WebSocket【B/S】前后端链接通信——simple_Chat实现(三)

一、前端实现登录页——css及script

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.login-container {
    width: 300px;
    padding: 40px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
input[type="text"], input[type="password"] {
    width: 93%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}
input[type="submit"] {
    width: 100%;
    padding: 10px;
    background-color: #5cb85c;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
input[type="submit"]:hover {
    background-color: #4cae4c;
}
#registId {
    float: right;
    font-size: 9px;
    color: blue;
}

       const url = 'http://127.0.0.1:8080';

        function logIn() {
            const name = document.getElementById("name").value;
            const password = document.getElementById("password").value;

            // 如果需要发起POST请求，并发送数据
            const postData = {
                name:name,
                password:password
            };

            fetch(url + "/login", {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(postData)
            })
                .then(response => response.json())
                .then(result => {
                    if (result.errCode == 200) {
                        const data = result.data;
                        console.log('data:', data);
                        console.log(encodeURIComponent(data));
                        window.location.href = url + "/chat?user=" + encodeURIComponent(JSON.stringify(data));

                        return;
                    } else {
                        //console.log('error:', result);
                        alert(result.errCode+":" + result.msg);
                    }
                })
                .catch(error => {
                    console.error('Fetch error:', error);
                });
        }

二、前端实现注册页——css及script

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.login-container {
    width: 300px;
    padding: 40px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
/*#name::placeholder {*/
/*    color: red;*/
/*}*/
input[type="text"], input[type="password"] {
    width: 93%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}
input[type="submit"] {
    width: 100%;
    padding: 10px;
    background-color: #5cb85c;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
input[type="submit"]:hover {
    background-color: #4cae4c;
}
#registId {
    float: right;
    font-size: 9px;
    color: blue;
}

/**弹窗**/
/* 模态背景 */
.modal {
    display: none; /* 默认隐藏 */
    position: fixed; /* 固定位置 */
    z-index: 1; /* 位于顶层 */
    left: 0;
    top: 0;
    width: 100%; /* 全屏宽度 */
    height: 100%; /* 全屏高度 */
    overflow: auto; /* 超出时滚动 */
    background-color: rgb(0,0,0); /* 背景颜色 */
    background-color: rgba(0,0,0,0.4); /* 背景颜色 w/ 透明度 */
}

/* 模态内容 */
.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fefefe;
    padding: 20px;
    border: 1px solid #888;
    width: 34%;
}

/* 关闭按钮 */
.close {
    color: #aaa;
    float: right;
    font-size: 23px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

       // 假设后端服务的URL是 http://localhost:8080/api/data
        const url = 'http://127.0.0.1:8080';

 /*       // 发起GET请求
        fetch(url + "/register")
            .then(response => {
                if (response.ok) {
                    return response.json(); // 如果后端返回的是JSON数据
                }
                throw new Error('Network response was not ok.');
            })
            .then(data => {
                console.log('Received data:', data);
            })
            .catch(error => {
                console.error('Fetch error:', error);
            });*/

        function regist() {
            const value = registCheck();
            if (value != 1) {
                return;
            }

            const name = document.getElementById("name").value;
            const password = document.getElementById("password").value;
            const passwordEnter = document.getElementById("passwordEnter");
            if (password != passwordEnter.value) {
                passwordEnter.placeholder = "俩次密码输入不一致，请重新输入!!!";
                return;
            }

            // 如果需要发起POST请求，并发送数据
            const postData = {
                name:name,
                password:password
            };

            fetch(url + "/register", {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(postData)
            })
                .then(response => response.json())
                .then(data => {
                    console.log('Received data:', data);
                    showAlert();
                })
                .catch(error => {
                    console.error('Fetch error:', error);
                });
        }

        function checkNull(event) {
            const input = event.target;
            if (!input.value) {
                // 输入内容为空
                input.placeholder = '输入数据不能为空!!!';
                // 重设焦点
                const name = document.getElementById("name");
                if (name.value == '') {
                    name.focus();
                    return;
                }
                input.focus();
            }
        }

