ajax post提交乱码
6月30日

??? alert(response);
});
结果：正确显示

$.get("2.jsp", "name=中文",function(response){
??? alert(response);
});
结果：乱码

2.post方式

服务器端java代码：
request.setCharacterEncoding("UTF-8");??
String name = request.getParameter("name");

客户端js代码：
$.ajax({url: "3.jsp",type: "post",data: "method=testAjaxPost&name=中文",success: function(response){
??? alert(response);
}});
结果：正确显示

$.ajax({url: "3.jsp",type: "post",data: {name:"中文"},success: function(response){
??? alert(response);
}});
结果：正确显示

$.post("3.jsp", { name: "中文" },function(response){
??? alert(response);
});
结果：正确显示

$.post("3.jsp", "name=中文",function(response){
??? alert(response);
});
结果：正确显示

三、使用filter

public void doFilter(ServletRequest request, ServletResponse response,
??????? FilterChain chain) throws IOException, ServletException {
??? HttpServletRequest req = (HttpServletRequest) request;
??? if (req.getHeader("X-Requested-With") != null && req.getHeader("X-Requested-With").equalsIgnoreCase("XMLHttpRequest"))) {
??????? request.setCharacterEncoding("utf-8");
??? } else {
??????? request.setCharacterEncoding("gbk");
??? }
??? chain.doFilter(request, response);
}

jQuery在使用ajax的时候会在header中加入X-Requested-With，值为：XMLHttpRequest，filter中判断是jQuery的ajax请求时就把字符编码设为utf8，这样可以解决post提交中的中文乱码问题，不需要在代码中设置request.setCharacterEncoding("UTF-8");

对于get方式的中文乱码问题，建议不使用get方式提交中文，统统改为post ^-^

为了和prototype.js处理中文的方式一致，可以使用如下的方式，自定义header中的属性RequestType$.ajax({
??? url: "3.jsp",
??? type: "post",
??? data: {name:"中文"},
??? beforeSend: function(XMLHttpRequest){
??????? XMLHttpRequest.setRequestHeader("RequestType", "ajax");
??????? alert("开始");
??? },
??? success: function(data, textStatus){
??????? alert(data);
??? },
??? error: function(XMLHttpRequest, textStatus, errorThrown){
??????? alert("错误：" + textStatus);
??? },
??? complete: function(XMLHttpRequest, textStatus){
??????? alert("完成：" + textStatus);
??? }
?});filter代码如下：
public void doFilter(ServletRequest request, ServletResponse response,
??????? FilterChain chain) throws IOException, ServletException {
??? HttpServletRequest req = (HttpServletRequest) request;
??? if (req.getHeader("RequestType") != null && req.getHeader("RequestType").equalsIgnoreCase("ajax"))) {
??????? request.setCharacterEncoding("utf-8");
??? } else {
??????? request.setCharacterEncoding("gbk");
??? }
??? chain.doFilter(request, response);
}