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這篇文章給大家分享的是有關(guān)java實(shí)現(xiàn)批量下載 多文件打包成zip格式下載的內(nèi)容。小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,一起跟隨小編過來看看吧。
具體內(nèi)容如下
現(xiàn)在的需求的:
根據(jù)產(chǎn)品族、產(chǎn)品類型,下載該產(chǎn)品族、產(chǎn)品類型下面的pic包;
pic包是zip壓縮文件;
t_product表:
這些包以blob形式存在另一張表中:
t_imagefile表:
現(xiàn)在要做的是:將接入網(wǎng)、OLT下面的兩個(gè)包downloadPIC:MA5800系列-pic.zip 和 MA5900-pic.rar一起打包成zip壓縮文件下載下來;
代碼:
ProductController.java:
/** * 根據(jù)產(chǎn)品族、產(chǎn)品類型下載照片包 */ @RequestMapping("/downloadwBatch") public void downloadwBatch(HttpServletRequest request, HttpServletResponse response, String productFamily, String productType){ //http://localhost:8080/MySSM/downloadwBatch?productFamily=接入網(wǎng)&productType=OLT try { productFamily = new String(productFamily.getBytes("iso-8859-1"), "utf-8"); productType = new String(productType.getBytes("iso-8859-1"), "utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } //獲取要下載的照片包名 Map<String, String> params = new HashMap<String, String>(); params.put("productFamily", productFamily); params.put("productType", productType); List<String> packageNames = productService.getPackageNamesByFamilyAndType(params); //根據(jù)包名獲取待下載的文件 文件名-字節(jié)數(shù)組的形式 Map<String, byte[]> files = new HashMap<String, byte[]>(); for(String packageName : packageNames){ byte[] f = productService.getPackage(packageName); if(f!=null){ files.put(packageName, f); } } //設(shè)置下載的壓縮包名 String zipName = productFamily + "_"+ productType + ".zip"; //根據(jù)文件,進(jìn)行壓縮,批量下載 if(files.size() > 0){ productService.downloadBatchByFile(response, files, zipName); } }
ProductService.java:
/** * 根據(jù)包名獲取文件 */ public byte[] getPackage(String packageName){ byte[] bag = null; try{ ImageFile m = productMapper.getPackage(packageName); if(m!=null){ bag = m.getPicture(); } }catch(Exception e){ e.printStackTrace(); } return bag; } /** * 根據(jù)產(chǎn)品族、產(chǎn)品類型 獲取待下載的包名 * @param params * @return */ public List<String> getPackageNamesByFamilyAndType(Map<String, String> params) { List<String> packageNames = productMapper.getPackageNamesByFamilyAndType(params); return packageNames; } /** * 根據(jù)文件,進(jìn)行壓縮,批量下載 * @param response * @param files * @throws Exception */ public void downloadBatchByFile(HttpServletResponse response, Map<String, byte[]> files, String zipName){ try{ response.setContentType("application/x-msdownload"); response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(zipName, "utf-8")); ZipOutputStream zos = new ZipOutputStream(response.getOutputStream()); BufferedOutputStream bos = new BufferedOutputStream(zos); for(Entry<String, byte[]> entry : files.entrySet()){ String fileName = entry.getKey(); //每個(gè)zip文件名 byte[] file = entry.getValue(); //這個(gè)zip文件的字節(jié) BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(file)); zos.putNextEntry(new ZipEntry(fileName)); int len = 0; byte[] buf = new byte[10 * 1024]; while( (len=bis.read(buf, 0, buf.length)) != -1){ bos.write(buf, 0, len); } bis.close(); bos.flush(); } bos.close(); }catch(Exception e){ e.printStackTrace(); } }
ProductMapper.java:
/** * 根據(jù)包名獲取文件 */ public ImageFile getPackage(String packageName) throws Exception; /** * 據(jù)產(chǎn)品族、產(chǎn)品類型 獲取待下載的包名 */ public List<String> getPackageNamesByFamilyAndType(Map<String, String> params);
ProductMapper.xml:
<!-- 根據(jù)包名獲取文件 --> <select id="getPackage" parameterType="java.lang.String" resultType="com.cy.model.ImageFile"> select * from t_imagefile where packageName = #{packageName} </select> <!-- 跟據(jù)產(chǎn)品族、產(chǎn)品類型 獲取待下載的包名 --> <select id="getPackageNamesByFamilyAndType" parameterType="java.util.Map" resultType="java.lang.String"> select packageName from t_imagefile m join t_product p on m.packageName = p.downloadPic where p.productFamily = #{productFamily} and p.productType = #{productType} </select>
測(cè)試:
在瀏覽器中輸入:http://localhost:8080/MySSM/downloadwBatch?productFamily=接入網(wǎng)&productType=OLT
下載結(jié)果如下:
簡(jiǎn)單的demo
package com.msznyl; import java.io.BufferedInputStream; 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; public class Download { public static void main(String[] args) { //需要壓縮的文件--包括文件地址和文件名 String [] path ={"E:\\360DocProtect\\01.txt","E:\\360DocProtect\\02.docx"}; // 要生成的壓縮文件地址和文件名稱 String desPath = "D:\\DOWNLOADS\\new.zip"; File zipFile = new File(desPath); ZipOutputStream zipStream = null; FileInputStream zipSource = null; BufferedInputStream bufferStream = null; try { //構(gòu)造最終壓縮包的輸出流 zipStream = new ZipOutputStream(new FileOutputStream(zipFile)); for(int i =0;i<path.length;i++){ File file = new File(path[i]); //將需要壓縮的文件格式化為輸入流 zipSource = new FileInputStream(file); //壓縮條目不是具體獨(dú)立的文件,而是壓縮包文件列表中的列表項(xiàng),稱為條目,就像索引一樣 ZipEntry zipEntry = new ZipEntry(file.getName()); //定位該壓縮條目位置,開始寫入文件到壓縮包中 zipStream.putNextEntry(zipEntry); //輸入緩沖流 bufferStream = new BufferedInputStream(zipSource, 1024 * 10); int read = 0; //創(chuàng)建讀寫緩沖區(qū) byte[] buf = new byte[1024 * 10]; while((read = bufferStream.read(buf, 0, 1024 * 10)) != -1) { zipStream.write(buf, 0, read); } } } catch (Exception e) { e.printStackTrace(); } finally { //關(guān)閉流 try { if(null != bufferStream) bufferStream.close(); if(null != zipStream) zipStream.close(); if(null != zipSource) zipSource.close(); } catch (IOException e) { e.printStackTrace(); } } } }
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