爲了更好的演示,首先創建一個文件實體FileBean,包含了文件路徑和文件名稱:
package com.javaweb.entity; import java.io.Serializable; /** * 文件實體類*/ public class FileBean implements Serializable{ private static final long serialVersionUID = -5452801884470115159L; private Integer fileId;//主鍵 private String filePath;//文件保存路徑 private String fileName;//文件保存名稱 public FileBean(){ } //Setters and Getters ... }
接下來,在控制層的方法裏(示例爲Spring MVC)進行讀入多個文件List<FileBean>,壓縮成myfile.zip輸出到瀏覽器的客戶端:
/** * 打包壓縮下載文件 */ @RequestMapping(value = "/downLoadZipFile") public void downLoadZipFile(List<FileBean> fileList, HttpServletResponse response) throws IOException{ String zipName = "myfile.zip"; response.setContentType("APPLICATION/OCTET-STREAM"); response.setHeader("Content-Disposition","attachment; filename="+zipName); ZipOutputStream out = new ZipOutputStream(response.getOutputStream()); try { for(Iterator<FileBean> it = fileList.iterator();it.hasNext();){ FileBean file = it.next(); ZipUtils.zipFile(file.getFilePath()+file.getFileName(), out); response.flushBuffer(); } } catch (Exception e) { e.printStackTrace(); }finally{ out.close(); } }
最後,附上ZipUtils壓縮文件的工具類,這樣便實現了多文件的壓縮下載功能:
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream;
/**
* 壓縮文件工具類
*/ public class ZipUtils { public static void doCompress(String srcFile, String zipFile) throws Exception { doCompress(new File(srcFile), new File(zipFile)); } /** * 文件壓縮 * @param srcFile 目錄或者單個文件 * @param destFile 壓縮後的ZIP文件 */ public static void doCompress(File srcFile, File destFile) throws Exception { ZipOutputStream out = new ZipOutputStream(new FileOutputStream(destFile)); if(srcFile.isDirectory()){ File[] files = srcFile.listFiles(); for(File file : files){ doCompress(file, out); } }else { doCompress(srcFile, out); } } public static void doCompress(String pathname, ZipOutputStream out) throws IOException{ doCompress(new File(pathname), out); } public static void doCompress(File file, ZipOutputStream out) throws IOException{ if( file.exists() ){ byte[] buffer = new byte[1024]; FileInputStream fis = new FileInputStream(file); out.putNextEntry(new ZipEntry(file.getName())); int len = 0 ; // 讀取文件的內容,打包到zip文件 while ((len = fis.read(buffer)) > 0) { out.write(buffer, 0, len); } out.flush(); out.closeEntry(); fis.close(); } } }
普通單個文件的下載方法:
@RequestMapping(value = "/downloadFile") @ResponseBody public void downloadFile (HttpServletResponse response) {
OutputStream os = null;
try {
os = response.getOutputStream();
File file = new File("D:/javaweb/demo.txt");
// Spring工具獲取項目resources裏的文件
File file2 = ResourceUtils.getFile("classpath:shell/sinit.sh"); if(!file.exists()){
return;
} response.reset(); response.setHeader("Content-Disposition", "attachment;filename=demo.txt"); response.setContentType("application/octet-stream; charset=utf-8"); os.write(FileUtils.readFileToByteArray(file)); } catch (Exception e) { e.printStackTrace(); }finally{ IOUtils.closeQuietly(os); } }
另外一種下載方法ResponseEntity<byte[]>:
/** * Spring下載文件 * @param request * @throws IOException */ @RequestMapping(value="/download") public ResponseEntity<byte[]> download(HttpServletRequest request) throws IOException{
// 獲取項目webapp目錄路徑下的文件 String path = request.getSession().getServletContext().getRealPath("/"); File file = new File(path+"/soft/javaweb.zip"); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); headers.setContentDispositionFormData("attachment", "javaweb.zip"); return new ResponseEntity<byte[]>(org.apache.commons.io.FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED); }
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