struts2文件上传（多文件）文件下载

一文件上传

1.环境要求

commons-fileupload-xxx.jar

commons-io-xxx.jar

2.准备jsp页面

单

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ 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=UTF-8">

<title>Insert title here</title>

</head>

<body>

<s:form action="Fileupload" method="" enctype="multipart/form-data">

<s:textfield name="title" label="用户名"/><br>

<s:file name="upload" label="上传文件"/><br>

<s:submit name="submit" value="上传" />

</s:form>

</body>

</html>

多

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ 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=UTF-8">

<title>Insert title here</title>

</head>

<body>

<s:form action="FileuploadMore" method="post" enctype="multipart/form-data">

<s:textfield name="title" label="用户名"/><br>

<s:file name="upload" label="上传文件"/><br>

<s:file name="upload" label="上传文件"/><br>

<s:file name="upload" label="上传文件"/><br>

<s:file name="upload" label="上传文件"/><br>

<s:submit name="submit" value="上传" />

</s:form>

</body>

</html>

3.Action页面

单

package com.icss.action.upload;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**

***************************

*@类名  UploadAction.java

public class UploadAction extends ActionSupport{

	//1.普通字段name属性名

	private String title;

	private File upload;//file 控件名           它要和表单name属性和action属性名要一致

	//2.控件名+ContentType

	private String uploadContentType;//上传文件的类型

	//3.控件名+FileName

	private String uploadFileName;//上传文件的名称

	//4.上传文件的路径 upload

	private String savePath; //获取完整的路径

	//上传

	public String execute() throws Exception {

		byte[] buffer = new byte[2048];//缓冲区

		//输入流

		FileInputStream fis = new FileInputStream(upload);

		//输出流   \ \

		FileOutputStream fos = new FileOutputStream(getSavePath()+"\\"+uploadFileName);

		int len=fis.read(buffer);

		while(len>0){

			fos.write(buffer, 0, len);

			len=fis.read(buffer);

		}

		fos.flush();

		fos.close();

		fis.close();

		return "success";

	}

	//生成get和set方法

	public String getTitle() {

		return title;

	}

	public void setTitle(String title) {

		this.title = title;

	}

	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 ServletActionContext.getServletContext().getRealPath(savePath);

	}

	public void setSavePath(String savePath) {

		this.savePath = savePath;

	}

}

多

public class UploadMoreAction extends ActionSupport{

	//file 控件  name 属性和action属性名要一致

	//1.普通字段name属性名

	private String title;

	private File[] upload;

	//2.控件名+ContentType

	private String[] uploadContentType;//上传文件的类型

	//3.控件名+FileName

	private String[] uploadFileName;//上传文件的名称

	//4.上传文件的路径 upload

	private String savePath; //获取完整的路径

	//上传

	public String execute() throws Exception {

		byte[] buffer = new byte[2048];//缓冲区

		for(int i=0;i<upload.length;i++){

			//输入流

			FileInputStream fis = new FileInputStream(upload[i]);

			//输出流   \ \

			FileOutputStream fos = new FileOutputStream(getSavePath()+"\\"+uploadFileName[i]);

			int len=fis.read(buffer);

			while(len>0){

				fos.write(buffer, 0, len);

				len=fis.read(buffer);

			}

			fos.flush();

			fos.close();

			fis.close();

		}

		return "success";

	}

	public String getTitle() {

		return title;

	}

	public void setTitle(String title) {

		this.title = title;

	}

	public String getSavePath() {

		return ServletActionContext.getServletContext().getRealPath(savePath);

	}

	public void setSavePath(String savePath) {

		this.savePath = savePath;

	}

	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;

	}

4.配置struts.xml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="false"/>

  	<constant name="struts.enable.DynamicMethodInvocation" value="true"/>

  	<constant name="struts.configuration.xml.reload" value="true"/>

	<package name="upload" namespace="/" extends="struts-default">

	<!-- 单文件上传 -->

	<action name="Fileupload" class="com.icss.action.upload.UploadAction">

		<param name="savePath">/upload</param>

		<result name="success">/upload_success.jsp</result>

	</action>

	<!-- 多文件上传配置 -->

	<action name="FileuploadMore" class="com.icss.action.upload.UploadMoreAction">

		<param name="savePath">/upload</param>

		<result name="success">/upload_success.jsp</result>

	</action>

	<!-- 下载文件 -->

	<action name="download" class="com.icss.action.upload.downloadAction">

			<param name="inputPath">/upload</param>

			<result name="success" type="stream">

				<param name="contentType">application/octet-stream</param>

				<param name="inputname">inputStream</param>

				<param name="contentDisposition">

					attachment;filename="${fileName}"

				</param>

				<param name="bufferSize">4096</param>

			</result>

		</action>

	</package>

</struts>

File类型的xxx属性，与表单中的File控件的name属性一致，用于封装File控件对应的文件内容

String类型的xxxFileName属性，该属性名称就是前面的File类型属性+FileName组合而成，是固定的语法，作用就是封装File控件对应文件的文件名

String类型的xxxContentType属性，同样也是xxx属性+ContentType组合而成，固定语法，作用就是封装File控件对应文件的文件类型

在Action中设置了这三个属性，在执行上传时就可以直接通过getXxx()方法来获取到上传文件的文件名、类型及文件内容。

而实现文件上传的过程就是使用流实现文件读取的过程，

二文件下载

jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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=UTF-8">

<title>Insert title here</title>

</head>

<body>

<a href="download?fileName=head.jpg">下载此图片</a>

</body>

</html>

2.Action

public class downloadAction extends ActionSupport {

	//下载路劲

	private String inputPath;

	//下载文件名

	private String fileName;

	//读取下载文件的流

	private InputStream inputname;

	//获取输入流

	public InputStream getInputName() throws FileNotFoundException {

		String path = ServletActionContext.getServletContext().getRealPath(inputPath);

		return new BufferedInputStream(new FileInputStream(path+"\\"+fileName));

	}

	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 void setInputName(InputStream inputName) {

		this.inputname = inputName;

	}

	public String execute() throws Exception {

		return SUCCESS;

	}

}

struts.xml在上面。

巴特西

struts2文件上传（多文件）文件下载

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