struts.xml
<package name="default" namespace="/" extends="struts-default">
<action name="upload" class="com.imooc.action.FileUploadAction">
<result>/jsp/03.jsp</result>
<result name="input">/jsp/error.jsp</result>
<!-- 配置攔截器限制上傳文件類型及大小 -->
<interceptor-ref name="fileUpload">
<param name="allowedTypes">image/bmp,image/x-png,image/gif,image/jpeg</param>
<param name="maximumSize">2M</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>
相對應的form表單
<form action="upload.action" method="post" enctype="multipart/form-data">上傳文件1：<input type="file" name="upload"><br>
上傳文件2：<input type="file" name="upload"><br>
上傳文件3：<input type="file" name="upload"><br>
<input type="submit" value="提交">${result}
</form>
文件上傳的action類
package com.imooc.action;
import java.io.File;
import java.util.List;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class FileUploadAction extends ActionSupport {
//若不是批量上傳，只需要將類型去掉List和泛型且不用循環上傳
private List<File> upload;//上傳文件內容
private List<String> uploadContentType;//上傳文件類型
private List<String> uploadFileName;//上傳文件的名稱
private String result;//定義一個result，方便用戶在前端頁面知道上傳信息
public List<File> getUpload() {
return upload;
}
public void setUpload(List<File> upload) {
this.upload = upload;
}
public List<String> getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}
public List<String> getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
@Override
public String execute() throws Exception {
//上傳文件的路徑
String path = ServletActionContext.getServletContext().getRealPath("/images");
File file = new File(path);
if(!file.exists()){
file.mkdir();//若不存在，則創建
}
//循環將批量上傳的文件保存到本地
for(int i=0;i<upload.size();i++){
FileUtils.copyFile(upload.get(i), new File(file,uploadFileName.get(i)));
}
result="上傳成功！";
return SUCCESS;
}
}
上傳錯誤文件處理（app_zh_CN.properties）
相對於某種上傳的異常，返回給用戶友好的提示
1.新建app_zh_CN.properties
添加要聲明的異常
2.在struts.xml文件中引用聲明國際化app_zh_CN.properties文件
<!-- 聲明國際友好提示，當文件上傳出現錯誤時 -->
<constant name="struts.custom.i18n.resources" value="app"></constant>
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