Struts文件上传下载

Struts配置文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name="struts.devMode" value="true" />
    <constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
    <package name="default" extends="struts-default">
        <action name="upload" class="com.itheima.action.UploadAction" method="upload">
            <result>/1.jsp</result>
            <result name="input">/upload.jsp</result>
            <result name="error">/error.jsp</result>
        </action>
        <action name="download" class="com.itheima.action.UploadAction" method="download">
            <result type="stream">
                <param name="contentType">application/octet-stream</param>
                <!-- 在配置文件中使用OGNL表达式 -->
                <param name="contentDisposition">attachment;filename=${@java.net.URLEncoder@encode(photoFileName,'UTF-8')}</param>
                <param name="inputName">myInputStream</param>
            </result>
        </action>
    </package>

</struts>

action方法：

 package com.itheima.action;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.OutputStream;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 public class UploadAction extends ActionSupport {
     private File photo;
     private String photoFileName;
     private String photoContentType;
     private InputStream myInputStream;

     public InputStream getMyInputStream() {
         return myInputStream;
     }

     public void setMyInputStream(InputStream myInputStream) {
         this.myInputStream = myInputStream;
     }

     public File getPhoto() {
         return photo;
     }

     public void setPhoto(File photo) {
         this.photo = photo;
     }

     public String getPhotoFileName() {
         return photoFileName;
     }

     public void setPhotoFileName(String photoFileName) {
         this.photoFileName = photoFileName;
     }

     public String getPhotoContentType() {
         return photoContentType;
     }

     public void setPhotoContentType(String photoContentType) {
         this.photoContentType = photoContentType;
     }

     public String download() throws FileNotFoundException{
         photoFileName = "整容广告.jpg";
         //就是myInputStream赋值
         String storeDirectory = ServletActionContext.getServletContext().getRealPath("/files/整容广告.jpg");
         myInputStream = new FileInputStream(storeDirectory);

         return SUCCESS;
     }
     public String upload(){
         try {
             InputStream in = new FileInputStream(photo);
             String storeDirectory = ServletActionContext.getServletContext().getRealPath("/files");
             OutputStream out = new FileOutputStream(storeDirectory+"/"+photoFileName);
             int len = -1;
             byte b[] = new byte[1024];
             while((len=in.read(b))!=-1){
                 out.write(b, 0, len);
             }
             in.close();
             out.close();
             return SUCCESS;
         }  catch (Exception e) {
             e.printStackTrace();
             return ERROR;
         }
     }
 }

jsp页面：

    <s:form action="upload" enctype="multipart/form-data">
        <s:file label="靓照" name="photo"></s:file>
        <s:submit value="上传"></s:submit>
    </s:form>