struts2中实现文件的上传
文件上傳的action，同時(shí)過(guò)濾上傳的文件格式只對(duì)滿足要求的格式支持上傳
package com.inspur.action;
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 uploadFileName;
private String uploadContentType;
private String savePath;
private String allowTypes;
public String getAllowTypes() {
return allowTypes;
}
public void setAllowTypes(String allowTypes) {
this.allowTypes = allowTypes;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getUpload() {
return upload;
}
public void setUpload(File upload) {
this.upload = upload;
}
public String getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String getSavePath() {
return ServletActionContext.getRequest().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
public String filterType(String[]types){
String fileType=this.getUploadContentType();
for(String type:types){
if(type.equals(fileType)){
return null;
}
}
return INPUT;
}
public String upload()throws Exception{
if(this.getAllowTypes()==null){
System.out.println("lzhq");
}
String filterResult=this.filterType(this.getAllowTypes().split(","));
if(filterResult!=null){
ActionContext.getContext().put("typeError", "this file you want to upload is error");
return filterResult;
}
FileOutputStream fos=new FileOutputStream(this.getSavePath()+"\\"+this.getUploadFileName());
FileInputStream fis=new FileInputStream(this.getUpload());
byte[]buffer=new byte[1024];
int len=0;
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len);
}
return SUCCESS;
}
}
在struts.xml文件中提供上傳文件保存路徑的動(dòng)態(tài)配置和允許的文件上傳格式的動(dòng)態(tài)配置
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.custom.i18n.resources" value="message"></constant>
<constant name="struts.i18n.encoding" value="gbk"></constant>
<package name="upload" extends="struts-default" namespace="/">
<action name="upload" class="com.inspur.action.UploadAction" method="upload">
<param name="allowTypes">image/bmp,image/png,image/gif,image/jpeg</param>
<param name="savePath">/upload</param>
<result name="success">/success.jsp</result>
<result name="input">/upload.jsp</result>
</action>
</package>
</struts>
上傳成功的轉(zhuǎn)向頁(yè)面：
<body>
上傳的文件標(biāo)題是：<s:property value="title"/><br/>
上傳的圖片是: <img alt="upload" src="<s:property value="'upload/'+uploadFileName"/>"/>
</body>
文件上傳頁(yè)面jsp文件：
<body>
${requestScope.typeError }
<form action="upload.action" method="post" name="uploadForm" enctype="multipart/form-data">
文件標(biāo)題：<input type="text" name="title"/><br/>
選擇文件：<input type="file" name="upload"/><br/>
<input type="submit" value="upload"/>
</form>
</body>
在web.xml配置文件中添加如下代碼：
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter>
<filter-name>struts-cleanup</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>struts-cleanup</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
其中org.apache.struts2.dispatcher.ActionContextCleanUp類與文件的上傳無(wú)關(guān)，但是在文件上傳的應(yīng)用中會(huì)出現(xiàn)無(wú)法預(yù)測(cè)的異常，添加該過(guò)濾器后異常消失。本身org.apache.struts2.dispatcher.ActionContextCleanUp類就是org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter類的輔助類，此處只是出于系統(tǒng)穩(wěn)定性的考慮，與應(yīng)用的文件上傳功能沒(méi)有直接的關(guān)系。
注意：struts2的文件上傳默認(rèn)使用的是common-fileupload和common-io文件上傳 框架，所以需要導(dǎo)入對(duì)應(yīng)的jar包，另外保存上傳文件的文件夾應(yīng)該是在webRoot目錄下，而不是在src目錄下，經(jīng)過(guò)編譯后部署到tomcat中的程序只是webRoot中的經(jīng)過(guò)編譯的class文件和所有的jsp，jar，properties，xml等文件而不會(huì)包含src文件，所以應(yīng)該將upload文件夾建在webRoot目錄下。
posted on 2013-04-16 22:37 moonfans 閱讀(...) 評(píng)論(...) 編輯 收藏轉(zhuǎn)載于:https://www.cnblogs.com/moonfans/archive/2013/04/16/3025186.html
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