java压缩下载图片并以zip流的形式下载到客户端
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了java压缩下载图片并以zip流的形式下载到客户端，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5445字，纯文字阅读大概需要8分钟。
内容图文
/**
*
* @param page
* @param rows
* @param works
* @return
* @author ffwwzz 下载zip
* @throws IOException
* @throws InterruptedException
*/
@RequestMapping("/download")
@ResponseBody
public CommonResult download(HttpServletRequest req, HttpServletResponse res)
throws IOException, InterruptedException {
List<Works> urls = service.selectPictures();
// List<String> urls = service.selectPictures1();
return new CommonResult().success("下载成功");
}
package com.sm.ayz.springcloud.aop;
import java.io.IOException;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import com.sm.ayz.springcloud.bean.works.Works;
import com.sm.ayz.springcloud.utils.FileUtil;
/**
* 业务切面
*/
@Aspect
@Component
public class DownloadAop {
@Pointcut("@annotation(com.sm.ayz.springcloud.annotation.Download)")
public void logCut() {
}
@AfterReturning(returning = "rvt", pointcut = "logCut()")
public void after(JoinPoint jp, Object rvt) throws IOException, InterruptedException {
@SuppressWarnings("unchecked")
List<Works> list = (List<Works>) rvt;
HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes())
.getRequest();
HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes())
.getResponse();
FileUtil.download(request, response, list);
System.out.println("方法最后执行.....");
}
}
@Override
@Download
public List<Works> selectPictures() {
return baseMapper.selectPictures();
}
package com.sm.ayz.springcloud.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.sm.ayz.springcloud.bean.WorkJsonEntity;
import com.sm.ayz.springcloud.bean.works.Works;
public class FileUtil {
/**
* 下载并压缩
*
* @param request
* @param response
* @param urls
* @author ffwwzz
* @throws IOException
* @throws InterruptedException
*/
public static boolean download(HttpServletRequest request, HttpServletResponse response, List<Works> worksList)
throws IOException, InterruptedException {
String downloadFilename = "用户作品收录记录" + DateFormatTreadLocal.df.get().format(new Date()) + ".zip";// 文件的名称
downloadFilename = URLEncoder.encode(downloadFilename, "UTF-8");// 转换中文否则可能会产生乱码
response.setContentType("application/octet-stream");// 指明response的返回对象是文件流
response.setHeader("Content-Disposition", "attachment;filename=" + downloadFilename);// 设置在下载框默认显示的文件名
ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
dozip.download(worksList, zos);
DateFormatTreadLocal.df.remove();
zos.flush();
zos.close();
return true;
}
/**
*
* @author fwz 静态工厂类，避免多线程工作数据读取失败
*
*/
static class DateFormatTreadLocal {
private static ThreadLocal<SimpleDateFormat> df = new ThreadLocal<SimpleDateFormat>() {
@Override
protected SimpleDateFormat initialValue() {
return new SimpleDateFormat("yyyy-MM-dd");
}
};
}
static class dozip {
public dozip() {
}
public static void download(List<Works> worksList, ZipOutputStream zos) throws IOException {
SimpleDateFormat sdf = DateFormatTreadLocal.df.get();
for (int i = 0; i < worksList.size(); i++) {
if (worksList.get(i).getWorksType() != null) {
if (worksList.get(i).getWorksType() == 0) {
if (StringUtils.isNotEmpty(worksList.get(i).getPicture())
&& worksList.get(i).getPicture().indexOf("http://") != -1) {
String[] urls = worksList.get(i).getPicture().split(",");
for (int j = 0; j < urls.length; j++) {
URL url = new URL(urls[j]);
zos.putNextEntry(new ZipEntry(worksList.get(i).getTitle() + "-" + j
+ sdf.format(worksList.get(i).getIncludedTime()) + String.format("%02d", i)
+ ".jpg"));
// FileInputStream fis = new FileInputStream(new File(files[i]));
InputStream fis = url.openConnection().getInputStream();
byte[] buffer = new byte[1024];
int r = 0;
while ((r = fis.read(buffer)) != -1) {
synchronized (zos) {
zos.write(buffer, 0, r);
}
}
fis.close();
}
}
}
if (worksList.get(i).getWorksType() == 2) { // 图文作品
if (StringUtils.isNotEmpty(worksList.get(i).getContent())
&& worksList.get(i).getContent().indexOf("http://") != -1) {
Gson gson = new Gson();
List<WorkJsonEntity> urls = gson.fromJson(worksList.get(i).getContent(),
new TypeToken<List<WorkJsonEntity>>() {
}.getType());
for (int j = 0; j < urls.size(); j++) {
URL url = new URL(urls.get(j).getImage());
zos.putNextEntry(new ZipEntry(worksList.get(i).getTitle() + "-" + j
+ sdf.format(worksList.get(i).getIncludedTime()) + String.format("%02d", i)
+ ".jpg"));
// FileInputStream fis = new FileInputStream(new File(files[i]));
InputStream fis = url.openConnection().getInputStream();
byte[] buffer = new byte[1024];
int r = 0;
while ((r = fis.read(buffer)) != -1) {
synchronized (zos) {
zos.write(buffer, 0, r);
}
}
fis.close();
}
}
}
}
}
System.out.println("fis---close");
}
}
}
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