Struts2之文件上传(单文件/多文件)

<一>简述：

Struts2的文件上传其实也是通过拦截器来实现的，只是该拦截器定义为默认拦截器了，所以不用自己去手工配置，<interceptor name="fileUpload" class="org.apache.struts2.interceptor.FileUploadInterceptor"/>

<二>指定用户上传文件的大小，有两种方式：

1）默认是在default.properties 文件的 struts.multipart.maxSize=2097152 键值指定为2097152 也就是2M，通过计算 2097152/(1024*1024) = 2 M

那我们可以改变其默认值，只要在src目录下，新建一个 struts.properties 文件，指定上传大小如下：

一次上传只可以上传10M，不管一次上传多少个文件，按总和计算

2）在struts.xml文件中指定，如图：

其实name就对应struts.properties的键，value对应值

注意：如果即在struts.properties设定文件上传大小，又在struts.xml 设定文件上传大小，则struts.properties的优先级高于struts.xml，一般在一处指定上传大小即可，推荐 struts.properties

<三>Struts2之单文件上传

1.fileupload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'fileupload.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
 
  </head>
  
  <body>
     <!-- enctype 默认是 application/x-www-form-urlencoded -->
     <form action="FileUpload2" enctype="multipart/form-data" method="post" >
        
               用户名：<input type="text" name="usename"> <br/>
               上传文件：<input type="file" name="file1"><br/>
               
              <input type="submit" value="提交"/>
     
     </form>
     
     
     
  </body>
</html>

2.具体处理上传的 FileUpload.java

package com.struts2.fileupload;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
 
import org.apache.struts2.ServletActionContext;
 
import com.opensymphony.xwork2.ActionSupport;
 
/**
 * 单个文件上传
 * @author Administrator
 * 上传文件其实是上传了两份，
 * 
 * 首先将上传的文件保存到 default.properties 文件中 struts.multipart.saveDir键指定的目录中
 * 默认是空的
 * 保存在  Tomcat 6.0\work\Catalina\localhost\struts2目录下以.tmp后缀名的文件
 * 
 * 如果要在 struts.multipart.saveDir 指定目录， 则可以在 src文件夹下 建一个 struts.properties,
 * 覆盖  default.properties 的某些键值
 * 
 * 还有一份是 存放在自己设定的目录下
 */
public class FileUpload extends ActionSupport {
	
	private String usename ;
	private File file1 ; //具体上传文件的 引用 , 指向临时目录中的临时文件
	private String file1FileName ;  // 上传文件的名字 ,FileName 固定的写法
	private String file1ContentType ; //上传文件的类型， ContentType 固定的写法
	
	public String getUsename() {
		return usename;
	}
	public void setUsename(String usename) {
		this.usename = usename;
	}
	public File getFile1() {
		return file1;
	}
	public void setFile1(File file1) {
		this.file1 = file1;
	}
	public String getFile1FileName() {
		return file1FileName;
	}
	public void setFile1FileName(String file1FileName) {
		this.file1FileName = file1FileName;
	}
	public String getFile1ContentType() {
		return file1ContentType;
	}
	public void setFile1ContentType(String file1ContentType) {
		this.file1ContentType = file1ContentType;
	}
	
	@Override
	public String execute() throws Exception {
		//获取文件存储路径
		String path = ServletActionContext.getRequest().getRealPath("/upload");
		//输出流
		OutputStream os = new FileOutputStream(new File(path,file1FileName));
		//输入流
		InputStream is = new FileInputStream(file1);
		
		byte[] buf = new byte[1024];
		int length = 0 ;
		
		while(-1 != (length = is.read(buf) ) )
		{
			os.write(buf, 0, length) ;
		}
		is.close();
		os.close();
		
		return SUCCESS;
	}
	
	
	
 
}

3.最终显示结果的页面，filedemo.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
 
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'filedemo.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
 
  </head>
  
  <body>
    上传成功: <br/>
    usename: <s:property value="usename" /><br/>
    file: <s:property value="file1FileName"/><br/>
    contentType: <s:property value="file1ContentType"/>
    
  </body>
</html>

<四>Struts2之多文件上传

1.fileupload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'fileupload.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
 
  </head>
  
  <body>
     <!-- enctype 默认是 application/x-www-form-urlencoded -->
     <form action="FileUpload2" enctype="multipart/form-data" method="post" >
        
               用户名：<input type="text" name="usename"> <br/>
               上传文件：<input type="file" name="file1"><br/>
               上传文件： <input type="file" name="file1"><br/> <!-- 两个名字相同 都是file1 -->
              <input type="submit" value="提交"/>
     
     </form>
     
     
     
  </body>
</html>

两个上传文件的name属性值要是一样的，后台方便处理

2.具体处理上传文件的FileUpload2.java

多文件上传用集合的方式

package com.struts2.fileupload;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
 
import org.apache.struts2.ServletActionContext;
 
import com.opensymphony.xwork2.ActionSupport;
 
/**
 * 多文件上传，用集合的方式
 * @author Administrator
 *
 */
 
public class FileUpload2 extends ActionSupport {
	
	private String usename ;
	private List<File> file1 ;
	private List<String> file1FileName ;
	private List<String> file1ContentType ;
	
	public String getUsename() {
		return usename;
	}
	public void setUsename(String usename) {
		this.usename = usename;
	}
	public List<File> getFile1() {
		return file1;
	}
	public void setFile1(List<File> file1) {
		this.file1 = file1;
	}
	public List<String> getFile1FileName() {
		return file1FileName;
	}
	public void setFile1FileName(List<String> file1FileName) {
		this.file1FileName = file1FileName;
	}
	public List<String> getFile1ContentType() {
		return file1ContentType;
	}
	public void setFile1ContentType(List<String> file1ContentType) {
		this.file1ContentType = file1ContentType;
	}
	
	@Override
	public String execute() throws Exception {
		
		//获取文件存储路径
		String path = ServletActionContext.getRequest().getRealPath("/upload");
		
		for(int i = 0 ; i < file1.size() ; i++ )
		{
			OutputStream os = new FileOutputStream(new File(path,file1FileName.get(i)));
			
			InputStream is = new FileInputStream(file1.get(i));
			
			byte[] buf = new byte[1024];
			int length = 0 ;
			
			while(-1 != (length = is.read(buf) ) )
			{
				os.write(buf, 0, length) ;
			}
			
			is.close();
			os.close();
			
		}
		
		return SUCCESS;
	}
 
}

3.用于显示的界面filedemo.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
 
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'filedemo2.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
 
  </head>
  
  <body>
              上传成功：<br/>
     usename:<s:property value="usename"/><br/>
              <!-- 遍历值 -->
              <s:iterator value="file1FileName" id="f"> <!-- id是一个对象，目前是一个字符串集合  可任意命名 -->
                                                 文件:<s:property value="#f"/> <br/>  
               <!-- 这里也可以调用方法  <s:property value="#f.toUpperCase()"/> -->
              </s:iterator>
    
    
  </body>
</html>

遍历集合的方式，用struts2提供的标签 iterator 可以实现

<s:iterator value="file1FileName" id="f"> 
                                                 文件:<s:property value="#f"/> <br/>

toUpperCase()字符串的方法是把字母转为大写
</s:iterator>

以上转自https://blog.csdn.net/hzc543806053/article/details/7526306

Struts2之文件上传(单文件/多文件)

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