Struts2 简单的上传文件并且显示图片

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代码结构：

UploadAction.java

package com.action;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

    private File upload;

    private String uploadFileName;

    public File getUpload() {

        return upload;

    }

    public void setUpload(File upload) {

        this.upload = upload;

    }

    public String getUploadFileName() {

        return uploadFileName;

    }

    public void setUploadFileName(String uploadFileName) {

        this.uploadFileName = uploadFileName;

    }

    @Override

    public String execute() throws Exception {

        InputStream is = new FileInputStream(getUpload());

        String path = ServletActionContext.getServletContext().getRealPath("/upload");

        OutputStream os = new FileOutputStream(path+"/"+this.uploadFileName);

        byte buffer[] = new byte[1024];

        int count = 0;

        while((count=is.read(buffer))>0){

            os.write(buffer,0,count);

        }

        os.close();

        is.close();

        return SUCCESS;

    }

}

index.jsp

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

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

      <head>

        <title>文件上传</title>

      </head>

      <body>

        <s:form action="myupload" method="post" enctype="multipart/form-data">

        <s:file name="upload" label="上传的文件"></s:file>

        <s:submit value="上传"></s:submit>

        </s:form>

      </body>

</html>

struts.jsp

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

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

    <package name="default" extends="struts-default">

        <action name="myupload" class="com.action.UploadAction">

            <result name="success">/success.jsp</result>

        </action>

    </package>

    <constant name="struts.multipart.saveDir" value="/tmp"></constant>

</struts>

success.jsp

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

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

      <head>

        <title>文件上传</title>

      </head>

      <body>

        恭喜你，上传成功！<img src=upload/<s:property value="uploadFileName"/>>

      </body>

</html>