SpringMVC:绝对地址、相对地址(动力)

dengfengling999 2022-06-23 17:27:49 阅读数:337

springmvc地址绝对对地绝对地

 

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- 声明,注册springmvc的核心对象DispatcherServlet-->
<servlet>
<servlet-name>myweb</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 自定义springmvc读取的配置文件的位置-->
<init-param>
<!--springmvc的配置文件属性-->
<param-name>contextConfigLocation</param-name>
<!-- 指定自定义文件的位置-->
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!-- 在tomcat启动后,创建Servlet对象
load-on-startup:表示tomcat启动后创建对象的顺序,它的值是正数,数值越小 tomacat创建对象越早
-->
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 所有的*..do请求交给myweb中央处理器处理-->
<servlet-mapping>
<servlet-name>myweb</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>

 

springmvc.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 用了注解需要注解扫描器:声明组件扫描器:包扫描-->
<context:component-scan base-package="com.bjpowernode.controller"/>
<!-- 声明springmvc框架中的视图解析器,帮助开发人员设置视图文件的路径-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 前缀:视图文件的路径-->
<property name="prefix" value="/WEB-INF/view/"/>
<!-- 后缀:视图文件的扩展名-->
<property name="suffix" value=".jsp"/>
</bean>
</beans>

 MyController:

package com.bjpowernode.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/*
* @RequestMapping:
* value:所有请求地址的公共部分,叫做模块名称
* 位置:放在类的上面
* 通过加上一个类的访问路径,就可以看出这些功能属于user模块的*/
@Controller
public class MyController {
@RequestMapping(value ="/user/some.do") //value里面可以写多个名字进行访问
public ModelAndView doSome(){ //doSome相当于doGet()---调用Service请求处理
System.out.println("调用Sevice后:");//这里先不调用,简化处理
ModelAndView mv=new ModelAndView();
//添加数据,框架在请求的最后把数据放入到request作用域。
//request.setAttribute("msg","欢迎使用mvc开发")
mv.addObject("mgs","欢迎使用mvc开发");
mv.addObject("fun","执行的是dosome方法");
mv.setViewName("show");
//返回mv
return mv;
}
}

show.jsp:

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 19:01
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="<%=basePath%>">
</head>
<body>
<h3>show.jsp,从request作用域中获取数据</h3>
<h3>msg数据:${mgs}</h3>
<h3>fun数据:${fun}</h3>
</body>
</html>

index.jsp:

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="<%=basePath%>">
</head>
<body>
<h1>hellow word</h1>
<p><a href="user/some.do">发起some.do的get请求</a></p>
</body>
</html>

 

当访问地址不加 / 时:

访问的是:

当发起user/some.do请求后,地址变为:当前页面的地址加上连接的地址

http://localhost:8888/ch06_path_war_exploded/user/some.do 

 

 

当访问地址加上 / 时:

index.jsp:

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="<%=basePath%>">
</head>
<body>
<h1>hellow word</h1>
<p><a href="/user/some.do">发起some.do的get请求</a></p>
</body>
</html>

 

 

地址变为:这个地址缺的是项目名字

http://localhost:8888/user/some.do

参考地址是服务器地址:

可以在访问地址上加上项目名字,就可以正常访问了

index.jsp:

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="<%=basePath%>">
</head>
<body>
<h1>hellow word</h1>
<p><a href="/ch06_path_war_exploded/user/some.do">发起some.do的get请求</a></p>
</body>
</html>

http://localhost:8888/user/

 

 通过写上项目名字,但是这样不够灵活,这样写死了,如果项目访问地址(项目名字)改变了:导致url访问地址也得改变

 可以通过EL表达式解决:

代表项目的访问路径:

${pageContext.request.contextPath}

index.jsp:

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="<%=basePath%>">
</head>
<body>
<h1>hellow word</h1>
<p><a href="${pageContext.request.contextPath}/user/some.do">发起some.do的get请求</a></p>
</body>
</html>

 base标签

 

 

 改变控制器:MyController:让访问控制器跳转页面还是index.jsp:

package com.bjpowernode.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/*
* @RequestMapping:
* value:所有请求地址的公共部分,叫做模块名称
* 位置:放在类的上面
* 通过加上一个类的访问路径,就可以看出这些功能属于user模块的*/
@Controller
public class MyController {
@RequestMapping(value ="/user/some.do") //value里面可以写多个名字进行访问
public ModelAndView doSome(){ //doSome相当于doGet()---调用Service请求处理
System.out.println("调用Sevice后:");//这里先不调用,简化处理
ModelAndView mv=new ModelAndView();
//添加数据,框架在请求的最后把数据放入到request作用域。
//request.setAttribute("msg","欢迎使用mvc开发")
mv.addObject("mgs","欢迎使用mvc开发");
mv.addObject("fun","执行的是dosome方法");
mv.setViewName("/index.jsp");
//返回mv
return mv;
}
}

注释视图解析器:不用视图解析器

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 前缀:视图文件的路径-->
<property name="prefix" value="/WEB-INF/view/"/>
<!-- 后缀:视图文件的扩展名-->
<property name="suffix" value=".jsp"/>
</bean>

 

index.jsp:假设里面没有,url不加 / 

<base href="<%=basePath%>">
<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>hellow word</h1>
<p><a href="user/some.do">发起some.do的get请求</a></p>
</body>
</html>

第一次点击:

 

第二次点击:

 

 

index.jsp:

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="http://localhost:8888/ch06_path_war_exploded/">
</head>
<body>
<h1>hellow word</h1>
<p><a href="user/some.do">发起some.do的get请求</a></p>
</body>
</html>

 

 

 

<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2022/6/7
Time: 17:37
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<title>Title</title>
<base href="<%=basePath%>">
</head>
<body>
<h1>hellow word</h1>
<p><a href="user/some.do">发起some.do的get请求</a></p>
</body>
</html>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
request.getScheme() 获取协议
request.getServerName() 获取服务器IP
request.getServerPort() 获取端口号
getContextPath() 获取返回路径

在index页面中,所有没有 / 开头的参考地址都以<%=basePath%>为参考地址

版权声明:本文为[dengfengling999]所创,转载请带上原文链接,感谢。 https://blog.csdn.net/dengfengling999/article/details/125424708