Java字节流：文件读写、HTTP请求解析案例

原创淩亂°似流年 2024-10-10 11:45 27阅读 0赞

在Java中，我们可以使用`java.io`包中的类来处理字节流，包括文件读写和HTTP请求的解析等。以下是这两个方面的具体案例：

1. 文件读写

```java
import java.io.*;

// 读取文件
File file = new File("path_to_your_file.txt");
try (BufferedReader br = new BufferedReader(new FileReader(file)))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
}
catch (IOException e) {
    e.printStackTrace();
}

// 写入文件
String contentToWrite = "This is the content to be written.";
try (PrintWriter writer = new PrintWriter(new FileWriter(file)))) {
    writer.println(contentToWrite);
} catch (IOException e) {
    e.printStackTrace();
}
```

2. HTTP请求解析

在Java中，我们可以使用`java.net.http.HttpURLConnection`来发送HTTP请求并接收响应。以下是一个简单的例子：

```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpRequestParser {
    public static void main(String[] args) throws Exception {
        // 创建URL对象
        URL url = new URL("http://example.com/api/data");

// 使用HttpURLConnection发送请求
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");  // GET方式请求数据

// 如果连接成功，获取响应码和实体数据
        int responseCode = conn.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream())));

String inputLine;
            StringBuilder contentBuilder = new StringBuilder();

while ((inputLine = in.readLine()) != null)) {
                contentBuilder.append(inputLine);
            }

// 处理实体数据
            System.out.println("Response Content: " + contentBuilder.toString());
        } else {
            System.out.println("Failed to connect. Response Code: " + responseCode);
        }
        conn.disconnect();  // 关闭连接
    }
}
```

以上两个例子分别展示了Java文件读写和HTTP请求解析的基本操作。