Struts2文件上傳框架

時間 2019-11-17

原文原文鏈接

一、概述javascript

二、文件上傳html

singleUpload.jspjava

<%@ 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>Insert title here</title>
</head>
<body>
 <form action="upload/doUpload" method="post" enctype="multipart/form-data">
  <input type="file" name="upload">
  <input type="submit" value="上傳">
 </form>
</body>
</html>

struts.xmlweb

 <package name="upload" namespace="/upload" extends="struts-default">
        <action name="doUpload" class="com.ljb.web.upload.UploadAction" method="doUpload">
            <result>/singleSuccess.jsp</result>
        </action>
    </package>

UploadAction:apache

package com.ljb.web.upload;
import java.io.File;
import java.io.FileInputStream;
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 {
 private File upload;
 private String uploadContentType;
 private String uploadFileName;
 
 
 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 doUpload () throws IOException {
  System.out.println(upload);
  System.out.println(uploadContentType);
  System.out.println(uploadFileName);
  // 獲取保存文件路徑
  String savePath = ServletActionContext.getServletContext().getRealPath("/upload/" + this.uploadFileName);
  System.out.println(savePath);
  
  FileInputStream fis = new FileInputStream(upload);
  FileOutputStream fos = new FileOutputStream(savePath);
  IOUtils.copy(fis, fos);
  
  fos.flush();
  fos.close();
  fis.close();
  
  return SUCCESS;
 }
}

singleSuccess.jspapp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
 String contextPath = request.getContextPath()+"/";
%>
<!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>Insert title here</title>
</head>
<body>
 文件上傳成功!
 <img alt="" src="<%=contextPath %>upload/<s:property value='uploadFileName'/>" />
</body>
</html>

小結：jsp

三、限制文件上傳大小post

第一種方式：（在struts中配置常量限制文件上傳大小，默認2M）ui

<constant name="struts.multipart.maxSize" value="10000000"></constant>

第二種方式：設置攔截器參數this

四、上傳多個文件

樣例：

multieFileUpload.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>Insert title here</title>
 <script type="text/javascript">
  function addFile () {
   var btn = document.getElementById("btn");
   
   var newChild = document.createElement("input");
   newChild.setAttribute("type", "file");
   newChild.setAttribute("name", "upload");
   
   btn.parentNode.appendChild(newChild);
   btn.parentNode.appendChild(document.createElement("br"));
  }
 </script>
</head>
<body>
 <form action="upload/multiFile" method="post" enctype="multipart/form-data">
  <input type="file" name="upload">
  <input type="button" value="繼續添加" id="btn" onclick="addFile();">
  <input type="submit" value="上傳"><br>
 </form>
</body>
</html>

struts.xml

 <package name="upload" namespace="/upload" extends="struts-default">
        <action name="doUpload" class="com.ljb.web.upload.UploadAction" method="doUpload">
            <result>/singleSuccess.jsp</result>
            <result name="input">/error.jsp</result>
        </action>
        <action name="multiFile" class="com.ljb.web.upload.MutipleFileUploadUsingListAction" method="doUpload">
            <result>/multiSuccess.jsp</result>
        </action>
    </package>

mutipleFileUploadUsingListAction

package com.ljb.web.upload;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class MutipleFileUploadUsingListAction extends ActionSupport {
 private List<File> upload;
 private List<String> uploadContentType;
 private List<String> uploadFileName;
 
 public String doUpload () throws IOException {
  System.out.println(upload.get(0));
  
  for (int i = 0 ; i < upload.size() ; i++) {
   String savePath = ServletActionContext.getServletContext().getRealPath("/upload/" + this.uploadFileName.get(i));
   
   FileInputStream fis = new FileInputStream(upload.get(i));
   FileOutputStream fos = new FileOutputStream(savePath);
   IOUtils.copy(fis, fos);
   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> getUploadContentType() {
  return uploadContentType;
 }
 public void setUploadContentType(List<String> uploadContentType) {
  this.uploadContentType = uploadContentType;
 }
 public List<String> getUploadFileName() {
  return uploadFileName;
 }
 public void setUploadFileName(List<String> uploadFileName) {
  this.uploadFileName = uploadFileName;
 }
}