JavaWeb响应下载（包含工具类）

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

纸上得来终觉浅，绝知此事要躬行！今天博主分享是关于javaweb的响应（response）下载

以下是我的Demo：

页面我就粘主要部分的代码

当然，现在的项目大家都使用框架，这里我使用的是（SSM），好了，粘代码

@Controller
@RequestMapping("/user")
public class UploadController {
@RequestMapping(value="/courseTab",method=RequestMethod.GET)
public void courseTab(HttpServletResponse response,HttpServletRequest request) throws IOException{
String path = request.getSession().getServletContext().getRealPath("/courseTab/课表上传模板.xls");
DownUtil.downMb(response, path, "课表模板"+DateFormat.formatSimple(new Date()));
}
}

这里我使用的DownUtil工具类是我自己写的，下来我粘到文章中

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;import javax.servlet.http.HttpServletResponse;/**
* @Title: DownUtil.java
* @Description:文件下载工具类
* @author ChoviWu
*/
public class DownUtil {/**
*
* @Description:
* @param @param response
* @param @param url 文件在数据库的路径
* @param @param base 文件存放的基础路径
* @param @param folderPath 上传所在的文件夹
* @param @return
* @param @throws IOException
* @return int
* @throws
*/
public static void downFile(HttpServletResponse response, String url,
String base, String folderPath) throws IOException {
// 文件的名称
String fileName = url.split("/")[1];
System.out.println(fileName);
// 文件的后缀
String last = url.substring(url.lastIndexOf(".") + 1);
System.out.println(last);
// 文件路径
String downFilePath = base + folderPath + fileName;Long fileLength = new File(downFilePath).length();// 文件的长度
if (fileLength != 0) {
response.reset();
response.setContentType("application/octet-stream;charset=utf-8"); // 改成输出excel文件
try {
response.setHeader(
"Content-disposition",
"attachment; filename="
+ new String(fileName.getBytes("utf-8"),
"ISO8859-1"));
response.setHeader("Content-Length", String.valueOf(fileLength));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
FileInputStream fis = null;
try {
fis = new FileInputStream(downFilePath);
bis = new BufferedInputStream(fis);
// 输出流
bos = new BufferedOutputStream(response.getOutputStream());
byte[] buff = new byte[2048];
int bytesread;
// 写文件
while (-1 != (bytesread = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesread);
}
// 跳转的路径
fis.close();
bis.close();
bos.close();} catch (FileNotFoundException e) {
System.out.println("File is Not Exsist!");
}} else {
// 抛异常}
}/**
*
* @Description: 下载的模板
* @param @param response
* @param @param path 路径名
* @param @param name 模板名称
* @param @throws IOException
* @return void
* @throws
*/
@SuppressWarnings("unused")
public static void downMb(HttpServletResponse response, String path,
String name) throws IOException {Long fileLength = new File(path).length();// 文件的长度
System.out.println("文件的长度：" + fileLength);
if (fileLength != 0) {
response.reset();
response.setContentType("application/octet-stream;charset=utf-8"); // 改成输出excel文件
try {
response.setHeader(
"Content-disposition",
"attachment; filename="
+ new String(name.getBytes("utf-8"),
"ISO8859-1"));
response.setHeader("Content-Length", String.valueOf(fileLength));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
FileInputStream fis = null;
try {
fis = new FileInputStream(path);
bis = new BufferedInputStream(fis);
// 输出流
bos = new BufferedOutputStream(response.getOutputStream());
byte[] buff = new byte[2048];
int bytesread;
// 写文件
while (-1 != (bytesread = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesread);
}
fis.close();} catch (FileNotFoundException e) {
System.out.println("File is Not Exsist!");}
}
}
}