ajax后台处理响应（java）

public static final void sendAsJson(HttpServletResponse response, String str)
{
response.setContentType("application/json;charset=UTF-8");
if (null != str)
try {
response.getWriter().write(str);
} catch (IOException e) {
e.printStackTrace();
}
}

public static final void sendAsText(HttpServletResponse response, String str)
{
response.setContentType("text/html;charset=UTF-8");
if (null != str)
try {
response.getWriter().write(str);
} catch (IOException e) {
e.printStackTrace();
}
}