Spring4 MVC 支持中文文件名的文件下载

作者: 养码哥 | 来源:发表于2018-03-05 00:00 被阅读10次

Spring4 MVC 支持中文文件名的文件下载
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核心代码：

  `package controller;

    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.UnsupportedEncodingException;
    import java.net.URLEncoder;
    
    import javax.servlet.ServletOutputStream;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.io.IOUtils;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    public class UserinfoController {
@RequestMapping(value = "downloadFile")
public void testA(String fileName, HttpServletRequest request, HttpServletResponse response)
        throws UnsupportedEncodingException {
    try {
        String downPath = request.getSession().getServletContext().getRealPath("/");
        fileName = fileName.replace("_", "%");
        fileName = java.net.URLDecoder.decode(fileName, "utf-8");
        System.out.println(fileName);
        String downfileName = "";
        if (request.getHeader("USER-AGENT").toLowerCase().indexOf("msie") > 0) {// IE
            fileName = URLEncoder.encode(fileName, "UTF-8");
            downfileName = fileName.replace("+", "%20");// 处理空格变“+”的问题
        } else {// FF
            downfileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
        }
        System.out.println(">>>>>>>>>>"+downPath + fileName);
        File downloadFile = new File(downPath + fileName);
        response.setContentType("application/octet-stream;");
        response.setHeader("Content-disposition", String.format("attachment; filename=\"%s\"", downfileName)); // 文件名外的双引号处理firefox的空格截断问题
        response.setHeader("Content-Length", String.valueOf(downloadFile.length()));
        FileInputStream fis = new FileInputStream(downloadFile);
        ServletOutputStream out = response.getOutputStream();
        IOUtils.copy(fis, out);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
  }
}
`

index.jsp代码块

 `<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    </head>
    <body>
        
    <body>
<a
    href="downloadFile.spring?fileName=<%=java.net.URLEncoder.encode("中国.rar", "utf-8").toString().replace("%", "_")%>">中国.rar</a>
<br />
<a href="downloadFile.spring?fileName=postTest.rar">postTest.rar</a>
<br />
</body>
</html>`