頁面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<a href="/downloadServlet01?filename=1.jpg">1.jpg</a><br/>
<a href="/downloadServlet01?filename=2.txt">2.txt</a><br/>
<a href="/downloadServlet01?filename=3.zip">3.zip</a><br/>
<a href="/downloadServlet01?filename=劉亦菲.jpg">劉亦菲.jpg</a><br/>
</body>
</html>
package com.itheima.sh.web;
import java.net.URLEncoder;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
@WebServlet("/downloadServlet01")
public class DownloadServlet01 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//解決亂碼.請求亂碼和相應亂碼
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//獲取文件
String filename = request.getParameter("filename");
//定義一個全局域
ServletContext servletContext = getServletContext();
//獲取絕對路徑(注該路徑在WEB-INF下面)
String realPath = servletContext.getRealPath("WEB-INF//"+filename);
//獲取路徑的文件
String mimeType = servletContext.getMimeType(filename);
//定義一個file
File file = new File(realPath);
//如果文件存在的話
if(file.exists()){
//如果存在的話,就獲取兩個頭和兩個流
//兩個頭已經存在
String encodeName = URLEncoder.encode(filename, "utf-8");
// response.setHeader("content-disposition", "attachment;filename=" + name);
//attechment文件是下載,不寫的話就是瀏覽器打開.
response.setHeader("content-disposition", "attachment;filename=" + encodeName);
//獲取文件類型
response.setContentType(mimeType);
//創建字節輸入流對象關聯服務器的文件
FileInputStream fis = new FileInputStream(file);
//創建輸入流向瀏覽器中寫出數據
ServletOutputStream os = response.getOutputStream();
//拷貝數據
byte[] buf = new byte[1024];
int len = 0;
while((len=fis.read(buf))!=-1){
os.write(buf,0,len);
}
//釋放資源
os.close();
fis.close();
}
}
}
