wap 软件下载实现

对于wap页面下载软件记录下
URL要带文件名，否则手机不支持
例如：http://localhost:8080/client/test.CAB
symbian手机对于IP:8080/方式貌似不支持，需要http://域名:端口/client/test.CAB


下载方式可以有2种：
1)wap标签连接
<wall:a href="<%=filePath%>">download</wall:a>
2)servlet write文件流返回(字节流)
配置一个DownLoadServlet
web.xml:
<servlet>
        <servlet-name>downLoadClientServlet</servlet-name>
        <servlet-class>com.test.DownLoadServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
        <servlet-name>downLoadClientServlet</servlet-name>
        <url-pattern>/client/*</url-pattern>
</servlet-mapping>
DownLoadServlet:

public class DownLoadServlet extends HttpServlet {
    private GeneralLogger logger = LoggerFactory.getLogger(DownLoadServlet.class);

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        logger.debug("------------------------------------------------------------------------------------");

        try {              
                String filePath = "d:/mytest/client/test.CAB";

                logger.debug("filePath = " + filePath);

                sendReply(filePath, response);

        } catch (Exception e) {
            logger.error("error :" + e.toString());
        }
        logger.debug("------------------------------------------------------------------------------------");
    }

    public void sendReply(String filePath, HttpServletResponse response) {       
        File file = new File(filePath);
        if (file.exists()) {
            String fileName = file.getName();
            response.setContentType("application/x-download");//设置为下载application/x-download

            response.addHeader("Content-Disposition", "attachment;filename=" + fileName);

            OutputStream output = null;
            FileInputStream fis = null;
            try {
                output = response.getOutputStream();
                fis = new FileInputStream(filePath);

                byte[] b = new byte[1024];
                int i = 0;

                while ((i = fis.read(b)) != -1) {
                    output.write(b, 0, i);
                }
                output.flush();
                b = null;
            }
            catch (Exception e) {
                logger.error("error :" + e.toString());
            }
            finally {
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        //e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
                    }
                    fis = null;
                }
                if (output != null) {
                    try {
                        output.close();
                    } catch (IOException e) {
                        //e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
                    }
                    output = null;
                }
            }
        }
    }

}

顺便说下，第一种方式软件要放在web文件夹或子文件夹下，否则tomcat等容器是不允许访问的
第二种方式就比较灵活些，对于手机客户端软件升级，后台连接，可采用第二种方式。