package com.lf.server.service.data;
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import com.alibaba.fastjson.JSON;
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import com.lf.server.controller.all.BaseController;
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import com.lf.server.entity.all.HttpStatus;
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import com.lf.server.entity.all.ResponseMsg;
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import com.lf.server.entity.all.SettingData;
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import com.lf.server.entity.ctrl.FileInfo;
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import com.lf.server.entity.sys.AttachEntity;
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import com.lf.server.entity.sys.UserEntity;
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import com.lf.server.helper.FileHelper;
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import com.lf.server.helper.PathHelper;
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import com.lf.server.helper.StringHelper;
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import com.lf.server.helper.WebHelper;
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import com.lf.server.service.sys.AttachService;
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import org.apache.commons.codec.digest.DigestUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.tomcat.util.http.fileupload.FileItem;
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import org.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory;
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import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;
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import org.apache.tomcat.util.http.fileupload.servlet.ServletRequestContext;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import org.springframework.web.multipart.MultipartFile;
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import org.springframework.web.multipart.support.StandardMultipartHttpServletRequest;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.net.URLEncoder;
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import java.util.*;
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/**
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* 数据上传服务类
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* @author WWW
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*/
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@Service
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public class UploaderService {
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@Autowired
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PathHelper pathHelper;
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@Autowired
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AttachService attachService;
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private final static Log log = LogFactory.getLog(UploaderService.class);
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private static final String NO_FILE = JSON.toJSONString(new ResponseMsg<String>(HttpStatus.NOT_FOUND, "文件找不到"));
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/**
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* 上传文件
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*/
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public ResponseMsg<String> upload(UserEntity ue, String tab, MultipartFile file, BaseController ctrl) {
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try {
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if (file == null && file.isEmpty()) {
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return ctrl.fail("文件上传为空", null);
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}
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if (file.getSize() > SettingData.MAX_FILE_SIZE) {
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return ctrl.fail(String.format("文件大于 %d MB", SettingData.MAX_FILE_SIZE / 1024 / 1024), null);
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}
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// 传输文件
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String oldName = file.getOriginalFilename();
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String filePath = pathHelper.getTempPath() + File.separator + oldName;
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File newFile = new File(filePath);
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file.transferTo(newFile);
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// 获取MD5
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String md5 = getFileMd5(filePath);
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AttachEntity entity = attachService.selectByGuid(md5);
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if (entity != null) {
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newFile.delete();
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return ctrl.success("文件已存在", md5);
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}
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AttachEntity ae = getAttachEntity(ue, tab, oldName, md5);
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String targetPath = pathHelper.getConfig().getUploadPath() + File.separator + ae.getPath();
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newFile.renameTo(new File(targetPath));
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int rows = attachService.insert(ae);
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return rows > 0 ? ctrl.success(md5) : ctrl.fail("保存文件失败", null);
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} catch (Exception ex) {
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return ctrl.fail(ex.getMessage(), null);
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}
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}
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private String getFileMd5(String filePath) throws IOException {
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FileInputStream fileStream = new FileInputStream(filePath);
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String md5 = DigestUtils.md5Hex(fileStream);
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fileStream.close();
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return md5;
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}
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protected AttachEntity getAttachEntity(UserEntity ue, String tab, String oldName, String md5) {
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AttachEntity entity = new AttachEntity();
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entity.setName(oldName);
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entity.setTab(tab);
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entity.setGuid(md5);
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String subPath = PathHelper.getUploadPath() + File.separator + md5;
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entity.setPath(subPath);
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if (ue != null) {
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entity.setCreateUser(ue.getId());
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}
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return entity;
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}
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/**
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* 下载文件
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*/
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public void download(String guid, HttpServletRequest req, HttpServletResponse res, BaseController ctrl) {
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try {
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if (StringHelper.isEmpty(guid)) {
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WebHelper.write2Page(res, NO_FILE);
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return;
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}
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AttachEntity entity = attachService.selectByGuid(guid);
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if (entity == null) {
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WebHelper.write2Page(res, NO_FILE);
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return;
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}
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setDownloadResponse(entity, res);
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String filePath = pathHelper.getConfig().getUploadPath() + File.separator + entity.getPath();
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// 通过response对象，获取到输出流
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ServletOutputStream outputStream = res.getOutputStream();
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// 定义输入流，通过输入流读取文件内容
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FileInputStream fileInputStream = new FileInputStream(filePath);
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int len = 0;
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byte[] bytes = new byte[1024];
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while ((len = fileInputStream.read(bytes)) != -1) {
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// 通过输入流读取文件数据，然后通过上述的输出流写回浏览器
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outputStream.write(bytes, 0, len);
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outputStream.flush();
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}
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// 关闭资源
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outputStream.close();
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fileInputStream.close();
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} catch (Exception ex) {
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try {
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String msg = JSON.toJSONString(new ResponseMsg<String>(HttpStatus.ERROR, "文件下载出错"));
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WebHelper.write2Page(res, msg);
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} catch (Exception e) {
