用户：<input type="text" name="uname" id="username"><br>
密码：<input type="text" name="pw" id="password"><br>
<input type="button" name="button" value="get确定" onclick="test();"/>
<input type="button" name="button" value="post确定" onclick="testp();">
<div id="result">
</div>
</center>
</body>
</html>
这里是servlet/action Java代码:
package com.cstp.javascript;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class AjaxServlet1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
//设置编码，防止乱码
response.setCharacterEncoding("utf-8");
request.setCharacterEncoding("utf-8");
//接收参数
String msg=request.getParameter("msg");
if(msg.equals("gets")){
// String name=new String(request.getParameter("name").getBytes("ISO8859-1"), "UTF-8"); //一次编码，java里进行解码操作
String name=java.net.URLDecoder.decode(request.getParameter("name"),"utf-8"); //decode解码页面必须两次编码，java里进行解码操作
String pwd=request.getParameter("pwd");
System.out.println(name+","+pwd);
PrintWriter out = response.getWriter();
out.println("ajax响应get，结果返回"+name+","+pwd);
}else if(msg.equals("posts")){
String name=new String(request.getParameter("name").getBytes("utf-8"), "UTF-8"); //一次编码，java里进行解码操作
String pwd=request.getParameter("pwd");
System.out.println(name+","+pwd);
PrintWriter out = response.getWriter();
out.println("ajax响应post，结果返回"+name+","+pwd);
}
}
}
上面是javascript版ajax，下面将喜欢jquery版的也分享给JQ友们：
页面上：
<script type="text/javascript">
//方式①
function circum(lon,lat){
$.ajax({
url: "JQAjaxServlet?method=jsons",
contentType: "application/x-www-form-urlencoded; charset=utf-8",
type : 'post',
dataType:"json",
async: false,
data : { //传参给后台
'lon' : lon,
'lat' : lat
},
success: function (data) { // 接后台返回result
在这里data为后台返回数据，你可以尽情处理了
}
});
}
</script>
后台：servlet/action里
类里对数据处理的方法同上，就不再累赘了
