Struts2.0实现的文件上传（单附件和多附件）以及附件下载功能

最新推荐文章于 2017-10-10 11:58:50 发布

转载最新推荐文章于 2017-10-10 11:58:50 发布 · 3.1k 阅读

文章标签：

#struts #string #stylesheet #buffer #file #action

本文介绍如何使用Struts2框架实现文件的上传和下载功能，包括单文件和多文件上传的过程及代码实现，并展示了如何配置Struts2拦截器以支持文件上传。

--------------------------------------------------单附件上传：----------------------------------------------------------------

Action类：

package com.yourcompany.struts.uponloadfile;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport {
     private static final long serialVersionUID = 572146812454l ;
     private static final int BUFFER_SIZE = 16 * 1024 ;

     private File myFile;
     private String contentType;
     private String fileName;
     private String imageFileName;
     private String caption;

     public void setMyFileContentType(String contentType) {
         this .contentType = contentType;
    }
     //还有myFileContentType（上传文件的MIME类型）和myFileFileName（上传文件的文件名，该文件名不包括文件的路径）。因此，<s:file name="xxx" />
     //对应Action类里面的xxx、xxxContentType和xxxFileName三个属性。
     public void setMyFileFileName(String fileName) {
         this .fileName = fileName;
    }

     public void setMyFile(File myFile) {
         this .myFile = myFile;
    }

     public String getImageFileName() {
         return imageFileName;
    }

     public String getCaption() {
         return caption;
    }

      public void setCaption(String caption) {
         this .caption = caption;
    }

     private static void copy(File src, File dst) {
         try {
            InputStream in = null ;
            OutputStream out = null ;
             try {
            //输入到缓冲流
                in = new BufferedInputStream( new FileInputStream(src), BUFFER_SIZE);
                out = new BufferedOutputStream( new FileOutputStream(dst), BUFFER_SIZE);
                 byte [] buffer = new byte [BUFFER_SIZE];
                 while (in.read(buffer) > 0 ) {
                    out.write(buffer);
                }
             } finally {
                 if ( null != in) {
                    in.close();
                }
                  if ( null != out) {
                    out.close();
                }
            }
         } catch (Exception e) {
            e.printStackTrace();
        }
    }

     private static String getExtention(String fileName) {
         int pos = fileName.lastIndexOf( "." );
         return fileName.substring(pos+1);//获得后缀名
    }

    @Override
     public String execute()      {
        imageFileName = new Date().getTime() + getExtention(fileName);//合成图片的名称
        System.out.println("================="+imageFileName+"========="+ServletActionContext.getServletContext().getRealPath("WebRoot/UploadImages" ));
        File imageFile = new File(ServletActionContext.getServletContext().getRealPath( "/UploadImages") + "/" +imageFileName);
        copy(myFile, imageFile);
         return SUCCESS;
    }
}

struts.xml配置：

<action name ="fileUpload" class ="com.yourcompany.struts.uponloadfile.FileUploadAction" >

              <interceptor-ref name ="fileUpload" >
                <param name ="allowedTypes" >
                   image/bmp,image/png,image/gif,image/jpeg
                </param >
            </interceptor-ref >
            

            <interceptor-ref name ="defaultStack" />
            <result name="input">/uploadfile_index.jsp</result >
            <result name="success">/uploadfile_result.jsp </result >
        </action >

uploadfile_index.jsp：

jsp：

<%@ page language="java" import="java.util.*" pageEncoding="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>uploadfile_index.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="exires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    

</head>

<body>
    选择上传文件：类型是图片
<s:fielderror />
    <s:form action ="fileUpload" method ="POST" enctype ="multipart/form-data" >
        <s:file name ="myFile"   label ="Image File" />
        <s:textfield name ="caption" label ="Caption" />
        <s:submit />
    </s:form >

</body>
</html>

uploadfile_result.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="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>uploadfile_result.jsp</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>
<div style ="padding: 3px; border: solid 1px #cccccc; text-align: center" >
        <img src ='UploadImages/<s:property value ="imageFileName" /> ' />
        <br />
        <s:property value ="caption" />
    </div >

</body>
</html>

--------------------------------------------------多附件上传：----------------------------------------------------------------

