struts2的文件上传特别简单，把我做的小例子给大家看一下

upload.jsp


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< %@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
< %@ taglib prefix="s" uri="/struts-tags" %>
< %
  String path = request.getContextPath();
  pageContext.setAttribute("context",path);
%>

< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>


    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    </meta><meta http-equiv="cache-control" content="no-cache">
    </meta><meta http-equiv="expires" content="0">
    </meta><meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    </meta><meta http-equiv="description" content="This is my page">
    <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->

  <script type="text/javascript">
    function more() {

      var td = document.getElementById("more");
      var br = document.createElement("br");

      var input = document.createElement("input");
      input.type="file";
      input.name="uf.upload";

      var button = document.createElement("input");
      button.type="button";
      button.value="remove";

      td.appendChild(br);
      td.appendChild(input);
      td.appendChild(button);

      button.onclick = function() {
        td.removeChild(br);
        td.removeChild(input);
        td.removeChild(button);

      }

    }

  </script>
  </meta></head>

  <body>
    <h1>
      struts2上传不定数的文件，限制文件上传类型（struts.xml配置拦截器）
    </h1>
    <hr />
    <s :fielderror></s>
    <table align="center" border="1" width="50%">


    <s :form action="upload" enctype="multipart/form-data" method="post" theme="simple">
           <tr> 
           <td>
      用户名：
      </td>

      <td>
      <s :textfield name="uf.username"></s>
      </td>

      </tr>

       <tr> 
       <td>
      上传：
      </td>

      <td id="more">
      <s :file name="uf.upload"></s><font color="red">*只能上传.jpg文件,小于400kb</font>
 <input type="button" value="添加.." onclick="more()"/>
      </td>

      </tr>
       <tr> <td align="center">
      <s :submit value="提交"></s>
      </td>
      <td><s :reset value="重置"/></td>

      </tr>
    </s>
    </table>


</body>
</html>


我把jsp上传的内容封装成了一个类UploadFile.java,下面代码显示有点问题,泛型里的好像都出错了应该是 ,,还有最下边的一行根本就没有，没时间找显示错误的问题，说明一下


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package pojo;

import java.io.File;
import java.util.List;

public class UploadFile {
  private String username;

  private List<file> upload;

  private List<string> uploadFileName;


  private List</string><string> uploadContentType;


  public List<file> getUpload() {
    return upload;
  }


  public void setUpload(List</file><file> upload) {
    this.upload = upload;
  }


  public List<string> getUploadContentType() {
    return uploadContentType;
  }


  public void setUploadContentType(List</string><string> uploadContentType) {
    this.uploadContentType = uploadContentType;
  }


  public List</string><string> getUploadFileName() {
    return uploadFileName;
  }


  public void setUploadFileName(List</string><string> uploadFileName) {
    this.uploadFileName = uploadFileName;
  }


  public String getUsername() {
    return username;
  }


  public void setUsername(String username) {
    this.username = username;
  }


}

</string></file></string></file>


接着是struts.xml的配置：


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< ?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>

<!-- 更改字符集编码 在org.apache.struts2.default.properties 定义-->
<constant name="struts.i18n.encoding" value="UTF-8"></constant>
<constant name="struts.multipart.maxSize" value="40960000"></constant>
<!--  显示错误信息时，src下有message.properties,要在这里配置，才显示自己写的错误信息-->
    <constant name="struts.custom.i18n.resources" value="message"></constant>
        <action name="upload" class="action.UploadAction">
            <result name="success">/uploads/result.jsp</result>
            <result name="input">/uploads/upload.jsp</result>
            <interceptor -ref name="fileUpload">
            <!-- 在org.apache.struts2.interceptor.FileUploadInterceptor找限制大小和类型的参数
            限制每个每个上传文件的大小，允许上传的类型，类型在tomcat-->conf-->web.xml中寻找 -->
                <param name="maximumSize">40960000</param>
                <param name="allowedTypes">image/jpeg,image/jpeg</param>
            </interceptor>
             <!-- 默认拦截器defaultStack要显示的调用，当你调用其他的拦截器后，默认拦截器不会再自动调用 -->
            <interceptor -ref name="defaultStack"></interceptor>
        </action>



</struts>


接着看UploadAction.java


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package action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;

import org.apache.struts2.ServletActionContext;

import sjzpc.pojo.UploadFile;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

  private UploadFile uf;

  public UploadFile getUf() {
    return uf;
  }

  public void setUf(UploadFile uf) {
    this.uf = uf;
  }

  @Override
  public String execute() throws Exception {

    for(int i = 0; i < uf.getUpload().size(); i++) {//多文件上传
      InputStream is = new FileInputStream(uf.getUpload().get(i));
 //    String root = ServletActionContext.getRequest.getRealPath("/uploads"); 这个request.getRealPath()方法已过时，不建议使用
      String root = ServletActionContext.getServletContext().getRealPath("/uploads");

      OutputStream os = new FileOutputStream(new File(root,uf.getUploadFileName().get(i)));

      int len = 0;
      byte[] buffer = new byte[1024];//缓冲，提高效率


      while((len =  is.read(buffer)) > 0) {
        os.write(buffer, 0, len);
      }
                                     // 输入输出流记着一定要关闭
      os.close();
      is.close();

    }

    return "success";

  }
}


struts2多文件限制上传源码下载