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S10.1_Struts2_FileUpload_Download 文件上传与下载

2017-01-22 14:10 519 查看

我们接下来将要创建的项目目录结构如下：

net.nw.action

package net.nw.action;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport{
private static final long serialVersionUID = 1L;
private String downloadFile;
private String downloadFile_CN="范例.pdf";

public String getDownloadFile() {
return downloadFile;
}

public void setDownloadFile(String downloadFile) {
this.downloadFile = downloadFile;
}
public String getDownloadFile_CN() {
return downloadFile_CN;
}

public void setDownloadFile_CN(String downloadFile_CN) {
this.downloadFile_CN = downloadFile_CN;
}

public DownloadAction(){
System.out.println("构造方法DownloadAction ......");
}

//调用业务层操作类的方法
public String execute() throws Exception{
System.out.println("打印downloadFile："+downloadFile);
return SUCCESS;
}
public InputStream getTargetFile() throws Exception{
downloadFile_CN = new String(downloadFile_CN.getBytes(),"iso8859-1");
return ServletActionContext.getServletContext().getResourceAsStream(downloadFile);
}

}

package net.nw.action;

import net.nw.dao.UserDao;

import net.nw.vo.User;

//Action三种实现方式 1.具有public String execute()方法的普通类 <action name="login" class="net.nw.action.loginAction">

public class LoginAction {
private String username;//必须与html标签中的名称一样,此处私有变量的值直接来自html标签对应名称填充过来的值
private String password;//必须与html标签中的名称一样,此处私有变量的值直接来自html标签对应名称填充过来的值

public LoginAction(){
System.out.println("构造方法LoginAction ......");
}

public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

//调用业务层操作类的方法
public String execute(){
User u = new User();
u.setUsername(this.getUsername());
u.setPassword(this.getPassword());
UserDao dao = new UserDao();
if(dao.userLogin(u)){
return "login_success";
} else{
return "login_failure";
}
}

}

package net.nw.action;

import com.opensymphony.xwork2.Action;

import net.nw.dao.UserDao;

import net.nw.vo.User;

//Action三种实现方式 2.实现Action接口 <action name="login" class="net.nw.action.loginAction2">

public class LoginAction2 implements Action{
private String username;//必须与html标签中的名称一样,此处私有变量的值直接来自html标签对应名称填充过来的值
private String password;//必须与html标签中的名称一样,此处私有变量的值直接来自html标签对应名称填充过来的值

public LoginAction2(){
System.out.println("构造方法LoginAction2 ......");
}

public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

//调用业务层操作类的方法
public String execute(){
User u = new User();
u.setUsername(this.getUsername());
u.setPassword(this.getPassword());
UserDao dao = new UserDao();
if(dao.userLogin(u)){
return "login_success";
} else{
return "login_failure";
}
}

}

package net.nw.action;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

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 File photo;//上传文件
private String photoFileName;//上传文件的文件名
private String photoContentType; //上传文件的文件类型
private String savePath;//上传文件的保存目录

public File getPhoto() {
return photo;
}
public void setPhoto(File photo) {
this.photo = photo;
}
public String getPhotoFileName() {
return photoFileName;
}
public void setPhotoFileName(String photoFileName) {
this.photoFileName = photoFileName;
}

public String getPhotoContentType() {
return photoContentType;
}
public void setPhotoContentType(String photoContentType) {
this.photoContentType = photoContentType;
}
public String getSavePath() {
return savePath;
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
public UploadAction(){
System.out.println("构造方法UploadAction ......");
}

//调用业务层操作类的方法
public String execute() throws Exception{
System.out.println("执行上传execute() ......");
//1.获取上传后文件的真实目录
String path = ServletActionContext.getServletContext().getRealPath("/upload");

System.out.println(path);
//2.获得上传文件的真实路径
String f_name = path + File.separator + this.getPhotoFileName();
System.out.println(f_name);
//3.创建输入和输出流
BufferedInputStream bis = null;
BufferedOutputStream bos = null;

try{
bis = new BufferedInputStream(new FileInputStream(photo));
bos = new BufferedOutputStream(new FileOutputStream(new File(f_name)));

byte[] buff = new byte[(int)photo.length()];
int len=0;
while((len=bis.read(buff))!=-1){
bos.write(buff,0,len);
}
}catch(Exception ex){
ex.printStackTrace();
}finally{
try{
if(bis!=null){
bis.close();
bis = null;
}
if(bos!=null){
bos.close();
bos = null;
}
}catch(Exception ex){
ex.printStackTrace();
}
}
return SUCCESS;
}

