在WEB-INF下新建一个content目录，建立一个upload.jsp
1 <%@ page contentType="text/html; charset=UTF-8" language="java" errorPage="" %> 2 <%@taglib prefix="s" uri="/struts-tags"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 4 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 5 <html xmlns="http://www.w3.org/1999/xhtml"> 6 <head> 7 <title>简单的文件上传</title> 8 </head> 9 <body> 10 <s:form action="uploadPro" method="post" 11 enctype="multipart/form-data"> 12 <s:textfield name="title" label="文件标题"/><br /> 13 <s:file name="upload" label="选择文件"/><br /> 14 <s:submit value="上传"/> 15 </s:form> 16 </body> 17 </html>
然后UploadAction.java如下
package action;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import java.io.File;
import java.io.*;
public class UploadAction extends ActionSupport{
private String title;
private File upload;
private String uploadContentType;
private String uploadFileName;
private String savePath;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
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 String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
@Override
public String execute() throws Exception{
FileOutputStream fos = new FileOutputStream(getSavePath()+"//"+getUploadFileName());
FileInputStream fis = new FileInputStream(getUpload());
byte[] buffer = new byte[1024];
int len = 0;
while((len = fis.read(buffer)) > 0){
fos.write(buffer, 0 , len);
}
fis.close();
fos.close();
return SUCCESS;
}
}
在struts2中，如果表单中包含一个name属性为xxx的文件域，则对应action需要使用三个属性来封装该文件域的信息。
1.类型为File的xxx属性封装了该文件域对应的文件内容。
2.类型为String的xxxFileName属性封装了该文件域对应的文件的文件名。
3.类型为String的xxxContentType属性封装了该文件域对应的文件的文件类型。
上面例子struts2直接将文件域包含的上传文件名和文件类型的信息封装到uploadFileName和uploadContentType属性中。
下面是sruts.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<constant name="struts.custom.i18n.resources" value="mess"/>
<!-- 设置该应用使用的解码集 -->
<constant name="struts.i18n.encoding" value="GBK"/>
<package name="lee" extends="struts-default">
<!-- 配置处理文件上传的Action -->
<action name="uploadPro" class="action.UploadAction">
<!-- 动态设置Action的属性值 -->
<param name="savePath">/upload</param>
<!-- 配置Struts 2默认的视图页面 -->
<result>/WEB-INF/content/succ.jsp</result>
</action>
<action name="*">
<result>/WEB-INF/content/{1}.jsp</result>
</action>
</package>
</struts>
然后是web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <!-- 让Struts 2的核心Filter拦截所有请求 --> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
succ.jsp:
<%@ page contentType="text/html; charset=UTF-8" language="java" errorPage="" %> <%@taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>上传成功</title> </head> <body> 上传成功!<br/> 文件标题:<s:property value=" + title"/><br/> 文件为：<img src="<s:property value="'upload/' + uploadFileName"/>"/><br/> </body> </html>
如图
