使用 .war 文件部署时，为什么 getRealPath() 返回 null?

本文介绍了使用 .war 文件部署时，为什么 getRealPath() 返回 null?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

getRealPath() 返回本地系统中的实际路径，但在使用 .war 文件部署时返回 null.

getRealPath() is returning the actual path in the local system, but returns null when deployed with a .war file.

<%@ page import="java.io.*" %>
<%@ page contentType="text/html;charset=ISO-8859-1" %> 
<%
int iLf = 10;
char cLf = (char)iLf;
String a= application.getResource("/");
//String myfile = application.getRealPath("/")+ "generate.xml";
//String myfile = request.getContextPath()+"generate.xml";
//String myfile = request.getRealPath("/")+"generate.xml";

out.println(myfile);    
File outputFile = new File(myfile);
outputFile.createNewFile();
FileWriter outfile = new FileWriter(outputFile);
outfile.write(" <?xml version='1.0' encoding='UTF-8'?> "+cLf);
outfile.write(" <playlist version='1' xmlns = 'http://xspf.org/ns/0/' > " +cLf);
outfile.write(" <title>My Band Rocks Your Socks</title> "+cLf); 
outfile.write("<trackList>"+cLf); 
%>
 <%! String[] sports; %>
 <%
    sports = request.getParameterValues("sports");

    out.println("<html><body><h1>hello</h1></body></html>");

    if (sports != null)
    { 
         for (int i = 0; i < sports.length; i++)
         { 
              // outfile.writeln (sports[i]); 
              String total=sports[i];
              String[] sa=total.split("[,]");
              // String[] sub=new String();
              outfile.write("<track>"+cLf);
              for (int j=0;j<sa.length;j++)
              {
                // outfile.writeln(sa[j]);
                // outfile.writeln("sa["+j+"]="+sa[j]);
                if( j == 0)
                {
                     outfile.write("<location>" + sa[0] +"</location>"+cLf); 
                }
                else if (j == 1)
                     {
                        outfile.write("<image>" + sa[1] +"</image>"+cLf); 
                     }
                     else if( j==2)
                          {
                            outfile.write("<title>" + sa[2] +"</title>"+cLf);
                          }

               }// end of inner for loop()       
               outfile.write("</track>"+cLf);
         //outfile.writeln();
      }// end of outer for()
    } 
    //else outfile.writeln ("<b>none<b>");

  outfile.write(" </trackList> "+cLf);
  outfile.write(" </playlist> "+cLf);
  outfile.close();

  %>
<object type="application/x-shockwave-flash" width="400" height="170"
          data="xspf_player.swf?playlist_url=generate.xml">
          <param name="movie" value="xspf_player.swf?playlist_url=generate.xml" />

</object>

谁能为我提供替代方案?如果您也展示一些示例代码，那将非常有帮助.

Can anyone provide me with an alternative for this?It would be very helpful if you showed some sample code too.

推荐答案

首先，ServletRequest.getRealPath(String path) 已弃用.适当的替换是:

For a start, ServletRequest.getRealPath(String path) is deprecated. The appropriate replacement is:

ServletContext context = session.getServletContext();
String realContextPath = context.getRealPath(request.getContextPath());

但是，ServletContext.getRealPath(String path) 状态:

如果 servlet 容器由于任何原因(例如当内容从 .war 存档中可用时)无法将虚拟路径转换为真实路径，则此方法返回 null."

API 正在履行其合同！但是，一切都没有丢失，因为您可以使用以下方法从 WAR 加载资源，如 ServletContext:

So the API is fulfilling its contract! However, all is not lost, as you can load a resource from the WAR using the following method, as defined in ServletContext:

ServletContext context = session.getServletContext();
InputStream is = context.getResourceAsStream("generate.xml");

这篇关于使用 .war 文件部署时，为什么 getRealPath() 返回 null?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！