struts2文件上传和下载
1.创建一个index.jsp界面 和success.jsp上传成功界面
index.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> ???<body> ?????<s:form action="files/add" ?method="post" enctype="multipart/form-data"> ???????<s:file label="图片上传" name="upload"/> ????????<s:submit value="提交"/> ???</s:form>
success.jsp
?<body> ???文件操作成功！！ ?</body>
2.创建对应的struts.xml文件
<?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><!--设置文件上传的大小 ?--><constant name="struts.multipart.maxSize" value="5000000000"></constant><constant name="struts.devMode" value="true"/> <package name="default" namespace="/files" extends="struts-default"> ???<action name="add" class="cn.bdqn.action.UploadAction" method="upload"> ?<!-- 限制文件只能是图片 ?<interceptor-ref name="fileUpload"> ???<param name="allowedTypes">image/jpeg</param> ?</interceptor-ref> ?<interceptor-ref name="defaultStack"></interceptor-ref> --> ???<result>/success.jsp</result> ???<result ?name="input">/index.jsp</result> ?</action> </package></struts>
3.创建对应的UploadAction
属性名的规范 底层代码 FileUploadInterceptor中
File[] files = multiWrapper.getFiles(inputName); ???????????????????if (files != null && files.length > 0) { ???????????????????????List<File> acceptedFiles = new ArrayList<File>(files.length); ???????????????????????List<String> acceptedContentTypes = new ArrayList<String>(files.length); ???????????????????????List<String> acceptedFileNames = new ArrayList<String>(files.length); ???????????????????????String contentTypeName = inputName + "ContentType"; ???????????????????????String fileNameName = inputName + "FileName";public class UploadAction extends ActionSupport { ??private ?File upload; ??//上传的文件 ?和前台file标签中的name属性 一致 ??private ?String uploadFileName; ??//上传的文件名称 ??底层有规定，必须按照规范来 ??private ?String uploadContentType; ??//上传的文件的类型 ????????????//文件上传的方法 ???public ?String ?upload(){ ???????System.out.println("进入了文件的上传......"); ???????//指定文件上传的路径 ???????String ?path=ServletActionContext.getServletContext().getRealPath("/upload"); ???????//File.separatorChar ?系统分隔符 ?区别linux和windows系统 ???????String pathName=path+File.separatorChar+uploadFileName; ???????System.out.println("上传文件的全名称："+pathName); ???????try { ???????????FileUtils.copyFile(upload, new File(pathName)); ???????} catch (IOException e) { ???????????e.printStackTrace(); ???????????return INPUT; ???????} ???????????????return ?SUCCESS; ???} ???public File getUpload() { ???????return upload; ???} ???public void setUpload(File upload) { ???????this.upload = upload; ???} ???public String getUploadFileName() { ???????return uploadFileName; ???} ???public void setUploadFileName(String uploadFileName) { ???????this.uploadFileName = uploadFileName; ???} ???public String getUploadContentType() { ???????return uploadContentType; ???} ???public void setUploadContentType(String uploadContentType) { ???????this.uploadContentType = uploadContentType; ???} ???????}4.多文件上传 创建index2.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> ???<body> ?????<s:form action="files/adds" ?method="post" enctype="multipart/form-data"> ???????<s:file label="图片上传" name="upload"/> ???????<s:file label="图片上传" name="upload"/> ???????<s:file label="图片上传" name="upload"/> ????????<s:submit value="提交"/> ???</s:form> ???</body>
5.在struts.xml文件中 新增
<!-- 多个文件上传 --> ?<action name="adds" class="cn.bdqn.action.UploadAction2" method="upload"> ???<result>/success.jsp</result> ???<result ?name="input">/index2.jsp</result> ?</action>
6.创建对应的UploadAction2
