ajax-axios发送 get请求 或者 发送post请求带有请求体参数

/* axios v0.21.1 | (c) 2020 by Matt Zabriskie */
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//# sourceMappingURL=axios.min.map

 1、发送get请求

package com.csdn.servlet;
import jakarta.servlet.GenericServlet;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.annotation.WebServlet;
import java.io.IOException;
import java.io.PrintWriter;
//演示Ajax
@WebServlet("/h09")
public class AjaxServlet extends GenericServlet {@Overridepublic void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {String uname = servletRequest.getParameter("uname");uname = uname.toUpperCase();PrintWriter out = servletResponse.getWriter();out.println(uname);out.flush();}
}

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>ajax02</title><script src="script/axios.min.js"></script><script>//let xmlHttpRequest;function sendAjax01() {let uname = document.getElementById("uname").value;axios({method: "Get",url: "h09",params: {     //params:请求参数uname: uname}}).then(function (response) {let msg = response.data;document.getElementById("uname2").innerText = msg;});
/*xmlHttpRequest = new XMLHttpRequest();xmlHttpRequest.open("Get","h09?uname="+uname,true);//Get：请求方式    h09:请求的目的地   true：异步请求//onreadystatechange:当状态发生改变的时候调用sendAjax01CB//状态取值有 0-4 ，共 5 个，我们感兴趣的是 4//0 表示 xmlHttpRequest未创建//1 表示开始发送请求//2 表示发送请求完成//3 表示开始接收响应//4 表示接收响应成功，客户端成功解析服务器返回的响应xmlHttpRequest.onreadystatechange = sendAjax01CB;    //CB:call back 回调函数//发送请求xmlHttpRequest.send();}function sendAjax01CB() {if (xmlHttpRequest.readyState == 4 && xmlHttpRequest.status == 200) {//获取响应文本let msg = xmlHttpRequest.responseText;document.getElementById("uname2").innerText = msg;}
*/}</script>
</head>
<body>uname:<input type="text" id="uname"/><input type="button" value="发生异步请求" onclick="sendAjax01()"><br/>服务器响应回来的内容：<span id="uname2">&nbsp</span>
</body>
</html>

2、发送post请求 

package com.csdn.servlet;
import com.google.gson.Gson;
import jakarta.servlet.GenericServlet;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.annotation.WebServlet;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
//演示Ajax
@WebServlet("/h10")
public class PostAxiosAjaxServlet extends GenericServlet {@Overridepublic void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {BufferedReader br = servletRequest.getReader();StringBuilder stringBuilder = new StringBuilder();String str = null;if ((str= br.readLine())!=null) {stringBuilder.append(str);}str = stringBuilder.toString();System.out.println(str);Gson gson = new Gson();//已知json字符串，获取Java对象Person person = gson.fromJson(str, Person.class);/*String uname = servletRequest.getParameter("uname");uname = uname.toUpperCase();String address = servletRequest.getParameter("address");address = address.toUpperCase();
*/PrintWriter out = servletResponse.getWriter();out.println(person);out.flush();}
}
@Data
@NoArgsConstructor
@AllArgsConstructor
class Person{private String uname;private String address;
}

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>ajax03</title><script src="script/axios.min.js"></script><script>//let xmlHttpRequest;function sendAjax01() {let uname = document.getElementById("uname").value;let address = document.getElementById("address").value;axios({method: "POST",url: "h10",data: {  //data:请求体参数   发送请求体参数必须是post请求uname: uname,address:address}}).then(function (response) {let msg = response.data;document.getElementById("uname2").innerText = msg;});
/*xmlHttpRequest = new XMLHttpRequest();xmlHttpRequest.open("Get","h09?uname="+uname,true);//Get：请求方式    h09:请求的目的地   true：异步请求//onreadystatechange:当状态发生改变的时候调用sendAjax01CB//状态取值有 0-4 ，共 5 个，我们感兴趣的是 4//0 表示 xmlHttpRequest未创建//1 表示开始发送请求//2 表示发送请求完成//3 表示开始接收响应//4 表示接收响应成功，客户端成功解析服务器返回的响应xmlHttpRequest.onreadystatechange = sendAjax01CB;    //CB:call back 回调函数//发送请求xmlHttpRequest.send();}function sendAjax01CB() {if (xmlHttpRequest.readyState == 4 && xmlHttpRequest.status == 200) {//获取响应文本let msg = xmlHttpRequest.responseText;document.getElementById("uname2").innerText = msg;}
*/}</script>
</head>
<body>uname:<input type="text" id="uname"/><br/>address:<input type="text" id="address"><br/><input type="button" value="发生异步请求" onclick="sendAjax01()"><br/>服务器响应回来的内容：<span id="uname2">&nbsp</span>
</body>
</html>