struts2檔案下載例項
阿新 • • 發佈：2019-01-05
jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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>Insert title here</title> </head> <body> <a href="upload/20161012_094556771_7237.doc">20161012_094556771_7237.doc</a><br/> <a href="down?file=20161012_093223812_7769.jpg">20161012_093223812_7769.jpg</a> </body> </html>
action
package com.zucc.action; import java.io.FileInputStream; import java.io.InputStream; import java.io.UnsupportedEncodingException; import javax.servlet.ServletContext; import org.apache.struts2.util.ServletContextAware; import com.opensymphony.xwork2.ActionSupport; public class FileDownloadAction extends ActionSupport implements ServletContextAware{ private String file; private InputStream is; private ServletContext application; private String downDir; public String getFile() throws UnsupportedEncodingException { //解決傳送到網頁檔名出現亂碼的問題 return new String(this.file.getBytes("utf-8"),"ISO-8859-1"); } public void setFile(String file) throws Exception { //解決從網頁獲取檔名的亂碼問題 this.file = new String(file.getBytes("ISO-8859-1"),"utf-8"); } public InputStream getIs() { return is; } public void setIs(InputStream is) { this.is = is; } @Override public String execute() throws Exception { System.out.println("FileDownloadAction execute..."); System.out.println("file:"+file); //獲取檔案路徑 this.is = new FileInputStream(this.downDir + "/" + file); return SUCCESS; } @Override public void setServletContext(ServletContext context) { this.application = context; this.downDir = application.getRealPath("/upload"); } }
struts.xml
注意：結果型別必須要寫成 type="stream" ,與之對應的處理類是 org.apache.struts2.dispatcher.StreamResult<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <constant name="struts.enable.DynamicMethodInvocation" value="true" /> <constant name="struts.devMode" value="true" /> <constant name="struts.ognl.allowStaticMethodAccess" value="true"/> <package name="default" namespace="/" extends="struts-default"> <action name="down" class="com.zucc.action.FileDownloadAction"> <result name="success" type="stream"> <!-- 這個is名字要和FileDownloadAction.java類中的型別為InputStream的變數名一致 --> <param name="inputName">is</param> <!-- 1) contentDisposition預設是 inline（內聯的), 比如說下載的檔案是文字型別的，就直接在網頁上開啟 ，不能直接開啟的才會開啟下載框自己選擇 2) attachment ：下載時會開啟下載框 3) fileName="${fileName}" ：在這定義的名字是一個動態的，該名字是顯示在下載框上的檔名字 --> <param name="contentDisposition">attachment;fileName="${file}"</param> <!-- 一次性讀取的位元組大小 --> <param name="bufferSize">1024</param> </result> </action> </package> </struts>