struts2初学之form上传
以前struts1使用的FormFile我不是很喜欢，这下好了，struts2现在直接拿到File了，OK，上代码！
需要上传的话要用到2个jar包：commons-io-x.jar和commons-fileupload-x.jar导入到lib后即可。
PS：我的工程名字叫TestStruts
1.写action:(BaseAction.java见第一章节)
FormFileStruts2.java:
package com.xuyi.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class FormFileStruts2 extends BaseAction {
public static final String ROOT = "upload\\";
private String username;
//可以拿到file的流,使用tmp文件
private File image;
//固定格式取file的真实文件名
private String imageFileName;
//固定格式
private String imageContentType;
private String msg;
@Override
public String execute() throws Exception {
//配置src下面的struts.properties中加入struts.multipart.saveDir = /tmp
//否则在上传文件时会出现Unable to find 'struts.multipart.saveDir' property setting的错误
String rootPath = getSession().getServletContext().getRealPath("/");
rootPath += ROOT;
mkDirectory(rootPath);
System.out.println(rootPath);
try {
upload(imageFileName, rootPath, image);
} catch (RuntimeException e) {
e.printStackTrace();
}
msg = imageFileName;
return SUCCESS;
}
/**
* 根据路径创建一系列的目录
*
* @param path
*/
boolean mkDirectory(String path) {
File file = null;
try {
file = new File(path);
if (!file.exists()) {
return file.mkdirs();
}
} catch (RuntimeException e) {
e.printStackTrace();
} finally {
file = null;
}
return false;
}
/**
* 上传文件
*
* @param savePath
* 文件的保存路径
* @param uploadFile
* 被上传的文件
* @return uploadFileName
*/
String upload(String uploadFileName, String savePath, File uploadFile) {
FileOutputStream fos = null;
FileInputStream fis = null;
try {
fos = new FileOutputStream(savePath + uploadFileName);
fis = new FileInputStream(uploadFile);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
fos.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return uploadFileName;
}
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;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getMsg() {
return msg;
}
}
src下面新建一个struts.properties文件:
struts.multipart.saveDir = /tmp
2.配置struts.xml
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <!--package: name可以随便指定 namespace指定页面的目录（/为根目录） extends指定为 struts-default.xml文件（此文件包含默认的设置和定义） --> <package name="struts" namespace="/" extends="struts-default"> <!--action:name是访问action的名称 class是action的类 method是访问的action里的方法等同于struts1的method result是返回url--> <!-- struts2 file_upload begin --> <action name="formFileStruts2" class="com.xuyi.action.FormFileStruts2"> <result name="success">/pages/struts2_form_file_result.jsp</result> </action> <!-- struts2 file_upload end --> </package> </struts>
3.在WebRoot下建立pages文件夹中创建jsp
struts2_form_file_submit.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> <title>Struts2-form上传示例-提交页</title> </head> <body> <form action="../formFileStruts2.action" method="post" enctype="multipart/form-data"> 用户名：<input type="text" name="username"><br/><br/> 图片：<input type="file" name="image"><br/><br/> <input type="submit" value="提交"> </form> </body> </html>
struts2_form_file_result.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>
<title>Struts2-form上传示例-结果页</title>
</head>
<body>
${username}上传图片${msg}成功!
</body>
</html>
4.访问：http://localhost:8080/TestStruts/pages/struts2_form_file_submit.jsp即可操作