两个服务之间的文件传递Java实现

在Java中，两个服务之间传递文件通常涉及到网络通信。常见的做法有通过HTTP、FTP、Socket等方式。这里我将以HTTP为例，展示一种简单的文件上传和下载方式：

1. **文件上传**：
使用`java.net.URLConnection`或第三方库如Apache HttpClient发送POST请求，包含文件内容。例如：

import java.io.FileInputStream;
import java.io.IOException;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public void uploadFile(String url, File file) throws IOException {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    MultipartEntityBuilder builder = MultipartEntityBuilder.create()
            .addBinaryBody("file", new FileInputStream(file), ContentType.APPLICATION_OCTET_STREAM, file.getName());
    HttpPost httpPost = new HttpPost(url);
    httpPost.setEntity(builder.build());
    HttpResponse response = httpClient.execute(httpPost);
    // 处理响应...
}

2. **文件下载**：
则发送GET请求获取文件内容，并保存到本地。例如：

import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;

public void downloadFile(String url, String outputPath) throws IOException {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpGet httpGet = new HttpGet(url);
    HttpResponse response = httpClient.execute(httpGet);
    try (FileOutputStream fos = new FileOutputStream(outputPath)) {
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = response.getEntity().getContent().read(buffer)) != -1) {
            fos.write(buffer, 0, bytesRead);
        }
    }
    // 关闭连接和实体...
}