struts2的文件上传

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1.创建upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>    <title>Struts 2文件上传</title><link rel="stylesheet" type="text/css" href="Style.css"></head>  <body><center><div><%@ include file="top.html" %></div><h3>Struts 2文件上传</h3><hr/><s:form action="myUpload" enctype="multipart/form-data"><s:file name="doc" label="选择上传文件"/><s:submit value="上传"/></s:form></center></body></html>

MyUpload.java

package action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class MyUpload extends ActionSupport{/** *  */private static final long serialVersionUID = 417923359216619076L;// 封装上传文件域的属性private File doc;// 封装上传文件的类型private String docContentType;// 封装上传文件名private String docFileName;private String path; //接受依赖注入的属性@SuppressWarnings("deprecation")public String getPath() { //返回上传文件的保存位置return ServletActionContext.getRequest().getRealPath(path);}public void setPath(String path) { this.path = path;}public File getDoc() {return doc;}public void setDoc(File doc) {this.doc = doc;}public String getDocContentType() {return docContentType;}public void setDocContentType(String docContentType) {this.docContentType = docContentType;}public String getDocFileName() {return docFileName;}public void setDocFileName(String docFileName) {this.docFileName = docFileName;}@SuppressWarnings("resource")@Overridepublic String execute() throws Exception {docFileName = getFileName(docFileName);FileOutputStream fos = new FileOutputStream(getPath() + "\\" + docFileName);FileInputStream fis = new FileInputStream(doc);byte[] b = new byte[1024];int length = 0;while((length = fis.read(b)) > 0) { //强文件上传的内容保存到服务器端fos.write(b, 0, length);  }return SUCCESS;}private String getFileName(String fileName) {int position = fileName.lastIndexOf(".");String extension = fileName.substring(position);return System.currentTimeMillis() + extension;}}

上述的3个属性名称不能随意，如果file的标签不是doc,而是abc，那么Action累中封装的属性是abc,abccontextType和abcFileName.

配置struts,xml

<!DOCTYPE struts PUBLIC        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"        "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <constant name="struts.i18n.encoding" value="utf-8" />    <constant name="struts.custom.i18n.resources" value="globalMessages" />    <package name="default" extends="struts-default">        <action name="myUpload" class="action.MyUpload">            <!-- 上传文件拦截，只能上传图片资源 -->            <interceptor-ref name="fileUpload">                <!--allowedTypes允许上传的文件类型 -->                <param name="allowedTypes">                    image/x-png,image/gif,image/bmp,image/pjpeg                </param>                <!-- 上传文件的大小单位 字节 -->                <param name="maximumSize">30000</param>            </interceptor-ref>            <interceptor-ref name="defaultStack"></interceptor-ref>            <param name="path">/upload</param>            <result name="success">/uploadSuccess.jsp</result>            <result name="input">/upload.jsp</result>        </action>    </package></struts>

建立uploadSuccess.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>    <title>文件上传成功</title><link rel="stylesheet" type="text/css" href="Style.css"></head>  <body><center><div><%@ include file="top.html" %></div><h3>文件上传成功</h3><hr/><img src="upload/<s:property value="docFileName"/>"/><<br/><s:property value="docFileName"/></center></body></html>

在src目录下配置国际化显示信息

globalMessages_zh_CN.properties

struts.messages.error.content.type.not.allowed=\u6587\u4EF6\u7C7B\u578B\u6709\u8BEF\uFF01\u4E0A\u4F20\u6587\u4EF6\u5FC5\u987B\u4E3A\u56FE\u7247struts.messages.error.file.too.large=\u8BF7\u4F7F\u752830000\u5B57\u8282\u4EE5\u4E0B\u7684\u6587\u4EF6\uFF01

输入http://localhost:8080/Demo11/upload.jsp，选择一个图片。运行成功

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