sruts2:单个文件上传,多个文件上传(属性驱动)

文件上传功能在Struts2中得到了很好的封装,主要使用fileUpload上传组件。

1. 单个文件上传

1.1 创建上传单个文件的JSP页面、显示提交结果的JSP页面

uploadTest1.jsp

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

<%@ page isELIgnored="false"%>

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



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

<html>

    <head>

    </head>

    <body>

        <s:form action="uploadT1" method="post" enctype="multipart/form-data">

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

            <br />

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

        </s:form>

    </body>

</html>

注意:代码中加入了enctype="multipart/form-data";而且使用了<s:file/>标签,尤其注意<s:file/>的name属性。

showResult1.jsp

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

<%@ page isELIgnored="false"%>

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



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

<html>

    <body>

        您上传的文件名为:<s:property value="uploadFileFileName" />,存放目录:<s:property value="#request.storeDir"/>

        <br />

        <br/>

        <!--下载上下文路径-->

        <s:a href="%{#request.get('javax.servlet.forward.context_path')}/upload/%{uploadFileFileName}">点击这里下载</s:a>

        <br />

    </body>

</html>

1.2 生成Action类

package com.clzhang.struts2.demo12;



import java.io.File;

import java.io.IOException;

import org.apache.commons.io.FileUtils;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;



public class UploadTest1Action extends ActionSupport {

    public static final long serialVersionUID = 1;



    private File uploadFile;

    private String uploadFileFileName;



    public File getUploadFile() {

        return uploadFile;

    }

    public void setUploadFile(File uploadFile) {

        this.uploadFile = uploadFile;

    }

    public String getUploadFileFileName() {

        return uploadFileFileName;

    }

    public void setUploadFileFileName(String uploadFileFileName) {

        this.uploadFileFileName = uploadFileFileName;

    }



    public String execute() throws IOException {

        // 上传物理路径

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

        // 生成上传的File对象

        File target = new File(targetDirectory, uploadFileFileName);

        // 复制File对象,从而实现上传文件

        FileUtils.copyFile(uploadFile, target);

        

        ServletActionContext.getRequest().setAttribute("storeDir", targetDirectory);



        return SUCCESS;

    }

}

Action实例中File变量命名规则

  • 数据类型为File的变量uploadFile和JSP页面中的<s:file/>标签的name属性值要一致,这样才可以使用Struts2的拦截器进行属性值的自动封装。
  • Action实例中有uploadFileFileName变量,对应于上传文件的文件名,它的命名规则就是File的变量名后加FileName。

1.3 设置上传文件相关参数(struts.properties)

struts.multipart.maxSize=2048000000

struts.multipart.saveDir=/upload

通常此文件存放于WEB-INF\classes目录下。

1.4 修改struts.xml文件

        <action name="uploadT1" class="com.clzhang.struts2.demo12.UploadTest1Action">

            <result>/struts2/demo12/showResult1.jsp</result>

        </action>

1.5 测试

打开IE,输入地址:http://127.0.0.1:8080/st/struts2/demo12/uploadTest1.jsp

结果如下

sruts2:单个文件上传,多个文件上传(属性驱动)

选择任意一个文件提交后,结果如下

sruts2:单个文件上传,多个文件上传(属性驱动)

一个,显示了服务器物理存储地址;二个,提供了下载链接。

2. 多个文件上传(属性驱动)

Struts2支持多文件批量上传,将上面的代码中的File类型改成File[]即可。

2.1 创建上传多个文件的JSP页面、显示提交结果的JSP页面

uploadTest2.jsp

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

<%@ page isELIgnored="false"%>

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



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

<html>

    <head>

    </head>

    <body>

        <s:form action="uploadT2" method="post" enctype="multipart/form-data">

            username:<s:textfield name="fileUploadTools.username"></s:textfield>

            <br />

            <s:file name="fileUploadTools.uploadFile"></s:file>

            <br />

            <s:file name="fileUploadTools.uploadFile"></s:file>

            <br />

            <s:file name="fileUploadTools.uploadFile"></s:file>

            <br />

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

        </s:form>

    </body>

</html>

注意:因为是属性驱动,所以表单元素的命名需要以fileUploadTools打头。

showResult2.jsp

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

<%@ page isELIgnored="false"%>

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



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

<html>

    <body>

        您上传的文件名列表:

        <br/>

        <!--对Action中对象(fileUploadTools)包含的数组(uploadFileFileName)的遍历-->

        <s:iterator value="fileUploadTools.uploadFileFileName" status="st">

            <s:iterator value="fileUploadTools.uploadFileFileName[#st.index]"> 

                <s:property />

                <br/>

            </s:iterator>

        </s:iterator>

        <br />

    </body>

</html>

2.2 生成Action类及属性驱动类

UploadTest2Action.java

package com.clzhang.struts2.demo12;



import java.io.IOException;



import com.opensymphony.xwork2.ActionSupport;



public class UploadTest2Action extends ActionSupport {

    public static final long serialVersionUID = 1;



    // 声明封装了File上传的FileUploadTools类的实例

    // FileUploadTools类也封装了上传的属性及get和set方法

    private FileUploadTools fileUploadTools = new FileUploadTools();



    public FileUploadTools getFileUploadTools() {

        return fileUploadTools;

    }

    public void setFileUploadTools(FileUploadTools fileUploadTools) {

        this.fileUploadTools = fileUploadTools;

    }



    @Override

    public String execute() throws IOException {

        fileUploadTools.beginUpload();

        

        return SUCCESS;

    }

}

FileUploadTools.java

package com.clzhang.struts2.demo12;



import java.io.File;

import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.Date;



import org.apache.commons.io.FileUtils;

import org.apache.struts2.ServletActionContext;



public class FileUploadTools {

    private String username;

    private File uploadFile[];// 上传的文件是数组类型

    private String uploadFileFileName[];// 文件名是数组类型

    private String uploadFileContentType[];



    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    // 上传的ContentType文件类型也是数组类型

    // 必须要加上对ContentType的声明,否则会出现异常

    public String[] getUploadFileContentType() {

        return uploadFileContentType;

    }

    public void setUploadFileContentType(String[] uploadFileContentType) {

        this.uploadFileContentType = uploadFileContentType;

    }

    public File[] getUploadFile() {

        return uploadFile;

    }

    public void setUploadFile(File[] uploadFile) {

        this.uploadFile = uploadFile;

    }

    public String[] getUploadFileFileName() {

        return uploadFileFileName;

    }

    public void setUploadFileFileName(String[] uploadFileFileName) {

        this.uploadFileFileName = uploadFileFileName;

    }



    public String beginUpload() throws IOException {

        System.out.println("用户名:" + username);



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

        for (int i = 0; i < uploadFile.length; i++) {

            File target = new File(targetDirectory, new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss")

                    .format(new Date()).toString() + System.nanoTime() + uploadFileFileName[i]);



            FileUtils.copyFile(uploadFile[i], target);

        }



        return "success";

    }

}

2.3  设置上传文件相关参数(struts.properties),同上

2.4 修改struts.xml文件

        <action name="uploadT2" class="com.clzhang.struts2.demo12.UploadTest2Action">

            <result>/struts2/demo12/showResult2.jsp</result>

        </action>

2.5 测试

打开IE,输入地址:http://127.0.0.1:8080/st/struts2/demo12/uploadTest2.jsp

结果如下:

sruts2:单个文件上传,多个文件上传(属性驱动)

任意选择三个文件后,提交,结果如下:

sruts2:单个文件上传,多个文件上传(属性驱动)

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