struts实现下载篇

下载:

java 代码

public class DownLoadAction extends Action {

    // --------------------------------------------------------- Instance
    // Variables
    BufferedInputStream bis = null;

    BufferedOutputStream bos = null;

    // --------------------------------------------------------- Methods

    /**
     * Method execute
     *
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return ActionForward
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        String downloadPath = servlet.getInitParameter("file-upload");
        String fileName = new String(request.getParameter("filename").getBytes(
                "ISO-8859-1"), "GB2312");
        response.reset();
        response.setContentType("application/x-msdownload");
        response.addHeader("Content-Disposition", "attachment;   filename=\""
                + new String(fileName.getBytes("GB2312"), "ISO-8859-1") + "\"");

        try {
            bis = new BufferedInputStream(new FileInputStream(downloadPath
                    + "/" + fileName));
            bos = new BufferedOutputStream(response.getOutputStream());

            byte[] buff = new byte[20480];
            while ((bis.read(buff, 0, buff.length)) != -1) {
                bos.write(buff, 0, buff.length);
            }
            bos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            bos.close();
            bis.close();
        }

        return mapping.findForward("downloadfile");
    }

}

web.xml

xml 代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/conf/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>config/login</param-name>
      <param-value>/WEB-INF/conf/login/struts-config-login.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>file-upload</param-name>
      <param-value>E:/upload</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>

  <filter>
    <filter-name>Set Character Encoding</filter-name>
    <filter-class>com.capinfo.filter.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>GB2312</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>Set Character Encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>


  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>



  <welcome-file-list>
    <welcome-file>/page/welcome.jsp</welcome-file>
  </welcome-file-list>

  <taglib>
    <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
    <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
  </taglib>
  <taglib>
    <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
    <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
  </taglib>
  <taglib>
    <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
    <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
  </taglib>
  <taglib>
    <taglib-uri>/WEB-INF/struts-template.tld</taglib-uri>
    <taglib-location>/WEB-INF/struts-template.tld</taglib-location>
  </taglib>
  <taglib>
    <taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
    <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
  </taglib>
  <taglib>
    <taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
    <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
  </taglib>

</web-app>

struts-config

xml 代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>

    <form-beans>
        <form-bean name="uploadForm" type="com.capinfo.form.upload.UploadForm" />
    </form-beans>

    <global-forwards>
        <forward name="welcome" path="/Welcome.do" />
        <forward name="login" contextRelative="true" path="/login/Login.do" redirect="true" />
        <forward name="upload" path="/page/upload.jsp" redirect="true"/>
    </global-forwards>

    <action-mappings>

        <action path="/Welcome" type="org.apache.struts.actions.ForwardAction" parameter="/page/Welcome.jsp"></action>

        <action path="/upload" type="com.capinfo.action.upload.UploadAction" name="uploadForm" input="/page/upload.jsp" scope="request">
            <forward name="success" path="/page/upload.jsp" />
        </action>

    <action path="/downLoad"
            type="com.yourcompany.struts.action.DownLoadAction"
            input="/page/upload.jsp"
            scope="request"
            >
        <forward name="downloadfile" path="/page/upload.jsp" />
    </action>

    </action-mappings>

    <message-resources parameter="com.yourcompany.struts.ApplicationResources" />

</struts-config>