java文件下载方式二（支持在线打开）

package com.hui10.app.controller.merchant;




import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.OutputStream;
import java.net.URL;


import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.hui10.app.common.web.BaseController;


@Controller
public class TestController extends BaseController {

/**
* 测试文件下载
* @throws Exception 
* @throws FileNotFoundException 
*/
@RequestMapping(value = "/testhh/download", produces = { "application/json;charset=UTF-8" }, method = RequestMethod.GET)
@ResponseBody
public ModelAndView downloadFile(HttpServletResponse response) throws Exception   {
downLoad("D://timg.jpg",response,true);
return null;
}


public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {
        File f = new File(filePath);
        if (!f.exists()) {
            response.sendError(404, "File not found!");
            return;
        }
        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
        byte[] buf = new byte[1024];
        int len = 0;
 
        response.reset(); // 非常重要
        if (isOnLine) { // 在线打开方式
            URL u = new URL("file:///" + filePath);
            response.setContentType(u.openConnection().getContentType());
            response.setHeader("Content-Disposition", "inline; filename=" + f.getName());
            // 文件名应该编码成UTF-8
        } else { // 纯下载方式
            response.setContentType("application/x-msdownload");
            response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());
        }
        OutputStream out = response.getOutputStream();
        while ((len = br.read(buf)) > 0)
            out.write(buf, 0, len);
        br.close();
        out.close();
}

}

浏览器输入测试地址，结果如下：

参考地址：https://blog.****.net/pangqiandou/article/details/53234586