文件下载

悠悠 2021-12-14 12:55 313阅读 0赞

1，struts2文件下载：

1)Action配置

// 下载，  
public String downloadFile() throws Exception \{  
return SUCCESS;  
\}

// 文件下载（读取文件流的入口，必须返回一个文件输入流）  
public InputStream getDownloadFile() throws FileNotFoundException \{  
System.out.println(riskEvent.getFilePath());  
// 图片路径  
String fileName =basePath +"/"+ riskEvent.getFilePath();  
// 如果下载文件名为中文，进行字符编码转换  
getHttpResponse().setHeader("Content-Disposition","attachment;fileName="+riskEvent.getFilePath());  
InputStream inputStream = new FileInputStream(fileName);  
System.out.println(inputStream);  
return inputStream;  
\}

2）xml的配置

<action name="downloadFile" class="riskSurveyAction" method="downloadFile" >  
<result name="success" type="stream">  
<param name="contentDisposition">  
attachment;filename="$\{riskEvent.filePath\}"  
</param>  
<param name="inputName">downloadFile</param>  
<param name="bufferSize">2048</param>  
</result>  
</action>

2，自己写的下载

/\*\*  
\* 下载小票  
\* @throws IOException  
\*/  
public void downLoadFile() throws IOException\{  
String fileName = riskEvent.getFilePath();  
// 图片路径  
String filePath = basePath +"/"+ fileName.substring(0, fileName.lastIndexOf(".")) + "/"+fileName;  
HttpServletResponse response = getHttpResponse();  
File file = new File(filePath);  
long len = file.length();  
down(file, fileName, response);  
\}  
  
public void down(File f,String filename,HttpServletResponse response)  
\{  
response.reset();  
response.setHeader("content-disposition","attachment; filename="+filename); //设置下载的文件名  
long fileLength=f.length();  
String length1=String.valueOf(fileLength);  
response.setHeader("Content\_Length",length1); //下载文件的大小  
InputStream in=null;  
OutputStream out = null;  
try\{  
in = new FileInputStream( f );  
out = response.getOutputStream();  
byte\[\] buffer = new byte\[2097152\];  
int ins = in.read(buffer);//读取字节到buffer中  
//ins == -1 时 。就已经是文件的结尾了  
while ( ins != -1 ) \{  
out.write(buffer, 0, ins);//将缓存buffer中的数据写到文件中  
ins = in.read(buffer);  
\}  
in.close();  
out.flush();  
out.close();  
\}catch (Exception e) \{  
System.out.println("--下载发生异常--");  
try \{  
in.close();  
out.flush();  
out.close();  
\} catch (IOException e1) \{  
System.out.println("--关闭发生异常--");  
in = null;  
out = null;  
e1.printStackTrace();  
\}  
\}  
\}

转载于:https://www.cnblogs.com/siashan/p/4276510.html