从零开始的JavaWeb（一）Servlet

1、从请求中获取参数

String username=request.getParameter("username");

2、设置返回值的格式对于Json串

response.setContentType("application/json;charset=utf-8");  
response.setCharacterEncoding("utf-8");

对于纯文本

response.setContentType("application/text;charset=utf-8");  
response.setCharacterEncoding("utf-8");

3、输出返回值

response.getWriter().print("success");