Struts2文件上传与下载-优快云博客

本文介绍了一个基于Struts2框架实现的简单文件上传和下载功能。通过配置拦截器来限定上传文件类型及大小，并使用自定义Action处理文件的上传与下载过程。该示例展示了如何设置上传路径、读取并保存文件，以及如何配置Struts2进行文件下载。

//文件上传
package com.bochy.action;

import java.io.File;
import java.io.FileInputStream;
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 {

	//上转文件
	private File image;
	
	//
	private String imageFileName;
	
	//
	private String imageContentType;
	
	//
	private String savePath;
	
	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;
	}

	public String getSavePath() {
		return savePath;
	}

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

	public String execute() throws Exception {
		//指定上转文件路径
        String path=ServletActionContext.getServletContext().getRealPath("/img");
        savePath="img/"+this.getImageFileName();
        //System.out.println("path="+path);
        //System.out.println("savePath="+savePath);
        InputStream is=new FileInputStream(image);
        File tofile=new File(path,this.getImageFileName());
        OutputStream os=new FileOutputStream(tofile);
        byte[] buffer=new byte[1024];
        int len=0;
        while((len=is.read(buffer))>0){
        	os.write(buffer, 0, len);
        }
        is.close();
        os.close();
        return SUCCESS;
	}
}
//文件下载
package com.bochy.action;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DownAction extends ActionSupport{
   
    private String inputPath="img/c2cec3fdfc0392454814f8188494a4c27d1e2507.jpg";

    public InputStream getTargetFile(){
    	InputStream is=ServletActionContext.getServletContext().getResourceAsStream(inputPath);
        return is;
    }
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		return SUCCESS;
	}
}

//Struts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>
    <package name="file" extends="struts-default">
       <action name="fileaction" class="com.bochy.action.UploadAction">
       <result name="success">/success.jsp</result>
       <result name="input">/fileupordown.jsp</result>
       <interceptor-ref name="fileUpload">
       <param name="alloweTypes">image/bmp,image/jpg,image/png,image/gif,image/jpeg</param>
       <param name="maximumSize">5000000</param>
       </interceptor-ref>
       <interceptor-ref name="defaultStack"></interceptor-ref>
       </action>
       
       <action name="downaction" class="com.bochy.action.DownAction">
       <result name="success" type="stream">
       <param name="inputPath">img/c2cec3fdfc0392454814f8188494a4c27d1e2507.jpg</param>
       <param name="contentType">image/bmp,image/jpg,image/png,image/gif,image/jpeg</param>
       <param name="inputName">targetFile</param>
       <param name="contentDisposition">attachement;filename="mary.jpg"</param>
       <param name="bufferSize">5000000</param>
       </result>
       </action>
    </package>
</struts>

//jsp页面
<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
<s:form action="fileaction.action" method="post" enctype="multipart/form-data">
<s:file name="image" label="上转文件"></s:file>
<s:submit value="上转"></s:submit>
</s:form>
<a href="downaction.action">下载文件</a>
</body>
</html>