easyui ajax方式与后台servlet交互原理
easyui ajax是以json数据方式来与后台进行交互的。
阮一峰有篇博客对json数据格式总结的非常好：
http://www.ruanyifeng.com/blog/2009/05/data_types_and_json.html
工程要用到easyui的jar包，可以在我的资源里下载，免费的。
http://download.csdn.net/detail/shfqbluestone/5759579
前端index.jsp的代码：
<%@ page language="java" pageEncoding="UTF-8"%>配置文件web.xml:
<%
String path = request.getContextPath();
%>
<html>
<head>
<title></title>
<script type="text/javascript" src="<%=path%>/js/jquery-easyui-1.3.2/jquery-1.8.0.min.js" ></script>
<script type="text/javascript" src="<%=path%>/js/jquery-easyui-1.3.2/jquery.easyui.min.js"></script>
<script type="text/javascript">
function loginIt(){
var params = $('#LoginForm').serialize(); //序列化表单的值
alert("params:" + params);
$.ajax({
type: "post",
url: "MyServlet",
dataType: "json",
data: params,
success: function(data){
alert(data.code);
}
});
}
</script>
</head>
<body>
<form name="LoginForm" id="LoginForm" action="" method="post">
<div class="bdyy">
用户名： <input type="text" name="username" id="username" />
</div>
<div class="bdyy">
登录密码： <input type="password" name="password" id="password" />
<div class="bu_d">
<input type="button" name="button" id="button" onclick="loginIt();" value="提交"/>
</div>
</form>
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>s2sh</display-name>
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>
MyServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/MyServlet</url-pattern>
</servlet-mapping>
</web-app>
后台servlet MyServlet类的代码：
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException {
response.setContentType("text/html;charset=gbk");
Map map = request.getParameterMap();
String[] names = (String[])map.get("username");
String[] passwords = (String[])map.get("password");
System.out.println(names[0]);
System.out.println(passwords[0]);
String username = request.getParameter("username");
System.out.println(username);
response.setContentType("application/x-json");// 需要设置ContentType为"application/x-json"
try {
PrintWriter out = response.getWriter();
String json = "{\"city\" : \"Beijing\", \"code\" : \"010\"}";
out.println(json);// 向客户端输出JSONObject字符串
out.flush();
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException {
this.doGet(request, response);
}
public void init() throws ServletException {
}
}
工程结构图：
