HttpServletRequest和HttpServletResponse

HttpServletRequest

获取参数列表

request.getParameterMap(); 

获取路径中参数的值

Map< String, String>urlMap=(Map) request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);

获取请求的路径

request.getRequestURI().replace(request.getContextPath(), "");

HttpServletResponse

添加返回的文件

//添加文件名称
String name="悠果聚1.1"+".apk";
if(request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0){
    name = URLEncoder.encode(name, "UTF-8");//IE浏览器
   }else {
    name = new String(name.getBytes("UTF-8"), "ISO8859-1");//firefox浏览器||gool
}
    response.reset();//如果有换行，对于文本文件没有什么问题，但是对于其它格
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment;filename="+name);

写入文件流

方法一：
outputStream= response.getOutputStream();
/**
 * 将文件写到outputStream中
 * 
 * @param outputStream
 *            写入的outstream
 * @param localpath
 *            本地地址
 * @throws IOException
 */
private void getFile(OutputStream outputStream, String localpath)
        throws IOException {
    File file = new File(localpath);
    FileInputStream fileInputStream = null;
    fileInputStream = new FileInputStream(file);
    byte[] cotent = new byte[1024 * 1024];
    int readsize;
    boolean err = false;
    while ((readsize = fileInputStream.read(cotent)) != -1) {
        try {
            outputStream.write(cotent, 0, readsize);
        } catch (Exception e) {
            err = true;
            break;
        }
    }
    // 防止出现Connection reset by peer: socket write error
    // 出现这个原因是客户端的请求突然关闭引起的
    if (err) {
        // System.out.println("下载出错了哦");
        // outputStream.flush();
        // outputStream.close();
        fileInputStream.close();
        System.gc();
    } else {
        // System.out.println("下载没有错误");
        outputStream.flush();
        outputStream.close();
        fileInputStream.close();
    }
}
方法二：
response.getOutputStream().write(bytes);//将文件写入 response