留言板小练习-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_73740682/article/details/139662258

在这里插入图片描述

相关代码

前端代码

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

        .grey {
            color: grey;
        }

        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .container .row input {
            width: 260px;
            height: 30px;
        }

        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>

<body>
<div class="container">
    <h1>留言板</h1>
    <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
    <div class="row">
        <span>谁:</span> <input type="text" name="" id="from">
    </div>
    <div class="row">
        <span>对谁:</span> <input type="text" name="" id="to">
    </div>
    <div class="row">
        <span>说什么:</span> <input type="text" name="" id="say">
    </div>
    <input type="button" value="提交" id="submit" onclick="submit()">
    <!-- <div>A 对 B 说: hello</div> -->
</div>

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
<script>
    //页面加载时,请求后端,获取留言列表
    $.ajax({
        url: "/message/getMessageInfo",
        type: "get",
        success: function (messages) {
            for(let message of messages){
                // 拼接显示的记录了
                //2.拼接节点的html
                let divE = "<div>" + message.from + "对" + message.to + "说:" + message.message + "</div>"
                //3.把节点添加到页面上
                $(".container").append(divE);
            }
        }
    })

    function submit() {
        //1.获取留言的内容
        let from = $("#from").val();
        let to = $("#to").val();
        let say = $("#say").val();
        // 不为空
        if (from == "" || to == "" || say == "") {
            return;
        }
        //提交留言
        $.ajax({
            url: "/message/publish",
            type: "post",
            data: {
                "from": from,
                "to": to,
                "message": say
            },
            success: function (result) {
                if (result) {
                    //添加成功
                    //2.拼接节点的html
                    let message = "<div>" + from + "对" + to + "说:" + say + "</div>"
                    //3.把节点添加到页面上
                    $(".container").append(message);
                    //4.清空输入框的值
                    $("#from").val("");
                    $("#to").val("");
                    $("#say").val("");
                } else {
                    //添加失败
                    alert("留言发布失败")
                }
            }
        });


    }

</script>
</body>

</html>

后端代码

package org.example.demo.controller;

import org.apache.catalina.util.StringUtil;
import org.apache.logging.log4j.message.Message;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: fly - 逐梦者
 * Date: 2024-06-12
 * Time: 19:46
 */
@RequestMapping("/message")
@RestController
public class MessageController {
    private List<MessageInfo> messageInfos = new ArrayList<>();
    @RequestMapping("/publish")
    public Boolean publishMessage(MessageInfo messageInfo) {
        String  from = messageInfo.getFrom();
        //进行参数的校验
        if(!StringUtils.hasLength(messageInfo.getFrom())
                || !StringUtils.hasLength(messageInfo.getTo())
                || !StringUtils.hasLength(messageInfo.getMessage())){
            return false;
        }
        // 添加留言
        messageInfos.add(messageInfo);
        return true;
    }
    @RequestMapping("/getMessageInfo")
    public List<MessageInfo> getMessageInfo() {
        return  messageInfos;
    }
}

package org.example.demo.controller;

import lombok.Data;
import lombok.Getter;
import lombok.Setter;

import java.util.Date;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: fly - 逐梦者
 * Date: 2024-06-12
 * Time: 19:55
 */
@Data
public class MessageInfo {
//    @Getter @Setter
    private String from;
//    @Getter @Setter
    private String to;
    private String message;
//    private Date CreateTime;
}