Struts2之文件上传(单文件/多文件)



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”/>

 

<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

 

  1. <%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
  2. <%
  3. String path = request.getContextPath();
  4. String basePath = request.getScheme()+”://”+request.getServerName()+”:”+request.getServerPort()+path+”/”;
  5. %>
  7. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
  8. <html>
  9.   <head>
  10.     <base href=”<%=basePath%>”>
  12.     <title>My JSP ‘fileupload.jsp’ starting page</title>
  14.     <meta http-equiv=”pragma” content=”no-cache”>
  15.     <meta http-equiv=”cache-control” content=”no-cache”>
  16.     <meta http-equiv=”expires” content=”0″>
  17.     <meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
  18.     <meta http-equiv=”description” content=”This is my page”>
  19.     <!–
  20.     <link rel=”stylesheet” type=”text/css” href=”styles.css”>
  21.     –>
  23.   </head>
  25.   <body>
  26.      <!– enctype 默认是 application/x-www-form-urlencoded –>
  27.      <form action=”FileUpload2″ enctype=”multipart/form-data” method=”post” >
  29.                用户名：<input type=”text” name=”usename”> <br/>
  30.                上传文件：<input type=”file” name=”file1″><br/>
  32.               <input type=”submit” value=”提交”/>
  34.      </form>
  38.   </body>
  39. </html>
<%@ 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

 

 

  1. package com.struts2.fileupload;
  3. import java.io.File;
  4. import java.io.FileInputStream;
  5. import java.io.FileOutputStream;
  6. import java.io.InputStream;
  7. import java.io.OutputStream;
  9. import org.apache.struts2.ServletActionContext;
  11. import com.opensymphony.xwork2.ActionSupport;
  13. /**
  14. * 单个文件上传
  15. * @author Administrator
  16. * 上传文件其实是上传了两份，
  17. *
  18. * 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
  19. * 默认是空的
  20. * 保存在  Tomcat 6.0\work\Catalina\localhost\struts2目录下以.tmp后缀名的文件
  21. *
  22. * 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,
  23. * 覆盖  default.properties 的某些键值
  24. *
  25. * 还有一份是 存放在自己设定的目录下
  26. */
  27. public class FileUpload extends ActionSupport {
  29.     private String usename ;
  30.     private File file1 ; //具体上传文件的 引用 , 指向临时目录中的临时文件
  31.     private String file1FileName ;  // 上传文件的名字 ,FileName 固定的写法
  32.     private String file1ContentType ; //上传文件的类型， ContentType 固定的写法
  34.     public String getUsename() {
  35.         return usename;
  36.     }
  37.     public void setUsename(String usename) {
  38.         this.usename = usename;
  39.     }
  40.     public File getFile1() {
  41.         return file1;
  42.     }
  43.     public void setFile1(File file1) {
  44.         this.file1 = file1;
  45.     }
  46.     public String getFile1FileName() {
  47.         return file1FileName;
  48.     }
  49.     public void setFile1FileName(String file1FileName) {
  50.         this.file1FileName = file1FileName;
  51.     }
  52.     public String getFile1ContentType() {
  53.         return file1ContentType;
  54.     }
  55.     public void setFile1ContentType(String file1ContentType) {
  56.         this.file1ContentType = file1ContentType;
  57.     }
  59.     @Override
  60.     public String execute() throws Exception {
  61.         //获取文件存储路径
  62.         String path = ServletActionContext.getRequest().getRealPath(“/upload”);
  63.         //输出流
  64.         OutputStream os = new FileOutputStream(new File(path,file1FileName));
  65.         //输入流
  66.         InputStream is = new FileInputStream(file1);
  68.         byte[] buf = new byte[1024];
  69.         int length = 0 ;
  71.         while(-1 != (length = is.read(buf) ) )
  72.         {
  73.             os.write(buf, 0, length) ;
  74.         }
  75.         is.close();
  76.         os.close();
  78.         return SUCCESS;
  79.     }
  84. }
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

 


 

  1. <%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
  2. <%@ taglib prefix=”s” uri=”/struts-tags” %>
  4. <%
  5. String path = request.getContextPath();
  6. String basePath = request.getScheme()+”://”+request.getServerName()+”:”+request.getServerPort()+path+”/”;
  7. %>
  9. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
  10. <html>
  11.   <head>
  12.     <base href=”<%=basePath%>”>
  14.     <title>My JSP ‘filedemo.jsp’ starting page</title>
  16.     <meta http-equiv=”pragma” content=”no-cache”>
  17.     <meta http-equiv=”cache-control” content=”no-cache”>
  18.     <meta http-equiv=”expires” content=”0″>
  19.     <meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
  20.     <meta http-equiv=”description” content=”This is my page”>
  21.     <!–
  22.     <link rel=”stylesheet” type=”text/css” href=”styles.css”>
  23.     –>
  25.   </head>
  27.   <body>
  28.     上传成功: <br/>
  29.     usename: <s:property value=”usename” /><br/>
  30.     file: <s:property value=”file1FileName”/><br/>
  31.     contentType: <s:property value=”file1ContentType”/>
  33.   </body>
  34. </html>
<%@ 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

 

