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 " )
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 >