文件下载
程序员文章站
2022-06-20 09:03:32
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图片下载
一、单个文件下载
前端
<a class="btn btn-primary btn-download"
style="width:30px;height:30px;position:absolute;top:50px;left:50px;"
href="${pageContext.request.contextPath}/downloadOneFile.do?
fileUrl=http://xxx.net/assess/11141.jpg&fileName=${status.index+1}">下载
</a>
后端
/**
* TODO 下载单个文件到本地
* @param fileUrl 远程地址
* @param fileLocal 本地路径
* @throws Exception
*/
@RequestMapping(value = "downloadOneFile.do")
public void downloadFile(
String fileUrl,
String fileName,
HttpServletRequest request,
HttpServletResponse response) throws Exception {
String pString=fileUrl.substring(fileUrl.lastIndexOf("."));
System.out.println(pString);
response.setContentType("text/html;charset=UTF-8");
BufferedInputStream in = null;
BufferedOutputStream out = null;
URL url = new URL(fileUrl);
HttpURLConnection urlCon = (HttpURLConnection) url.openConnection();
urlCon.setConnectTimeout(6000);
urlCon.setReadTimeout(6000);
int code = urlCon.getResponseCode();
if (code != HttpURLConnection.HTTP_OK) {
throw new Exception("文件读取失败");
}
try {
response.setContentType("multipart/form-data");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition", "attachment;
filename="+java.net.URLEncoder.encode(fileName,"UTF-8")+pString);
response.setHeader("Content-Length",String.valueOf(urlCon.getContentLength()));
in = new BufferedInputStream(urlCon.getInputStream());
out = new BufferedOutputStream(response.getOutputStream());
byte[] data = new byte[1024];
int len = 0;
while (-1 != (len=in.read(data, 0, data.length))) {
out.write(data, 0, len);
}
System.out.println("下载成功");
}catch (Exception e) {
e.printStackTrace();
}finally {
if (in != null) {
in.close();
}
if (out != null) {
out.flush();
out.close();
}
}
}二、多个文件打包下载
前端
<a href="${pageContext.request.contextPath}/downloadFile_all.do?type=zdr&id=${pd.id}&base_name=主贷人材料" class="myself">批量下载</a>
后端
/**
* what 打包下载多个文件到本地并压缩
* when 2018-8-25
* who hzj
* @param type 文件保存的数组
* EG::type=[upload/2018/06/30/5d8d81f9a88d64e6e803bb499b870419.jpg, upload/2018/06/30/e495e0311096d997e8c54fd3fce2cf7a.jpg, upload/2018/06/30/183ae07a0d0ff07df8bcc798ea3e2700.jpg, upload/2018/06/30/f14add7bca1db43f1abb1e337672c22b.jpg, upload/2018/06/30/a42bc885f06b67aafd3fbad7351b2de6.jpg, upload/2018/06/30/1e71ca7c23cf5179ac921a17f0bfe174.jpg, upload/2018/06/30/68c9d4257399ac293c1644a9f514d224.jpg, , ]
*
*/
@RequestMapping(value = "erp/downloadFile_all.do")
@ResponseBody
public void downloadFile_all(
String type,
String id,
String base_name,
HttpServletRequest request,
HttpServletResponse response)throws Exception {
response.setContentType("application/json;charset=utf-8");
List<imgfile> FileNameList =new ArrayList<imgfile>(); // 用于存放即将下载的照片
//压缩文件名字
if(base_name.equals("") || base_name==null){
base_name =UUID.randomUUID().toString().replaceAll("-","");
}
base_name = new String(base_name.getBytes("ISO-8859-1"),"UTF-8");
base_name = new String(base_name.getBytes("GB2312"),"ISO-8859-1");
//方法查到五张表全部的信息
PageData pData = new PageData();
pData.put("dn","icbc_erp_kj_icbc");
pData.put("icbc_id",id);
System.out.println("主订单id:"+id);
if (id != null && !id.equals("")) {
//得到五张表全部的信息
PageData pageData = erp_wdrwService.icbc_form(pData);
String khName= new String(pageData.getString("c_name").getBytes("GB2312"),"ISO-8859-1");
System.out.println("客户姓名："+pageData.get("c_name"));
base_name =khName+"_"+base_name;
int imgCounts = 1;
if (pageData != null && !pageData.equals("")){
//XX材料
if(type.equals("xx")){
List<Object> zxImgsList = new ArrayList<>();
Object imgss1 = (String) pageData.get("imgstep2_1ss") + pageData.get("imgstep2_2ss")+ pageData.get("imgstep2_3ss") + pageData.get("imgstep2_4ss");
String[] zx_imgs = null;
imgss1 = imgss1.toString().replace("null","");
if (imgss1 != null && !imgss1.equals("")){
zx_imgs = ((String) imgss1).split("");
if (zx_imgs.length > 0){
for(int i=0;i<zx_imgs.length;i++){
if(zx_imgs[i]!=null&&!zx_imgs[i].equals("")){
