struts2文件上传
通过2种方式模拟单个文件上传，效果如下所示
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")
publicclass UploadAction extends ActionSupport{
private File p_w_picpath; //上传的文件
private String p_w_picpathFileName; //文件名称
private String p_w_picpathContentType; //文件类型
public String execute() throws Exception {
String realpath = ServletActionContext.getServletContext().getRealPath("/p_w_picpaths");
//D:\apache-tomcat-6.0.18\webapps\struts2_upload\p_w_picpaths
System.out.println("realpath: "+realpath);
if (p_w_picpath !=null) {
File savefile =new File(new File(realpath), p_w_picpathFileName);
if (!savefile.getParentFile().exists())
savefile.getParentFile().mkdirs();
FileUtils.copyFile(p_w_picpath, savefile);
ActionContext.getContext().put("message", "文件上传成功");
}
return"success";
}
public File getImage() {
return p_w_picpath;
}
publicvoid setImage(File p_w_picpath) {
this.p_w_picpath = p_w_picpath;
}
public String getImageFileName() {
return p_w_picpathFileName;
}
publicvoid setImageFileName(String p_w_picpathFileName) {
this.p_w_picpathFileName = p_w_picpathFileName;
}
public String getImageContentType() {
return p_w_picpathContentType;
}
publicvoid setImageContentType(String p_w_picpathContentType) {
this.p_w_picpathContentType = p_w_picpathContentType;
}
}
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")
publicclass UploadAction2 extends ActionSupport {
// 封装上传文件域的属性
private File p_w_picpath;
// 封装上传文件类型的属性
private String p_w_picpathContentType;
// 封装上传文件名的属性
private String p_w_picpathFileName;
// 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 =newbyte[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);
}
publicvoid setSavePath(String savePath) {
this.savePath = savePath;
}
public File getImage() {
return p_w_picpath;
}
publicvoid setImage(File p_w_picpath) {
this.p_w_picpath = p_w_picpath;
}
public String getImageContentType() {
return p_w_picpathContentType;
}
publicvoid setImageContentType(String p_w_picpathContentType) {
this.p_w_picpathContentType = p_w_picpathContentType;
}
public String getImageFileName() {
return p_w_picpathFileName;
}
publicvoid setImageFileName(String p_w_picpathFileName) {
this.p_w_picpathFileName = p_w_picpathFileName;
}
privatevoid 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">/p_w_picpaths</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">p_w_picpath/bmp,p_w_picpath/png,p_w_picpath/gif,p_w_picpath/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="p_w_picpath">
<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="'p_w_picpaths/'+p_w_picpathFileName"/>">
<s:debug></s:debug>
</body>
</html>