public class UploadAction2 extends ActionSupport { ??private ?File [] upload; ??//上传的文件 ??private ?String [] uploadFileName; ??//上传的文件名称 ??private ?String [] uploadContentType; ??//上传的文件的类型 ????????//文件上传的方法 ???public ?String ?upload(){ ???????System.out.println("进入了多文件的上传......"); ????????String path= ServletActionContext.getServletContext().getRealPath("/upload"); ????????String pathName=""; ?????????//遍历 用户选择的文件 ????????for (int i = 0; i < upload.length; i++) { ????????????pathName= path+File.separatorChar+uploadFileName[i]; ????????????try { ????????????????//把用户选择的文件复制到 指定的文件下 ???????????????FileUtils.copyFile(upload[i], new ?File(pathName)); ???????????} catch (IOException e) { ???????????????e.printStackTrace(); ???????????????return ?INPUT; ???????????} ???????} ????????????????return ?SUCCESS; ???} ???public File[] getUpload() { ???????return upload; ???} ???public void setUpload(File[] upload) { ???????this.upload = upload; ???} ???public String[] getUploadFileName() { ???????return uploadFileName; ???} ???public void setUploadFileName(String[] uploadFileName) { ???????this.uploadFileName = uploadFileName; ???} ???public String[] getUploadContentType() { ???????return uploadContentType; ???} ???public void setUploadContentType(String[] uploadContentType) { ???????this.uploadContentType = uploadContentType; ???}}7.创建一个downLoad.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> ???<body> ?????<s:form action="files/downLoad" ?method="post"> ??????<s:textfield label="下载的地址" name="downLoad"/> ????????<s:submit value="下载"/> ???</s:form> ???</body>
8.在struts.xml文件中新增
<!-- 文件下载 --> ?<action name="downLoad" class="cn.bdqn.action.DownLoadAction" method="downLoad"> ????<!-- result节点中 不需要返回界面 ???可以设置属性 --> ???<result type="stream"> ???<!-- 文件下载到本地下载文件夹中 ??不写 默认 在界面中显示 ??源码得知 --> ?????<param name="contentDisposition">attachment;filename=${fileName}</param> ???</result> ?</action>public class StreamResult extends StrutsResultSupport { ???private static final long serialVersionUID = -1468409635999059850L; ???protected static final Logger LOG = LoggerFactory.getLogger(StreamResult.class); ???public static final String DEFAULT_PARAM = "inputName"; ???protected String contentType = "text/plain"; ???protected String contentLength; ???protected String contentDisposition = "inline"; ???protected String contentCharSet ; ???protected String inputName = "inputStream";9.创建对应的DownLoadAction
public class DownLoadAction extends ActionSupport { ??private ??InputStream inputStream; ?//创建输入流对象 ???private ?String ?fileName; ??//下载文件的名称 ???private ?String ?downLoad; ?//和前台用户输入的name属性值 一致 ???????????????//文件下载 ???public ?String ??downLoad(){ ???????try { ???????????inputStream=new FileInputStream(downLoad); ???????????// e:\java\cat.jpg ??只需要文件名 ????????????int index=downLoad.lastIndexOf("\\"); ???????????fileName=downLoad.substring(index+1); ???????????//防止下载的中文乱码 ???????????try { ???????????????fileName=URLEncoder.encode(fileName, "utf-8"); ???????????} catch (UnsupportedEncodingException e) { ???????????????System.out.println("乱码问题"); ???????????????e.printStackTrace(); ???????????} ???????} catch (FileNotFoundException e) { ???????????e.printStackTrace(); ???????????return ?INPUT; ???????} ???????????????????????return SUCCESS; ???} ??????????????public InputStream getInputStream() { ???????return inputStream; ???} ???public void setInputStream(InputStream inputStream) { ???????this.inputStream = inputStream; ???} ???public String getFileName() { ???????return fileName; ???} ???public void setFileName(String fileName) { ???????this.fileName = fileName; ???} ???public String getDownLoad() { ???????return downLoad; ???} ???public void setDownLoad(String downLoad) { ???????this.downLoad = downLoad; ???}}Struts2（二）文件上传和下载
原文地址：https://www.cnblogs.com/xiaobaizhang/p/8926142.html