基于Struts2的文件上传
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基于Struts2的文件上传
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Struts2本身并沒提供上傳的組件，我們可以通過調用上傳框架來實現文件的上傳。
<% ?? 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>Struts2文件上傳</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> ?? ???<center> ?? ????<h1>Struts?2完成上傳</h1> ?? ??????<form?action="upload.action"?method="post"?enctype="multipart/form-data"> ?? ????????<table> ?? ????????????<tr> ?? ????????????????<td>用戶名:</td> ?? ????????????????<td><input?type="text"?name="username"?></td> ?? ????????????</tr> ?? ????????????<tr> ?? ????????????????<td>上傳文件:</td> ?? ????????????????<td><input?type="file"?name="myFile"></td> ?? ????????????</tr> ?? ????????????<tr> ?? ????????????????<td><input?type="submit"?value="上傳"></td> ?? ????????????????<td><input?type="reset"></td> ?? ????????????</tr> ?? ????????</table> ?? ??????</form> ?? ??</center> ?? ??</body> ?? </html>??
<%
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>Struts2文件上傳</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><center><h1>Struts 2完成上傳</h1><form action="upload.action" method="post" enctype="multipart/form-data"><table><tr><td>用戶名:</td><td><input type="text" name="username" ></td></tr><tr><td>上傳文件:</td><td><input type="file" name="myFile"></td></tr><tr><td><input type="submit" value="上傳"></td><td><input type="reset"></td></tr></table></form></center></body>
</html>
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; ?? ?? public?class?UploadAction?extends?ActionSupport?{ ?? ????//?username屬性用來封裝用戶名 ?? ????private?String?username; ?? ???? ?? ????//?myFile屬性用來封裝上傳的文件 ?? ????private?File?myFile; ?? ???? ?? ????//?myFileContentType屬性用來封裝上傳文件的類型 ?? ????private?String?myFileContentType; ?? ?? ????//?myFileFileName屬性用來封裝上傳文件的文件名 ?? ????private?String?myFileFileName; ?? ?? ???? ?? ????//獲得username值 ?? ????public?String?getUsername()?{ ?? ????????return?username; ?? ????} ?? ?? ????//設置username值 ?? ????public?void?setUsername(String?username)?{ ?? ????????this.username?=?username; ?? ????} ?? ?? ????//獲得myFile值 ?? ????public?File?getMyFile()?{ ?? ????????return?myFile; ?? ????} ?? ?? ????//設置myFile值 ?? ????public?void?setMyFile(File?myFile)?{ ?? ????????this.myFile?=?myFile; ?? ????} ?? ?? ????//獲得myFileContentType值 ?? ????public?String?getMyFileContentType()?{ ?? ????????return?myFileContentType; ?? ????} ?? ?? ????//設置myFileContentType值 ?? ????public?void?setMyFileContentType(String?myFileContentType)?{ ?? ????????this.myFileContentType?=?myFileContentType; ?? ????} ?? ?? ????//獲得myFileFileName值 ?? ????public?String?getMyFileFileName()?{ ?? ????????return?myFileFileName; ?? ????} ?? ?? ????//設置myFileFileName值 ?? ????public?void?setMyFileFileName(String?myFileFileName)?{ ?? ????????this.myFileFileName?=?myFileFileName; ?? ????} ?? ?? ????public?String?execute()?throws?Exception?{ ?? ???????? ?? ????????//基于myFile創建一個文件輸入流 ?? ????????InputStream?is?=?new?FileInputStream(myFile); ?? ???????? ?? ????????//?設置上傳文件目錄 ?? ????????String?uploadPath?=?ServletActionContext.getServletContext() ?? ????????????????.getRealPath("/upload"); ?? ???????? ?? ????????//?設置目標文件 ?? ????????File?toFile?=?new?File(uploadPath,?this.getMyFileFileName()); ?? ???????? ?? ????????//?創建一個輸出流 ?? ????????OutputStream?os?=?new?FileOutputStream(toFile); ?? ?? ????????//設置緩存 ?? ????????byte[]?buffer?=?new?byte[1024]; ?? ?? ????????int?length?=?0; ?? ?? ????????//讀取myFile文件輸出到toFile文件中 ?? ????????while?((length?=?is.read(buffer))?>?0)?{ ?? ????????????os.write(buffer,?0,?length); ?? ????????} ?? ????????System.out.println("上傳用戶"+username); ?? ????????System.out.println("上傳文件名"+myFileFileName); ?? ????????System.out.println("上傳文件類型"+myFileContentType); ?? ????????//關閉輸入流 ?? ????????is.close(); ?? ???????? ?? ????????//關閉輸出流 ?? ????????os.close(); ?? ???????? ?? ????????return?SUCCESS; ?? ????} ?? ?? }??
