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。


   

   





                                    




        

	      

	    

	  

	  

	    
      
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          原文地址：https://www.cnblogs.com/jatpeo/p/11767554.html