目录
- Java文件分级目录打包下载zip
- 打包下载zip的工具类
- 页面下载方法的接口
- 页面下载调用后台接口
- 这是页面文件的展示页
- 下载成功的展示
- 解压后的文件
- 总结
Java文件分级目录打包下载zip
说一下具体实现的功能吧,要将页面的文件存放在对应的文件目录,打成压缩包下载。
由于第一次接触,也是找了一整天网上的方法,费尽脑汁,终于实现了。
打包下载zip的工具类
直接调用即可
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.util.ArrayList; import java.util.Enumeration; import java.util.List; import org.apache.commons.codec.binary.Base64; import org.apache.commons.collections.CollectionUtils; import org.apache.tools.zip.ZipEntry; import org.apache.tools.zip.ZipFile; import org.apache.tools.zip.ZipOutputStream; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * @Author: fd * @Date 2020/7/28 21:33 * @Description: */ public class ZipUtiles { private static Logger logger = LoggerFactory.getLogger(ZipUtiles.class); // 目录标识判断符 private static final String PATCH = "/"; // 基目录 private static final String BASE_DIR = "/b/"; // 缓冲区大小 private static final int BUFFER = 2048; // 字符集 private static final String CHAR_SET = "UTF-8"; public static void compress(File srcFile, ZipOutputStream zipOutputStream, String basePath) throws Exception { if (srcFile.isDirectory()) { compressDir(srcFile, zipOutputStream, basePath); } else { compressFile(srcFile, zipOutputStream, basePath); } } private static void compressDir(File dir, ZipOutputStream zipOutputStream, String basePath) throws Exception { try { // 获取文件列表 File[] files = dir.listFiles(); if (files.length < 1) { ZipEntry zipEntry = new ZipEntry(basePath + dir.getName() + PATCH); zipOutputStream.putNextEntry(zipEntry); zipOutputStream.closeEntry(); } for (int i = 0,size = files.length; i < size; i++) { compress(files[i], zipOutputStream, basePath + dir.getName() + PATCH); } } catch (Exception e) { throw new Exception(e.getMessage(), e); } } private static void compressFile(File file, ZipOutputStream zipOutputStream, String dir) throws Exception { try { // 压缩文件 ZipEntry zipEntry = new ZipEntry(dir + file.getName()); zipOutputStream.putNextEntry(zipEntry); // 读取文件 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file)); int count = 0; byte data[] = new byte[BUFFER]; while ((count = bis.read(data, 0, BUFFER)) != -1) { zipOutputStream.write(data, 0, count); } bis.close(); zipOutputStream.closeEntry(); } catch (Exception e) { throw new Exception(e.getMessage(),e); } } public static void main(String[] args) { try { ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(new File("D:/a/a.zip"))); zipOutputStream.setEncoding(CHAR_SET); List<File> files = new ArrayList<File>(); files.add(new File("D:\\a\\b\\1.jpg")); files.add(new File("D:\\a\\b\\2.jfif")); if (CollectionUtils.isEmpty(files) == false) { for (int i = 0,size = files.size(); i < size; i++) { compress(files.get(i), zipOutputStream, BASE_DIR); } } // 冲刷输出流 zipOutputStream.flush(); // 关闭输出流 zipOutputStream.close(); } catch (Exception e) { e.printStackTrace(); } } }
页面下载方法的接口
业务逻辑可跟需求修改,这里主要是查询数据库得出文件名,根据自己需求构建分级文件名,存入集合,循环将对应的文件存放到文件夹里,调用工具类打成压缩包下载。
