透過2種方式模擬單一檔案上傳，效果如下所示
開發步驟如下：
1.新建一個web工程，導入struts2上傳檔案所需jar，如下圖
目錄結構
2、新建Action
第一種方式
複製代碼代碼如下:
package com.ljq.action;
import java.io.File;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class UploadAction extends ActionSupport{
private File image; //上傳的文件
private String imageFileName; //檔案名稱
private String imageContentType; //檔案類型
public String execute() throws Exception {
String realpath = ServletActionContext.getServletContext().getRealPath("/images");
//D:/apache-tomcat-6.0.18/webapps/struts2_upload/images
System.out.println("realpath: "+realpath);
if (image != null) {
File savefile = new File(new File(realpath), imageFileName);
if (!savefile.getParentFile().exists())
savefile.getParentFile().mkdirs();
FileUtils.copyFile(image, savefile);
ActionContext.getContext().put("message", "檔案上傳成功");
}
return "success";
}
public File getImage() {
return image;
}
public void setImage(File image) {
this.image = image;
}
public String getImageFileName() {
return imageFileName;
}
public void setImageFileName(String imageFileName) {
this.imageFileName = imageFileName;
}
public String getImageContentType() {
return imageContentType;
}
public void setImageContentType(String imageContentType) {
this.imageContentType = imageContentType;
}
}
第二種方式
複製代碼代碼如下:
package com.ljq.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class UploadAction2 extends ActionSupport {
// 封裝上傳檔案域的屬性
private File image;
// 封裝上傳檔案類型的屬性
private String imageContentType;
// 封裝上傳檔案名稱的屬性
private String imageFileName;
// 接受依賴注入的屬性
private String savePath;
@Override
public String execute() {
FileOutputStream fos = null;
FileInputStream fis = null;
try {
// 建立檔案輸出流
System.out.println(getSavePath());
fos = new FileOutputStream(getSavePath() + "//" + getImageFileName());
// 建立檔案上傳流
fis = new FileInputStream(getImage());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
} catch (Exception e) {
System.out.println("檔案上傳失敗");
e.printStackTrace();
} finally {
close(fos, fis);
}
return SUCCESS;
}
/**
* 返回上傳檔案的儲存位置
*
* @return
*/
public String getSavePath() throws Exception{
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
public File getImage() {
return image;
}
public void setImage(File image) {
this.image = image;
}
public String getImageContentType() {
return imageContentType;
}
public void setImageContentType(String imageContentType) {
this.imageContentType = imageContentType;
}
public String getImageFileName() {
return imageFileName;
}
public void setImageFileName(String imageFileName) {
this.imageFileName = imageFileName;
}
private void close(FileOutputStream fos, FileInputStream fis) {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
System.out.println("FileInputStream關閉失敗");
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
System.out.println("FileOutputStream關閉失敗");
e.printStackTrace();
}
}
}
}
struts.xml設定檔
複製代碼代碼如下:
<?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>
<!-- 此屬性指定需要Struts2處理的請求後綴，該屬性的預設值是action，即所有符合*.action的請求都由Struts2處理。
如果使用者需要指定多個請求後綴，則多個後綴之間以英文逗號（,）隔開。 -->
<constant name="struts.action.extension" value="do" />
<!-- 設定瀏覽器是否快取靜態內容,預設值為true(生產環境下使用),開發階段最好關閉-->
<constant name="struts.serve.static.browserCache" value="false" />
<!-- 當struts的設定檔修改後,系統是否自動重新載入該檔,預設值為false(生產環境下使用),開發階段最好開啟-->
<constant name="struts.configuration.xml.reload" value="true" />
<!-- 開發模式下使用,這樣可以列印出更詳細的錯誤訊息-->
<constant name="struts.devMode" value="true" />
<!-- 預設的視圖主題-->
<constant name="struts.ui.theme" value="simple" />
<!--<constant name="struts.objectFactory" value="spring" />-->
<!--解決亂碼-->
<constant name="struts.i18n.encoding" value="UTF-8" />
<!-- 指定允許上傳的檔案最大位元組數。預設值是2097152(2M) -->
<constant name="struts.multipart.maxSize" value="10701096"/>
<!-- 設定上傳檔案的暫存資料夾,預設使用javax.servlet.context.tempdir -->
<constant name="struts.multipart.saveDir " value="d:/tmp" />
<package name="upload" namespace="/upload" extends="struts-default">
<action name="*_upload" method="{1}">
<result name="success">/WEB-INF/page/message.jsp</result>
</action>
</package>
<package name="upload2" extends="struts-default">
<action name="upload2" method="execute">
<!-- 動態設定savePath的屬性值-->
<param name="savePath">/images</param>
<result name="success">/WEB-INF/page/message.jsp</result>
<result name="input">/upload/upload.jsp</result>
<interceptor-ref name="fileUpload">
<!-- 文件過濾-->
<param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
<!-- 檔案大小, 以位元組為單位-->
<param name="maximumSize">1025956</param>
</interceptor-ref>
<!-- 預設攔截器必須放在fileUpload之後，否則無效-->
<interceptor-ref name="defaultStack" />
</action>
</package>
</struts>
上傳表單頁面
複製代碼代碼如下:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>檔案上傳</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<!-- ${pageContext.request.contextPath}/upload/execute_upload.do -->
<!-- ${pageContext.request.contextPath}/upload2/upload2.do -->
<form action="${pageContext.request.contextPath}/upload2/upload2.do"
enctype="multipart/form-data" method="post">
檔案:<input type="file" name="image">
<input type="submit" value="上傳" />
</form>
<br/>
<s:fielderror />
</body>
</html>
顯示結果頁面
複製代碼代碼如下:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>上傳成功</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
上傳成功！
<br/><br/>
<!-- ${pageContext.request.contextPath} tomcat部署路徑，
如：D:/apache-tomcat-6.0.18/webapps/struts2_upload/ -->
<img src="${pageContext.request.contextPath}/<s:property value="'images/'+imageFileName"/>">
<s:debug></s:debug>
</body>
</html>