ajax异步返回各种数据

 
public static void render(HttpServletResponse response,String contentType,String text){
response.setContentType(contentType);
try {
response.getWriter().write(text);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//发送的是JSON
public static void renderJson(HttpServletResponse response,String text){
render(response, "application/json;charset=UTF-8", text);
}
//发送xml
public static void renderXml(HttpServletResponse response,String text){
render(response, "text/xml;charset=UTF-8", text);
}
//发送text
public static void renderText(HttpServletResponse response,String text){
render(response, "text/plain;charset=UTF-8", text);
}