Struts学习总结-02 上传文件

时间：2022-02-28 06:55:52

　　Struts 2框架提供了内置支持处理文件上传使用基于HTML表单的文件上传。上传一个文件时，它通常会被存储在一个临时目录中，他们应该由Action类进行处理或移动到一个永久的目录，以确保数据不丢失。

1. upload.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  >

<html>

  <head>

    <title>uploadDemo</title>

  </head>

  <body>

 <s:form action="/myUpload.action"   enctype="multipart/form-data">

         <s:file name="myfile"></s:file>

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

 </s:form>

  </body>

</html>

2 uploadResult.jsp

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

<%

　　String path = request.getContextPath();

　　String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML  >

<html>

  <head>

  </head>

  <body>

    Upload success!!

  </body>

</html>

3 UploadAction.java

package com.xinping.action;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

    private File myfile; // 对应真正上传的文件

    private String myfileFileName; // 对应上传的文件名

    public File getMyfile() {

        return myfile;

    }

    public void setMyfile(File myfile) {

        this.myfile = myfile;

    }

    public String getMyfileFileName() {

        return myfileFileName;

    }

    public void setMyfileFileName(String myfileFileName) {

        this.myfileFileName = myfileFileName;

    }

    @Override

    public String execute() throws Exception {

        InputStream is = new FileInputStream(myfile);

        OutputStream os = new FileOutputStream("E://temp3//" + myfileFileName);

        byte[] buffer = new byte[];

        int length = ;

        while (- != (length = is.read(buffer))) {

            os.write(buffer, , length);

        }

        os.close();

        is.close();

        return SUCCESS;

    }

}

4 struts.xml

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

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <!-- 所有匹配*.action的请求都由struts2处理 -->

    <constant name="struts.action.extension" value="action" />

    <!-- 是否启用开发模式 -->

    <constant name="struts.devMode" value="true" />

    <!-- struts配置文件改动后，是否重新加载 -->

    <constant name="struts.configuration.xml.reload" value="true" />

    <!-- 设置浏览器是否缓存静态内容 -->

    <constant name="struts.serve.static.browserCache" value="false" />

    <!-- 请求参数的编码方式 -->

    <constant name="struts.i18n.encoding" value="utf-8" />

    <!-- 每次HTTP请求系统都重新加载资源文件，有助于开发 -->

    <constant name="struts.i18n.reload" value="true" />

    <!-- 文件上传最大值 -->

    <constant name="struts.multipart.maxSize" value="" />

    <!-- 让struts2支持动态方法调用 -->

    <constant name="struts.enable.DynamicMethodInvocation" value="true" />

    <!-- Action名称中是否还是用斜线 -->

    <constant name="struts.enable.SlashesInActionNames" value="false" />

    <!-- 允许标签中使用表达式语法 -->

    <constant name="struts.tag.altSyntax" value="true" />

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

            <action name="myUpload" class="com.xinping.action.UploadAction">

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

            </action>

    </package>

</struts>

参考资料：

http://www.yiibai.com/struts_2/struts_file_uploads.html

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