一、完整代码展示

• 目前大多数的ai对话都是流式输出，也就是对话是一个字或者多个字逐一进行显示的
• 下面是一个完整的流式显示程序，包含的用户的消息发出和ai的消息回复

<template><view class="chat-container"><view class="messages"><!-- 对话气泡 --><viewv-for="(message, index) in messages":key="index":class="['message', message.sender]"><text selectable="true">{{ message.text }}</text></view><!-- 加载状态 --><view v-if="isLoading" class="loading-spinner"></view></view><!-- 消息输入和发送按钮 --><view class="input-area"><textareav-model="inputMessage"placeholder="输入消息"@input="adjustInputHeight"></textarea><button @click="sendMessage">发送</button></view></view>
</template><script>
export default {data() {return {messages: [],inputMessage: '',isLoading: false,inputHeight: 48};},methods: {sendMessage() {//如果输出消息为空直接返回if (!this.inputMessage.trim()) return;// 添加用户消息this.messages.push({text: this.inputMessage,sender: 'user'});// 初始化AI消息const aiIndex = this.messages.length;this.messages.push({text: '',sender: 'ai'});// 重置输入this.inputMessage = '';this.isLoading = true;// 发起流式请求const url = 'http://localhost:8081/chat';const params = {session_id: 'token',content: this.inputMessage};uni.request({url: url + '?' + this.serializeParams(params),method: 'GET',header: {'Accept': 'text/event-stream',},success: (res) => {this.processStreamResponse(res.data, aiIndex);},fail: (err) => {console.error('请求失败:', err);this.isLoading = false;}});},processStreamResponse(data, aiIndex) {const chunks = data.split('\n');let chunkIndex = 0;const interval = setInterval(() => {if (chunkIndex >= chunks.length) {clearInterval(interval);this.isLoading = false;return;}const chunk = chunks[chunkIndex].replace('data:', '').trim();if (chunk) {this.messages[aiIndex].text += chunk;this.$forceUpdate();}chunkIndex++;}, 50);},serializeParams(params) {return Object.entries(params).map(([key, value]) => `${encodeURIComponent(key)}=${encodeURIComponent(value)}`).join('&');},adjustInputHeight(e) {const textarea = e.target;textarea.style.height = 'auto';textarea.style.height = textarea.scrollHeight + 'px';this.inputHeight = textarea.scrollHeight;}}
};
</script><style>
.chat-container {height: 100vh;display: flex;flex-direction: column;padding: 20px;background-color: #f5f5f7;
}.messages {flex: 1;overflow-y: auto;padding: 20px;
}.message {margin: 10px 0;padding: 12px 16px;border-radius: 16px;max-width: 70%;word-wrap: break-word;
}.message.user {background: linear-gradient(135deg, #cbe7ff, #cfe9ff);align-self: flex-end;
}.message.ai {background: linear-gradient(135deg, #f0f0f0, #e0e0e0);align-self: flex-start;
}.loading-spinner {border: 4px solid #f3f3f3;border-top: 4px solid #007aff;border-radius: 50%;width: 24px;height: 24px;animation: spin 1s linear infinite;margin: 20px auto;
}.input-area {display: flex;gap: 10px;margin-top: 20px;
}textarea {flex: 1;padding: 12px;border: 1px solid #ddd;border-radius: 8px;resize: none;
}button {padding: 12px 24px;background-color: #007aff;color: white;border: none;border-radius: 8px;cursor: pointer;
}@keyframes spin {0% { transform: rotate(0deg); }100% { transform: rotate(360deg); }
}
</style>

二、流式传输核心代码讲解

1、请求发起

• 设置Accept: text/event-stream告知服务器需要流式响应
• 通过session_id传递认证信息
• 使用GET请求发送消息内容

uni.request({url: url + '?' + this.serializeParams(params),method: 'GET',header: {'Accept': 'text/event-stream',},success: (res) => {this.processStreamResponse(res.data, aiIndex);}
});

2、流式响应处理

• 将响应数据按换行符分割成块
• 使用setInterval控制显示速度（这里设置为 50ms / 块）
• 逐块追加到 AI 消息中
• 使用$forceUpdate强制刷新视图

processStreamResponse(data, aiIndex) {const chunks = data.split('\n');let chunkIndex = 0;const interval = setInterval(() => {if (chunkIndex >= chunks.length) {clearInterval(interval);this.isLoading = false;return;}const chunk = chunks[chunkIndex].replace('data:', '').trim();if (chunk) {this.messages[aiIndex].text += chunk;this.$forceUpdate();}chunkIndex++;}, 50);
}

3、加载状态管理

• 在请求发起时显示加载状态
• 响应处理完成后隐藏加载状态

// 发送消息时
this.isLoading = true;// 响应处理完成
clearInterval(interval);
this.isLoading = false;

4、数据格式处理 

• 将参数对象序列化为 URL 查询字符串
• 使用encodeURIComponent处理特殊字符

serializeParams(params) {return Object.entries(params).map(([key, value]) => `${encodeURIComponent(key)}=${encodeURIComponent(value)}`).join('&');
}

5、消息显示 

• 使用 flex 布局实现消息气泡
• 通过selectable="true"实现文本选中
• 根据 sender 添加不同样式

<view v-for="(message, index) in messages" :class="['message', message.sender]"><text selectable="true">{{ message.text }}</text>
</view>