java Struts2框架下实现文件上传功能

本文实例为大家分享了struts2框架实现文件上传的方法，供大家参考，具体内容如下

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;//前缀必须要是上面的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>

　　

经过这次总结，感觉struts2框架下的单文件的上传还是非常简单的，只要获取要存储在什么地方的地址，再通过输入输出流，写到这个地址中去就行了。绝大部分工作，struts2已经帮我们做好了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。