struts2实现文件的上传

如何来实现struts2 的文件上传：

如何来更改要上传的文件路径：

在web-xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<!-- 定义Struts 2的核心Filter -->

<filter>

<filter-name>struts2</filter-name>

<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter>

<!-- 让Struts 2的核心Filter拦截所有请求 -->

<filter-mapping>

<filter-name>struts2</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

Action处理类

package lee;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

private String title;

private File upload;

private String uploadContentType;

private String uploadFileName;

private String allowTypes;

// 接受依赖注入的属性

private String savePath;

// 接受依赖注入的方法

public void setSavePath(String value) {

this.savePath = value;

}

private String getSavePath() throws Exception {

return ServletActionContext.getServletContext().getRealPath(savePath);

}

public void setTitle(String title) {

this.title = title;

}

public void setUpload(File upload) {

this.upload = upload;

}

public void setUploadContentType(String uploadContentType) {

this.uploadContentType = uploadContentType;

}

public void setUploadFileName(String uploadFileName) {

this.uploadFileName = uploadFileName;

}

public String getTitle() {

return (this.title);

}

public File getUpload() {

return (this.upload);

}

public String getUploadContentType() {

return (this.uploadContentType);

}

public String getUploadFileName() {

return (this.uploadFileName);

}

/*//执行上传功能

58 private void uploadFile(int i) throws FileNotFoundException, IOException {

59 try {

60 InputStream in = new FileInputStream(file.get(i));

61 String dir = ServletActionContext.getRequest().getRealPath(UPLOADDIR);

62 File uploadFile = new File(dir, this.getFileFileName().get(i));

63 OutputStream out = new FileOutputStream(uploadFile);

64 byte[] buffer = new byte[1024 * 1024];

65 int length;

66 while ((length = in.read(buffer)) > 0) {

67 out.write(buffer, 0, length);

68 }

69

70 in.close();

71 out.close();

*/

@Override

public String execute() throws Exception {

System.out.println("开始上传单个文件---");

System.out.println(getSavePath());

System.out.println("==========" + getUploadFileName());

System.out.println("==========" + getUploadContentType());

System.out.println("==========" + getUpload());

// 判断是否允许上传

String filterResult = filterType(this.getAllowTypes().split(","));

if (filterResult != null) {

ActionContext.getContext().put("typeError","您要上传的文件类型不正确");

return filterResult;

}

// 以服务器的文件保存地址和原文件名建立上传文件输出流

FileOutputStream fos = new FileOutputStream(getSavePath() + "\\"

+ getUploadFileName());

FileInputStream fis = new FileInputStream(getUpload());

byte[] buffer = new byte[1024];

int len = 0;

while ((len = fis.read(buffer)) > 0) {

fos.write(buffer, 0, len);

}

return SUCCESS;

}

public String filterType(String[] types) {

String fileType = this.getUploadContentType();

for (String type : types) {

if (type.equals(fileType)) {

return null;

}

}

return INPUT;

}

public String getAllowTypes() {

return allowTypes;

}

public void setAllowTypes(String allowTypes) {

this.allowTypes = allowTypes;

}

}

Struts.properties 文件

struts.locale=zh_CN

struts.i18n.encoding=GBK

struts.multipart.parser=Jakarta

struts.xml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>

<include file="struts-default.xml" />

<constant name="struts.multipart.maxSize" value="20971520" />

<constant name="struts.custom.i18n.resources"

value="globalMessages" />

<constant name="struts.i18n.encoding" value="GBK" />

<package name="lee" extends="struts-default">

<action name="upload" class="lee.UploadAction">

<param name="allowTypes">

image/pjpeg,image/bmp,image/jpg,image/png,image/gif,image/jpeg

</param>

<param name="savePath">/upload</param>

<result>/success.jsp</result>

<result name="input">/index.jsp</result>

</action>

</package>

</struts>

在index.jsp中可以这样的写

<%@page language="java" pageEncoding="GBK"%>

<%@taglib prefix="s" uri="/struts-tags"%>

<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

</head>

<body>

${requestScope.typeError}

<form action="upload.action" method="post"

enctype="multipart/form-data">

<input type="text" name="title" />

<br>

<input type="file" name="upload" />

<br>

<input value="upload" type="submit" />

</form>

第二中实现方法：

<!-- 上传文件表单定义 -->

<s:form action="upload" method="post" enctype="multipart/form-data">

<tr>

<!-- 上传文件标签定义 -->

<td> 上传文件:<s:file name="file"></s:file></td>

</tr>

<tr>

<td> 再次上传文件:<s:file name="file"></s:file></td>

</tr>

<tr>

<td align="left"><s:submit name="submit" value="提交"></s:submit></td>

</tr>

</s:form>

</body>

</html>

上传成功的页面：

<%@ page language="java" pageEncoding="GBK"%>

<%@taglib prefix="s" uri="/struts-tags"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<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!success.jsp

<br>

文件标题:

<s:property value=" + title" />

<br>

文件为：

<img src="<s:property value="'upload/' + uploadFileName"/>" />

<br>

</body>

</html>