Struts2實現單文件或多文件上傳功能

發布時間：2020-10-02 19:31:25 來源：腳本之家閱讀：114 作者：hzc543806053 欄目：編程語言

一、簡述

Struts2的文件上傳其實也是通過攔截器來實現的，只是該攔截器定義為默認攔截器了，所以不用自己去手工配置，<interceptor name="fileUpload" class="org.apache.struts2.interceptor.FileUploadInterceptor"/>

二、指定用戶上傳文件的大小，有兩種方式

1）默認是在default.properties 文件的 struts.multipart.maxSize=2097152 鍵值指定為2097152 也就是2M，通過計算 2097152/(1024*1024) = 2 M

那我們可以改變其默認值，只要在src目錄下，新建一個 struts.properties 文件，指定上傳大小如下：

Struts2實現單文件或多文件上傳功能

一次上傳只可以上傳10M，不管一次上傳多少個文件，按總和計算

2）在struts.xml文件中指定，如圖：

Struts2實現單文件或多文件上傳功能

其實name就對應struts.properties的鍵，value對應值

注意：如果即在struts.properties設定文件上傳大小，又在struts.xml 設定文件上傳大小，則struts.properties的優先級高于struts.xml，一般在一處指定上傳大小即可，推薦 struts.properties

三、Struts2之單文件上傳

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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
  
 <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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 --> 
 
 </head> 
 
 <body> 
  <!-- enctype 默認是 application/x-www-form-urlencoded --> 
  <form action="FileUpload2" enctype="multipart/form-data" method="post" > 
   
    用戶名：<input type="text" name="usename"> <br/> 
    上傳文件：<input type="file" name="file1"><br/> 
     
    <input type="submit" value="提交"/> 
  
  </form> 
  
  
  
 </body> 
</html>

2.具體處理上傳的 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; 
 
/** 
 * 單個文件上傳 
 * @author Administrator 
 * 上傳文件其實是上傳了兩份， 
 * 
 * 首先將上傳的文件保存到 default.properties 文件中 struts.multipart.saveDir鍵指定的目錄中 
 * 默認是空的 
 * 保存在 Tomcat 6.0\work\Catalina\localhost\struts2目錄下以.tmp后綴名的文件 
 * 
 * 如果要在 struts.multipart.saveDir 指定目錄， 則可以在 src文件夾下 建一個 struts.properties, 
 * 覆蓋 default.properties 的某些鍵值 
 * 
 * 還有一份是 存放在自己設定的目錄下 
 */ 
public class FileUpload extends ActionSupport { 
  
 private String usename ; 
 private File file1 ; //具體上傳文件的 引用 , 指向臨時目錄中的臨時文件 
 private String file1FileName ; // 上傳文件的名字 ,FileName 固定的寫法 
 private String file1ContentType ; //上傳文件的類型， ContentType 固定的寫法 
  
 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 { 
  //獲取文件存儲路徑 
  String path = ServletActionContext.getRequest().getRealPath("/upload"); 
  //輸出流 
  OutputStream os = new FileOutputStream(new File(path,file1FileName)); 
  //輸入流 
  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.最終顯示結果的頁面，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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
  
 <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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 --> 
 
 </head> 
 
 <body> 
 上傳成功: <br/> 
 usename: <s:property value="usename" /><br/> 
 file: <s:property value="file1FileName"/><br/> 
 contentType: <s:property value="file1ContentType"/> 
  
 </body> 
</html>

四、Struts2之多文件上傳

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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
  
 <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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 --> 
 
 </head> 
 
 <body> 
  <!-- enctype 默認是 application/x-www-form-urlencoded --> 
  <form action="FileUpload2" enctype="multipart/form-data" method="post" > 
   
    用戶名：<input type="text" name="usename"> <br/> 
    上傳文件：<input type="file" name="file1"><br/> 
    上傳文件： <input type="file" name="file1"><br/> <!-- 兩個名字相同 都是file1 --> 
    <input type="submit" value="提交"/> 
  
  </form> 
  
  
  
 </body> 
</html>

兩個上傳文件的name屬性值要是一樣的，后臺方便處理

2.具體處理上傳文件的FileUpload2.java

多文件上傳用集合的方式

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; 
 
/** 
 * 多文件上傳，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 { 
   
  //獲取文件存儲路徑 
  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.用于顯示的界面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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
  
 <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" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 --> 
 
 </head> 
 
 <body> 
    上傳成功：<br/> 
  usename:<s:property value="usename"/><br/> 
    <!-- 遍歷值 --> 
    <s:iterator value="file1FileName" id="f"> <!-- id是一個對象，目前是一個字符串集合 可任意命名 --> 
             文件:<s:property value="#f"/> <br/> 
    <!-- 這里也可以調用方法 <s:property value="#f.toUpperCase()"/> --> 
    </s:iterator> 
  
  
 </body> 
</html>

遍歷集合的方式，用struts2提供的標簽 iterator 可以實現

<s:iterator value="file1FileName" id="f"> <!-- id是一個對象，目前是一個字符串集合 可任意命名-->
    文件:<s:property value="#f"/> <br/> 
    <!-- 這里也可以調用方法 <s:property value="#f.toUpperCase()"/> -->
    toUpperCase()字符串的方法是把字母轉為大寫
</s:iterator>

下載鏈接：

1）Servlet 文件上傳點擊打開鏈接
2）Struts2之下載點擊打開鏈接

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。

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