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一、文件上传
实现文件上传的方式有很多种，比如Apache的Common-FileUpload，但是实现起来非常的繁琐，而Struts2来实现文件上传则简单的多，默认也是基于Common-FileUpload的方式。
1.使用Struts2来实现文件上传，需要使用Struts2预定义的fileUpload拦截器，defaultStack拦截器栈引用了fileUpload拦截器；最后，struts-default包又将defaultStack拦截器声明为自己的默认拦截器引用。使用defaultStack拦截器栈，也从而引用了fileUpload拦截器
JSP页面
<body> <s:fielderror></s:fielderror> <form action="upload.action" method="post" enctype="multipart/form-data"> <input type="file" name="image"/><br> <input type="file" name="image"/><br> <input type="submit"><br> </form> </body>
文件上传Action
public class FileUploadAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private File[] image;
private String[] imageFileName;
private String[] imageContentType;
// 注意必须是xxxFileName,xxxContentType,xxx就是File 对象的引用名
@Override
public String execute() throws Exception {
String fileLocation = "D:\\mytemp";// 指定一个上传文件的存储位置
for (int i = 0; i < image.length; i++) {
// String fileName =
// fileLocation+File.separatorChar+imageFileName[i];
File destFile = new File(fileLocation, imageFileName[i]);
FileUtils.copyFile(image[i], destFile);
System.out.println("上传文件的名:" + imageFileName[i]);
System.out.println("上传文件的类型:" + imageContentType[i]);
}
return SUCCESS;
}
public File[] getImage() {
return image;
}
public void setImage(File[] image) {
this.image = image;
}
public String[] getImageFileName() {
return imageFileName;
}
public void setImageFileName(String[] imageFileName) {
this.imageFileName = imageFileName;
}
public String[] getImageContentType() {
return imageContentType;
}
public void setImageContentType(String[] imageContentType) {
this.imageContentType = imageContentType;
}
}Struts.xml<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<constant name="struts.custom.i18n.resources" value="fileupload"></constant>
<!-- 限制上传文件的总大小 -->
<constant name="struts.multipart.maxSize" value="10485760"></constant>
<package name="default" namespace="/" extends="struts-default">
<action name="upload" class="cn.cil.action.FileUploadAction">
<interceptor-ref name="defaultStack">
<param name="fileUpload.allowedExtensions">
.jpeg,.gif,.bmp,.jpg,.png
</param>
<param name="fileUpload.maximumSize">2097152</param>
</interceptor-ref>
<result name="input">/failure.jsp</result>
<result>/success.jsp</result>
<result name="fail">/failure.jsp</result>
</action>
</package>
在引用fileUpload拦截器的时候，可以指定三个参数(指定<param>子元素)：
应用国际化，自定义错误提示消息
关于name的值可以在struts-core-2.3.15.3.jar中的struts-messages_xx.properties中找到
二、文件下载
使用Struts2来实现文件下载，会用到它的stream类型的Result，这种Result最终会返回一个InputStream，只需要让这个InputStream能读到用户想要下载的文件
struts.xml
<package name="down" extends="struts-default">
<action name="download" class="cn.cil.action.FileDownAction" method="download" >
<result name="success" type="stream">
<param name="inputName">inputStream</param>
<param name="contentDisposition">attachment;filename=${fileName}</param>
<param name="contentType">application/octet-stream</param>
</result>
</action>
</package>
</struts>public class FileDownAction extends ActionSupport {
private InputStream inputStream;//定义一个输入流。名字不能为in
private String fileName;
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 download() throws Exception{
//实现下载：给inputStream赋值
String realPath = ServletActionContext.getServletContext().getRealPath("/六6.jpg");
//解决中文乱码
fileName = URLEncoder.encode(FilenameUtils.getName(realPath),"UTF-8");
//System.out.println(fileName);
inputStream = new FileInputStream(realPath);
return SUCCESS;
}
public String download1()throws Exception{
String realPath = "D:\\mytemp\\456.jpg";
fileName = URLEncoder.encode(FilenameUtils.getName(realPath), "UTF-8");
inputStream = new FileInputStream(realPath);
return SUCCESS;
}
}
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原文地址：http://blog.csdn.net/wjw0130/article/details/46786277
