java实现批量下载 多文件打包成zip格式下载

本文实例为大家分享了java实现批量下载的具体代码,供大家参考,具体内容如下

现在的需求的:

根据产品族、产品类型,下载该产品族、产品类型下面的pic包;

pic包是zip压缩文件;

t_product表:

这些包以blob形式存在另一张表中:

t_imagefile表:

现在要做的是:将接入网、OLT下面的两个包downloadPIC:MA5800系列-pic.zip 和 MA5900-pic.rar一起打包成zip压缩文件下载下来;

代码:

ProductController.java:

/**

* 根据产品族、产品类型下载照片包

*/

@RequestMapping("/downloadwBatch")

public void downloadwBatch(HttpServletRequest request, HttpServletResponse response, String productFamily, String productType){

//http://localhost:8080/MySSM/downloadwBatch?productFamily=接入网&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();

}

//获取要下载的照片包名

Map<String, String> params = new HashMap<String, String>();

params.put("productFamily", productFamily);

params.put("productType", productType);

List<String> packageNames = productService.getPackageNamesByFamilyAndType(params);

//根据包名获取待下载的文件 文件名-字节数组的形式

Map<String, byte[]> files = new HashMap<String, byte[]>();

for(String packageName : packageNames){

byte[] f = productService.getPackage(packageName);

if(f!=null){

files.put(packageName, f);

}

}

//设置下载的压缩包名

String zipName = productFamily + "_"+ productType + ".zip";

//根据文件,进行压缩,批量下载

if(files.size() > 0){

productService.downloadBatchByFile(response, files, zipName);

}

}

ProductService.java:

/**

* 根据包名获取文件

*/

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;

}

/**

* 根据产品族、产品类型 获取待下载的包名

* @param params

* @return

*/

public List<String> getPackageNamesByFamilyAndType(Map<String, String> params) {

List<String> packageNames = productMapper.getPackageNamesByFamilyAndType(params);

return packageNames;

}

/**

* 根据文件,进行压缩,批量下载

* @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(); //每个zip文件名

byte[] file = entry.getValue(); //这个zip文件的字节

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:

/**

* 根据包名获取文件

*/

public ImageFile getPackage(String packageName) throws Exception;

/**

* 据产品族、产品类型 获取待下载的包名

*/

public List<String> getPackageNamesByFamilyAndType(Map<String, String> params);

ProductMapper.xml:

<!-- 根据包名获取文件 -->

<select id="getPackage" parameterType="java.lang.String" resultType="com.cy.model.ImageFile">

select * from t_imagefile where packageName = #{packageName}

</select>

<!-- 跟据产品族、产品类型 获取待下载的包名 -->

<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>

测试:

在浏览器中输入:http://localhost:8080/MySSM/downloadwBatch?productFamily=接入网&productType=OLT

下载结果如下:

简单的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) {

//需要压缩的文件--包括文件地址和文件名

String [] path ={"E:\\360DocProtect\\01.txt","E:\\360DocProtect\\02.docx"};

// 要生成的压缩文件地址和文件名称

String desPath = "D:\\DOWNLOADS\\new.zip";

File zipFile = new File(desPath);

ZipOutputStream zipStream = null;

FileInputStream zipSource = null;

BufferedInputStream bufferStream = null;

try {

//构造最终压缩包的输出流

zipStream = new ZipOutputStream(new FileOutputStream(zipFile));

for(int i =0;i<path.length;i++){

File file = new File(path[i]);

//将需要压缩的文件格式化为输入流

zipSource = new FileInputStream(file);

//压缩条目不是具体独立的文件,而是压缩包文件列表中的列表项,称为条目,就像索引一样

ZipEntry zipEntry = new ZipEntry(file.getName());

//定位该压缩条目位置,开始写入文件到压缩包中

zipStream.putNextEntry(zipEntry);

//输入缓冲流

bufferStream = new BufferedInputStream(zipSource, 1024 * 10);

int read = 0;

//创建读写缓冲区

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 {

//关闭流

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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