imgfile imgfile=new imgfile();
imgfile.setImgurl("http://a.kcway.net/assess/"+zx_imgs[i]);
imgfile.setName(i+1+"");
imgfile.setFilelast(((String)zx_imgs[i]).substring(((String)zx_imgs[i]).lastIndexOf(".")+1,((String)zx_imgs[i]).length()));
FileNameList.add(imgfile);
imgCounts++;
}
}
}
}
}
if(type.equals("sq")){
List<Object> sqList = new ArrayList<>();
sqList.add(pageData.get("imgstep8_1v"));
sqList.add(pageData.get("imgstep8_2v"));
sqList.add(pageData.get("imgstep8_3v"));
sqList.add(pageData.get("imgstep8_4v"));
//给每张图片设置url,name,后缀名
if(sqList.size()>0){
for(int i=0;i<sqList.size();i++){
if(sqList.get(i)!=null&&!sqList.get(i).equals("")){
imgfile imgfile=new imgfile();
imgfile.setImgurl("http://a.kcway.net/assess/"+sqList.get(i));
imgfile.setName(i+1+"");
imgfile.setFilelast(((String)sqList.get(i)).substring(((String)sqList.get(i)).lastIndexOf(".")+1,((String)sqList.get(i)).length()));
FileNameList.add(imgfile);
imgCounts++;
}
}
}
}
if(type.equals("qy")){
List<Object> qyImgsList = new ArrayList<>();
Object imgss1 = (String) pageData.get("imgstep4_1ss") + pageData.get("imgstep4_2ss")+ pageData.get("imgstep4_3ss") + pageData.get("imgstep4_4ss") + pageData.get("imgstep4_5ss");
String[] qy_imgs = null;
imgss1 = imgss1.toString().replace("null","");
// 签约材料
if(imgss1 != null && !imgss1.equals("")){
qy_imgs = ((String) imgss1).split("");
if (qy_imgs.length > 0){
for(int i=0;i<qy_imgs.length;i++){
if(qy_imgs[i]!=null&&!qy_imgs[i].equals("")){
imgfile imgfile=new imgfile();
imgfile.setImgurl("http://a.kcway.net/assess/"+qy_imgs[i]);
imgfile.setName(i+1+"");
imgfile.setFilelast(((String)qy_imgs[i]).substring(((String)qy_imgs[i]).lastIndexOf(".")+1,((String)qy_imgs[i]).length()));
FileNameList.add(imgfile);
imgCounts++;
}
}
}
}
}
}
}
/** 原来写法 传一个request
//压缩文件名字
if(base_name.equals("") || base_name==null){
base_name =UUID.randomUUID().toString().replaceAll("-","");
}
System.out.println("名字::"+base_name);
List<String> imgsList = new ArrayList<>();
//把 String 类型转化成 数组
String[] arrayImg = type.replaceAll(", ",",").replace("[","").replace("]","").split(",");
//把数组转化成 list
imgsList = Arrays.asList(arrayImg);
//遍历list,给每个文件设置url路径,文件名字,文件类型 添加到另一个list中,进行下载时的压缩保存
int imgs = 1;
if(imgsList.size()>0){
for(int i=0;i<imgsList.size();i++){
if(imgsList.get(i)!=null&&!imgsList.get(i).equals("")){
imgfile imgfile=new imgfile();
imgfile.setImgurl("http://a.kcway.net/assess/"+imgsList.get(i));
imgfile.setName(i+1+"");
imgfile.setFilelast(imgsList.get(i).substring(imgsList.get(i).lastIndexOf(".")+1,imgsList.get(i).length()));
FileNameList.add(imgfile);
imgs++;
}
}
}
*/
// 把全部的文件放进文件数组中 File[] files
int leng = FileNameList.size();
System.out.println(leng);
InputStream inputStream = null;
DataInputStream in = null;
URL url=null;
OutputStream os=null;
ByteArrayOutputStream bos=null;
try {
bos = new ByteArrayOutputStream();
ZipOutputStream zos = new ZipOutputStream(bos);
UrlFilesToZip s = new UrlFilesToZip();
int idx = 1;
for (imgfile imgfile1:FileNameList) {
byte[] bytes=null;
bytes = s.getImageFromURL(imgfile1.getImgurl());
zos.putNextEntry(new ZipEntry(imgfile1.getName()+"."+imgfile1.getFilelast()));
zos.write(bytes,0,bytes.length);
//size=size+bytes.length;
zos.closeEntry();
idx++;
}
zos.close();
response.setContentType("application/force-download");// 设置强制下载不打开
response.addHeader("Content-Disposition","attachment;fileName="+base_name+".zip");// 设置文件名
os = response.getOutputStream(); //
os.write(bos.toByteArray());
os.close();
bos.close();
}catch(Exception ex) {
ex.printStackTrace();
ServletOutputStream sos = null;
try {
//response.setContentType("text/html;charset=utf-8");
sos = response.getOutputStream();
sos.write(
"<script>alert('下载失败,请稍后下载!');</script>".getBytes("UTF-8")
);
sos.flush();
} catch (IOException e1) {
e1.printStackTrace();
}finally{
if(null != sos){
try {
sos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}finally{
if(os!=null){
os.close();
}
if(bos!=null){
bos.close();
}
}
}