package com.lf.server.service.all;
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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.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.logging.Log;
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import org.apache.commons.logging.LogFactory;
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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 javax.servlet.ServletOutputStream;
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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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/**
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* 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 UploadService {
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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(UploadService.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(ue.getId()) + File.separator + oldName;
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File newFile = new File(filePath);
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file.transferTo(newFile);
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double sizes = FileHelper.sizeToMb(file.getSize());
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// 获取MD5
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String md5 = FileHelper.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, sizes);
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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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/**
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* 获取附件实体类
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*/
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protected AttachEntity getAttachEntity(UserEntity ue, String tab, String oldName, String md5, double sizes) {
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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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entity.setSizes(sizes);
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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, HttpServletResponse res) {
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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);
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}
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log.error(ex.getMessage(), ex);
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}
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}
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/**
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* 设置下载响应信息
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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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