Java中IO流操作：文件读写，网络通信等问题实例展示-蒲公英云

Java中IO流操作：文件读写，网络通信等问题实例展示

在Java中，IO流是处理输入和输出数据的关键部分。以下是一些常见的IO流操作实例：

文件读写：
```java
import java.io.*;

// 读取文件内容
File file = new File(“path_to_your_file.txt”);
BufferedReader br = new BufferedReader(new FileReader(file));
String content = “”;
while ((content = br.readLine()) != null) {
System.out.println(content);
}
br.close();

// 写入文件
String dataToWrite = “Hello, World!”;
FileOutputSteam fos = new FileOutputStream(“new_file.txt”);
fos.write(dataToWrite.getBytes());
fos.close();


2. 网络通信：
```java
import java.io.*;
import java.net.*;
// 发送HTTP请求
public class SendHTTPRequest {
    public static void main(String[] args) throws IOException {
        URL url = new URL("http://example.com");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        // 设置请求方法
        connection.setRequestMethod("GET");
        // 获取响应码
        int responseCode = connection.getResponseCode();
        System.out.println("Response Code: " + responseCode);
        if (responseCode == 200) { // 如果状态码为200（成功），则读取响应内容
            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()))); 
            String responseContent = "";
            while ((responseContent = br.readLine()) != null) {
                System.out.println(responseContent);
            }
            br.close();
        }
        connection.disconnect(); // 关闭连接
    }
}