package com.dy.pipIrrWebFile.download;
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import com.dy.pipIrrGlobal.dyFile.FileOperate;
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import com.dy.pipIrrGlobal.dyFile.FileRestVo;
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import com.dy.pipIrrGlobal.pojoFi.WebFile;
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import jakarta.servlet.ServletOutputStream;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import java.io.File;
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import java.io.FileInputStream;
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import java.net.URLEncoder;
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/**
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* web文件下载
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*/
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@Slf4j
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@RestController
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@RequestMapping(path="download")
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@SuppressWarnings("unchecked")//java版本越高，对泛型约束越严，所以配置SuppressWarnings("unchecked")
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public class DownloadFileCtrl {
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@Autowired
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private DownloadFileSv sv ;
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@Autowired
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private FileOperate fileOp ;
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@Value("${dy.webFile.fmUrl}")
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private String fmUrl ;
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/**
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* 通过web文件数据库实体id下载该文件
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* @param id
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* @return
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*/
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@GetMapping("/down")
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public void down(String id, HttpServletRequest req, HttpServletResponse rep){
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try{
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WebFile fPo = sv.selectById(id) ;
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if(fPo != null){
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FileRestVo frVo = fileOp.parseHashcode(fmUrl, fPo.hash) ;
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if(frVo.fileSysAbsolutePath != null){
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if(!frVo.fileSysAbsolutePath.endsWith("\\\\") && !frVo.fileSysAbsolutePath.endsWith("/") ){
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frVo.fileSysAbsolutePath = frVo.fileSysAbsolutePath + "/" ;
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}
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}
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String filePath = frVo.fileSysAbsolutePath + fPo.filePath ;
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File f = new File(filePath) ;
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if(f.exists()){
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String fileReName = fPo.orgName + "." + fPo.extName ;
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//URLEncoder.encode可以防止中文乱码
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fileReName = URLEncoder.encode(fileReName, "UTF-8").replaceAll("\\+", "%20");
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rep.addHeader("content-type", "application/octet-stream");
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rep.addHeader("Content-Disposition", "attachment;fileName=" + fileReName);
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ServletOutputStream out = null;
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FileInputStream in = null ;
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try {
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out = rep.getOutputStream() ;
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} catch (Exception ee) {
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out = null ;
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}finally{
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if(out != null){
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byte[] bs = new byte[1024] ;
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int len = -1 ;
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try {
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in = new FileInputStream(f);
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len = in.read(bs) ;
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while(len != -1){
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out.write(bs, 0, len);
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len = in.read(bs) ;
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}
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} catch (Exception eee) {
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} finally {
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if(out != null){
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try{
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out.flush();
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out.close();
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}catch(Exception e){
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}finally{
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if(in != null){
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try{
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in.close();
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}catch(Exception e){
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}
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}
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}
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}
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}
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}
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}
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}else{
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}
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}else{
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}
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}catch (Exception e){
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log.error("下载文件时异常", e);
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}
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}
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}
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