struts中文件的上传和下载

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struts中文件的上传和下载
首先我们还是新建一个新的web project 取名为upload_test

然后在WebRoot中新建两个jsp页面 upload.jsp 和result.jsp

代码分别例如以下：
upload.jsp

Jsp代码

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
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>
<form action='result.jsp' name='upload'>
                            username : <input name='name' type='text'><br>
                            file : <input name='file' type='file' >
                            <br>
                            <input type='submit'  value='submit' name='submit'>
                    </form>


  </body>
</html>

然后是result.jsp页面：

Jsp代码

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page import='java.io.*' %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'result.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>


                                   <%
                                                InputStream is  = request.getInputStream();          //         新建一个inputstream对象  注意应该在这个页面中导入java.io.*包

                                                 BufferedReader bu = new BufferedReader( new InputStreamReader(is));                  // 将输入的内容转换成字符流

                                                 String buffer = null;

                                                 while( (buffer = bu.readLine()) != null )                        //假设还有内容怎继续输出
                                                 {
                                                     out.print(buffer+"<br>");
                                                 }

                                   %>
  </body>
</html>

这种基本课能够上传了
点击文件后点击提交那么跳转到了result.jsp页面但是没有不论什么信息输出这是怎么回事呢
这里要注意的是在文件上上传的表单中必需要包括两个内容
method='post' 还有 enctype='multipart/form-data'
加上这两个内容后，再试一次就成功了
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原文地址：https://www.cnblogs.com/wgwyanfs/p/6855827.html