spring mvc 下载

package com.yaspeed.controller;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.FileUtils;
import org.apache.log4j.Logger;
import org.springframework.context.annotation.Scope;  
import org.springframework.http.HttpHeaders;  
import org.springframework.http.HttpStatus;  
import org.springframework.http.MediaType;  
import org.springframework.http.ResponseEntity;  
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@Scope("prototype")   
@RequestMapping("download")
public class DownTemplateController {
    private static Logger log = Logger.getLogger(DownTemplateController.class);
    @RequestMapping("blackListExcel")    
    public ResponseEntity<byte[]> download(){    
        String path=this.getClass().getResource("/").getPath()+"com/yaspeed/document/template/blackListExcel.xlsx";
        try {
            File file = new File(path);
            HttpHeaders headers = new HttpHeaders();    
            String fileName=new String("黑名单导入模板.xlsx".getBytes(), "ISO8859-1");//为了解决中文名称乱码问题  
            headers.setContentDispositionFormData("attachment", fileName);   
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);   
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),    
                                              headers, HttpStatus.CREATED);
        } catch (Exception e) {
            e.printStackTrace();
            if(log.isInfoEnabled()){
                log.info("黑名单模板下载异常，path="+path);
            }
        }    
        return null;
    }     
    
    
    
    
}