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log.error(e.getMessage() + e.getStackTrace() + "\n");
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}
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log.error(ex.getMessage() + ex.getStackTrace() + "\n");
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}
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}
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private void setDownloadResponse(AttachEntity entity, HttpServletResponse res) throws IOException {
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String fileName = URLEncoder.encode(entity.getName(), "UTF-8");
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// 设置响应头中文件的下载方式为附件方式，以及设置文件名
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res.setHeader("Content-Disposition", "attachment; filename=" + fileName);
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// 设置响应头的编码格式为UTF-8
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res.setCharacterEncoding("UTF-8");
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// 通过response对象设置响应数据格式(如："text/plain; charset=utf-8")
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String ext = FileHelper.getExtension(entity.getName());
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String mime = FileHelper.getMime(ext);
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res.setContentType(mime);
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}
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/**
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* 上传文件
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*/
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public Object uploadData(HttpServletRequest request, HttpServletResponse res) throws Exception {
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StandardMultipartHttpServletRequest req = (StandardMultipartHttpServletRequest) request;
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req.setCharacterEncoding("utf-8");
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res.setContentType("application/json;charset=utf-8");
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Map<String, String> map = getParams(req);
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List<FileInfo> list = getFiles(req);
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return list.size();
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}
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private Map<String, String> getParams(StandardMultipartHttpServletRequest req) {
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Map<String, String> map = new HashMap<String, String>(3);
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Enumeration<String> enumeration = req.getParameterNames();
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while (enumeration.hasMoreElements()) {
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String key = enumeration.nextElement();
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String value = req.getParameter(key);
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map.put(key, value);
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}
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return map;
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}
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private List<FileInfo> getFiles(StandardMultipartHttpServletRequest req) throws Exception {
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List<FileInfo> list = new ArrayList<FileInfo>();
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String path = pathHelper.getTempPath();
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Iterator<String> iterator = req.getFileNames();
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while (iterator.hasNext()) {
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MultipartFile file = req.getFile(iterator.next());
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FileInfo fi = new FileInfo(file.getOriginalFilename());
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if (StringHelper.isEmpty(fi.getFileName())) {
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continue;
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}
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fi.setSize(file.getSize());
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fi.setPath(path + File.separator + fi.getFileName());
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file.transferTo(new File(fi.getPath()));
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list.add(fi);
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}
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return list;
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}
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public Object fileUpload(HttpServletRequest req, HttpServletResponse res) throws Exception {
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List<FileItem> items = getFileItem(req, res);
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return copeFileItems(items, req);
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}
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/**
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* 获取文件项
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*/
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private List<FileItem> getFileItem(HttpServletRequest req, HttpServletResponse res) throws Exception {
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// 处理中文乱码问题
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req.setCharacterEncoding("utf-8");
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// text/html;charset=utf-8
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res.setContentType("application/json;charset=utf-8");
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// 检查请求是/否为multipart/form-data类型
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if (!ServletFileUpload.isMultipartContent(req)) {
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throw new RuntimeException("表单的enctype属性不是multipart/form-data类型");
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}
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// 创建上传所需要的两个对象：磁盘文件对象+文件上传对象
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DiskFileItemFactory factory = new DiskFileItemFactory();
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ServletFileUpload sfu = new ServletFileUpload(factory);
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ServletRequestContext ctx = new ServletRequestContext(req);
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// 设置编码方式
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sfu.setHeaderEncoding("utf-8");
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factory.setSizeThreshold(4096);
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// 获取表单中的所有数据信息
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List<FileItem> list = sfu.parseRequest(ctx);
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return list;
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}
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/**
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* 处理解析内容：处理普通表单域和文件表单域
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*/
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private Object copeFileItems(List<FileItem> items, HttpServletRequest req) throws Exception {
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Map<String, String> map = new HashMap<String, String>(3);
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List<FileInfo> list = new ArrayList<FileInfo>();
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String path = pathHelper.getTempPath();
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for (FileItem item : items) {
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if (item.isFormField()) {
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String key = item.getFieldName();
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String value = item.getString("utf-8");
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map.put(key, value);
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continue;
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}
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FileInfo fi = copeFile(item, path, req);
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if (fi != null) {
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list.add(fi);
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}
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}
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return map;
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}
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/**
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* 处理文件
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*/
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private FileInfo copeFile(FileItem item, String path, HttpServletRequest req) {
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try {
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// 获取文件名，判断是否合法
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FileInfo fi = new FileInfo(item.getName());
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if (StringHelper.isEmpty(fi.getFileName())) {
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return null;
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}
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fi.setSize(item.getSize());
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fi.setPath(path + File.separator + fi.getFileName());
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item.write(new File(fi.getPath()));
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return fi;
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} catch (Exception ex) {
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log.error(ex.getMessage() + ex.getStackTrace() + "\n");
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return null;
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}
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}
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}
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