Struts2 文件上传下载含下载时中文乱码

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对于struts2一直都是看过，很少去动手写里面的功能，今天花了一点时间算整理整理。

整体的项目大致如下：

1：文件上传

uploadAction.java

package action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {private static final long serialVersionUID = -8920466592471253212L;private String title;private File file; // 上传的文件private String fileFileName; // 文件名称private String fileContentType; // 文件类型private String savePath;private String contents = "";public String execute() throws Exception {// String url = getSavePath() + File.separator + getFileFileName();String url = getSavePath();System.out.println("url==" + url + ",,," + getFileContentType());FileOutputStream fos = null;FileInputStream fis = null;try {// fos = new FileOutputStream(url);File uploadFile = new File(url, this.getFileFileName());fos = new FileOutputStream(uploadFile);fis = new FileInputStream(getFile());byte[] buffer = new byte[1024 * 1024];int len = 0;while ((len = fis.read(buffer)) > 0) {fos.write(buffer, 0, len);setContents(getContents() + new String(buffer));}fos.flush();} catch (Exception e) {e.printStackTrace();return INPUT;} finally {close(fos, fis);}return SUCCESS;}public File getFile() {return file;}public void setFile(File file) {this.file = file;}public String getFileFileName() {return fileFileName;}public void setFileFileName(String fileFileName) {this.fileFileName = fileFileName;}public String getFileContentType() {return fileContentType;}public void setFileContentType(String fileContentType) {this.fileContentType = fileContentType;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getSavePath() {String result = ServletActionContext.getServletContext().getRealPath(savePath);return result;}public void setSavePath(String savePath) {this.savePath = savePath;}public String getContents() {return contents;}public void setContents(String contents) {this.contents = contents;}private void close(FileOutputStream fos, FileInputStream fis) {if (fis != null) {try {fis.close();} catch (IOException e) {System.out.println("FileInputStream关闭失败");e.printStackTrace();}}if (fos != null) {try {fos.close();} catch (IOException e) {System.out.println("FileOutputStream关闭失败");e.printStackTrace();}}}}

上传页面upload.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib prefix="s" uri="/struts-tags" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">         <title>上传文件</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page">  </head>    <body>    <s:form action="uploads" method="post" enctype="multipart/form-data">    <s:textfield id="title" name="title" label="文件标题"/>    <s:file name="file" label="上传文件"/>    <s:submit value="提交"/>    </s:form>  </body></html>

上传成功uploadSuccess.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib prefix="s" uri="/struts-tags" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page">  </head>    <body>    上传文件：<s:property value="title" /><br/>    文件内容：    <s:if test="%{fileContentType.indexOf('image')>=0}">    <img src="<s:property value="'upload/'+fileFileName"/>"/>    </s:if>    <s:else>    <s:property value="contents"/>    </s:else>  </body></html>

主要的struts.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><constant name="struts.devMode" value="true" /><constant name="struts.i18n.encoding" value="UTF-8" /><package name="myDemo" extends="struts-default" namespace="/"><action name="uploads" class="action.UploadAction" ><param name="savePath">/upload</param><result name="input">/upload.jsp</result><result name="success">/uploadSuccess.jsp</result></action><action name="downloads" class="action.DownloadAction"><param name="inputPath">upload</param><result name="input">/downloadSuccess.jsp</result>            <result name="success" type="stream">                <param name="contentType">application/octet-stream;charset=ISO8859-1 </param>                <param name="inputName">downloadFile</param>                <param name="contentDisposition">attachment;filename="${downloadFileName}"</param>                <param name="bufferSize">4096</param>            </result></action><action name="download" class="action.DownloadAction" method="download">            <param name="inputPath">upload</param>            <result name="success" >/download.jsp            </result></action><!-- <action name="*"><result>/{1}.jsp</result></action> --></package></struts>

对于上传主要在action哩，主要有3个属性：***、***FileName、***ContentTyp。我的例子**为file。

成功后，页面若是图片形式，我把它显示出来，如果不是就显示里面的内容。

2：文件下载

文件下载主要配置在struts.xml里。

一般使用result=“stream” 在struts中进行文件下载

有4个参数：contentType（主要）、contentDisposition（主要）、inputName、bufferSize，相对于这2个主要些。

详细的可以参考这个页面：强烈碰击

常常也会在下载的时候碰到一个异常：Can not find a java.io.InputStream with the name [downloadFile] in the invocation stack. Check the <param name="inputName"> tag specified for this action.