Action类：

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class maxFileUploadAction extends ActionSupport {
     private static final long serialVersionUID = 572146812454l ;
     private static final int BUFFER_SIZE = 16 * 1024 ;

     private File[] uploads;
     private String[] uploadFileNames;
     private String[] uploadContentTypes;

     public File[] getUpload() { return this .uploads; }
      public void setUpload(File[] uploads) { this .uploads = uploads; }

      public String[] getUploadFileName() { return this .uploadFileNames; }
      public void setUploadFileName(String[] uploadFileName) { this .uploadFileNames = uploadFileName; }

      public String[] getUploadContentType() { return this .uploadContentTypes; }
      public void setUploadContentType(String[] uploadContentType) { this .uploadContentTypes = uploadContentType;
      }
     private static void copy(File src, File dst) {
         try {
            InputStream in = null ;
            OutputStream out = null ;
             try {
            //输入到缓冲流
                in = new BufferedInputStream( new FileInputStream(src), BUFFER_SIZE);
                out = new BufferedOutputStream( new FileOutputStream(dst), BUFFER_SIZE);
                 byte [] buffer = new byte [BUFFER_SIZE];
                 while (in.read(buffer) > 0 ) {
                    out.write(buffer);
                }
             } finally {
                 if ( null != in) {
                    in.close();
                }
                  if ( null != out) {
                    out.close();
                }
            }
         } catch (Exception e) {
            e.printStackTrace();
        }
    }

     private static String getExtention(String fileName) {
         int pos = fileName.lastIndexOf( "." );
         return fileName.substring(pos+1);//获得后缀名
    }

    @Override
     public String execute(){
    for(int i=0;i<3;i++){
       String imageFileName = new Date().getTime() +getExtention(uploadFileNames[i]);//合成图片的名称
        System.out.println("================="+imageFileName+"========="+ServletActionContext.getServletContext().getRealPath("WebRoot/UploadImages" ));
        File imageFile = new File(ServletActionContext.getServletContext().getRealPath( "/UploadImages") + "/" +imageFileName);
        copy(uploads[i], imageFile);
    }
         return SUCCESS;
    }
}

struts.xml配置：

<action name ="maxfileUpload" class ="com.yourcompany.struts.uponloadfile.maxFileUploadAction" >
<interceptor-ref name ="fileUpload" />

<interceptor-ref name ="defaultStack" />
<result name="success">/uploadfile_maxresult.jsp </result >
</action >

jsp：

uploadfile_maxindex.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="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>uploadfile_maxindex.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="exires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    

</head>

<body>
选择上传文件：不限类型
<s:form action ="maxfileUpload" method ="POST" enctype ="multipart/form-data" >
    <s:file label ="File (1)" name ="upload" />
    <s:file label ="File (2)" name ="upload" />
    <s:file label ="File (3)" name ="upload" />
    <s:submit />
</s:form >

</body>
</html>

uploadfile_maxresult.jsp

<%@ page language="java" import="java.util.*" pageEncoding="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>uploadfile_maxresult.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="exires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    

</head>

<body>
<h4>上传成功</h4>

</body>
</html>

--------------------------------------------------附件下载：----------------------------------------------------------------

Action类:

package com.yourcompany.struts.filedown;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;

public class Filedown implements Action {

private String fileName;// 初始的通过param指定的文件名属性

private String inputPath;// 指定要被下载的文件路径

public InputStream getInputStream() throws Exception {

// 通过 ServletContext，也就是application 来读取数据

return ServletActionContext.getServletContext().getResourceAsStream(inputPath);

}

public String execute() throws Exception {

return SUCCESS;

}

public void setInputPath(String value) {

inputPath = value;

}

public void setFileName(String fileName) {

this.fileName = fileName;

}

/** 提供转换编码后的供下载用的文件名 */

public String getDownloadFileName() {

String downFileName = fileName;

try {

downFileName = new String(downFileName.getBytes(), "ISO8859-1");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return downFileName;

}

struts.xml配置：

<action name="download3" class="com.yourcompany.struts.filedown.Filedown">
<param name="inputPath">/download/系统说明.doc</param>



<result name="success" type="stream">
<param name="contentType">application/octet-stream;charset=ISO8859-1</param>
<param name="inputName">inputStream</param>

<param name="contentDisposition">attachment;filename="${downloadFileName}"</param>
<param name="bufferSize">4096</param>
</result>
</action>

JSP:

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
    <title>filedown.jsp</title>

</head>
<body>

<a href=" <s:url value="download3.action"> <s:param name="fileName">系统说明.doc</s:param> </s:url>">download</a>

</body>
</html>