在Eclipse中要实现前后台交互需要两个文件,一个HTML文件,另一个是servlet文件。
html文件代码如下所示:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>first</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>
姓名:<input type="text" id="username"/><br/>
密码:<input type="text" id="password"/><br/>
<input type="button" value="提交" onclick="get()"/><br/>
</body>
<script>
function get(){
//获取用户的数据
var username=$("#username").val();//¥(#name)是为了获取提交的姓名框,val是为了获取数据
var password=$("#password").val();
$.ajax({
type:"get",//决定向后台servlet提交所使用的方法
url:"http://localhost:8080/JinRong/FirstServlet",
data:{"username":username,"password":password},//提交数据
success:function(data){//获取成功返回数据
console.log(data);//返回前台成功后的消息给后台
}
})
}
</script>
</html>
servlet文件代码如下所示:
package com.jinrong;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class FirstServlet
*/
@WebServlet("/FirstServlet")
public class FirstServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FirstServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username + " " + password);
String json="{\"code\":\"200\",\"message\":\"成功\"}";
response.getWriter().append(json);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
运行后的前台提交数据会在后台显示,成功后会给前台返回json格式的信息。
如果后台返回前台的信息出现乱码 ,代表上方字符集不一致,需要在servlet文件中添加如下代码即可,添加在定义{“code”:”200″,”message”:”成功”}代码的上方即可。
//设定字符集,防止前后交互出现乱码
response.setContentType("text/json;charset=utf-8");
response.setCharacterEncoding("utf-8");
如果后台需要返回前台的message信息,只需要在html文件中的ajax的function(data)中添加如下代码即可。
console.log(data.message);
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