Struts2本身並沒提供上傳的組件,我們可以通過調用上傳框架來實現文件的上傳。
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作爲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複製到項目中的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”複製到項目中就可以,然後在修改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
- <%
- 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>
完成上傳Action
package net.hncu.struts2.action;
JAVA代碼
- 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 {
- //基於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;
- }
- }
配置上傳Action
<?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>
- <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>