Java GET 请求解决中文乱码问题

在 Java 中，使用 HttpURLConnection 或 HttpClient 发送 GET 请求时，需要设置字符编码为 UTF-8 来避免中文乱码问题。以下是一个示例代码：

使用 HttpURLConnection：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {

    public static void main(String[] args) {
        try {
            URL url = new URL('http://example.com');
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod('GET');
            connection.setRequestProperty('Accept-Charset', 'UTF-8');
            connection.connect();

            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, 'UTF-8'));
                String line;
                StringBuilder response = new StringBuilder();
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                reader.close();
                System.out.println(response.toString());
            }

            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用 HttpClient：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class Main {

    public static void main(String[] args) {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet httpGet = new HttpGet('http://example.com');
        httpGet.setHeader('Accept-Charset', 'UTF-8');
        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            String responseString = EntityUtils.toString(entity, 'UTF-8');
            System.out.println(responseString);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

通过设置请求头和读取数据时的字符编码为 UTF-8，可以确保获取的数据以 UTF-8 编码解析，避免中文乱码问题。