Struts2：单个文件上传的两种实现方式

通过2种方式模拟单个文件上传，效果如下所示

开发步骤如下：

1、新建一个web工程，导入struts2上传文件所需jar，如下图

目录结构

2、新建Action

第一种方式

复制代码代码如下:

package com.ljq.action;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class UploadAction extends ActionSupport{

    private File image; //上传的文件
    private String imageFileName; //文件名称
    private String imageContentType; //文件类型

    public String execute() throws Exception {
        String realpath = ServletActionContext.getServletContext().getRealPath("/images");
        //D:\apache-tomcat-6.0.18\webapps\struts2_upload\images
        System.out.println("realpath: "+realpath);
        if (image != null) {
            File savefile = new File(new File(realpath), imageFileName);
            if (!savefile.getParentFile().exists())
                savefile.getParentFile().mkdirs();
            FileUtils.copyFile(image, savefile);
            ActionContext.getContext().put("message", "文件上传成功");
        }
        return "success";
    }

    public File getImage() {
        return image;
    }

    public void setImage(File image) {
        this.image = image;
    }

    public String getImageFileName() {
        return imageFileName;
    }

    public void setImageFileName(String imageFileName) {
        this.imageFileName = imageFileName;
    }

    public String getImageContentType() {
        return imageContentType;
    }

    public void setImageContentType(String imageContentType) {
        this.imageContentType = imageContentType;
    }

    
}

第二种方式

复制代码代码如下:

package com.ljq.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class UploadAction2 extends ActionSupport {

    // 封装上传文件域的属性
    private File image;
    // 封装上传文件类型的属性
    private String imageContentType;
    // 封装上传文件名的属性
    private String imageFileName;
    // 接受依赖注入的属性
    private String savePath;

    @Override
    public String execute() {
        FileOutputStream fos = null;
        FileInputStream fis = null;
        try {
            // 建立文件输出流
            System.out.println(getSavePath());
            fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName());
            // 建立文件上传流
            fis = new FileInputStream(getImage());
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = fis.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
        } catch (Exception e) {
            System.out.println("文件上传失败");
            e.printStackTrace();
        } finally {
            close(fos, fis);
        }
        return SUCCESS;
    }

    /**
     * 返回上传文件的保存位置
     * 
     * @return
     */
    public String getSavePath() throws Exception{
        return ServletActionContext.getServletContext().getRealPath(savePath); 
    }

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

    public File getImage() {
        return image;
    }

    public void setImage(File image) {
        this.image = image;
    }

    public String getImageContentType() {
        return imageContentType;
    }

    public void setImageContentType(String imageContentType) {
        this.imageContentType = imageContentType;
    }

    public String getImageFileName() {
        return imageFileName;
    }

    public void setImageFileName(String imageFileName) {
        this.imageFileName = imageFileName;
    }

    private void close(FileOutputStream fos, FileInputStream fis) {
        if (fis != null) {
            try {
                fis.close();
            } catch (IOException e) {
                System.out.println("FileInputStream关闭失败");
                e.printStackTrace();
            }
        }
        if (fos != null) {
            try {
                fos.close();
            } catch (IOException e) {
                System.out.println("FileOutputStream关闭失败");
                e.printStackTrace();
            }
        }
    }

}

struts.xml配置文件

复制代码代码如下:

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

         
   
       
            /WEB-INF/page/message.jsp
       
   

   
       
           
            /images
            /WEB-INF/page/message.jsp
            /upload/upload.jsp
           
               
                image/bmp,image/png,image/gif,image/jpeg
               
                1025956
           
           
           
       
   

上传表单页面

复制代码代码如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s" %>

   
       

       
       
       
   

   
       
       
       

              enctype="multipart/form-data" method="post">
            文件:
               
       

       

       
   

显示结果页面

复制代码代码如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>


 

   

   
   
        
 

 
    上传成功！
   


   
    ">