1.采用xml方式的实现：
1）Action：
package frontview.download.action;
import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import model.FileInfo;
import org.apache.struts2.ServletActionContext;
import common.BaseAction;
import constant.Constant;
import frontview.download.service.IFrontDownloadService;
/**
* 软件下载Action
*
* @author heweina frontview.download.action.SoftwareDownloadAction.java
* 2011-5-5 下午12:59:07
*/
public class SoftwareDownloadAction extends BaseAction {
/**
*
*/
private static final long serialVersionUID = 1L;
private IFrontDownloadService frontDownloadService;
//服务器端文件名
private String fileName;
//下载类型
private String type;
//浏览器类型
private String brower;
public IFrontDownloadService getFrontDownloadService() {
return frontDownloadService;
}
public void setFrontDownloadService(
IFrontDownloadService frontDownloadService) {
this.frontDownloadService = frontDownloadService;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getBrower() {
return brower;
}
public void setBrower(String brower) {
this.brower = brower;
}
/**
* 获取下载文件的输入流
* @return 下载文件的输入流
* @throws Exception
*/
public InputStream getInputStream() throws Exception {
//真实路径
String realPath = Constant.FILEFOLODER + fileName;
InputStream in = null;
try{
in = ServletActionContext.getServletContext().getResourceAsStream(realPath);
}catch(Exception ex){
}
return in;
}
/**
* 获取下载文件显示名称（客户端名称）
* @return 下载文件显示名称
* @throws Exception
*/
public String getDownloadFileName() throws Exception {
String fileID = request.getParameter("fileID");
FileInfo fileInfo = frontDownloadService.getFileClientNameByID(fileID);
String downFileName = fileInfo.getFileClientName()+"."+fileInfo.getFileSuffix();
try{
//IE浏览器
if("IE".equals(brower)){
downFileName = java.net.URLEncoder.encode(downFileName,"UTF-8");
}else
downFileName = new String(downFileName.getBytes(), "ISO8859-1");
} catch (UnsupportedEncodingException e) {
}
return downFileName;
}
@Override
public String execute() throws Exception {
String forward = null;
//真实路径
String realPath = Constant.FILEFOLODER + fileName;
String filePath = ServletActionContext.getServletContext().getRealPath(realPath);
//文件不存在
if(!new File(filePath).exists()){
//全部列表下载
if("page".equals(type)){
forward = "fileNotFound";
}
//首页前六条下载
if("first".equals(type)){
forward = ERROR;
}
}else{
forward = SUCCESS;
}
return forward;
}
}
?
2）struts.xml
<!-- 软件下载 -->
<action name="softwareDownload" class="frontview.download.action.SoftwareDownloadAction">
<param name="inputPath">/upload/unknown.doc</param>
<!-- 初始文件名 -->
<param name="fileName">unknown.doc</param>
<result name="success" type="stream">
<!-- 指定下载文件的文件类型,设置输出的类型为二进制流 -->
<param name="contentType">application/octet-stream;charset=ISO8859-1</param>
<!-- 指定下载文件的文件位置 -->
<param name="inputName">inputStream</param>
<!-- 使用经过转码的文件名作为下载文件名，downloadFileName属性 对应action类中的方法 getDownloadFileName() -->
<param name="contentDisposition">attachment;filename="${downloadFileName}"</param>
<!-- 输出时缓冲区的大小 -->
<param name="bufferSize">4096</param>
</result>
<result name="fileNotFound">/frontview/download/fileNotFind.jsp</result>
<result name="error">/frontview/download/tip.jsp</result>
</action>
?
?2.注解方式：
1）Action：
/**
* Copyright (C), 2011-2012, beijing ow Co., Ltd.
* 文件名: FileDownloadAction.java
*/
package com.ow.ovmweb.plugins.servicemanage.servicebrowse.action;
import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import javax.annotation.Resource;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.stereotype.Component;
import com.ow.core.common.BaseAction;
import com.ow.ovmweb.plugins.servicemanage.servicebrowse.model.ServiceQueryCondition;
import com.ow.ovmweb.plugins.servicemanage.servicebrowse.service.IServiceManageService;
import com.ow.tools.PropertiesTools;
/**
* 类描述: 文件下载的Action
* 修改历史:
* @author heweina
* @version 1.0
* @date 2011-12-1 下午09:53:46
* @description
* 其它:
*/
@Component
public class FileDownloadAction extends BaseAction {
/**
*/
private static final long serialVersionUID = 1L;
@Resource
private IServiceManageService serviceManageService;
private ServiceQueryCondition queryCondition;
//当前页数
private int curpager;
//服务器端文件名
private String fileName;
private String orgID;
private String serviceID;
//浏览器类型
private String brower;
public IServiceManageService getServiceManageService() {
return serviceManageService;
}
public void setServiceManageService(IServiceManageService serviceManageService) {
this.serviceManageService = serviceManageService;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public String getBrower() {
return brower;
}
public void setBrower(String brower) {
this.brower = brower;
}
public ServiceQueryCondition getQueryCondition() {
return queryCondition;
}
public void setQueryCondition(ServiceQueryCondition queryCondition) {
this.queryCondition = queryCondition;
}
public int getCurpager() {
return curpager;
}
public void setCurpager(int curpager) {
this.curpager = curpager;
}
public String getOrgID() {
return orgID;
}
public void setOrgID(String orgID) {
this.orgID = orgID;
}
public String getServiceID() {
return serviceID;
}
public void setServiceID(String serviceID) {
this.serviceID = serviceID;
}
/**
* 获取下载文件的输入流
* @return 下载文件的输入流
* @throws Exception
*/
public InputStream getInputStream() throws Exception {
//真实路径
String fileFolder = PropertiesTools.getValue("com/ow/ovmweb/global/constant.properties", "fileFolder");
String filePath = fileFolder+File.separator+fileName;
InputStream in = null;
try{
in = ServletActionContext.getServletContext().getResourceAsStream(filePath);
}catch(Exception ex){
}
return in;
}
/**
* 获取下载文件显示名称（客户端名称）
* @return 下载文件显示名称
* @throws Exception
*/
public String getDownloadFileName() throws Exception {
String downFileName = fileName;
try{
//IE浏览器
if("IE".equals(brower)){
downFileName = java.net.URLEncoder.encode(downFileName,"UTF-8");
}else
downFileName = new String(downFileName.getBytes(), "ISO8859-1");
} catch (UnsupportedEncodingException e) {
}
return downFileName;
}
@Override
@Action(value="fileDownload",results={
@Result(name=SUCCESS, type="stream", params={"contentType","application/octet-stream;charset=ISO8859-1","inputName","inputStream",
"contentDisposition","attachment;filename=\"${downloadFileName}\"","bufferSize","4096"}),
@Result(name="fileNotFound", location="/pages/servicemanage/servicebrowse/tip.jsp")
})
public String execute() throws Exception {
String forward = null;
String fileFolder = PropertiesTools.getValue("com/ow/ovmweb/global/constant.properties", "fileFolder");
String filePath = ServletActionContext.getServletContext().getRealPath("")+File.separator+fileFolder+File.separator+fileName;
//文件不存在
if(!new File(filePath).exists()){
forward = "fileNotFound";
}else{
forward = SUCCESS;
}
return forward;
}
}
?注意：执行过程中可能会出现如下错误：
?不是inputName配置的方法找不到，而是其中的getInputStream()方法 中的代码出现了异常，可以通过 System.out.println(in);
打印出输入流，如果为NULL的话，说明realPath路径正确，否则是这个流的realPath路径错误。