        // 注册数据校验
        function registCheck() {
            const name = document.getElementById("name");
            if (name.value == '') {
                name.placeholder = '输入数据不能为空!!!';
                name.focus();
                return 0;
            }

            const password = document.getElementById("password");
            if (password.value == '') {
                password.placeholder = '输入数据不能为空!!!';
                password.focus();
                return 0;
            }

            return 1;
        }

        /**弹窗**/
        function showAlert() {
            // 获取模态窗口
            const modal = document.getElementById('modal');
            modal.style.display = "block";

            // 获取 <span> 元素，用于关闭模态窗口
            const span = document.getElementsByClassName("close")[0];
            // 当用户点击span元素或点击模态窗口的其他地方时关闭模态窗口
            span.onclick = function() {
                modal.style.display = "none";
            }
            // 当用户点击任何地方时检查，如果点击的是模态内容则不关闭窗口
            window.onclick = function(event) {
                if (event.target == modal) {
                    modal.style.display = "none";
                }
                window.location.href = "index.html";
            }
        }

三、前端实现聊天页——css及script

.container {
            grid-template-columns: repeat(3, 1fr); /* 每列宽度相等 */
            grid-template-columns: repeat(2, 1fr); /*俩列*/
            grid-gap: 10px; /* 格子间隔 */
            width: 330px;
            /*
            height: 100px;
            */
            display: flex;
            flex-direction: column;
            /*margin: 0 auto; 水平居中*/
            margin-left: 20%;
            margin-top: 3%;
        }

        .column {
            background-color: white; /* 格子背景色 */
            border: 0px solid #ccc; /* 格子边框 */
            align-items: center;
            font-size: 18px;
            padding: 0.1px; /* 格子内部填充 */
        }

    /*    #chat_id {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 90vh; !* 使div的高度为视口高度，可根据需要调整 *!
        }*/

        .container {
            font-size: 16px;
        }
        input[type="text"] {
            vertical-align: top; /* 或者使用 middle 或 bottom */
            padding: 5px;
            margin: 0;
            border: 1px solid #ccc;
        }

        #sendId {
            float: right;
        }
        #message {
            width: 200px;
            height: 150px;
        }

    // 页面入参
    const searchParams = new URLSearchParams(window.location.search);
    const user = JSON.parse(decodeURIComponent(searchParams.get('user')));
    //console.log('user:',user);

    // 获取currentUser元素
    const currentUserName = document.getElementById("currentUser");
    // 给span元素设置新的内容
    currentUserName.innerHTML = user.name;

    // webSocket链接
    var ws

    /**
     * 链接websocket
     */
    function connection() {
        const userId = user.id;
        ws = new WebSocket('ws://127.0.0.1:8080/sanqi_server/' + userId);

        ws.onopen = function(evt) {
            const currentUser = user.name;

            // 确保不在关闭状态中发送
            if (ws.readyState === WebSocket.OPEN) {
                console.log("Connection open ...");
                // 连接建立后可以在这里发送消息
                ws.send(JSON.stringify({ 'currentUser': currentUser,'sendFlag':'0','sendTo':userId}));
            } else {
                console.error('WebSocket is not open:', ws.readyState);
            }
        };

        ws.onmessage = function(evt) {
            console.log( "Received Message: " + evt.data);
            document.getElementById('output').innerHTML += "<p>" + evt.data + "</p>";
        };

        ws.onclose = function(evt) {
            console.log("Connection closed.");
        };
    }

    function sendMessage() {
        console.log("发送消息");
        const currentUser = user.name;
        const sendTo = user.id;
        const message = document.getElementById('sendMsg').value;
        ws.send(JSON.stringify({ 'currentUser': currentUser,'sendFlag':'2','sendTo':sendTo,'sendMsg': message }));
}

打包应用程序下载地址：https://download.youkuaiyun.com/download/u011154842/90167214
本文上续【WebSocket【B/S】前后端链接通信——simple_Chat实现(二)】，旨在补全其中的css和script，后端实现详情待后续更新！！！