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javaweb学习中的路径问题

發(fā)布時(shí)間：2023/12/6 编程问答 47 豆豆

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1. 項(xiàng)目結(jié)構(gòu)

2. 客戶端路徑

1. 超鏈接

2. 表單

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>頁(yè)面b</title> </head> <body><form action="http://localhost:8080/testPath/jsp/b.jsp" methoe="get">username:<input type="text" name="username" value=""> <inputtype="submit" value="提交---絕對(duì)地址 "></form><form action="/testPath/jsp/b.jsp" methoe="get">username:<input type="text" name="username" value=""> <inputtype="submit" value="提交---以/開(kāi)頭的相對(duì)地址"></form><form action="b.jsp" methoe="get">username:<input type="text" name="username" value=""> <inputtype="submit" value="提交---不以/開(kāi)頭的相對(duì)地址 "></form><form action="http://localhost:8080/testPath/PathServlet" methoe="get">username:<input type="text" name="username" value=""> <inputtype="submit" value="表單提交到Servlet---絕對(duì)地址"></form><form action="/testPath/PathServlet" methoe="get">username:<input type="text" name="username" value=""> <inputtype="submit" value="表單提交到Servlet---以/開(kāi)頭的相對(duì)地址"></form><form action="../PathServlet" methoe="get">username:<input type="text" name="username" value=""> <inputtype="submit" value="表單提交到Servlet---不以/開(kāi)頭的相對(duì)地址"></form> </body> </html>

3.重定向

package cn.test.path;import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** @author Guozhen_Zhao* 創(chuàng)建時(shí)間：2018年3月17日上午10:12:21* 備注：重定向有三種路徑書(shū)寫(xiě)方式 : * 1. 絕對(duì)路徑 * 2. 以"/"開(kāi)頭的相對(duì)路徑 * 3. 不以"/"開(kāi)頭的相對(duì)路徑 */ @WebServlet("/RedirectServlet") public class RedirectServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.sendRedirect("http://localhost:8080/testPath/jsp/b.jsp");/* * 2.以"/"開(kāi)頭的相對(duì)路徑 * 此時(shí)，/代表整個(gè)web工程的路徑，即http://localhost:8080/ */// response.sendRedirect("/testPath/jsp/b.jsp"); /* * 3.不以"/"開(kāi)頭的相對(duì)路徑 * 此時(shí)是相對(duì)于當(dāng)前資源的相對(duì)路徑 * 當(dāng)前資源路徑為:http://localhost:8080/testPath/RedirectServlet * 即表示:RedirectServlet在路徑http://localhost:8080/testPath之下 * 而b.jsp在http://localhost:8080/testPath/jsp/b.jsp * 所以最終地址寫(xiě)為:jsp/b.jsp */// response.sendRedirect("jsp/b.jsp"); }protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

服務(wù)器端路徑

請(qǐng)求轉(zhuǎn)發(fā)

package cn.test.path;import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** @author Guozhen_Zhao* 創(chuàng)建時(shí)間：2018年3月17日上午10:09:59* 備注：服務(wù)器端的路徑不能是絕對(duì)路徑，只能是相對(duì)路徑，也分為以/開(kāi)頭和不以/開(kāi)頭兩種 * 1.以"/"開(kāi)頭的相對(duì)路徑 * 2.不以"/"開(kāi)頭的相對(duì)路徑*/ @WebServlet("/DispatcherServlet") public class DispatcherServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/* * 1.以"/"開(kāi)頭的相對(duì)路徑 * 此時(shí)，/代表當(dāng)前web項(xiàng)目，即:http://localhost:8080/javaee */ // request.getRequestDispatcher("/jsp/b.jsp").forward(request, response); /* * 2.不以"/"開(kāi)頭的相對(duì)路徑 * 相對(duì)于當(dāng)前資源的相對(duì)路徑 * 此時(shí)，當(dāng)前資源的路徑為:http://localhost:8080/javaee/DispatcherServlet * 所以要轉(zhuǎn)發(fā)去的資源的路徑以:http://localhost:8080/javaee開(kāi)頭 */ request.getRequestDispatcher("jsp/b.jsp").forward(request, response); }protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

轉(zhuǎn)載于:https://blog.51cto.com/13416247/2087844

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