struts2 实现多文件限制上传

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

< %@ 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

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：

< ?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

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

posted on 2009-12-11 13:42 草原和大树阅读(1253) 评论(1) 编辑收藏举报