struts2下载文件时出现乱码问题

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动作类代码：

package com.itheima.web.action;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class DownLoadAction extends ActionSupport {private InputStream inputStream;private String fileName;public String downLoad() throws FileNotFoundException, UnsupportedEncodingException{String file = ServletActionContext.getServletContext().getRealPath("/WEB-INF/upload/1.jpg");//（此处假设服务器中有这个目录和文件）inputStream = new FileInputStream(file);fileName = "中文.jpg";/*方式一：fileName = URLEncoder.encode(fileName, "UTF-8");方式二：fileName = new String(fileName.getBytes("UTF-8"),"ISO8859-1");方式三：在结果视图中设置参数contentDisposition时用ognl表达式${@java.net.URLEncoder@encode(fileName,"UTF-8")}<param name="contentDisposition">attachment;filename=${@java.net.URLEncoder@encode(fileName,"UTF-8")}</param>*/return SUCCESS;}public InputStream getInputStream() {return inputStream;}public void setInputStream(InputStream inputStream) {this.inputStream = inputStream;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}}

struts2.xml中代码：

<?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.devMode" value="true" /><constant name="struts.ognl.allowStaticMethodAccess" value="true"/><package name="p1" extends="struts-default"><action name="downLoad" class="com.itheima.web.action.DownLoadAction" method="downLoad"><result name="success" type="stream"><param name="inputstream">inputStream</param><param name="contentType">application/octet-stream</param><!-- <param name="contentDisposition">attachment;filename=${fileName}</param> --><param name="contentDisposition">attachment;filename=${@java.net.URLEncoder@encode(fileName,"UTF-8")}</param></result></action></package></struts>

struts2下载文件出现中文乱码问题可以用动作类中的两个方法，也可以在设置struts2.xml中action的结果视图result的参数contentDisposition时，在给filename赋值时使用

ongl表达式${@java.net.URLEncoder@encode(fileName,"UTF-8")},(注意：此处的fileName要与动作类的fileName属性的get方法保持一致,否则下载的文件名就是download.action)由于此处使用ognl表达式使用了静态方法，所以要在前面开启struts2的中ognl静态方法，即设置常量<constant name="struts.ognl.allowStaticMethodAccess" value="true"/>相对于前两种方法第三种方法复杂一点点。

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