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;public class UploadAction extends ActionSupport {// username屬性用來封裝用戶名private String username;// myFile屬性用來封裝上傳的文件private File myFile;// myFileContentType屬性用來封裝上傳文件的類型private String myFileContentType;// myFileFileName屬性用來封裝上傳文件的文件名private String myFileFileName;//獲得username值public String getUsername() {return username;}//設置username值public void setUsername(String username) {this.username = username;}//獲得myFile值public File getMyFile() {return myFile;}//設置myFile值public void setMyFile(File myFile) {this.myFile = myFile;}//獲得myFileContentType值public String getMyFileContentType() {return myFileContentType;}//設置myFileContentType值public void setMyFileContentType(String myFileContentType) {this.myFileContentType = myFileContentType;}//獲得myFileFileName值public String getMyFileFileName() {return myFileFileName;}//設置myFileFileName值public void setMyFileFileName(String myFileFileName) {this.myFileFileName = myFileFileName;}public String execute() throws Exception {//基于myFile創建一個文件輸入流InputStream is = new FileInputStream(myFile);// 設置上傳文件目錄String uploadPath = ServletActionContext.getServletContext().getRealPath("/upload");// 設置目標文件File toFile = new File(uploadPath, this.getMyFileFileName());// 創建一個輸出流OutputStream os = new FileOutputStream(toFile);//設置緩存byte[] buffer = new byte[1024];int length = 0;//讀取myFile文件輸出到toFile文件中while ((length = is.read(buffer)) > 0) {os.write(buffer, 0, length);}System.out.println("上傳用戶"+username);System.out.println("上傳文件名"+myFileFileName);System.out.println("上傳文件類型"+myFileContentType);//關閉輸入流is.close();//關閉輸出流os.close();return SUCCESS;}}
<!DOCTYPE?struts?PUBLIC ?? ????"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.0//EN"?? ????"http://struts.apache.org/dtds/struts-2.0.dtd"> ?? <struts> ?? ?? ????<package?name="struts2"?extends="struts-default"> ?? ????????<action?name="upload"?class="net.hncu.struts2.action.UploadAction"> ?? ????????????<result?name="success">/result.jsp</result> ?? ????????????<result?name="input">/upload.jsp</result> ?? ????????</action> ?? ????</package> ?? ?? ????<!--?Add?packages?here?--> ?? ?? </struts>??
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd">
<struts><package name="struts2" extends="struts-default"><action name="upload" class="net.hncu.struts2.action.UploadAction"><result name="success">/result.jsp</result><result name="input">/upload.jsp</result></action></package><!-- Add packages here --></struts>
一、配置上傳解析器
首先要配置項目的框架，也就是倒導入"struts2-core-2.2.1.jar"庫文件，找到org.apache.struts2包下的default.porperties資源文件。如下圖；資源文件中給出了不同的strus2的默認配置，我們可看到struts2默認是jakarta作為其文件上傳的解析器。
?jakarta是Commo-FileUpload的框架。如果要使用Commo-FileUpload框架來上傳文件，只需將"commons-fileupload-1.2.1.jar"和"commons-io-1.3.2.jar"兩個jar復制到項目中的WEB-INF/lib目錄下就可。
如果想要使用COS框架來上傳文件，只需將“cos.jar”復制到項目中就可以，然后在修改struts.multipart.parser常量值。
修改常量值有兩種方法，一是在"struts.xml"中修改，代碼如下：
<constant name="struts.multipart.paeser" value="cos"></constant>
二是在struts.properties中修改,代碼如下：
? sruts.multipart.parser=cos
?
二、實現文件上傳的Action
? 創建表單:upload.jsp
?? ? ? <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
Jsp代碼 ?? 完成上傳Action
package net.hncu.struts2.action;
Java代碼 ?? 配置上傳Action
?? <?xml version="1.0" encoding="UTF-8" ?>
Java代碼 ?? 測試頁面：
?
?
?
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