文件下載，文件名有中文及空格無法顯示問題

使用response.setHeader(“Content-Disposition”,”attachment;filename=”+fName)下載文件，
中文文件名無法顯示的問題及空格處理

**該問題解決重點在於這兩塊代碼**

//處理文件名有中文問題    
if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {
    file_name= URLEncoder.encode(fileName,"UTF-8");
} else {
    file_name= new String(fileName.getBytes(),"ISO-8859-1");
}


//最後加雙引號處理名稱中間有空格問題
response.setHeader("Content-Disposition","attachment;filename=\""+file_name+"\"");

代碼如下：

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

/**
 * @author ZhouMengShun
 */
@Controller
@RequestMapping("/demo")
public class DemoController {

    @RequestMapping(value = "download", method = RequestMethod.GET)
    public void downloadFile(HttpServletRequest request,HttpServletResponse response) {

        InputStream in = null;
        try {
            String fileName="測試文件.rar";//文件名稱
            File file = new File("c://"+fileName);//創建文件對象,假設該文件已存在，這裏不做判斷

            // 1.設置文件ContentType類型，這樣設置，會自動判斷下載文件類型
            response.setContentType("application/x-msdownload");
            //response.setContentType("multipart/form-data");//也可以這樣寫

            String file_name=null;

            //處理文件名有中文問題    
            if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {
                file_name= URLEncoder.encode(fileName,"UTF-8");
            } else {
                file_name= new String(fileName.getBytes(),"ISO-8859-1");
            }

            //最後加雙引號處理名稱中間有空格問題
            response.setHeader("Content-Disposition","attachment;filename=\""+file_name+"\"");

            in = new FileInputStream(file);

            // 3.通過response獲取ServletOutputStream對象(out)
            int b = 0;
            byte[] buffer = new byte[512];
            while (b != -1) {
                b = in.read(buffer);
                if (b != -1) {
                    response.getOutputStream().write(buffer, 0, b);// 4.寫到輸出流(out)中
                }
            }

        } catch (Exception e) {
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
                response.getOutputStream().flush();
            } catch (Exception ex) {
            }
        }
    }

}