Struts2 上传和下载功能

DowloadAction Action类

package action;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DowloadAction extends ActionSupport {
	//读取下载文件的目录
	private String inputPath;
	//下载文件的文件名
	private String fileName;
	//读取下载文件的输入流
	private InputStream inputStream;
	public String getInputPath() {
		return inputPath;
	}
	public void setInputPath(String inputPath) {
		this.inputPath = inputPath;
	}
	public String getFileName() {
		return fileName;
	}
	public void setFileName(String fileName) {
		this.fileName = fileName;
	}
	public InputStream getInputStream() {
		//从下载里面获取指定的文件名  upload /123.jpg
		String path=ServletActionContext.getServletContext().getRealPath(inputPath);
		String loaction=path+"/"+fileName;
		BufferedInputStream bis=null;
		try {
			FileInputStream fis=new FileInputStream(loaction);
			bis=new BufferedInputStream(fis);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		return bis;
	}
	public void setInputStream(InputStream inputStream) {
		this.inputStream = inputStream;
	}
	@Override
	public String execute() throws Exception {
		return SUCCESS;
	}
}

UploadAction Action类

package action;

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

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
	private static final long serialVersionUID = 1L;
	private String username;
	private File upload;
	//获取提交的文件类型
	private String uploadContentType;
	//封装上传文件名称
	private String uploadFileName;
	//获取文件上传的路径 upload文件夹
	private String savePath;
	@Override
	public String execute() throws Exception {
		//空杯子
		byte[] buff=new  byte[1000];
		//文件保存文件
		String path=ServletActionContext.getServletContext().getRealPath(savePath);
		System.out.println(path);
		String loaction=path+"/"+uploadFileName;
		//空瓶子
		FileOutputStream fos=new FileOutputStream(loaction);
		//循环读取文件，并且写入到fos
		//大可乐瓶子
		FileInputStream fis=new FileInputStream(upload);
		int lenght=fis.read(buff);
		while(lenght>0){
			fos.write(buff, 0, lenght);
			lenght=fis.read(buff);
		}
		//关闭资源
		fis.close();
		fos.close();
		return SUCCESS;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public File getUpload() {
		return upload;
	}
	public void setUpload(File upload) {
		this.upload = upload;
	}
	public String getUploadContentType() {
		return uploadContentType;
	}
	public void setUploadContentType(String uploadContentType) {
		this.uploadContentType = uploadContentType;
	}
	public String getUploadFileName() {
		return uploadFileName;
	}
	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}
	public String getSavePath() {
		return savePath;
	}
	public void setSavePath(String savePath) {
		this.savePath = savePath;
	}
}

配置 struts.xml

<?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="default" namespace="/" extends="struts-default">
		<action name="upload" class="action.UploadAction">
			<param name="savePath">upload</param>
			<result name="success">uploadSuccess.jsp</result>
		</action>
		<action name="download" class="action.DowloadAction">
			<param name="inputPath">upload</param>
			<result name="success" type="stream">
				<param name="contentType">image/pjpeg</param>
				<param name="inputName">inputStream</param>
				<param name="contentDisposition">attachment;filename="${fileName}"</param>
				<param name="bufferSize">4096</param>
			</result>
		</action>
	</package>
</struts>

upload.jsp 页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
	<form action="upload.action" method="post"
		enctype="multipart/form-data">
		用户名 <input type="text" name="username" /> <br /> 图片 <input
			type="file" name="upload" /> <br /> <input type="submit" value="提交" />
	</form>
</body>
</html>

uploadSuccess.jsp 页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
	<h4>
		上传成功，你传的文件名称是：
		<s:property value="uploadFileName" />
	</h4>
	<h4>
		<s:property value="username" />
		传的文件类型是
		<s:property value="uploadContentType" />
	</h4>
</body>
</html>

index.jsp 页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
	<h4>This is Index Page</h4>
	<a href="download.action?fileName=123.jpg">下载123.jpg</a>
</body>
</html>

效果图：