  1. <%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
  2. <%
  3. String path = request.getContextPath();
  4. String basePath = request.getScheme()+”://”+request.getServerName()+”:”+request.getServerPort()+path+”/”;
  5. %>
  7. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
  8. <html>
  9.   <head>
  10.     <base href=”<%=basePath%>”>
  12.     <title>My JSP ‘fileupload.jsp’ starting page</title>
  14.     <meta http-equiv=”pragma” content=”no-cache”>
  15.     <meta http-equiv=”cache-control” content=”no-cache”>
  16.     <meta http-equiv=”expires” content=”0″>
  17.     <meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
  18.     <meta http-equiv=”description” content=”This is my page”>
  19.     <!–
  20.     <link rel=”stylesheet” type=”text/css” href=”styles.css”>
  21.     –>
  23.   </head>
  25.   <body>
  26.      <!– enctype 默认是 application/x-www-form-urlencoded –>
  27.      <form action=”FileUpload2″ enctype=”multipart/form-data” method=”post” >
  29.                用户名：<input type=”text” name=”usename”> <br/>
  30.                上传文件：<input type=”file” name=”file1″><br/>
  31.                上传文件： <input type=”file” name=”file1″><br/> <!– 两个名字相同 都是file1 –>
  32.               <input type=”submit” value=”提交”/>
  34.      </form>
  38.   </body>
  39. </html>
<%@ 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

 

  1. package com.struts2.fileupload;
  3. import java.io.File;
  4. import java.io.FileInputStream;
  5. import java.io.FileOutputStream;
  6. import java.io.InputStream;
  7. import java.io.OutputStream;
  8. import java.util.List;
  10. import org.apache.struts2.ServletActionContext;
  12. import com.opensymphony.xwork2.ActionSupport;
  14. /**
  15. * 多文件上传，用集合的方式
  16. * @author Administrator
  17. *
  18. */
  20. public class FileUpload2 extends ActionSupport {
  22.     private String usename ;
  23.     private List<File> file1 ;
  24.     private List<String> file1FileName ;
  25.     private List<String> file1ContentType ;
  27.     public String getUsename() {
  28.         return usename;
  29.     }
  30.     public void setUsename(String usename) {
  31.         this.usename = usename;
  32.     }
  33.     public List<File> getFile1() {
  34.         return file1;
  35.     }
  36.     public void setFile1(List<File> file1) {
  37.         this.file1 = file1;
  38.     }
  39.     public List<String> getFile1FileName() {
  40.         return file1FileName;
  41.     }
  42.     public void setFile1FileName(List<String> file1FileName) {
  43.         this.file1FileName = file1FileName;
  44.     }
  45.     public List<String> getFile1ContentType() {
  46.         return file1ContentType;
  47.     }
  48.     public void setFile1ContentType(List<String> file1ContentType) {
  49.         this.file1ContentType = file1ContentType;
  50.     }
  52.     @Override
  53.     public String execute() throws Exception {
  55.         //获取文件存储路径
  56.         String path = ServletActionContext.getRequest().getRealPath(“/upload”);
  58.         for(int i = 0 ; i < file1.size() ; i++ )
  59.         {
  60.             OutputStream os = new FileOutputStream(new File(path,file1FileName.get(i)));
  62.             InputStream is = new FileInputStream(file1.get(i));
  64.             byte[] buf = new byte[1024];
  65.             int length = 0 ;
  67.             while(-1 != (length = is.read(buf) ) )
  68.             {
  69.                 os.write(buf, 0, length) ;
  70.             }
  72.             is.close();
  73.             os.close();
  75.         }
  77.         return SUCCESS;
  78.     }
  80. }
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

 

 

  1. <%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
  2. <%@ taglib prefix=”s” uri=”/struts-tags” %>
  4. <%
  5. String path = request.getContextPath();
  6. String basePath = request.getScheme()+”://”+request.getServerName()+”:”+request.getServerPort()+path+”/”;
  7. %>
  9. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
  10. <html>
  11.   <head>
  12.     <base href=”<%=basePath%>”>
  14.     <title>My JSP ‘filedemo2.jsp’ starting page</title>
  16.     <meta http-equiv=”pragma” content=”no-cache”>
  17.     <meta http-equiv=”cache-control” content=”no-cache”>
  18.     <meta http-equiv=”expires” content=”0″>
  19.     <meta http-equiv=”keywords” content=”keyword1,keyword2,keyword3″>
  20.     <meta http-equiv=”description” content=”This is my page”>
  21.     <!–
  22.     <link rel=”stylesheet” type=”text/css” href=”styles.css”>
  23.     –>
  25.   </head>
  27.   <body>
  28.               上传成功：<br/>
  29.      usename:<s:property value=”usename”/><br/>
  30.               <!– 遍历值 –>
  31.               <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 –>
  32.                                                  文件:<s:property value=”#f”/> <br/>
  33.                <!– 这里也可以调用方法  <s:property value=”#f.toUpperCase()”/> –>
  34.               </s:iterator>
  37.   </body>
  38. </html>
<%@ 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”> <!– 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()”/> –>

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

 

下载链接：

1）Servlet 文件上传 ———— 点击打开链接

2）Struts2之下载  点击打开链接

http://blog.csdn.net/hzc543806053/article/details/7526306