ajax经典案例(适合初学者参考)

============================== POST提交 ================================= 1。页面 ... var url = "encodeservlet"; xmlhttp.open("POST", url, true); xmlhttp.onreadystatechange = processResponse; xmlhttp.setRequestHeader("content-type","application/x-www-form-urlencoded;charset=UTF-8"); xmlhttp.send("user="+document.getElementById("name").value); ... 2。servlet String key = request.getParameter("user"); //key正常显示中文 response.setContentType(CONTENT_TYPE); response.setCharacterEncoding("UTF-8"); //页面中xmlhttp.responseText正常显示中文 PrintWriter out = response.getWriter(); out.print(key); 也可以不在页面中设置charsset=UTF-8,即改为 xmlhttp.setRequestHeader("content-type","application/x-www-form-urlencoded"); servlet中加 request.setCharacterEncoding("UTF-8"); ============================== GET提交 =================================== 方法一： 1。页面 ... var url = "encodeservlet?user="+document.getElementById("name").value; url=encodeURI(url); url=encodeURI(url); xmlhttp.open("GET", url, true); xmlhttp.onreadystatechange = processResponse; xmlhttp.send(null); ... 2。servlet String key = request.getParameter("user"); key = java.net.URLDecoder.decode(key, "UTF-8"); //key正常显示中文 response.setContentType(CONTENT_TYPE); response.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); out.print(key); 方法二： 1。页面 ... var url = "encodeservlet?user="+document.getElementById("name").value; xmlhttp.open("GET", url, true); xmlhttp.onreadystatechange = processResponse; xmlhttp.send(null); ... 2。servlet String key = request.getParameter("user"); key = new String(key.getBytes("ISO-8859-1"), "GBK"); //key正常显示中文 response.setContentType(CONTENT_TYPE); response.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); out.print(key);