JQuery .Ajax 详解中文问题

jQuery ajax乱码问题解决

一、测试环境
jQuery:1.3.2
tomcat:5.5.17

二、测试方法

1.使用get方式

服务器端代码：
String name = new String(request.getParameter("name").getBytes("iso8859-1"),"utf-8");

客户端js代码：
<1>$.ajax({url: "2.jsp",type: "get",data: {name:"中文"},success: function(response){
        alert(response);
        }});
           结果：正确显示

<2>$.ajax({url: "2.jsp",type: "get",data: "name=中文",success: function(response){
        alert(response);
      }});
           结果：乱码

<3>$.get("2.jsp", { name: "中文" },function(response){
    alert(response);
      });
           结果：正确显示

<4>$.get("2.jsp", "name=中文",function(response){
    alert(response);
    });
     结果：乱码

2.post方式

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

客户端js代码：
<1>$.ajax({url: "3.jsp",type: "post",data: "method=testAjaxPost&name=中文",success: function(response){
    alert(response);
     }});
     结果：正确显示

<2>$.ajax({url: "3.jsp",type: "post",data: {name:"中文"},success: function(response){
    alert(response);
     }});
     结果：正确显示

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

<4>$.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);
}