Struts2多文件上传

struts2 MVC作为一个新框架，功能强大，比之以前的版本1.x 强过不少。
无论是学习还是开发推荐 struts 2， 而且与spring ，Hibernate更易集成，可自定制需要的功能模块，还可以方便与ext 等js框架结合做ajax 开发。开发效率不错。

不多说，看一个多文件上传样例：

环境：JDK 1.6, TOMCAT 6.0, IDE:eclipse jee

主要的lib包：struts2-core-2.0.11.1.jar，xwork-2.0.4.jar，freemarker.jar，ognl-2.6.11.jar，       pull-parser-2.1.10.jar，commons-fileupload.jar 必须的包。

代码：

package org;

import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
import java.io.*;

public class UploadAction extends ActionSupport {

private static final long serialVersionUID = 1L;
private File[] doc;
private String[] docContentType;
private String[] docFilename;
private String[] caption;

public String[] getCaption() {
   return caption;
}

public void setCaption(String[] caption) {
   this.caption = caption;
}

public String[] getDocContentType() {
   return doContentType;
}

public void setdocContentType(String[] docContentType) {
   this.docContentType = docContentType;      // notice:here is the key!! 不要改变命名规范
}

public File[] getDoc() {
   return doc;
}

public void setDoc(File[] doc) {
   this.doc = doc;
}

public String[] getDocFilename() {
   return docFileName;
}

public void setDocFileName(String[] docFilename) {
   this.docFilename = docFilename;       // notice:here is the key!! 命名约定
}

private static void copy(File src, File dst) {
   try {
    InputStream in = null;
    OutputStream out = null;
    try {
     in = new BufferedInputStream(new FileInputStream(src));
     out = new BufferedOutputStream(new FileOutputStream(dst));
     byte[] buffer = new byte[16 * 1024];
     while (in.read(buffer) > 0) {
      out.write(buffer);
     }
    } finally {
     if (null != in) {
      in.close();
     }
     if (null != out) {
      out.close();
     }
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
}

public String execute() {
   for (int i = 0; i < this.getDoc().length; i++) {
    File imageFile = new File(ServletActionContext.getServletContext()
      .getRealPath("/")
      + "file/" + docFilename[i]);
    copy(this.getDoc()[i], imageFile);
   }
   return SUCCESS;
}

}

classes/目录下，struts.xml 文件配置：

<?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>
    <!-- developer mode convenient for Debug -->
    <constant name="struts.devMode" value="true" />
    <constant name="struts.i18n.encoding" value="GBK" />
    <package name="uploadFile" extends="struts-default">

       <action name="myUpload"
          class="org.UploadAction">
          <interceptor-ref
             name="fileUpload">
             <param
                name="allowedTypes">
                image/bmp,image/png,image/gif,image/pjpeg,image/jpg,image/JPG,image/jpeg
             </param>
             <param
                name="maximumSize">
                1024000
             </param>
          </interceptor-ref>
          <interceptor-ref
             name="defaultStack" />
          <result name="input">
             /upload.jsp
          </result>
          <result name="success">
             /showUpload.jsp
          </result>
       </action>
    </package>
</struts>

web.xml配置：

<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_3.dtd">
<web-app>
    <display-name>struts2上传文件示例</display-name>
    <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>

 

    <!-- 注意顺序 -->
    <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>

    <welcome-file-list>
       <welcome-file>upload.jsp</welcome-file>
    </welcome-file-list>
</web-app>

上传页面(ognl 表达式)：upload.jsp

<%@ page language="java" contentType="text/html;charset=gb2312"%>
<%@ 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>upload file</title>
<script type="text/javascript">  
    function addMore() {
        var td = document.getElementById("more");
        var div = document.createElement("div");
        var ss = document.createElement("span");
        var input = document.createElement("input");
        var span = document.createElement("span");
        var text = document.createElement("input");
        var button = document.createElement("input");
        div.style.marginTop = "4";
        ss.innerHTML = "选择文件:";
        input.type = "file";
        input.name = "doc";
        span.innerHTML = "文件资源描述:";
        text.type = "text";
        text.size = 35;
        text.name = "caption";
        button.type = "button";
        button.value = "移 除";
        button.onclick = function() {
            td.removeChild(div);
            div = null;
            fileInputNumber--;
        }
        div.appendChild(ss);
        div.appendChild(input);
        div.appendChild(span);
        div.appendChild(text);
        div.appendChild(button);
        td.appendChild(div);
        fileInputNumber++;
    }
</script>
</head>

<body>
<s:fielderror />
<s:form method="post" name="uploadForm" action="myUpload"
        enctype="multipart/form-data" onsubmit="return check();"
        theme="simple">
        <tr>
            <td id="more">选择文件:<input type="file" name="doc" />文件资源描述:<input
                type="text" name="caption" size="35" /><input type="button"
                value="添 加" onclick="addMore()" /></td>
        </tr>

        <tr>
            <td align="center"><s:submit value="上传" /> <s:reset value="重置" /></td>
        </tr>
    </s:form>
</body>
</html>

显示页面：showUpload.jsp

<%@ page language="java" contentType="text/html;charset=GBK"%>
<%@ 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>查看上传文件</title>
</head>
<body><center>
    <table border="1">
    <s:iterator value="uploadFilename" status="stat">
     <tr>
      <td>
       <s:property value="%{docFilename[#stat.index]}" />
       <br />
      </td>
     </tr>
     <tr>
      <td>
       <s:property value="%{caption[#stat.index]}" />
      </td>
     </tr>
     </s:iterator>
    </table>
   </center></body>
</html>