使用 .war 文件部署时，为什么 getRealPath() 返回 null? [英] Why does getRealPath() return null when deployed with a .war file?
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."
"This method returns
nullif the servlet container cannot translate the virtual path to a real path for any reason (such as when the content is being made available from a .war archive)."
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IT屋！
