Struts2实现图片上传功能 （单个图片文件）

开发步骤如下：1、新建一个web工程，导入struts2上传文件所需jar，如下图

目录结构

2、新建Action 第一种方式

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; //上传的文件
private String imageFileName; //文件名称
private String imageContentType; //文件类型

public String execute() throws Exception {
String realpath = ServletActionContext.getServletContext().getRealPath("/images");
//D:\apache-tomcat-6.0.18\webapps\struts2_upload\images
System.out.println("realpath: "+realpath);
if (image != null) {
File savefile = new File(new File(realpath), imageFileName);
if (!savefile.getParentFile().exists())
savefile.getParentFile().mkdirs();
FileUtils.copyFile(image, savefile);
ActionContext.getContext().put("message", "文件上传成功");
}
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;
}

}

第二种方式

package com.ljq.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class UploadAction2 extends ActionSupport {

// 封装上传文件域的属性
private File image;
// 封装上传文件类型的属性
private String imageContentType;
// 封装上传文件名的属性
private String imageFileName;
// 接受依赖注入的属性
private String savePath;

@Override
public String execute() {
FileOutputStream fos = null;
FileInputStream fis = null;
try {
// 建立文件输出流
System.out.println(getSavePath());
fos = new FileOutputStream(getSavePath() + "\\" + getImageFileName());
// 建立文件上传流
fis = new FileInputStream(getImage());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
} catch (Exception e) {
System.out.println("文件上传失败");
e.printStackTrace();
} finally {
close(fos, fis);
}
return SUCCESS;
}

/**
* 返回上传文件的保存位置
*
* @return
*/
public String getSavePath() throws Exception{
return ServletActionContext.getServletContext().getRealPath(savePath);
}

public void setSavePath(String savePath) {
this.savePath = savePath;
}

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;
}

private void close(FileOutputStream fos, FileInputStream fis) {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
System.out.println("FileInputStream关闭失败");
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
System.out.println("FileOutputStream关闭失败");
e.printStackTrace();
}
}
}

}

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>
<!-- 该属性指定需要Struts2处理的请求后缀，该属性的默认值是action，即所有匹配*.action的请求都由Struts2处理。
如果用户需要指定多个请求后缀，则多个后缀之间以英文逗号（,）隔开。 -->
<constant name="struts.action.extension" value="do" />
<!-- 设置浏览器是否缓存静态内容,默认值为true(生产环境下使用),开发阶段最好关闭 -->
<constant name="struts.serve.static.browserCache" value="false" />
<!-- 当struts的配置文件修改后,系统是否自动重新加载该文件,默认值为false(生产环境下使用),开发阶段最好打开 -->
<constant name="struts.configuration.xml.reload" value="true" />
<!-- 开发模式下使用,这样可以打印出更详细的错误信息 -->
<constant name="struts.devMode" value="true" />
<!-- 默认的视图主题 -->
<constant name="struts.ui.theme" value="simple" />
<!--<constant name="struts.objectFactory" value="spring" />-->
<!--解决乱码 -->
<constant name="struts.i18n.encoding" value="UTF-8" />
<!-- 指定允许上传的文件最大字节数。默认值是2097152(2M) -->
<constant name="struts.multipart.maxSize" value="10701096"/>
<!-- 设置上传文件的临时文件夹,默认使用javax.servlet.context.tempdir -->
<constant name="struts.multipart.saveDir " value="d:/tmp" />

<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="upload2" extends="struts-default">
<action name="upload2" class="com.ljq.action.UploadAction2" method="execute">
<!-- 动态设置savePath的属性值 -->
<param name="savePath">/images</param>
<result name="success">/WEB-INF/page/message.jsp</result>
<result name="input">/upload/upload.jsp</result>
<interceptor-ref name="fileUpload">
<!-- 文件过滤 -->
<param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
<!-- 文件大小, 以字节为单位 -->
<param name="maximumSize">1025956</param>
</interceptor-ref>
<!-- 默认拦截器必须放在fileUpload之后，否则无效 -->
<interceptor-ref name="defaultStack" />
</action>
</package>
</struts>

上传表单页面

<%@ 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>文件上传</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>

<body>
<!-- ${pageContext.request.contextPath}/upload/execute_upload.do -->
<!-- ${pageContext.request.contextPath}/upload2/upload2.do -->
<form action="${pageContext.request.contextPath}/upload2/upload2.do"
enctype="multipart/form-data" method="post">
文件:<input type="file" name="image">
<input type="submit" value="上传" />
</form>
<br/>
<s:fielderror />
</body>
</html>

显示结果页面

<%@ 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>上传成功</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>

<body>
上传成功！
<br/><br/>
<!-- ${pageContext.request.contextPath} tomcat部署路径，
如：D:\apache-tomcat-6.0.18\webapps\struts2_upload\ -->
<img src="${pageContext.request.contextPath}/<s:property value="'images/'+imageFileName"/>">
<s:debug></s:debug>
</body>
</html>