859_1"), "utf-8");
servlet:
response.setContentType("text/html;charset=utf-8");