【Java】【web】获取访问项目路径

• 获取访问根地址

String baseUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";

• 获取访问项目跟目录

String basePath = request.getServletContext().getRealPath("/");

• 获取当前class文件目录

String currentClassPath = Thread.currentThread().getContextClassLoader().getResource("").getPath();

• 获取当前访问脚本目录

String currentFilePath = request.getServletPath();
// 或使用
String currentFilePath = request.getRequestURI();

• 获取当前访问全地址

String currentRequestUrl = request.getRequestURL();

• base标签
  在base标签中的url属性值会当前页面中所有的url前面插入
  • index.jsp

  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <%String baseUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";%>
  
  
      
      
      
  
  
  JDemo
  ajax测试
  
  
  
  

  • IndexServlet.java

  package com.demo;
  
  import javax.servlet.ServletException;
  import javax.servlet.annotation.WebServlet;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.util.Map;
  
  @WebServlet(name = "IndexServlet")
  public class IndexServlet extends HttpServlet {
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      request.setCharacterEncoding("utf-8");
      response.setContentType("text/html; charset=utf-8");
      PrintWriter out = response.getWriter();
  
      Map parameterMap = request.getParameterMap();
      for (Map.Entry m :
              parameterMap.entrySet()) {
          String name = m.getKey();
          String[] values = m.getValue();
          for (String value :
                  values) {
              System.out.print(name + ":" + value);
          }
          System.out.println();
      }
      out.print("ok");
  }
  
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      request.setCharacterEncoding("utf-8");
      response.setContentType("text/html; charset=utf-8");
      PrintWriter out = response.getWriter();
  
      request.getRequestDispatcher("/index.jsp").forward(request, response);
  }
  }