Struts2文件上传（转）

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Struts Java Apache JSP freemarker

Struts2使用开源项目Apache Jakarta Commons FileUpload和内建的FileUploadInterceptor拦截器实现文件上传，所需的jar包如下：

commons-logging-1.1.jar
freemarker-2.3.8.jar
ognl-2.6.11.jar
struts2-core-2.0.6.jar
xwork-2.0.1.jar
commons-io-1.3.1.jar
commons-fileupload-1.2.jar

★ 文件上传页面 fileupload.jsp

<%@ page language="java" contentType="text/html; charset=GBK"%>   
<%@ taglib prefix="s" uri="/struts-tags" %>   
   
<html>   
  <head>   
  <head>   
      
  <body>   
    <s:form action="fileUpload" method="post" enctype="multipart/form-data">   
      <s:file name="doc" label="File"/>   
      <s:submit/>   
    <s:form>   
  <body>   
<html>

这里需要注意的是，form的enctype属性必须设置为multipart/form-data。
★ 处理文件上传 FileUploadAction.java

package fileupload;    
   
import java.io.File;    
import java.text.DateFormat;    
import java.text.SimpleDateFormat;    
import java.util.Date;    
import java.util.Random;    
   
import javax.servlet.ServletContext;    
   
import org.apache.commons.io.FileUtils;    
import org.apache.struts2.util.ServletContextAware;    
   
import com.opensymphony.xwork2.ActionSupport;    
   
public class FileUploadAction extends ActionSupport implements ServletContextAware {    
        
    private static final long serialVersionUID = -5016873153441103539L;    
        
    private File doc;    
    private String fileName;    
    private String contentType;    
        
    private ServletContext context;    
            
    public void setDoc(File file) {    
        this.doc = file;    
    }    
        
    public void setDocFileName(String fileName) {    
        this.fileName = fileName;    
    }    
        
    public void setDocContentType(String contentType) {    
        this.contentType = contentType;    
    }    
        
    public void setServletContext(ServletContext context) {    
        this.context = context;    
    }    
        
    public String execute() throws Exception {    
        String targetDirectory = context.getRealPath("/upload");    
        String targetFileName = generateFileName(fileName);    
        File target = new File(targetDirectory, targetFileName);    
            
        FileUtils.copyFile(doc, target);    
            
        return SUCCESS;    
    }    
        
    private String generateFileName(String fileName) {    
        DateFormat format = new SimpleDateFormat("yyMMddHHmmss");    
        String formatDate = format.format(new Date());    
            
        int random = new Random().nextInt(10000);    
            
        int position = fileName.lastIndexOf(".");    
        String extension = fileName.substring(position);    
            
        return formatDate + random + extension;    
    }       
}

在fileupload.jsp中，只有doc一个字段，而FileUploadAction.java中，却有三个字段，Struts2怎么通过页面的一个字段设置Action里的三个字段呢？没错，这就是FileUploadInterceptor的功劳了！你所要做的只是按照一定的样式命名这三个字段的set方法，而字段名可以任意命名。第一个File类型的字段的set方法还是以常规的方式命名，另两个String类型的字段的set方法必须分别以“File字段的set方法名+FileName”和“File字段的set方法名+ContentType”来命名。

★ 配置文件 struts.xml

<?xml version="1.0" encoding="UTF-8" ?>   
<!DOCTYPE struts PUBLIC    
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    
        "http://struts.apache.org/dtds/struts-2.0.dtd">   
   
<struts>   
   
    <package name="fileupload" namespace="/fileupload" extends="struts-default">   
            
        <action name="fileUpload" class="fileupload.FileUploadAction">   
            <result>/fileupload/upload_success.jsp</result>   
        </action>   
        
    </package>  
   
</struts>

★ 配置文件 web.xml

<?xml version="1.0" encoding="UTF-8"?>   
<web-app version="2.4"     
    xmlns="http://java.sun.com/xml/ns/j2ee"     
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee     
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">   
        
    <filter>   
        <filter-name>struts-cleanup</filter-name>   
        <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>   
    </filter>   
        
    <filter>   
        <filter-name>struts2</filter-name>   
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>   
    </filter>   
        
    <filter-mapping>   
        <filter-name>struts-cleanup</filter-name>   
        <url-pattern>/*</url-pattern>   
    </filter-mapping>   
        
    <filter-mapping>   
        <filter-name>struts2</filter-name>   
        <url-pattern>/*</url-pattern>   
    </filter-mapping>   
   
</web-app>

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