struts2文件上传下载

之前没写过struts2上传下载，只是知道大概怎么搞，最近项目中用到，正巧赶上了，编码过程中遇到过一些问题，如上传文件类型，中文乱码，兼容性问题等，不过都一一解决了，下面附上自己的代码。以便将来查阅...

也希望这篇随便能够帮助很多朋友少走些弯路把！

1.文件上传

首先是jsp页面的代码

在jsp页面中定义一个上传标签

<tr>
     <td align="right" bgcolor="#F5F8F9"><b>附件：</b></td>
     <td bgcolor="#FFFFFF">
     <input type="file" name="upload" />
     </td>
     <td bgcolor="#FFFFFF">&nbsp;</td>
</tr>

然后是BaseAction中定义的相关属性其它的就省略了（也可定义在自己的Action，换下访问修饰符即可）

/**
*Action基类
**/
public class BaseAction extends ActionSupport {

    protected List<File> upload;
    protected List<String> uploadContentType; //文件类型
    protected List<String> uploadFileName;    //文件名
    protected String savePath;                //保存路径

}

然后是Action中的一个上传方法，代码如下：

　　/**
 2　　 * 8.上传附件
　　* @param upload
　　*/
　　public void uploadAccess(List<File> upload){
        try {
            if (null != upload) {
                for (int i = 0; i < upload.size(); i++) {
                    String path = getSavePath() + "\"+ getUploadFileName().get(i);
                    System.out.println(path);
                    item.setAccessory(getUploadFileName().get(i));
                    
                    FileOutputStream fos = new FileOutputStream(path);
                    FileInputStream fis = new FileInputStream(getUpload().get(i));
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    while ((len = fis.read(buffer)) > 0) {
                        fos.write(buffer, 0, len);
                    }
                    fis.close();
                    fos.close();
                }
            }
        } catch (Exception e) {
            logger.error("上传附件错误。", e);
        }
    }

接着是我的struts2.xml文件

<action name="itemRDAction_*" class="itemRDAction" method="{1}">
     <param name="savePath">e:upload</param>
     <interceptor-ref name="defaultStack">
           <param name="fileUpload.allowedTypes">
               application/octet-stream,image/pjpeg,image/bmp,image/jpg,image/png,image/gif,image/jpeg,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.ms-excel
           </param>
           <param name="fileUpload.maximumSize">8000000</param>
     </interceptor-ref>
     <result name="show_item_rd_upd">  /WEB-INF/jsp/page_item/updItem_rd.jsp</result>
     <result name="show_item_rd_list"> /WEB-INF/jsp/page_item/listItem_rd.jsp</result>
     <result name="show_item_rd_push"> /WEB-INF/jsp/page_item/pushItem_rd.jsp</result>
</action>

savePath为保存路径，fileUpload.allowedTypes 用来限制上传文件类型 fileUpload.maximumSize 文件大小限制

2.文件下载

首先是页面中的下载链接

<tr>
   <td width="20%" align="right" bgcolor="#F5F8F9"><b>附件：</b></td>
   <td width="40%" bgcolor="#FFFFFF">
   <div style="355px; float: left;">${item.accessory}</div>
       <c:if test="${!empty item.accessory}">
           <div class="btn_img" style="float: left;"><a style="color: black; text-decoration: none;" href="download.action?filename=${item.accessory}">下载</a></div>
       </c:if>
   </td>
   <td width="40%" bgcolor="#FFFFFF">&nbsp;</td>
</tr> 

接着是DownloadAction的代码：

/**
 * DownloadAction
 * 
 * @author zhaoxz
 * 
 */
@Controller("downloadAction")
@Scope("prototype")
public class DownloadAction extends BaseAction {

    /**
     * 
     */
    private static final long serialVersionUID = -4278687717124480968L;

    private static Logger logger = Logger.getLogger(DownloadAction.class);

    private String filename;
    private InputStream inputStream;
    private String savePath;
    private String mimeType;

    public InputStream getInputStream() {
        try {
            String path = getSavePath() + "//"+ new String(filename.getBytes("ISO8859-1"), "utf-8");
            System.out.println(path);
            mimeType = ServletActionContext.getServletContext().getMimeType(path)+ ";charset=UTF-8";
            inputStream = new FileInputStream(path);
            String agent = request.getHeader("USER-AGENT");
            System.out.println(agent);
            if (null != agent) {
                if (-1 != agent.indexOf("Firefox")) {// Firefox
                    mimeType = mimeType.replace("UTF-8", "ISO8859-1");
                } else {// IE7+ Chrome
                    System.out.println("IE,Chrome");
                    filename = new String(filename.getBytes("ISO8859-1"),"utf-8");
                    filename = java.net.URLEncoder.encode(filename, "UTF-8");
                }
            }
        } catch (Exception e) {
            logger.error("下载文件信息出错。", e);
        }
        if (null == inputStream) {
            System.out.println("getResource error");
        }
        return inputStream;
    }

    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }

    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }

    /*************************** get set ******************************/
    public String getSavePath() {
        return this.savePath;
    }

    public void setSavePath(String savePath) {
        this.savePath = savePath;
    }

    public String getFilename() {
        return filename;
    }

    public void setFilename(String filename) {
        this.filename = filename;
    }
}

然后是它的struts2.xml文件：

<action name="download" class="downloadAction">
    <param name="savePath">E:/upload</param>
    <result type="stream">
          <param name="contentType">${mimeType}</param>
          <param name="contentDisposition">attachment;filename="${filename}"</param>
          <param name="inputName">inputStream</param>
    </result>
</action>

下载的话注意下编码格式基本应该就没什么问题了..希望能帮的你们!本人年纪比较小是个小白...要学的东西很多，有什么需要改进的地方还请各位明示！在此谢过了。