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>