The last packet successfully received from the server was 38 milliseconds ago

时间: 2024-04-21 07:21:48 浏览: 97

服务器接收

### 服务器接收：Android客户端向Web应用程序发送消息在现代移动应用开发中，客户端与服务器之间的数据交互至关重要。本文将详细介绍如何实现Android客户端向服务器端发送消息的过程，并深入探讨其中涉及的关键技术点。 #### 一、理解服务器挂起概念在进行客户端与服务器的数据通信时，“服务器挂起”是一个常见的问题。“服务器挂起”通常指的是服务器在接受客户端连接请求后，因为某些原因（如资源不足、逻辑错误等）而长时间没有响应，导致客户端处于等待状态。这会严重影响用户体验和系统的整体性能。为了有效避免“服务器挂起”的情况发生，在设计服务器端逻辑时需要注意以下几点： 1. **资源管理**：确保服务器有足够的资源处理并发连接。 2. **异常处理**：正确处理各种异常情况，避免因异常而导致的服务中断。 3. **超时设置**：合理设置连接和读写操作的超时时间，避免无休止的等待。 #### 二、客户端发送数据流程在本案例中，Android客户端通过HTTP POST方式向服务器发送数据。下面详细解析这段代码： 1. **创建URL对象**： ```java URL url = new URL("http://xxxxx:8080/目标Action"); ``` 这里指定了服务器的地址以及需要调用的Action或服务。 2. **建立连接**： ```java HttpURLConnection conn = (HttpURLConnection) url.openConnection(); ``` 使用`HttpURLConnection`类打开与指定URL的连接。 3. **设置请求属性**： - 设置Content-Type为"text/xml"，表明发送的数据格式为XML。 - `setDoOutput(true)`表示该连接可以通过输出流发送数据给服务器。 - `setDoInput(true)`表示该连接可以通过输入流从服务器接收数据。 - `setRequestMethod("POST")`设置请求方法为POST。 4. **发送数据**： ```java BufferedWriter out = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream(), "UTF-8")); out.write("我的消息"); out.flush(); out.close(); ``` 将待发送的消息编码为UTF-8格式，通过输出流发送到服务器。 5. **接收服务器响应**： ```java InputStream is = conn.getInputStream(); System.out.println(is.available()); ``` 通过输入流获取服务器返回的数据。 #### 三、服务器端处理数据接下来，我们看看服务器端如何处理这些数据： 1. **设置响应类型**： ```java response.setContentType("text/xml;charset=UTF-8"); ``` 设置响应的数据格式和字符集。 2. **读取客户端发送的数据**： ```java BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream) request.getInputStream())); String line = null; StringBuilder sb = new StringBuilder(); while ((line = br.readLine()) != null) { sb.append(line); } System.out.println("接收到sb=" + URLEncoder.encode(sb.toString(), "UTF-8")); ``` 使用`BufferedReader`逐行读取客户端发送的数据，并拼接到`StringBuilder`对象中。对读取的数据进行编码并打印。 #### 四、总结通过以上分析可以看出，实现Android客户端与服务器之间的数据交互涉及到多个步骤和技术点，包括但不限于网络连接的建立、数据格式的选择、数据的发送与接收等。开发者需要熟悉这些技术和流程，并注意优化性能，确保系统的稳定性和高效性。此外，合理的异常处理机制也是必不可少的，它能够有效避免服务器出现挂起等问题，提高用户体验。

"The last packet successfully received from the server was 38 milliseconds ago"这句话的意思是距离上一次成功接收服务器数据包已经过去了38毫秒。这个信息通常用于网络连接的监测和性能评估。通过检测数据包的接收时间，可以判断网络连接的稳定性和延迟情况。相关问题: 1. 为什么要监测服务器数据包的接收时间？ 2. 如何评估网络连接的稳定性？ 3. 什么是网络延迟？如何影响网络性能？

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The last packet successfully received from the server was 38 milliseconds ago

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## @[Android studio通过jdbc连接mysql基本步骤以及遇到的坑“The last packet sent successfully to the server was 0 m