}

package net.nw.dao;

import net.nw.vo.User;

//用户操作类

public class UserDao {
public boolean userLogin(User u){

if(!u.getUsername().equals("") && u.getPassword().equals("123456")){
return true;
} else {
return false;
}
}

}

package net.nw.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import net.nw.dao.UserDao;

import net.nw.vo.User;

/**

* Servlet implementation class loginServlet

*/

public class loginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**

* @see HttpServlet#HttpServlet()

*/

public loginServlet() {

super();

// TODO Auto-generated constructor stub

}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
User u = new User();
u.setUsername(request.getParameter("username"));
u.setPassword(request.getParameter("password"));
UserDao dao = new UserDao();
if(dao.userLogin(u)){
response.sendRedirect("login_success.jsp");
}else{
response.sendRedirect("login_failure.jsp");
}
}

}

package net.nw.vo;

//用户类

public class User {

private String username;//用户名称
private String password;//用户密码

public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

}

<?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="true" ></constant>

<constant name="struts.i18n.encoding" value="utf-8" ></constant>

<constant name="struts.multipart.maxSize" value="31457280" ></constant>

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

<action name="upload" class="net.nw.action.UploadAction">

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

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

<result name="input">/upload.jsp</result>

<interceptor-ref name="defaultStack">

<param name="fileUpload.maximumSize">

31457280

</param>

<param name="fileUpload.allowedTypes">

image/gif,image/jpeg,application/msword,application/pdf,application/octet-stream

</param>

</interceptor-ref>

</action>

<action name="download" class="net.nw.action.DownloadAction">



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

<param name="inputName">targetFile</param>

<param name="contentDisposition">attachment;filename="${downloadFile_CN}"</param>

<param name="contentType">application/octet-stream;charset=ISO8859-1</param>

</result>

</action>

</package>

</struts>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

<welcome-file-list>

<welcome-file>upload.jsp</welcome-file>

</welcome-file-list>

<filter>

<filter-name>struts2</filter-name>

<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>struts2</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

download_success.jsp:

<%@ page language="java" import="java.util.*" %>

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

<%@ taglib uri="/struts-tags" prefix="s" %>

<%

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>下载成功</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>

<center>

<h1>下载成功</h1>

<hr>

</center>

</body>

</html>

upload_success.jsp:

<%@ page language="java" import="java.util.*" %>

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

<%@ taglib uri="/struts-tags" prefix="s" %>

<%

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>上传成功</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>

<center>

<h1>上传成功</h1>

<hr>

<s:url var="photo_url" value="view_photo.jsp">

<s:param name="filename" value="%{savePath+'/'+photoFileName}"/>

</s:url>

<s:property value="%{savePath+'/'+photoFileName}"/><br>

<s:a href="%{#photo_url}">查看</s:a>

<br>

<br>

<s:url var="down_url" value="download.action">

<s:param name="downloadFile" value="%{savePath+'/'+photoFileName}"/>

</s:url>

<s:a href="%{#down_url}">下载</s:a>

</center>

</body>

</html>

upload.jsp:

<%@ page language="java" import="java.util.*" %>

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

<%@ taglib uri="/struts-tags" prefix="s" %>

<%

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>文件上传</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>

<center>

<h1>文件上传</h1>

<hr>

<s:fielderror/>

<s:form name="testForm" action="upload" method="post" enctype="multipart/form-data">

<s:file name="photo" label="%{'请上传文件'}"></s:file>

<s:submit value="提交"/>

</s:form>

</center>

</body>

</html>

view_photo.jsp:

<%@ page language="java" import="java.util.*" %>

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

<%@ taglib uri="/struts-tags" prefix="s" %>

<%

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>查看图片</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>

<center>

<h1>查看图片</h1>

<hr>

<img src="${param.filename}"/>

<a href="<%=path%>/upload_success.jsp">返回</a>

</center>

</body>

</html>

测试效果截图如下：

本项目下载地址：点击打开链接

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