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Struts2.0实现的文件上传(单附件和多附件)以及附件下载功能

2016-11-28 13:56 696 查看

  --------------------------------------------------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="timer"/>  用于测试action的执行时间 -->
          
            <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">  
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css">  
    -->  
  
  </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">  
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css">  
    -->  
  
  </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:

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.ArrayList;
 import java.util.Date;
import java.util.List;

 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 ="fileUploadStack" />  -->
  <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">  
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css">  
    -->  
  
  </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">  
    <!--  
    <link rel="stylesheet" type="text/css" href="styles.css">  
    -->  
  
  </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:


<!-- 下载现有文件 --> 
<action name="download3" class="com.yourcompany.struts.filedown.Filedown"> 
<param name="inputPath">/download/系统说明.doc</param> 
<!-- 初始文件名 --> 
<!-- 可以载页面传入 -->
<!-- <param name="fileName">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> 
<!-- 使用经过转码的文件名作为下载文件名,downloadFileName属性 
对应action类中的方法 getDownloadFileName() --> 
<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>

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