Struct2文件上传
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
1.jsp—uploadfile.jsp文件。
注意：form标签要使用Structs2的标签，如果使用HTML的form标签，则可能会出错，显示找不到action，原因不明。
（例如欢迎页面是index.jsp，从index跳转到uploadfile.jsp后再用HTML的form标签就会找不到对应的action）
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>单文件上传</title> </head> <body> <s:form action="uploadfile1" method="post" namespace="/SingleUpload" enctype="multipart/form-data"> <s:file name="upf" /> <s:submit value="方式1提交"/> </s:form> <br/> <s:form action="uploadfile2" method="post" namespace="/SingleUpload" enctype="multipart/form-data"> <s:file name="upf" /> <s:submit value="方式2提交" /> </s:form> </body> </html>
2.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" /> <!-- 文件上传action --> <package name="SingleUpload" extends="struts-default" namespace="/SingleUpload"> <!-- 单文件上传，方法1 --> <action name="uploadfile1" class="com.oschina.upload.SingleUploadAction" method="execute1" > <!-- <param name="savePath">D:/FileUpLoad</param> --> <result name="success">/success.jsp</result> <result name="error">/error.jsp</result> </action> <!-- 单文件上传，方法2 --> <action name="uploadfile2" class="com.oschina.upload.SingleUploadAction" method="execute2"> <param name="savePath">D:/FileUpLoad</param> <result name="success">/success.jsp</result> <result name="error">/error.jsp</result> <!-- 配置过滤器 --> <interceptor-ref name="fileUpload"> <!-- <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param> --><!-- 文件过滤 --> <param name="maximumSize">1025956</param><!-- 文件大小, 以字节为单位 --> </interceptor-ref> <interceptor-ref name="defaultStack" /> <!-- 默认拦截器必须放在fileUpload之后，否则无效 --> </action> </package> </struts>
3、Action—SingleUploadAction.java
package com.oschina.upload;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class SingleUploadAction extends ActionSupport{
private File upf; //上传的文件
private String upfFileName; //文件名称
private String upfContentType; //文件类型
private String savePath; //设置的文件保存路径
//第一种方式,使用FileUtils工具类复制文件。
public String execute1() {
System.out.print("come into excute1");
System.out.print("F://");
if (upf != null) {
File savefile = new File("d://FileUpLoad", upfFileName);
if (!savefile.getParentFile().exists()){
savefile.mkdirs();
}
try {
FileUtils.copyFile(upf, savefile);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ActionContext.getContext().put("upf-message", "使用方法1成功上传文件："+upfFileName);
return "success";
}
return "error";
}
//第二种方式，使用文件流读写存储
public String execute2() {
System.out.print("come into excute2");
System.out.println("文件的存储路径为："+savePath);
FileOutputStream fos = null;
FileInputStream fis = null;
Boolean result = true;
try {
// 建立文件上传流
fis = new FileInputStream(upf);
// 建立文件输出流
fos = new FileOutputStream(getSavePath() + "\\" + upfFileName);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
ActionContext.getContext().put("upf-message", "使用方法2成功上传文件："+upfFileName);
} catch (Exception e) {
result = false;
System.out.println("文件上传失败");
e.printStackTrace();
} finally {
close(fos, fis);
}
if (result) {
return SUCCESS;
}else {
return "error";
}
}
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();
}
}
}
public File getUpf() {
return upf;
}
public void setUpf(File upf) {
this.upf = upf;
}
public String getUpfFileName() {
return upfFileName;
}
public void setUpfFileName(String upfFileName) {
this.upfFileName = upfFileName;
}
public String getUpfContentType() {
return upfContentType;
}
public void setUpfContentType(String upfContentType) {
this.upfContentType = upfContentType;
}
public String getSavePath() {
return savePath;
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
4显示结果页面—success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <html> <head> <base href="<%=basePath%>"> <title>请求成功</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <s:property value="upf-message" /> </body> </html>