配置xml：

<?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><package name="down" namespace="/down" extends="struts-default"><action name="down_*" class="star.july.a_download.DownloadAction" method="{1}"><!-- 配置下載視圖：stream --><result name="down" type="stream"><!-- 給視圖注入參數 --><!-- 彈出框內容 --><param name="contentDisposition">${fileName}</param><!-- 一次讀取文件大小 --><param name="buffersize">512</param><!-- 提供需要下載的文件 --><param name="inputName">fileContext</param></result></action></package></struts>
編寫Action類：

</pre><pre name="code" class="java">package star.july.a_download; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.net.URLEncoder; import javax.servlet.http.HttpServletRequest; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class DownloadAction extends ActionSupport {File file = null;// 設置下載文件內容public InputStream getFileContext() {try {file = new File("C:/Users/Starjuly/Pictures/Saved Pictures/拿畫筆的女孩.jpg");InputStream in = new FileInputStream(file);return in;} catch (FileNotFoundException e) {e.printStackTrace();throw new RuntimeException(e);}}// 返回文件名稱public String getFileName() {try {String disposition ="";HttpServletRequest request = ServletActionContext.getRequest();//獲取文件頭String head = request.getHeader("User-Agent");if(head.contains("firefox")){//火狐瀏覽器//火狐瀏覽器要在=號前加*才能識別中文disposition += "attachment;fileName*=";}else{//非火狐disposition += "attachment;fileName=";}String name = file.getName();//解決文件的中文名問題String str = URLEncoder.encode(name, "utf-8");return disposition+str;} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e);}}public String down() {// 返回一個下載視圖return "down";} }

總結

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