實現步驟：
二、單個文件上傳上傳頁面
<%@ 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>單個文件上傳</title></head><body><form action="doUpload.action" method="post" enctype="mult上傳成功頁面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglibUploadAction
package com.pb.web.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.apache.commons.io.IOUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport { //上傳文件全路徑、類型、文件名 private File upload; private String uploadContentType; private String uploadFileName; //新文件保存路徑和名稱 private String savePah; public String doUpload() throws IOException{ System.out.println(upload); System.out.println(uploadContentType); System.out.println(uploadFileName); String newFileName=System.currentTimeMillis()+uploadFileName.substring(uploadFileName.lastIndexOf(".")); System.out.println("新的文件名:"+newFileName); //獲取上傳路徑 savePah=ServletActionContext.getServletContext().getRealPath("/upload/"+newFileName); System.out.println("上傳保存的路徑和名稱:"+savePah); //使用文件輸入、輸出流寫入文件 FileInputStream fis=new FileInputStream(upload); FileOutputStream fos=new FileOutputStream(savePah); //設置緩沖區大小 /*byte[] bytes=new byte[1024]; //讀取文件 int length=fis.read(bytes); while(length>0){ //寫入文件 fos.write(bytes); length=fis.read(bytes); }*/ //復制文件 IOUtils.copy(fis, fos); fos.flush(); fos.close(); fis.close(); return SUCCESS; } public File getUpload() { return upload; } public void setUpload(File upload) { this.upload = upload; } public String getUploadContentType() { return uploadContentType; } public void setUploadContentType(String uploadContentType) { this.uploadContentType = uploadContentType; } public String getUploadFileName() { return uploadFileName; } public void setUploadFileName(String uploadFileName) { this.uploadFileName = uploadFileName; } public String getSavePah() { return savePah; } public void setSavePah(String savePah) { this.savePah = savePah; } }struts.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <package name="default" namespace="/" extends="struts-default"> <action name="doUpload" class="com.pb.web.action.UploadAction" method="doUpload"> <result name="success"> /singleUploadSuccess.jsp </result> <result name="error"> /error.jsp </result> <result name="input"> /singleUpload.jsp </result> </action> </package></struts>三、限制文件大小
- 在struts.xml中配置常量
<constant name="struts.multipart.maxSize" value="5000000"/>5M大小在action下配置攔截器
<interceptor-ref name="fileUpload"> <param name="maximumSize">5000000</param> </interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref>五、限制文件類型
<interceptor-ref name="fileUpload"> <param name="allowedTypes">image/pjpeg,image/jpeg,image/gif,image/png</param> <param name="maximumSize">5000000</param> </interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref>
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <constant name="struts.multipart.maxSize" value="1000000" /> <constant name="struts.multipart.saveDir" value="/tmp"/> <package name="default" namespace="/" extends="struts-default"> <action name="doupload" class="com.pb.web.action.UploadAction" method="upload"> <interceptor-ref name="fileUpload"> <param name="maximumSize">40000</param> <param name="allowedTypes">image/jpeg,image/pjpeg,image/gif,image/png</param> </interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref> <result name="success"> /oneUploadSuccess.jsp </result> <result name="input"> /error.jsp </result> </action> </package></struts>六、多個文件上傳和單個文件上傳一個只是接收參數變為數組
mulUpload.jsp
<%@ 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>多個 文件上傳</title><script type="text/Javascript" src="js/jquery-1.11.2.min.js"></script><script type="text/javascript">function addFile(){ /* 獲取父元素*/ var parent=$("#add").parent(); /*創建新的節點 */ var file=$("<input type='file' name='upload' /><br/>"); /* 添中節點 */ parent.append(file); }</script></head><body><form action="doupload.action" method="post" enctype="multipart/form-data"><input type="file" name="upload" /><input type="button" value="繼續添加" onclick="addFile();" id="add"/><input type="submit" value="上傳" /><br/></form></body></html>error.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!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>上傳失敗</title></head><body>上傳失敗<a href="mulUpload.jsp">返回</a><s:debug/></body></html>mulUploadSuccess.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!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>上傳成功</title></head><body><!--顯示上傳的圖片 --><s:iterator value="savePath" var="i"><img alt="圖片" src="<s:property value='#i'/>"></s:iterator><s:debug/></body></html>UploadAction.java
package com.pb.web.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.apache.commons.io.IOUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport { // 文件上傳路徑、類型、名稱 private List<File> upload; private List<String> uploadFileName; private List<String> uploadContentType; // 新的文件名稱 private List<String> savePath=new ArrayList<String>(); public String upload() throws IOException { for (int i = 0; i < upload.size(); i++) { //重命名 用長時間+原來的文件名 String newFileName = System.currentTimeMillis()+""+uploadFileName.get(i); System.out.println("新的文件名:"+newFileName); //獲取上傳路徑 //將新的路徑和名稱添加入集合 savePath.add(ServletActionContext.getServletContext().getRealPath("/upload/"+newFileName)); System.out.println(savePath.get(i)); //讀取文件 FileInputStream fis=new FileInputStream(upload.get(i)); //寫入文件 FileOutputStream fos=new FileOutputStream(savePath.get(i)); //將文件從輸入流，復制到輸出流中 IOUtils.copy(fis, fos); //強制刷新輸出流，清空緩沖區 fos.flush(); fos.close(); fis.close(); } return SUCCESS; } public List<File> getUpload() { return upload; } public void setUpload(List<File> upload) { this.upload = upload; } 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 List<String> getSavePath() { return savePath; } public void setSavePath(List<String> savePath) { this.savePath = savePath; }}struts.xml
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <!--設置文件大小攔截器 --> <constant name="struts.multipart.maxSize" value="10000000"></constant> <constant name="struts.multipart.saveDir" value="/tmp"/> <package name="default" namespace="/" extends="struts-default"> <action name="doupload" class="com.pb.web.action.UploadAction" method="upload"> <interceptor-ref name="fileUpload"> <!--設置文件類型攔截器 --> <param name="allowedTypes">image/jpeg,image/pjpeg,image/png</param> <!--設置文件大小攔截器 --> <param name="maximumSize">5000000</param> </interceptor-ref> <!-- struts默認的攔截器 --> <interceptor-ref name="defaultStack" /> <result name="success"> /mulUploadSuccess.jsp </result> <result name="input"> /error.jsp </result> </action> </package></struts>更詳細的請參考：struts下載包中的幫助文檔：
file://stuts2/struts2-2.3.4.1-all/struts-2.3.4.1/docs/WW/file-upload.html
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