在Struts2中实现文件上传

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//上传文件源代码

package com.shunwang.actions;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.List;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

private String username;

private String password;

private List<File> file;

private List<String> fileFileName; //必须含有的字段

private List<String> fileFileContentType; //必须含有的字段

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;

}

public List<File> getFile() {

return file;

}

public void setFile(List<File> file) {

this.file = file;

}

public List<String> getFileFileName() {

return fileFileName;

}

public void setFileFileName(List<String> fileFileName) {

this.fileFileName = fileFileName;

}

public List<String> getFileFileContentType() {

return fileFileContentType;

}

public void setFileFileContentType(List<String> fileFileContentType) {

this.fileFileContentType = fileFileContentType;

}

@Override

public String execute() throws Exception {

for(int i=0;i<file.size();++i)

{

InputStream is=new FileInputStream(file.get(i));

String root = ServletActionContext.getServletContext().getRealPath("//");

File file=new File(root,fileFileName.get(i));

OutputStream os=new FileOutputStream(file);

byte buffer[]=new byte[1024];

while(is.read(buffer)>0)

{

os.write(buffer);

}

os.close();

is.close();

}

return SUCCESS;

}

Struts.xml的配置文件

<result>/uploadSuccess.jsp</result>

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

<interceptor-ref name="fileUpload">

<param name="allowedTypes">image/jpeg</param>

</interceptor-ref>

<interceptor-ref name="defaultStack"></interceptor-ref>

</action>

//动态加载上传文件数量的JavaScript代码段

function addMore()

{

var td=document.getElementById("td");

var br=document.createElement("br");

var input=document.createElement("input");

var button=document.createElement("input");

input.type="file";

input.name="file";

button.type="button";

button.value="移除该文件"

button.onclick=function()

{

if(confirm("确定删除对该文件的上传?"))

{

td.removeChild(br);

td.removeChild(input);

td.removeChild(button);

}

td.appendChild(br);

td.appendChild(input);

td.appendChild(button);

}

//示例jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

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

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>

<title>My JSP 'upload.jsp' starting page</title>

<!--

-->

function addMore()

{

var td=document.getElementById("td");

var br=document.createElement("br");

var input=document.createElement("input");

var button=document.createElement("input");

input.type="file";

input.name="file";

button.type="button";

button.value="移除该文件"

button.onclick=function()

{

if(confirm("确定删除对该文件的上传?"))

{

td.removeChild(br);

td.removeChild(input);

td.removeChild(button);

}

td.appendChild(br);

td.appendChild(input);

td.appendChild(button);

}

</script>

</head>

<body>

<s:fielderror/></font></strong></td></tr></table>

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

<tr><td>username:</td><td>

<s:textfield name="username" label="username"></s:textfield></td></tr><tr><td>password:</td><td>

<s:password name="password" label="password"></s:password></td></tr><tr><td>file:</td><td id="td">

<s:file name="file" label="file"></s:file><input type="button" onclick="addMore()" value="添加更多文件上传"></td>

</tr>

<tr>

<s:submit value=" 提交 "></s:submit>  </td>

</tr>

</table>

</s:form>

</body>

</html>