服务器文件传输

package com.example.demo02.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.*;

@RestController
public class FileController {
    @RequestMapping(value = "/getCommonFile", method = RequestMethod.POST)
    public void getFile(HttpServletResponse response) {
        BufferedInputStream buffInputStream = null;
        OutputStream outputStream = null;
        try {
            String filePath = "E:\\ideaprojectTestFile\\excel.zip";
            buffInputStream = new BufferedInputStream(new FileInputStream(new File(filePath)));
            outputStream = response.getOutputStream();
            byte[] buff = new byte[1024 * 1024]; //如果是稍微大的文件，这里配置的大一些
            int len = 0;
            while ((len = buffInputStream.read(buff)) > 0) {
                //把文件流写入到response的输出流中，供请求端请求
                outputStream.write(buff, 0, len);
                outputStream.flush();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (buffInputStream != null) {
                    buffInputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @RequestMapping(value = "/getZipFile", method = RequestMethod.POST)
    public void getZipFile(HttpServletResponse response) {
        BufferedInputStream buffInputStream = null;
        OutputStream outputStream = null;
        try {
            String filePath = "D:\\testFile\\test.gz";
            buffInputStream = new BufferedInputStream(new FileInputStream(new File(filePath)));
            outputStream = response.getOutputStream();
            byte[] buff = new byte[1024 * 1024]; //如果是稍微大的文件，这里配置的大一些
            int len = 0;
            while ((len = buffInputStream.read(buff)) > 0) {
                //把文件流写入到response的输出流中，供请求端请求
                outputStream.write(buff, 0, len);
                outputStream.flush();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (buffInputStream != null) {
                    buffInputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

package com.example.demo01.file;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;

import java.io.*;

public class GetFile {
    public static void main(String[] args) {
        try {
            getCommonFile2();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void getCommonFile2() throws IOException {
        //从服务器请求文件流，具体代码就不贴了
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost("http://localhost:9000/getCommonFile");
        CloseableHttpResponse response = httpClient.execute(httpPost);
        InputStream inputStream = response.getEntity().getContent();

        File outputFile = new File("E:\\ideaprojectTestFile\\excelCopy.zip");
        OutputStream outputStream = new FileOutputStream(outputFile);
        byte[] buff = new byte[1024]; //如果是稍微大的文件，这里配置的大一些
        int len = 0;
        while ((len = inputStream.read(buff)) > 0) {
            //把从服务端读取的文件流保存到ByteArrayOutputSteam中
            outputStream.write(buff, 0, len);
            outputStream.flush();
        }
        inputStream.close();
        response.close();
        outputStream.close();

//        BufferedReader bufferedReader = new BufferedReader(
//                new InputStreamReader(new ByteArrayInputStream(byteArray.toByteArray()), "utf-8"));
//        String line = null;
//        while ((line = bufferedReader.readLine()) != null) {
//            System.out.println(line);
//        }

    }

    public static void getCommonFile() throws IOException {
        //从服务器请求文件流，具体代码就不贴了
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost("http://localhost:9000/getCommonFile");
        CloseableHttpResponse response = httpClient.execute(httpPost);
        InputStream inputStream = response.getEntity().getContent();
        ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
        byte[] buff = new byte[1024]; //如果是稍微大的文件，这里配置的大一些
        int len = 0;
        while ((len = inputStream.read(buff)) > 0) {
            //把从服务端读取的文件流保存到ByteArrayOutputSteam中
            byteArray.write(buff, 0, len);
            byteArray.flush();
        }
        inputStream.close();
        response.close();

//        BufferedReader bufferedReader = new BufferedReader(
//                new InputStreamReader(new ByteArrayInputStream(byteArray.toByteArray()), "utf-8"));
//        String line = null;
//        while ((line = bufferedReader.readLine()) != null) {
//            System.out.println(line);
//        }

        File outputFile = new File("E:\\ideaprojectTestFile\\excelCopy.zip");
        OutputStream outputStream = new FileOutputStream(outputFile);
        byteArray.writeTo(outputStream);

        outputStream.close();
        byteArray.close();

    }
}

https://www.cnblogs.com/jianyong-long/p/9693061.html

https://blog.csdn.net/justry_deng/article/details/81042379