web工程中和路径资源相关的方法及测试

httpreservlet中和路径相关的方法

request.getContextPath();

返回请求使用的实际上下文路径

request.getServletPath();

request.getRequestURL();

request.getRequestURI();

ServletContext中和路径相关的方法

servletContext servletContext = getServletContext();

servletContext.getContextPath();
servletContext.getRealPath("/");
servletContext.getREsourcePaths("/");

补充1：测试代码

package GQ.work;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestServletPath extends HttpServlet {
private static final long serialVersionUID = 1L;
public TestServletPath() {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");

System.out.println("request.getContextPath()"+request.getContextPath());
System.out.println("request.getServletPath()"+request.getServletPath());
System.out.println("request.getRequestURL()"+request.getRequestURL());
System.out.println("request.getRequestURI()"+request.getRequestURI());
ServletContext context = getServletContext();
System.out.println("getServletContext()"+context);
System.out.println("context.getContextPath()"+context.getContextPath());
System.out.println("context.getRealPath('/')"+context.getRealPath("/"));
System.out.println("context.getResourcePaths('/')"+context.getResourcePaths("/"));
}
}

补充2： 测试结果及说明

①request.getContextPath()

/JD1706_Servlet

获得上下文路径

②request.getServletPath()

/TestServletPath

返回该请求使用的实际上下文路径

③request.getRequestURL()

http://localhost:8088/JD1706_Servlet/TestServletPath

获得浏览器地址

④request.getRequestURI()

/JD1706_Servlet/TestServletPath

项目中的路径

⑤getServletContext()

org.apache.catalina.core.ApplicationContextFacade@608061bd

上下文对象

⑥context.getContextPath()

/JD1706_Servlet

上下文路径

⑦context.getRealPath(‘/’)

E:\Study\javaee\apache-tomcat-6.0.18\webapps\JD1706_Servlet\

获得一个绝对路径/代表项目名后的/

⑧context.getResourcePaths(‘/’)

[/META-INF/, /download/, /WEB-INF/, /dabang.jpg, /zhaohongli.jpg, /form/, /upload/]

获得一个路径下的所有资源