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>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>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;
}
}