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javaweb 下载文件

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resp.sendRedirect("网页地址");         网页重定向

// 设置字符串的编码

req.setCharacterEncoding("utf-8");

resp.setContentType("text/html;charset=utf-8");

resp.setCharacterEncoding("utf-8");

// 写入界面

PrintWriter out = resp.getWriter();

out.print("内容");

// 获得配置文件中共有的那个配置文件

ServletContext sc = this.getServletContext();

// 苹果字符编码

ios-8859-1

// 下载文档   下载的文件还会乱码还未处理

//JAVA代码

package download;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.swing.filechooser.FileNameExtensionFilter;

public class DownloadSever extends HttpServlet {



   @Override

   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        // 呈现了web应用的Servlet视图

        ServletContext sc = this.getServletContext();

// 设置文件格式

        resp.setCharacterEncoding("utf-8");

       req.setCharacterEncoding("utf-8");

       resp.setContentType("text/html;charset = utf-8");

// 得到HTML文件中的标签的 fileName

       String fileName = req.getParameter("fileName");

// 设置字符编码格式

        String strname = new String(fileName.getBytes("ISO-8859-1"),"utf-8");

       System.out.println(strname);

//下载不同的文件

        if(strname.equals("AJAX基础.ppt")){

           down(resp,sc,"PPT/AJAX基础.ppt",".ppt");

       }else if(strname.equals("赵丽颖.jpg")){

           down(resp,sc,"image/赵丽颖.jpg",".jpg");

       }

   }

   /**

   * 下载文档

   * @param resp    响应

   * @param sc     整个文档公有的对象

   * @param path2    文件路径

   * @param form   下载的格式

   */

   public void down(HttpServletResponse resp,ServletContext sc,String path2,String form){

       resp.setHeader("Content-Disposition", "attachment; filename="+System.currentTimeMillis()+form);

       String path = sc.getRealPath(path2);

       // 得到写入流

       FileInputStream fis;

       try {

           fis = new FileInputStream(new File(path));

           ServletOutputStream sos= resp.getOutputStream();

           byte[] by = new byte[1024];

           int length = 0;

           while((length =fis.read() )!=-1 ){

               sos.write(by,0,length);

           }

       } catch (FileNotFoundException e) {

           e.printStackTrace();

       } catch (IOException e) {

           e.printStackTrace();

       }



   }



   @Override

   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

       // TODO Auto-generated method stub

       doGet(req, resp);

   }

// HTML文件

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<body>

   <a href="DownloadSever?fileName=AJAX基础.ppt">下载AJAX基础.ppt</a>

   <a href="DownloadSever?fileName=赵丽颖.jpg">下载赵丽颖图片</a>

</body>

</html>

// 配置文件



   <servlet>

    <servlet-name>DownloadSever</servlet-name>

    <servlet-class>download.DownloadSever</servlet-class>

</servlet>

<servlet-mapping>

    <servlet-name>DownloadSever</servlet-name>

    <url-pattern>/DownloadSever</url-pattern>

</servlet-mapping>}

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