Servlet 下载文件及支持中文文件名

Sevlet 下载pdf文件 支持中文文件名

package html2pdf.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownloadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    public DownloadServlet() {
        super();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String fileName = "pdf文件.pdf";  // 要下载的文件名
        // 通过文件名找出文件的所在目录
        String path = "C:\Users\mail\eclipse-workspace\html2pdf\src\main\webapp\htmlReport";
        // 得到要下载的文件 
        File file = new File(path + "\" + fileName);
        // 如果文件不存在
        if (!file.exists()) {
            request.setAttribute("message", "您要下载的资源已被删除！");
            request.getRequestDispatcher("/message.jsp").forward(request, response);
            return;
        }
        // 设置响应头，控制浏览器下载该文件
        response.setHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("GBK"),"ISO8859_1"));  // 支持中文文件名
        FileInputStream in = new FileInputStream(path + "\" + fileName);  // 读取要下载的文件,保存到文件输入流
        OutputStream out = response.getOutputStream();  // 创建输出流
        byte buffer[] = new byte[1024];  // 创建缓冲区
        int len = 0;
        while ((len = in.read(buffer)) > 0) {  // 循环将输入流中的内容读取到缓冲区当中
            out.write(buffer, 0, len);  // 输出缓冲区的内容到浏览器，实现文件下载
        }
        in.close();  // 关闭文件输入流
        out.close();  // 关闭输出流
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

部署描述符

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Archetype Created Web Application</display-name>
  
  <servlet>
    <servlet-name>DownloadServlet</servlet-name>
    <servlet-class>html2pdf.controller.DownloadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>DownloadServlet</servlet-name>
    <url-pattern>/download</url-pattern>
  </servlet-mapping>
  
</web-app>