目錄

單檔案上傳 

上傳多檔案

單檔案上傳 

首先在頁面

<!-- Struts2的檔案上傳標籤 -->
	<s:form action="FileUpAction" namespace="/" method="POST"
		enctype="multipart/form-data">
		<s:file name="fileUpload" label="瀏覽檔案" size="40" />
		<s:submit value="submit" name="上傳" />
	</s:form>

action

package com.bdqn.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport{
	private File fileUpload;
	private String fileUploadFileName;
	
	public String fileUp() throws Exception {
		System.out.println(fileUpload);
		FileInputStream fis = new FileInputStream(fileUpload);
		File file = new File("D://Tomcat//apache-tomcat-8.5.31//webapps//上傳檔案Struts//file//"+fileUploadFileName);
		if (file.exists()) {
			file.createNewFile();
		}
		FileOutputStream os = new FileOutputStream(file);
		byte[] bb = new byte[1024];
		while (fis.read(bb)!=-1) {
			os.write(bb);
			os.flush();
		}
		return SUCCESS;
	}

	public File getFileUpload() {
		return fileUpload;
	}

	public void setFileUpload(File fileUpload) {
		this.fileUpload = fileUpload;
	}

	public String getFileUploadFileName() {
		return fileUploadFileName;
	}

	public void setFileUploadFileName(String fileUploadFileName) {
		this.fileUploadFileName = fileUploadFileName;
	}
	
}
 

上傳多檔案

就是在單檔案的基礎上把單個屬性變為陣列

<!-- Struts2的檔案上傳標籤 -->
	<s:form action="FileUpAction" namespace="/" method="POST"
		enctype="multipart/form-data">
		<s:file name="fileUpload" label="瀏覽檔案" size="40" />
		<s:file name="fileUpload" label="瀏覽檔案" size="40" />
		<s:file name="fileUpload" label="瀏覽檔案" size="40" />
		<s:submit value="submit" name="上傳" />
	</s:form>
 

package com.bdqn.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport{
	private File[] fileUpload;
	private String[] fileUploadFileName;
	
	public String fileUp() throws Exception {
		for (int i = 0; i < fileUpload.length; i++) {
			System.out.println(fileUpload);
			FileInputStream fis = new FileInputStream(fileUpload[i]);
			File file = new File("D://Tomcat//apache-tomcat-8.5.31//webapps//上傳檔案Struts//"+fileUploadFileName[i]);
			if (file.exists()) {
				file.createNewFile();
			}
			FileOutputStream os = new FileOutputStream(file);
			byte[] bb = new byte[1024];
			while (fis.read(bb)!=-1) {
				os.write(bb);
				os.flush();
			}
		}
		return SUCCESS;
	}

	public File[] getFileUpload() {
		return fileUpload;
	}

	public void setFileUpload(File[] fileUpload) {
		this.fileUpload = fileUpload;
	}

	public String[] getFileUploadFileName() {
		return fileUploadFileName;
	}

	public void setFileUploadFileName(String[] fileUploadFileName) {
		this.fileUploadFileName = fileUploadFileName;
	}
	
}
 

檔案自動掃描下載

package com.bdqn.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

import com.opensymphony.xwork2.ActionSupport;

public class Fileload extends ActionSupport{
	//用來儲存檔案
	private File[] files = new File[100];
	//用來儲存檔名字
	private String[] fileName = new String[100];
	//用來儲存檔案個數，用來遍歷
	private List<Integer> list = new ArrayList<Integer>();

	//頁面返回的檔案地址，用於下載
	private String fileinfo;
	//用來記錄名字
	private String name;

	//查詢檔案的個數和下載地址，儲存起來輸出到頁面
	public String load() throws Exception {
		//獲取專案底下file的所有檔案
		File file = new File("D://Tomcat//apache-tomcat-8.5.31//webapps//上傳檔案Struts//file");
		//假如頁面存在
		if (file.exists()) {
			//獲取該資料夾底下的所有的檔案和目錄
			File[] tempList = file.listFiles();
			//迴圈遍歷確定是不是檔案，或者是不是目錄
			for (int i = 0; i < tempList.length; i++) {
				if (tempList[i].isFile()) {
					//如果檔案就加入如檔案陣列
					files[i] = tempList[i];
					//同時獲取該問檔案的名字
					fileName[i] = tempList[i].getName();
					//為陣列的長度進行標記，等下在頁面進行遍歷也是靠它
					list.add(i);
				}
			}
		}
		return SUCCESS;
	}

	public String xiazai() throws Exception {
		//讀入檔案地址
		File file = new File(fileinfo);
		//讀入流
		FileInputStream is= new FileInputStream(file);
		//接受容器
		File file2 = new File("J://"+name);
		//寫出流
		FileOutputStream fis = new FileOutputStream(file2);
		//緩衝區
		byte[] bb = new byte[1024];
		while (is.read(bb)!=-1) {
			fis.write(bb);
			fis.flush();
		}
		return SUCCESS;
	}


	public List<Integer> getList() {
		return list;
	}
	public void setList(List<Integer> list) {
		this.list = list;
	}

	public File[] getFiles() {
		return files;
	}
	public void setFiles(File[] files) {
		this.files = files;
	}
	public String[] getFileName() {
		return fileName;
	}
	public void setFileName(String[] fileName) {
		this.fileName = fileName;
	}

	public String getFileinfo() {
		return fileinfo;
	}

	public void setFileinfo(String fileinfo) {
		this.fileinfo = fileinfo;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}

<!-- 檔案遍歷方法 -->
		<action name="loadAction" class="com.bdqn.action.Fileload" method="load">
			<result name="success">/loadfile.jsp</result>
		</action>
		<!-- 檔案下載類 -->
		<action name="xiazaiAction" class="com.bdqn.action.Fileload" method="xiazai">
			<result name="success">/success.jsp</result>
		</action>

頁面程式碼，和action是關聯的

<table border="2">
		<tr>
			<td>檔名</td>
			<td>下載</td>
		</tr>
		<c:forEach items="${list}" var="li" varStatus="str">
			<tr>
				<td>${fileName[li]}</td>
				<td>
					<form action="/上傳檔案Struts/Fileload/xiazaiAction">
						<input type="hidden" name="fileinfo" value="${files[li]}">
						<input type="hidden" name="name" value="${fileName[li]}">
						<input type="submit" value="下載">
					</form></td>
			</tr>
		</c:forEach>
	</table>

<body>
   	<a href="fileUp.jsp">上傳檔案</a>
    <a href="/上傳檔案Struts/Fileload/loadAction">下載檔案網頁</a>
  </body>

下載的第二種方法

<a href="${pageContext.request.contextPath}/file/${fileName[li]}" download="">下載</a>

獲得當前專案名字

${pageContext.request.contextPath}