struts2文件上传下载前段html,struts.xml配置和后端代码

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单文件上传、多文件上传和文件下载

单文件上传：

index页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>文件上传</title></head><body><!-- 上传页面的准备 --><s:form action="upload.action" enctype="multipart/form-data" method="post"><s:textfield name ="title" label ="标题"/><br/><s:file name ="upload" label="选择文件"/><br/><s:submit name ="submit" value ="上传文件"/></s:form> </body>
</html>

struts.xml配置相应的action：

<!--  单文件上传--><action name="upload" class="action.UploadAction"><param name="savePath">/image</param><result name="success">/upload_success.jsp</result></action>

对应的UploadAction类：

public class UploadAction extends ActionSupport{//封装上传文件的属性private File upload;//封装上传文件的类型private String uploadContentType;//封装上传文件的名称private String uploadFileName;public File getUpload() {return upload;}public void setUpload(File upload) {this.upload = upload;}public String getUploadContentType() {return uploadContentType;}public void setUploadContentType(String uploadContentType) {this.uploadContentType = uploadContentType;}public String getUploadFileName() {return uploadFileName;}public void setUploadFileName(String uploadFileName) {this.uploadFileName = uploadFileName;}public void setSavePath(String savePath) {this.savePath = savePath;}//获取文件上传的路径private String savePath;@Overridepublic String execute() throws Exception {//创建缓存数组byte [] buffer =new byte[1024];//读取文件FileInputStream fis =new FileInputStream(getUpload());//保存文件，并设置保存目录的路径FileOutputStream fos =new FileOutputStream(getSavePath()+"\\"+this.getUploadFileName());int length =fis.read(buffer);while(length>0){//每次写入length长度的内容fos.write(buffer,0,length);length=fis.read(buffer);}fis.close();fos.flush();fos.close();return SUCCESS;}public String getSavePath(){return ServletActionContext.getServletContext().getRealPath(savePath);}
}

多文件上传：

和单文件上传差不多只需要在index页面多添加几个文件上传的标签：

index页面：

<body><!-- 上传页面的准备 --><s:form action="uploads.action" enctype="multipart/form-data" method="post"><s:textfield name ="title" label ="标题"/><br/><s:file name ="uploads" label="选择文件"/><br/><s:file name ="uploads" label="选择文件"/><br/><s:file name ="uploads" label="选择文件"/><br/><s:submit name ="submit" value ="上传文件"/></s:form> </body>

struts.xml配置相应的action：

<!-- 多文件上传 --><action name ="uploads" class="action.UploadsAction"><!--通过param参数设置保存目录的路径 --><param name="savePath">/image</param><result name="success">/upload_success.jsp</result></action>

对应的UploadsAction类：

public class UploadsAction extends ActionSupport{//封装上传文件的属性private File[] uploads;//封装上传文件的类型private String[] uploadContentType;//封装上传文件的名称private String[] uploadFileName;public File[] getUploads() {return uploads;}public void setUploads(File[] uploads) {this.uploads = uploads;}public String[] getUploadContentType() {return uploadContentType;}public void setUploadContentType(String[] uploadContentType) {this.uploadContentType = uploadContentType;}public String[] getUploadFileName() {return uploadFileName;}public void setUploadFileName(String[] uploadFileName) {this.uploadFileName = uploadFileName;}//获取文件上传的路径private String savePath;@Overridepublic String execute() throws Exception {//创建缓存数组byte [] buffer =new byte[1024];//读取文件for (int i = 0; i < uploads.length; i++) {FileInputStream fis =new FileInputStream(getUploads()[i]);//保存文件，并设置保存目录的路径FileOutputStream fos =new FileOutputStream(getSavePath()+"\\"+this.getUploadFileName()[i]);int length =fis.read(buffer);while(length>0){//每次写入length长度的内容fos.write(buffer,0,length);length=fis.read(buffer);}fis.close();fos.flush();fos.close();}return SUCCESS;}public String getSavePath(){return ServletActionContext.getServletContext().getRealPath(savePath);}
}

文件下载：

index页面：

<body><a href="download.action?fileName=16.1.txt">点击此处下载文档</a>  </body>

struts.xml配置相应的action：

<action name="download" class="action.FileDownAction"><!--下载文件的路径  --><param name="inputPath">/image</param><result name="success" type="stream"><!--指定内容类型，下载的文件，可执行文件  --><param name="contentType">application/octet-stream</param><param name="inputName">inputStream</param><param name="contentDisposition">attachment;filename="${fileName}"</param><!--读取和下载文件时缓存区大小  --><param name="bufferSize">4096</param></result></action>

对应的UploadsAction类：

public class FileDownAction extends ActionSupport {//读取下载文件的目录   private String inputPath;//下载文件的文件名private String fileName;//读取下载文件的输入流private InputStream inputStream;//下载文件的类型private String contentType;public String getInputPath() {return inputPath;}public void setInputPath(String inputPath) {this.inputPath = inputPath;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}//文件下载的核心，获取输入流public InputStream getInputStream() throws Exception {//获取真实的路径String path =ServletActionContext.getServletContext().getRealPath(inputPath);return new BufferedInputStream(new FileInputStream(path+"\\"+fileName));}public void setInputStream(InputStream inputStream) {this.inputStream = inputStream;}public String getContentType() {return contentType;}public void setContentType(String contentType) {this.contentType = contentType;}@Overridepublic String execute() throws Exception {return SUCCESS;}}
文章来源：https://www.cnblogs.com/qingzhi/p/5945881.html