struts2 一個上傳文件的簡單配置

一、配置web.xml.   

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" 

xmlns="http://java.sun.com/xml/ns/javaee" 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <welcome-file-list>

    <welcome-file>/index.jsp</welcome-file>

  </welcome-file-list>

  <filter>

  <filter-name>struts2</filter-name>

  <filter-class>

  org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

  </filter-class>

  </filter>

  <filter-mapping>

  <filter-name>struts2</filter-name>

  <url-pattern>/*</url-pattern>

  </filter-mapping>

</web-app>

二、配置struts2.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

<constant name="struts.custom.i18n.resources" value="globalMessages"/>

<constant name="struts.i18n.encoding" value="utf-8"/>

<!-- 服務器指定一個臨時的路徑  不然會上傳失敗 -->

<constant name="struts.multipart.saveDir" value="D:/test"/>

<constant name="struts.multipart.maxSize" value="30000000"></constant>

<package name="lee" extends="struts-default" namespace="/p">

<action name="file" class="com.cn.action.FileUpload" method="upload">

<interceptor-ref name="fileUpload">

<!--<param name="allowedTypes">application/zip,application/octet-stream</param>-->

<param name="maximumSize">524288000</param>

</interceptor-ref>

<interceptor-ref name="defaultStack"/>

<!-- 保存路徑爲當前項目WebRoot/upload -->

<param name="savePath" >/upload</param>

<result name="success">index.jsp</result>

</action>

</package>

</struts>    

三、fileUpload  爲action類

package com.cn.action;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.PrintWriter;

import java.text.DecimalFormat;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileUpload extends ActionSupport {

private String savePath;

/**這裏的名字和html的名字必須對稱*/

private File img;

/**要上傳的文件類型*/

private String imgContentType;                                       

/**文件的名稱*/

private String imgFileName;

/**

* 指定的上傳類型   zip 和   圖片格式的文件

*/

private static final String[] types = { "application/x-zip-compressed",

"ZIP", "image/pjpeg","image/x-png" };  //"application/octet-stream; charset=utf-8",

/***

* 判斷文件的類型是否爲指定的文件類型

* @return

*/

public boolean filterType() {

boolean isFileType = false;

String fileType = getImgContentType();

System.out.println(fileType);

for (String type : types) {

if (type.equals(fileType)) {

isFileType = true;

break;

}

}

return true;

}

public String getSavePath() {

String realPath = ServletActionContext.getRequest().getRealPath(savePath);

System.out.println("savePaht -- " + realPath);

return realPath;

}

public File getImg() {

return img;

}

public String getImgFileName() {

return imgFileName;

}

public void setSavePath(String value) {

this.savePath = value;

}

public void setImgFileName(String imgFileName) {

this.imgFileName = imgFileName;

}

public void setImg(File img) {

this.img = img;

}

public String getImgContentType() {

return imgContentType;

}

public void setImgContentType(String imgContentType) {

this.imgContentType = imgContentType;

}

/**

* 取得文件夾大小

* 

* @param f

* @return

* @throws  Exception

*/

public long getFileSize(File f) throws Exception {

return f.length();

}

public String FormetFileSize(long fileS) {// 轉換文件大小

DecimalFormat df = new DecimalFormat("#.00");

String fileSizeString = "";

if (fileS < 1024) {

fileSizeString = df.format((double) fileS) + "B";

} else if (fileS < 1048576) {

fileSizeString = df.format((double) fileS / 1024) + "K";

} else if (fileS < 1073741824) {

fileSizeString = df.format((double) fileS / 1048576) + "M";

} else {

fileSizeString = df.format((double) fileS / 1073741824) + "G";

}

return fileSizeString;

}

/**

* 上傳文件操做

* 

* @return

* @throws  Exception

*/

public String upload() throws Exception {

String ct  =  ServletActionContext.getRequest().getHeader("Content-Type");

System.out.println("Content-Type="+ct);

String result = "unknow error";

System.out.println("orderId="+getOrderId());

PrintWriter out = ServletActionContext.getResponse().getWriter();

if (!filterType()) {

System.out.println("文件類型不正確");

ServletActionContext.getRequest().setAttribute("typeError",

"您要上傳的文件類型不正確");

result = "error:" + getImgContentType() + " type not upload file type";

} else {

System.out.println("當前文件大小爲："

+ FormetFileSize(getFileSize(getImg())));

FileOutputStream fos = null;

FileInputStream fis = null;

try {

// 保存文件那一個路徑

fos = new FileOutputStream(getSavePath() + "\\"

+ getImgFileName());

fis = new FileInputStream(getImg());

byte[] buffer = new byte[1024];

int len = 0;

while ((len = fis.read(buffer)) > 0) {

fos.write(buffer, 0, len);

}

//result = "上傳成功!";

result = "Upload File Success !";

} catch (Exception e) {

result = "Upload File Failed ! ";

e.printStackTrace();

} finally {

fos.close();

fis.close();

}

}

out.print(result);

return null;

}

}

四、jsp頁面

<form action="p/file!upload" method="post" enctype="multipart/form-data">

選擇文件：

<input type="file" name="img" />

<br>

<input type="submit" value="上傳" />

</form>