/** * 打包下载 */ @RequestMapping(value = "/packdownload", method = RequestMethod.GET) public void packdownload(HttpSession session, HttpServletRequest request, HttpServletResponse response) { PrintWriter outWriter = null; try { //查询条件 String loanId = request.getParameter("loanId")==null?"":request.getParameter("loanId").trim(); String contNo = request.getParameter("contNoStr")==null?"":request.getParameter("contNoStr").trim(); Criteria cri = new Criteria(); cri.clear(); //业务需求 查询文件的条件 if(StringUtils.isNotBlapythonnk(loanId) && !loanId.equals("")){ cri.put("loanId",loanId); } //查询出来的文件集合 List<TFileConfig> tFileConfigList = fileConfigService.selectByCondition(cri); if(tFileConfigList != null && tFileConfigList.size() > 0){ String zipName = contNo + "信贷档案信息.zip"; response.setContentType("application/octet-stream");// 指明response的返回对象是文件流 response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(zipName, "UTF-8")); ZipOutputStream zipOutputStream = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream())); zipOutputStream.setMethod(ZipOutputStream.DEFLATED);//设置压缩方法 try { //以下代码为 根据自己所需条件查询数据库得出文件夹名 构建二级文件夹名 List<File> files = new ArrayList<File>(); List<String> totalFolderList = new ArrayList<Strijavascriptng>(); TFileConfig fileConfig = null; for (int i = 0;i < tFileConfigList.size(); i++){ fileConfig = tFileConfigList.get(i); cri.clear(); cri.put("loanConfigId",fileConfig.getLoanConfigId()); List<TLoanConfig> loanConfigList = tLoanConfigService.selectByCondition(cri); //根据loanConfigId 查找对应 的 配置类名 if(loanConfigList != null && loanConfigList.size() > 0){ String folderName = loanConfigList.get(0).getLoanConfigName(); //子类文件名 cri.clear(); cri.put("superIds",loanConfigList.get(0).getSuperId()); List<TLoanConfig> superConfigList = tLoanConfigService.selectByCondition(cri); if(superConfigList != null && superConfigList.size() > 0){ TLoanConfig config = superConfigList.get(0); String superConfigName = config.getLoanConfigName(); //父类文件夹名 totalFolderList.add(superConfigName + "\\" + folderName + "\\"); //构建二级文件夹名 } files.add(new File(fileConfig.getRealPath())); } } if (CollectionUtils.isEmpty(files) == false) { for (int i = 0,size = totalFolderList.size(); i < size; i++) { //调用工具类方法 ZipUtiles.compress(files.get(i), zipOutputStream, totalFolderList.get(i)); } response.flushBuffer(); // 冲刷输出流 zipOutputStream.flush(); zipOutputStream.finish(); // 关闭输出流 zipOutputStream.close(); } catch (Exception e) { e.printStackTrace(); } }else{ outWriter = response.getWriter(); outWriter.println("<script>alert('该日期暂无文件')';</script>"); return; } } catch (Exception e) { try { outWriter = response.getWriter(); } catch (IOException e1) { e1.printStackTrace(); } logger.error("ImportfileController.java-packdownload-Exception: ", e); outWriter.println("<script>alert('下载异常')';</scrippythont>"); return; } }
页面下载调用后台接口
function subFrm(){ var options = { dataType: 'json', iframe: false, resetForm: true, success: function(data) { debugger; if(data.code == 1){ layer.alert('校验成功', {icon: 1},function(index){ var url = pcs.common.path + '/admin/sysfiles/packdownload?loanId=' + $("#loanId").val() + "&contNoStr=" + $("#contNoStr").val(); window.location.href = url; //关闭弹窗 setTimeout(function () { var index = parent.layer.getFrameIndex(window.name); parent.layer.close(index); }, 500) }); }else{ layer.alert(data.msg, {编程客栈icon: 2}); 编程 } }, error:function(){ layer.alert('页面已过期,请刷新', {icon: 2},function(){ window.location.href = pcs.common.path + '/admin/user/confirmPwd'; }); } }; $.AJAXSetup({contentType:'application/x-www-form-urlencoded;charset=utf-8'}); $('#frm').ajaxSubmit(options); }
这是页面文件的展示页
点击下载即可打包文件,下载压缩包。
下载成功的展示
解压后的文件
总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程客栈(www.devze.com)。
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