java Struts2框架下实现文件上传功能例子代码，今天给各位带来的是Struts2框架实现文件上传的方法，供大家参考，有兴趣的朋友来看看吧。
struts2的配置过程
（1）在项目中加入jar包
（2）web.xml中filter（过滤器）的配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<display-name></display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
（3）struts.xml配置文件的编写
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<display-name></display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
（4）action类的编写
package com.xmgc.sc.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.struts2.ServletActionContext;
public class MyUpLoadAction {
private String title;
private File upload;//与form表单中的file文件类型的名字是一样的
private String uploadContentType;//前缀必需要是上面的upload
private String uploadFileName;
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() {
//ServletContext cxt=ServletActionContext.getServletContext();
//String path=cxt.getRealPath("/");
//这个获取的path为：http://localhost:8080/sc
//上传以后变为E:\software\apache-tomcat-6.0.45\webapps\sc
return savePath;
}
public void setSavePath(String savePath) {
//E:\software\apache-tomcat-6.0.45\webapps\sc/myupload
this.savePath = ServletActionContext.getServletContext().getRealPath("/myupload");
}*/
public String execute() throws IOException{
System.out.println(title);//标题
System.out.println(uploadContentType);//准备上传的文件的文件类型
System.out.println(uploadFileName);//准备上传的文件的文件名,记住还有扩展名
System.out.println(upload);
String realPath=ServletActionContext.getServletContext().getRealPath("/");
String path=realPath+"myupload/"+uploadFileName;
System.out.println(realPath);
System.out.println(path);
FileInputStream fis=new FileInputStream(upload);
FileOutputStream fos=new FileOutputStream(path);
byte[] bytes=new byte[1024];//定义一个1024大小的字节数组
int len=-1;//用来做标志位
while((len=fis.read(bytes))>0){
fos.write(bytes, 0, len);
}
return null;
}
}
（5）JSP页面的编写
<%@ page contentType="text/html;charset=utf-8"%>
<!-- enctype="multipart/form-data",这个是最重要的配置 -->
<form action="myupload.action" enctype="multipart/form-data" method="post">
文件名：<input type="text" name="title"/><br/>
上传：<input type="file" name="upload"/><br/>
<input type="submit" value="上传"/>
</form>
经过本次的总结，感觉struts2框架下的单文件的上传还是十分简单的，只需要获取要存储在什么地方的地址，然后再通过输入输出流，写到这一个地址中去即可。绝大部分工作，struts2已经帮咱们做好了。