struts2中多文件上传的处理

来源：互联网发布：骑行眼镜知乎编辑：程序博客网时间：2024/05/16 17:08

在sturts2中的多个文件的上传处理，真是做到足够简单了，想以前阿堂都是在Servlet中用smartUpload.jar来进行手工处理二进制流，来多个文件的上传处理的。。struts2是在common-FileUpload和COS的文件上传解析器的基础上，再次进行了封装..，不能不说这是struts2的高明之处。。不过，struts2黙认使用的jakarta的Common-FileUpload的文件上传框架,如果需要使用struts2的文件上传功能，则需要在web应用中增加两个JAR文件，即commons-io.jar和commons-fileupload.jar文件。(如果需要使用其它的文件上传处理的框架，只需要在struts.xml文件中，配置struts.multipart.parser常量的值就可以了)

对于struts2中的多个文件的上传处理，可以有两种方式来处理，既可以用Array数组，也可以用List方式，基本上差不多，只是使用List<File>代替了File[]的操作.对于struts2而言，使用泛型限制的List与数组的作用几乎相同。因此strtus2可以将多个文件域的内容解析成三个List对象，一个用于封装多个文件，一个用于封装文件类型，一个用于封装多个文件内容

一.用Array数组方式来实现多个文件的上传

1.上传页面文件代码upload.jsp

<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title>使用数组上传多个文件</title>
</head>
<body>
<s:fielderror/>
<form action="upload.action" method="post" enctype="multipart/form-data">
   文件标题：<input type="text" name="title" /><br>
   选择第一个文件：<input type="file" name="upload" /><br>
   选择第二个文件：<input type="file" name="upload" /><br>
   选择第三个文件：<input type="file" name="upload" /><br>
<input value="上传" type="submit" />
</form>
</body>
</html>

2.显示结果页面代码succ.jsp

<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
    <head>
        <title>上传成功</title>
    </head>
    <body>
        上传成功!<br>
  文件标题:<s:property value="+ title"/><br>
  第一个文件为：<img src="<s:property value="'upload/' + uploadFileName[0]"/>"/><br>
  第二个文件为：<img src="<s:property value="'upload/' + uploadFileName[1]"/>"/><br>
  第三个文件为：<img src="<s:property value="'upload/' + uploadFileName[2]"/>"/><br>

</body>
</html>

3.处理的UploadAction.java

package com.ish.struts.action;

import org.apache.struts2.ServletActionContext;
import java.io.File;
import java.io.*;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport
{
private String title;
    private File[] upload;
    private String[] uploadContentType;
    private String[] uploadFileName;

//接受依赖注入的属性
    private String savePath;
//接受依赖注入的方法
    public void setSavePath(String value)
{
        this.savePath = value;
    }

    private String getSavePath() throws Exception
{
        return ServletActionContext.getRequest().getRealPath(savePath);
    }

public void setTitle(String title) {
  this.title = title;
}

public void setUpload(File[] upload) {
this.upload = upload;
}

public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}

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

public String getTitle() {
return (this.title);
}

public File[] getUpload() {
return (this.upload);
}

public String[] getUploadContentType() {
return (this.uploadContentType);
}

public String[] getUploadFileName() {
  return (this.uploadFileName);
}
@Override
    public String execute() throws Exception
{
  File[] files = getUpload();
  for (int i = 0 ; i < files.length ; i++)
  {
   //以服务器的文件保存地址和原文件名建立上传文件输出流
   FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getUploadFileName()[i]);
   FileInputStream fis = new FileInputStream(files[i]);
   byte[] buffer = new byte[1024];
   int len = 0;
   while ((len = fis.read(buffer)) > 0)
   {
    fos.write(buffer , 0 , len);
   }

    fos.close();
  }
        return SUCCESS;
    }
}

4.struts.xml文件的内容

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

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

<constant name="struts.custom.i18n.resources" value="globalMessages"/>
<constant name="struts.i18n.encoding" value="GBK"/>
<constant name="struts.multipart.saveDir" value="/temp" />
<package name="upload" extends="struts-default">

  <action name="upload" class="lee.UploadAction">
            <interceptor-ref name="fileUpload">
                <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg,image/pjpeg</param>
            </interceptor-ref>
            <interceptor-ref name="defaultStack"/>
            <param name="savePath">/upload</param>
   <result name="input">/upload.jsp</result>
   <result>/succ.jsp</result>
  </action>

</package>
</struts>

二。List处理多个文件上传时的Action，其余的和Array的内容基本一致,就省略了
package com.ish.strtus.action;

import com.opensymphony.xwork2.Action;
import org.apache.struts2.ServletActionContext;
import java.util.*;
import java.io.*;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport
{
private String title;
    private List<File> upload;
    private List<String> uploadContentType;
    private List<String> uploadFileName;

//接受依赖注入的属性
    private String savePath;
//接受依赖注入的方法
    public void setSavePath(String value)
{
        this.savePath = value;
    }

    private String getSavePath() throws Exception
{
        return ServletActionContext.getRequest().getRealPath(savePath);
    }

public void setTitle(String title) {
  this.title = title;
}

public void setUpload(List<File> upload) {
this.upload = upload;
}

public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}

public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}

public String getTitle() {
return (this.title);
}

public List<File> getUpload() {
return (this.upload);
}

public List<String> getUploadContentType() {
return (this.uploadContentType);
}

public List<String> getUploadFileName() {
  return (this.uploadFileName);
}
@Override
    public String execute() throws Exception
{
  List<File> files = getUpload();
  for (int i = 0 ; i < files.size() ; i++)
  {
   //以服务器的文件保存地址和原文件名建立上传文件输出流
   FileOutputStream fos = new FileOutputStream(getSavePath() + "\" + getUploadFileName().get(i));
   FileInputStream fis = new FileInputStream(files.get(i));
   byte[] buffer = new byte[1024];
   int len = 0;
   while ((len = fis.read(buffer)) > 0)
   {
    fos.write(buffer , 0 , len);
   }
  }
        return SUCCESS;
    }
}