struts文件上傳java_在Java中文件上傳時怎樣判斷並限制附件大小

❶ 用java的三大框架實現文件的上傳下載，求代碼啊，最好是分為action,service,serv

package cn.itcast.struts2.demo1;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**
* 完成文件上傳（不是解析上傳內容，因為上傳內容由fileUpload攔截器負責解析）
*
* @author seawind
*
*/
public class UploadAction extends ActionSupport {
// 接收上傳內容
// <input type="file" name="upload" />
private File upload; // 這里變數名和頁面表單元素 name 屬性一致
private String uploadContentType;
private String uploadFileName;

public void setUpload(File upload) {
this.upload = upload;
}

public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}

public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}

@Override
public String execute() throws Exception {
if (upload == null) { // 通過xml配置 required校驗器完成校驗
// 沒有上傳文件
return NONE;
}
// 將上傳文件保存到伺服器端
// 源文件 upload
// 目標文件
File destFile = new File(ServletActionContext.getServletContext()
.getRealPath("/upload") + "/" + uploadFileName);
// 文件復制使用commons-io包提供工具類
FileUtils.File(upload, destFile);
return NONE;
}
}
多文件上傳
package cn.itcast.struts2.demo1;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**
* 支持多文件上傳
*
* @author seawind
*
*/
public class MultiUploadAction extends ActionSupport {
// 接收多文件上傳參數，提供數組接收就可以了
private File[] upload;
private String[] uploadContentType;
private String[] uploadFileName;

public void setUpload(File[] upload) {
this.upload = upload;
}

public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}

public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName;
}

@Override
public String execute() throws Exception {
for (int i = 0; i < upload.length; i++) {
// 循環完成上傳
File srcFile = upload[i];
String filename = uploadFileName[i];

// 定義目標文件
File destFile = new File(ServletActionContext.getServletContext()
.getRealPath("/upload" + "/" + filename));
FileUtils.File(srcFile, destFile);
}
return NONE;
}
}

❷ 在Java中，文件上傳時怎樣判斷並限制附件大小

你是用什麼方式上傳的？如果是JQUERY 'onSelect': function(e, queueId, fileObj) 在這里
判斷多大fileObj.size 超過就提示並return false 就可以了如果是普通上傳可以讀到文件路徑一樣用 File file = new File(path); file .size 判斷如果超過就不給上傳並提示到頁面就可以了
struts上傳還可以在配置文件裡面做限制 struts.properties 裡面加上這個
struts.multipart.maxSize=2097152

❸ javaee 用struts2的文件上傳，保存才伺服器目錄下伺服器是tomcat 為什麼電腦重啟後文件就沒有了

首先，

文件上傳到伺服器是保存在磁碟上的，磁碟是永久性存儲介質，如果不是手動刪除或者中毒(這種可能性不大)，是不會丟失的。你可能是上次運行的時候上傳的文件在伺服器中，後來被你重新發布項目把原項目直接覆蓋掉了，因為你原項目中可能沒有存你新發布的圖片，所以直接丟失掉了，建議如果有重要的上傳文件，先將已經上傳的文件備份一下，再發布新的項目。或者是你發布新文件的時候設置一下那個發布選項，只覆蓋舊文件，不要全部刪除後上傳新項目，如圖

