sruts2：單個文件上傳，多個文件上傳（屬性驅動）

時間 2019-11-06

標籤 sruts2 sruts 單個文件上傳多個屬性驅動简体版

原文原文鏈接

文件上傳功能在Struts2中獲得了很好的封裝，主要使用fileUpload上傳組件。html

1. 單個文件上傳

1.1 建立上傳單個文件的JSP頁面、顯示提交結果的JSP頁面

uploadTest1.jspjava

<%@ 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：代碼中加入了enctype="multipart/form-data"；並且使用了<s:file/>標籤，尤爲注意<s:file/>的name屬性。apache

showResult1.jsp數組

<%@ 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>
        您上傳的文件名爲：<s:property value="uploadFileFileName" />，存放目錄：<s:property value="#request.storeDir"/>
        <br />
        <br/>
        <!--下載上下文路徑-->
        <s:a href="%{#request.get('javax.servlet.forward.context_path')}/upload/%{uploadFileFileName}">點擊這裏下載</s:a>
        <br />
    </body>
</html>

1.2 生成Action類

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 {
        // 上傳物理路徑
        String targetDirectory = ServletActionContext.getServletContext().getRealPath("/upload");
        // 生成上傳的File對象
        File target = new File(targetDirectory, uploadFileFileName);
        // 複製File對象，從而實現上傳文件
        FileUtils.copyFile(uploadFile, target);
        
        ServletActionContext.getRequest().setAttribute("storeDir", targetDirectory);

        return SUCCESS;
    }
}

Action實例中File變量命名規則：服務器

數據類型爲File的變量uploadFile和JSP頁面中的<s:file/>標籤的name屬性值要一致，這樣才能夠使用Struts2的攔截器進行屬性值的自動封裝。
Action實例中有uploadFileFileName變量，對應於上傳文件的文件名，它的命名規則就是File的變量名後加FileName。

1.3 設置上傳文件相關參數（struts.properties）

struts.multipart.maxSize=2048000000
struts.multipart.saveDir=/upload

一般此文件存放於WEB-INF\classes目錄下。jsp

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 測試

打開IE，輸入地址：http://127.0.0.1:8080/st/struts2/demo12/uploadTest1.jspide

結果以下：post

選擇任意一個文件提交後，結果以下：測試

一個，顯示了服務器物理存儲地址；二個，提供了下載連接。this

2. 多個文件上傳（屬性驅動）

Struts2支持多文件批量上傳，將上面的代碼中的File類型改爲File[]便可。

2.1 建立上傳多個文件的JSP頁面、顯示提交結果的JSP頁面

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：由於是屬性驅動，因此表單元素的命名須要以fileUploadTools打頭。

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>
        您上傳的文件名列表：
        <br/>
        <!--對Action中對象（fileUploadTools）包含的數組（uploadFileFileName）的遍歷-->
        <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類及屬性驅動類

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;

    // 聲明封裝了File上傳的FileUploadTools類的實例
    // FileUploadTools類也封裝了上傳的屬性及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[];// 上傳的文件是數組類型
    private String uploadFileFileName[];// 文件名是數組類型
    private String uploadFileContentType[];

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    // 上傳的ContentType文件類型也是數組類型
    // 必需要加上對ContentType的聲明，不然會出現異常
    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("用戶名：" + 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 設置上傳文件相關參數（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>