主要为2中情况：

第一：文件路径不对，没有取到文件，只需要在return之前，把流放在system.out.println()中输出一下，是null的话，就是路径不对。

第二：action中需要配置"<param name="inputName">"后面属性的那个get方法。

下载action：downloadAction.java

package action;import java.io.File;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.List;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class DownloadAction extends ActionSupport {private static final long serialVersionUID = -5772950074616179246L;// the download fileprivate String fileName;// the download folderprivate String inputPath;// all files of the download folderprivate List<String> fileNames;public String getFileName() {return fileName;}public void setFileName(String fileName) {//System.out.println("----"+fileName);try {fileName = new String(fileName.getBytes("ISO-8859-1"),"UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}//System.out.println("----"+fileName);this.fileName = fileName;}public String getInputPath() {return inputPath;}public void setInputPath(String inputPath) {this.inputPath = inputPath;}public InputStream getDownloadFile() {String urll = File.separator + inputPath + File.separator + fileName;InputStream is = ServletActionContext.getServletContext().getResourceAsStream(urll);//System.out.println(urll+"-----"+fileName+"---"+is);return is;}public String getDownloadFileName() {String downFileName = fileName;//System.out.println("----"+downFileName);try {downFileName = new String(downFileName.getBytes(), "ISO8859-1");} catch (UnsupportedEncodingException e) {e.printStackTrace();}//System.out.println("----"+downFileName);return downFileName;}public String download() throws Exception {String downloadDir = ServletActionContext.getServletContext().getRealPath(File.separator + inputPath);File rootFile = new File(downloadDir);File[] files = rootFile.listFiles();fileNames = new ArrayList<String>();for (File f : files) {if (!f.isDirectory()) {String name = f.getName();//System.out.println(name);fileNames.add(name);}}return SUCCESS;}public List<String> getFileNames() {return fileNames;}public void setFileNames(List<String> fileNames) {this.fileNames = fileNames;}}

下载页面download.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"></head><body><font color="blue">--------------------------</font><br><s:iterator value="fileNames" var="file"><s:set value="file" id="files" name="files" scope="Request"/><%String fname = (String)request.getAttribute("files");fname = java.net.URLEncoder.encode(fname, "UTF-8");%><a href="downloads.action?fileName=<%=fname %>"> <s:property value="file" />下载</a><br /></s:iterator></body></html>

3个乱码的地方：

a：前台中文，后台获取：

public void setFileName(String fileName) {//System.out.println("----"+fileName);try {fileName = new String(fileName.getBytes("ISO-8859-1"),"UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}//System.out.println("----"+fileName);this.fileName = fileName;}

在未URLEncoder之前：

b:下载时显示中文名字：

public String getDownloadFileName() {String downFileName = fileName;//System.out.println("----"+downFileName);try {downFileName = new String(downFileName.getBytes(), "ISO8859-1");} catch (UnsupportedEncodingException e) {e.printStackTrace();}//System.out.println("----"+downFileName);return downFileName;}

<action name="downloads" class="action.DownloadAction"><param name="inputPath">upload</param><result name="input">/downloadSuccess.jsp</result>            <result name="success" type="stream">                <param name="contentType">application/octet-stream;charset=ISO8859-1 </param>                <param name="inputName">downloadFile</param>                <param name="contentDisposition">attachment;filename="${downloadFileName}"</param>                <param name="bufferSize">4096</param>            </result></action>

主要为action配置时配置contentDisposition参数，attachment;filename="${downloadFileName}"，

取的就为getDownloadFileName()的值。

c:链接中的中文编码

<s:iterator value="fileNames" var="file"><s:set value="file" id="files" name="files" scope="Request"/><%String fname = (String)request.getAttribute("files");fname = java.net.URLEncoder.encode(fname, "UTF-8");%><a href="downloads.action?fileName=<%=fname %>"> <s:property value="file" />下载</a><br /></s:iterator>

本Demo可以自这里下载到：惨不忍睹的点击

Struts2 文件上传下载 含下载时中文乱码

Struts2 文件上传下载含下载时中文乱码