springMVC如何实现文件的下载?
我的数据库里一张表保存三个参数,分别是:id,name(文件名),path(在服务器上的文件路径);
此时对应的服务器上有对应的文件。
我要把它下载到本地计算机上,不用struts2,下载代码怎么写,controller应该怎么写?如何能实现和struts2下载功能一样的效果。
刚刚接触springMVC,以前都是用struts2的,现在用springMVC就不会了,哪位大哥给指点一下,最好能附上代码,谢谢,分会全部奉上 springmvc 服务器 计算机
[解决办法]
这个SpringMVC没什么关系吧,我在jsp中做过一个图片的下载,你可能要修改下代码
response.setContentType("application/x-download");
//application.getRealPath("/main/mvplayer/CapSetup.msi");获取的物理路径
String filedownload = request.getRealPath("/")+"/organization/img/"+"组织架构图.png";
String filedisplay = "组织架构图.png";
filedisplay = URLEncoder.encode(filedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);
java.io.OutputStream outp = null;
java.io.FileInputStream in = null;
try
{
outp = response.getOutputStream();
in = new java.io.FileInputStream(filedownload);
byte[] b = new byte[1024];
int i = 0;
while((i = in.read(b)) > 0)
{
outp.write(b, 0, i);
}
outp.flush();
//要加以下两句话,否则会报错
//java.lang.IllegalStateException: getOutputStream() has already been called for this respons
out.clear();
out = pageContext.pushBody();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace();
}
finally
{
if(in != null)
{
in.close();
in = null;
}
if(in != null)
{
in.close();
in = null;
}
}
这些在网上找也很好找的
[解决办法]
//下载方法
private void downloadFile(File file){
String fileName = file.getName();
try {
fileName = URLEncoder.encode(fileName, "UTF-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
contextPvd.getResponse().setContentType("application/zip");
contextPvd.getResponse().addHeader("Content-Disposition", "attachment;filename=" + fileName);
OutputStream outp = null;
FileInputStream in = null;
try {
outp = contextPvd.getResponse().getOutputStream();
in = new FileInputStream(file);
byte[] b = new byte[1024];
int i = 0;
while ((i = in.read(b)) > 0) {
outp.write(b, 0, i);
}
outp.flush();
} catch (Exception e) {
//log.error("", e);
} finally {
if (in != null) {
try {
in.close();
in = null;
} catch (IOException e) {
e.printStackTrace();
}
}
if (outp != null) {
try {
outp.close();
outp = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
}