Java下载压缩文件

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Java下载压缩文件

List<File> files = new ArrayList<>();
String fileName = URLEncoder.encode("文件名" + dateToDayString + ".zip", "UTF-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
response.setHeader("Pragma", "public");
response.setDateHeader("Expires", (System.currentTimeMillis() + 10000));
// 使用有权限目录
String videoPath = "csv" + "/";
zipComponent.downLoadFiles(files, response, nasPath + videoPath, fileName);

package com.sf.argus.web.component;

import java.io.*;
import java.util.List;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import javax.servlet.http.HttpServletResponse;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IoUtil;
import cn.hutool.http.HttpRequest;
import cn.hutool.http.HttpResponse;
import cn.hutool.http.HttpUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
@Slf4j
public class ZipComponent {
    private String cosDomainProxy;
    private String nasPath;
    private String csv;

    public HttpServletResponse downLoadFiles(List<File> files, HttpServletResponse response, String zipPath,String zipName) {

        String zipFilename = zipPath + zipName;
        File file = new File(zipFilename);
        try (FileOutputStream fileOut = new FileOutputStream(file)) {
            log.info("准备新建下载");
            if (!file.exists()) {
                file.createNewFile();
                log.info("新建完成");
            }
            response.reset();
            // 创建文件输出流
            ZipOutputStream zipOut = new ZipOutputStream(fileOut);
            zipFile(files, zipOut);
            zipOut.close();
            fileOut.close();
            log.info("压缩文件是否生成:{} 文件大小:{}" , file.exists(),file.length());
            return downloadZip(file, response);
        } catch (Exception e) {
            log.error("downLoadFiles error", e);
        }
        return response;
    }
    /**
     * 把接受的全部文件打成压缩包
     */
    public void zipFile(List<File> files, ZipOutputStream outputStream) {
        int size = files.size();
        for (int i = 0; i < size; i++) {
            File file = files.get(i);
            zipFile(file, outputStream);
        }
    }

    /**
     * 根据输入的文件与输出流对文件进行打包
     */
    public void zipFile(File inputFile, ZipOutputStream outputStream) {
        InputStream inputStream = null;
        BufferedInputStream bins = null;
        try {
            String path = inputFile.getPath();
            StringBuilder sb = new StringBuilder();
            sb.append(cosDomainProxy).append(path);
            HttpRequest get = HttpUtil.createGet(sb.toString());
            HttpResponse execute = get.execute();
            log.info("path:{} from proxy read file status:{}", path, execute.getStatus());
            if (!execute.isOk()) {
                return;
            }
            inputStream = execute.bodyStream();
            bins = new BufferedInputStream(inputStream, 512);
            ZipEntry entry = new ZipEntry(inputFile.getName());
            outputStream.putNextEntry(entry);
            int nNumber;
            byte[] buffer = new byte[512];
            while ((nNumber = bins.read(buffer)) != -1) {
                outputStream.write(buffer, 0, nNumber);
            }
        } catch (Exception e) {
            log.error("zipFile error", e);
        } finally {
            // 关闭创建的流对象
            try {
                if (bins != null) {
                    bins.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                log.error("zipFile error", e);
            }
        }
    }

    public HttpServletResponse downloadZip(File file, HttpServletResponse response) {
        if (!file.exists()) {
            log.info("待压缩的文件目录:{}不存在", file);
        } else {
            try (InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()))) {
                // 以流的形式下载文件。
                byte[] buffer = new byte[fis.available()];
                while (fis.read(buffer) > 0) {
                    response.reset();
                    try (OutputStream toClient = new BufferedOutputStream(response.getOutputStream())) {
                        response.setContentType("application/octet-stream");
                        // 如果输出的是中文名的文件，在此处就要用URLEncoder.encode方法进行处理
                        response.setHeader("Content-Disposition",
                            "attachment;filename=" + new String(file.getName().getBytes("GB2312"), "ISO8859-1"));
                        toClient.write(buffer);
                        toClient.flush();
                    }
                }
            } catch (IOException ex) {
                log.error("downloadZip error", ex);
            } finally {
                try {
                    File f = new File(file.getPath());
                    f.delete();
                } catch (Exception e) {
                    log.error("delete file error", e);
                }
            }
        }
        return response;
    }
}

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