java上传下载文件，中文文件名不显示或乱码

时间：2021-08-31 20:57:53

参考这里：https://my.oschina.net/pingpangkuangmo/blog/376332

上传文件页面：

<body>
<form method="post" action="${pageContext.request.contextPath }/fileUpload" enctype="multipart/form-data">
    选择一个文件:
    <input type="file" name="uploadFile" />
    <br/><br/>
    <input type="submit" value="上传" />
</form>
</body>

上传文件后，由springmvc处理请求： 

/**
 * 上传文件
 * @param file
 * @throws IOException 
 */
@RequestMapping("/fileUpload")
public ModelAndView fileUpload(@RequestParam("uploadFile") CommonsMultipartFile file) {
//获取文件名称
String fileName = file.getOriginalFilename();
//保存文件
File tempfile = new File("E:/zzhtml/"+fileName);
OutputStream os = null;
InputStream is = null;
try {
is = file.getInputStream();
byte[] bs = new byte[1024];  
        int len;  
        os = new FileOutputStream(tempfile);  
        while ((len = is.read(bs)) != -1) {  
            os.write(bs, 0, len);  
        }  
} catch (IOException e) {
e.printStackTrace();
} finally{        
        try {
        if(os!=null){
        os.close();
        }
        if(is!=null){
        is.close(); 
        }
} catch (IOException e) {
e.printStackTrace();
}     
}
ModelAndView mv = new ModelAndView("uploadSuccess");
mv.addObject("fileName", fileName);
        return mv;  
}

下载文件页面： 

<body>
上传成功<br><a href="${pageContext.request.contextPath }/fileDown?fileName=${fileName}">${fileName }</a>
</body>

点击下载文件，后台处理： 

@RequestMapping("/fileDown")
public String fileDown(@RequestParam("fileName")String fileName,HttpServletResponse response) throws UnsupportedEncodingException{
String path="E:/zzhtml/";
String tempFileName = new String(fileName.getBytes("ISO8859-1"), "UTF-8");
//1.设置文件ContentType类型，这样设置，会自动判断下载文件类型  
        response.setContentType("application/x-msdownload");  
        //2.设置文件头：最后一个参数是设置下载文件名(假如我们叫a.pdf)  
        response.setHeader("Content-Disposition", "attachment;fileName="+new String(tempFileName.getBytes("GBK"),"ISO8859-1"));  //这里的fileName要是ISO8859-1编码
        ServletOutputStream out = null;  
        FileInputStream is = null ;
        //通过文件路径获得File对象 
        File file = new File(path +tempFileName);   
        try {  
        is= new FileInputStream(file);  
            //3.通过response获取ServletOutputStream对象(out)  
            out = response.getOutputStream();  
            int b = 0;  
            byte[] buffer = new byte[1024];  
            while ((b=is.read(buffer,0,buffer.length))!= -1){  
                //4.写到输出流(out)中  
                out.write(buffer,0,b);  
            }  
            out.flush();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }finally{
        try {
        if(is!=null){
        is.close();
        }
        if(out!=null){
        out.close();
        }
} catch (IOException e) {
e.printStackTrace();
}  
        }
return null;
}






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