Struts1单文件、多文件上传

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1、单文件上传

1）创建JSP页面（singleFileUpload.jsp）

<%@page pageEncoding = "UTF-8"%>

<h1>
文件上传
</h1>
<hr />
<form action="upload.action" method="post" enctype="multipart/form-data">
name:
<input type="text" name="name" />
<br />
upload:
<input type="file" name="file" />
<br />
<input type="submit" value="上传" />
</form>

注意点：enctype="multipart/form-data"

2）创建Form（UploadForm。Java）

package fileUpload.singleFileUpload.form;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

public class UploadForm extends ActionForm {

private static final long serialVersionUID = 1L;

private String name;

private FormFile file;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public FormFile getFile() {
return file;
}

public void setFile(FormFile file) {
this.file = file;
}
}

注意点：Struts1提供了一个FormFile类来处理文件上传操作，另外注意，属性name，file名字必须与jsp页面一致，否则会报空指针。

3）创建Action（UploadAction。java）

package fileUpload.singleFileUpload.action;

import java.io.FileOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;

import fileUpload.singleFileUpload.form.UploadForm;

public class UploadAction extends Action {

// @Override
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

UploadForm uf = (UploadForm)form;
String name = uf.getName();
FormFile file = uf.getFile();
System.out.println("name=" + name);
String filename = file.getFileName();
System.out.println("fileName=" + filename);

FileOutputStream fos = new FileOutputStream("d:\\["+name+"]" + filename); //创建输出流
fos.write(file.getFileData()); //写入
fos.flush();//释放
fos.close(); //关闭
return mapping.findForward("success");
}
}

注意点：FormFile类的方法

4）Struts配置文件（struts-config.xml）

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<form-beans>

<form-bean name="uploadForm" type="fileUpload.singleFileUpload.form.UploadForm" />
</form-beans>

<action-mappings>

<action path="/upload" type="fileUpload.singleFileUpload.action.UploadAction" name="uploadForm" scope="request">
<forward name="success" path="/singleFileUpload.jsp" />
</action>
</action-mappings>



<controller maxFileSize="2M" />
</struts-config>

注意点：controller maxFileSize用来配置上传文件的大小，可根据实际情况配置，设置成-1则表示无限制。

2、多文件上传

1）创建JSP页面（mutityFileUpload.jsp）（上传文件夹个数可增可减）

<%@ page pageEncoding="utf-8"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<html>
<head>
<title>上传任意多个文件（总大小不能超过2M)</title>
<script language="javascript">
// 在DOM中插入一个上传文件列表项（div元素)和一个<input type="file"/>元素
function insertNextFile(obj)
{
// 获取上传控制个数
var childnum = document.getElementById("files").getElementsByTagName("input").length;
var id = childnum - 1;
var fullName = obj.value;
// 插入<div>元素及其子元素
var fileHtml = '';
fileHtml += '<div id = "file_preview' + id + '" style ="border-bottom: 1px solid #CCC;">';
fileHtml += '<img width =30 height = 30 src ="images/file.gif" title="' + fullName + '"/>';
fileHtml += '<a href="javascript:;" onclick="removeFile(' + id + ');">删除</a>   ';
fileHtml += fullName.substr(fullName.lastIndexOf('\\')+1) +' </div>';

var fileElement = document.getElementById("files_preview");
fileElement.innerHTML = fileElement.innerHTML + fileHtml;
obj.style.display = 'none'; // 隐藏当前的<input type=”file”/>元素
addUploadFile(childnum); // 插入新的<input type=”file”/>元素
}
// 插入新的<input type=”file”/>元素，适合于不同的浏览器（包括IE、FireFox等）
function addUploadFile(index)
{
try // 用于IE浏览器
{
var uploadHTML = document.createElement( "<input type='file' id='file_" + index +
"' name='file[" + index + "]' onchange='insertNextFile(this)'/>");
document.getElementById("files").appendChild(uploadHTML);
}
catch(e) // 用于其他浏览器
{
var uploadObj = document.createElement("input");
uploadObj.setAttribute("name", "file[" + index + "]");
uploadObj.setAttribute("onchange", "insertNextFile(this)");
uploadObj.setAttribute("type", "file");
uploadObj.setAttribute("id", "file_" + index);
document.getElementById("files").appendChild(uploadObj);
}
}
function removeFile(index) // 删除当前文件的<div>和<input type=”file”/>元素
{
document.getElementById("files_preview").removeChild(document.getElementById("file_preview" + index));
document.getElementById("files").removeChild(document.getElementById("file_" + index));
}
function showStatus(obj) // 显示“正在上传文件”提示信息
{
document.getElementById("status").style.visibility="visible";
}
</script>
</head>
<body>
<html:form enctype="multipart/form-data" action="multiUpload">
<span id="files"> <%-- 在此处插入用于上传文件的input元素 --%>
<input type="file" id="file_0" name="file[0]" onchange="insertNextFile(this)" /> </span>  
<html:submit value=" 上传 " onclick="showStatus(this);" />
</html:form>
<p>
<div id="status" style="visibility: hidden; color: Red">
正在上传文件
</div>
<p>
<%-- 在此处用DOM技术插入上传文件列表项 --%>
<div id="files_preview"
style="width: 500px; height: 500px; overflow: auto"></div>
</body>
</html>

2）创建Form（UploadMoreForm。java）

package fileUpload.mutityFileUpload.form;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

public class UploadMoreForm extends ActionForm{

private static final long serialVersionUID = 1L;
private List<FormFile> myFiles = new ArrayList<FormFile>(); // 用于保存不定数量的FormFile对象

public FormFile getFile(int i) // 索引属性
{
return myFiles.get(i);
}
public void setFile(int i, FormFile myFile) // 索引属性
{
if (myFile.getFileSize() > 0) // 只有上传文件的字节数大于0，才上传这个文件
{
myFiles.add(myFile);
}
}
public int getFileCount() // 获得上传文件的个数
{
return myFiles.size();
}

}

3）创建Action（UploadMoreAction。java）

package fileUpload.mutityFileUpload.action;

import java.io.FileOutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;

import fileUpload.mutityFileUpload.form.UploadMoreForm;

public class UploadMoreAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
{
UploadMoreForm umForm = (UploadMoreForm) form;
int count = 0;
try
{
count = umForm.getFileCount(); // 获得上传文件的总数
for (int i = 0; i < count; i++)
{
FormFile file = umForm.getFile(i);
System.out.println(file.getFileName());
FileOutputStream fos = new FileOutputStream("d:\\" + file.getFileName()); //创建输出流
fos.write(file.getFileData()); //写入
fos.flush();//释放
fos.close(); //关闭
}
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
}

4）Struts配置文件（struts-config.xml）

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<form-beans>

<form-bean name="uploadMoreForm" type="fileUpload.mutityFileUpload.form.UploadMoreForm" />
</form-beans>

<action-mappings>

<action path="/multiUpload" type="fileUpload.mutityFileUpload.action.UploadMoreAction"

name="uploadMoreForm" scope="request">
<forward name="success" path="/mutityFileUpload.jsp" />
</action>

<controller maxFileSize="2M" />
</action-mappings>



<controller maxFileSize="2M" />
</struts-config>

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