Java中获取 相对、绝对路径

 request.getRequestURI();
 request.getRealPath(request.getRequestURI());//直接得到路径

String a = ToLoginAction.class.getResource("/").toString();//得到当前类的所在路径

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//JSP中
out.println("根目录所对应的绝对路径:" + request.getRequestURI() + "<br/>");

String strPathFile = application.getRealPath(request.getRequestURI());
out.println("文件的绝对路径:" + strPathFile+ "<br/>");
out.println(application.getRealPath(request.getRequestURI()));
String strDirPath = new File(application.getRealPath(request.getRequestURI())).getParent();
out.println("目录的绝对路径:" + strDirPath + "<br/>");
%>

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//Servlet中
//JSP中的application对象就是Servlet中的ServerContext，所以在Servlet中是如此获得
//import java.io.File;

System.out.println("根目录所对应的绝对路径:" + request.getServletPath() + "<br/>");

String strPathFile = request.getSession().getServletContext().getRealPath(request.getRequestURI());
System.out.println("文件的绝对路径:" + strPathFile + "<br/>");

String strDirPath = new File(request.getSession().getServletContext().getRealPath(request.getRequestURI())).getParent();
System.out.println("目录的绝对路径:" + strDirPath + "<br/>");