Spring整合Struts2實現多檔案上傳及下載
阿新 • • 發佈：2019-02-11
Sping與Struts環境的搭建在前文已經講述過了，再次就不再做過多介紹了，詳情請參考前文《Spring整合Struts2中攔截鏈與註解的使用 》。接下來進入正題，Struts2的多檔案上傳步驟。本文仍然沿用Spring框架對Struts2框架進行管理，首先來看web.xml檔案：
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:config/applicationContext-*.xml</param-value> </context-param> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> <init-param> <param-name>config</param-name> <param-value>struts-default.xml,struts-plugin.xml,config/struts.xml</param-value> </init-param> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
為了方便維護，我將一般常用變數放入struts.xml檔案，通過include標籤將struts-upload.xml檔案引入到struts.xml檔案中，其配置內容分別如下：
<?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.xml檔案 --> <struts> <include file="config/struts-upload.xml"></include> <constant name="struts.action.extension" value=","></constant> <!-- 上傳檔案是所允許的檔案最大值 --> <constant name="struts.multipart.maxSize" value="40000000"></constant> <!-- 設定檔案上傳時的臨時資料夾時F盤下的temp資料夾 --> <constant name="struts.multipart.saveDir" value="F:\\temp"></constant> </struts> <!-- struts-upload.xml檔案 --> <struts> <package name="upload" namespace="/file" extends="struts-default"> <action name="upload" class="uploadAction"> <result name="success">/success.jsp</result> <result name="error">/error.jsp</result> <result name="input">/filetoolargeerror.jsp</result> <param name="maximumSize">1000000</param> <param name="allowedTypes">text/plain,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document</param> </action> <action name="download" class="downloadAction"> <result name="success" type="stream"> <param name="inputName">fileInput</param> <param name="contentDisposition">attachment;filename="${fileName}"</param> </result> </action> </package> </struts>
接下來是applicationContext-bean.xml檔案，該檔案中通過對映將struts-upload.xml檔案中的action名稱與真實的javabean進行對映：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd" > <!-- Spring管理Struts2的Action --> <bean name="uploadAction" class="com.yang.action.UploadAction" scope="prototype"></bean> <bean name="downloadAction" class="com.yang.action.DownloadAction" scope="prototype"></bean> </beans>
具體處理檔案上傳和下載的Action，分別為UploadAction和DownloadAction：
package com.yang.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private List<File> uploads;
private List<String> uploadFileName;
private List<String> uploadContentType;
private long maximumSize;
private String allowedTypes;
public List<File> getUpload() {
return uploads;
}
public void setUpload(List<File> uploads) {
this.uploads = uploads;
}
public List<String> getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}
public List<String> getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}
public long getMaximumSize() {
return maximumSize;
}
public void setMaximumSize(long maximumSize) {
this.maximumSize = maximumSize;
}
public String getAllowedTypes() {
return allowedTypes;
}
public void setAllowedTypes(String allowedTypes) {
this.allowedTypes = allowedTypes;
}
public String execute() throws Exception {
//取得檔案上傳路徑（用於存放上傳的檔案）
File uploadFile = new File(ServletActionContext.getServletContext().getRealPath("upload"));
//判斷上述路徑是否存在，如果不存在則建立該路徑
if (!uploadFile.exists()) {
uploadFile.mkdir();
}
if(uploads != null){
String[] allowedTypesStr = allowedTypes.split(",");
//將允許的檔案型別列表放入List中
List allowedTypesList = new ArrayList();
for(int i = 0;i < allowedTypesStr.length; i++){
allowedTypesList.add(allowedTypesStr[i]);
}
//判斷上傳檔案的型別是否是允許的型別之一
for(int i = 0; i < uploads.size();i++){
if(!allowedTypesList.contains(uploadContentType.get(i))){
System.out.println("上傳檔案中包含非法檔案型別");
ServletActionContext.getServletContext().setAttribute("errorMsg", "上傳檔案中包含非法檔案型別");
return "error";
}
}
//判斷檔案的大小
for(int i = 0 ;i < uploads.size();i++){
System.out.println(uploads.get(i).length());
// 判斷檔案長度
if (maximumSize < uploads.get(i).length()) {
ServletActionContext.getServletContext().setAttribute("errorMsg", uploadFileName.get(i)+ "檔案過大");
return "error";
}
}
for(int i = 0; i < uploads.size();i++){
// 第一種檔案上傳的讀寫方式
FileInputStream input = new FileInputStream(uploads.get(i));
FileOutputStream out = new FileOutputStream(uploadFile + "\\" + uploadFileName.get(i));
try{
byte[] b = new byte[1024];
int m = 0;
while ((m = input.read(b)) > 0) {
out.write(b, 0, m);
}
}catch(Exception e){
e.printStackTrace();
ServletActionContext.getServletContext().setAttribute("errorMsg", uploadFileName.get(i) + "上傳過程中發生未知錯誤，請聯絡管理員。上傳失敗！");
return "error";
}finally{
input.close();
out.close();
//刪除臨時檔案
uploads.get(i).delete();
}
}
return "success";
}else{
ServletActionContext.getServletContext().setAttribute("errorMsg", "請選擇上傳檔案");
return "error";
}
}
}
package com.yang.action;
import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
public class DownloadAction {
private InputStream fileInput;
private String fileName;
public InputStream getFileInput() {
return fileInput;
// return ServletActionContext.getServletContext().getResourceAsStream("upload\\" + fileName);
}
public void setFileInput(InputStream fileInput) {
this.fileInput = fileInput;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public String execute() throws Exception {
fileInput = ServletActionContext.getServletContext().getResourceAsStream("upload\\" + fileName);
return "success";
}
}
最後是前臺介面upload.jsp和download.jsp，其頁面程式碼如下：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>upload</title>
</head>
<body>
<form action="file/upload" method="post" enctype="multipart/form-data">
<input type="file" name="upload">
<input type="file" name="upload">
<input type="file" name="upload">
<input type="submit" name="btnUpload" value="上傳">
</form>
</body>
</html>
<title>download</title>
</head>
<body>
<a href="file/download?fileName=123.txt">123.txt</a>
</body>
</html>
以上內容為實現多檔案上傳以及問價下載的例項。在接下來的文章中將會介紹Spring與Hibernate整合的使用。