❹ java中怎麼利用struts2上傳多個pdf文件

通過3種方式模擬多個文件上傳
第一種方式
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; //文件名稱
private String[] imageContentType; //文件類型
public String execute() throws Exception {
ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
String realpath = ServletActionContext.getServletContext().getRealPath("/images");
System.out.println(realpath);
if (image != null) {
File savedir=new File(realpath);
if(!savedir.getParentFile().exists())
savedir.getParentFile().mkdirs();
for(int i=0;i<image.length;i++){
File savefile = new File(savedir, imageFileName[i]);
FileUtils.File(image[i], savefile);
}
ActionContext.getContext().put("message", "文件上傳成功");
}
return "success";
}
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;
}
}
第二種方式
package com.ljq.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* 使用數組上傳多個文件
*
* @author ljq
*
*/
@SuppressWarnings("serial")
public class UploadAction2 extends ActionSupport{
private File[] image; //上傳的文件
private String[] imageFileName; //文件名稱
private String[] imageContentType; //文件類型
private String savePath;
@Override
public String execute() throws Exception {
ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
//取得需要上傳的文件數組
File[] files = getImage();
if (files !=null && files.length > 0) {
for (int i = 0; i < files.length; i++) {
//建立上傳文件的輸出流, getImageFileName()[i]
System.out.println(getSavePath() + "\\" + getImageFileName()[i]);
FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName()[i]);
//建立上傳文件的輸入流
FileInputStream fis = new FileInputStream(files[i]);
byte[] buffer = new byte[1024];
int len = 0;
while ((len=fis.read(buffer))>0) {
fos.write(buffer, 0, len);
}
fos.close();
fis.close();
}
}
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;
}
/**
* 返回上傳文件保存的位置
*
* @return
* @throws Exception
*/
public String getSavePath() throws Exception {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
第三種方式
package com.ljq.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* 使用List上傳多個文件
*
* @author ljq
*
*/
@SuppressWarnings("serial")
public class UploadAction3 extends ActionSupport {
private List<File> image; // 上傳的文件
private List<String> imageFileName; // 文件名稱
private List<String> imageContentType; // 文件類型
private String savePath;
@Override
public String execute() throws Exception {
ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
// 取得需要上傳的文件數組
List<File> files = getImage();
if (files != null && files.size() > 0) {
for (int i = 0; i < files.size(); i++) {
FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName().get(i));
FileInputStream fis = new FileInputStream(files.get(i));
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fis.close();
fos.close();
}
}
return SUCCESS;
}
public List<File> getImage() {
return image;
}
public void setImage(List<File> image) {
this.image = image;
}
public List<String> getImageFileName() {
return imageFileName;
}
public void setImageFileName(List<String> imageFileName) {
this.imageFileName = imageFileName;
}
public List<String> getImageContentType() {
return imageContentType;
}
public void setImageContentType(List<String> imageContentType) {
this.imageContentType = imageContentType;
}
/**
* 返回上傳文件保存的位置
*
* @return
* @throws Exception
*/
public String getSavePath() throws Exception {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
struts.xml配置文件
<?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>

<constant name="struts.action.extension" value="do" />

<constant name="struts.serve.static.browserCache" value="false" />

<constant name="struts.configuration.xml.reload" value="true" />

<constant name="struts.devMode" value="true" />

<constant name="struts.ui.theme" value="simple" />


<constant name="struts.i18n.encoding" value="UTF-8" />
<constant name="struts.multipart.maxSize" value="10701096"/>
<package name="upload" namespace="/upload" extends="struts-default">
<action name="*_upload" class="com.ljq.action.UploadAction" method="{1}">
<result name="success">/WEB-INF/page/message.jsp</result>
</action>
</package>
<package name="upload1" namespace="/upload1" extends="struts-default">
<action name="upload1" class="com.ljq.action.UploadAction2" method="execute">

<param name="savePath">/image</param>
<result name="success">/WEB-INF/page/message.jsp</result>
</action>
</package>
<package name="upload2" namespace="/upload2" extends="struts-default">
<action name="upload2" class="com.ljq.action.UploadAction3" method="execute">

<param name="savePath">/image</param>
<result name="success">/WEB-INF/page/message.jsp</result>
</action>
</package>
</struts>
上傳表單頁面upload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>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">
</head>
<body>




<form action="${pageContext.request.contextPath}/upload2/upload2.do" enctype="multipart/form-data" method="post">
文件1:<input type="file" name="image"><br/>
文件2:<input type="file" name="image"><br/>
文件3:<input type="file" name="image"><br/>
<input type="submit" value="上傳" />
</form>
</body>
</html>
顯示頁面message.jsp
<%@ 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>My JSP 'message.jsp' starting page</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/>
<s:debug></s:debug>
</body>
</html>

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