前端jsp页面script引入url项目名使用${appName}

新建一个com.autumn.servlet.Dispatcher.java文件

package com.autumn.servlet;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

/**
 * Created by Administrator on 2018/6/6.
 */
public class Dispatcher extends org.springframework.web.servlet.DispatcherServlet {
    private static final long serialVersionUID = -7677752525845571027L;
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        String appName = config.getInitParameter("appName").trim();     //web.xml中初始化参数
        config.getServletContext().setAttribute("appName", appName);   //将这个appName放入servletContext中
    }
}

    <!-- springmvc的前端控制器 -->
    <servlet>
        <servlet-name>bookkeep-web</servlet-name>
        <servlet-class>com.autumn.servlet.Dispatcher</servlet-class>   <!--原来为org.springframework.web.servlet.DispatcherServlet-->
        <!-- contextConfigLocation不是必须的， 如果不配置contextConfigLocation， springmvc的配置文件默认在：WEB-INF/servlet的name+"-servlet.xml" -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/Springmvc.xml</param-value>
        </init-param>
        <init-param>
            <param-name>appName</param-name>
            <param-value>Bookkeeping</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>bookkeep-web</servlet-name>
        <!-- 拦截所有请求jsp除外 -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">
    <!-- 扫描controller驱动 -->
    <context:component-scan base-package="com.autumn.controller" />
    <!-- 注解驱动 -->
    <mvc:annotation-driven />

    <!--controller返回的视图解析器,例如返回login，实际解析为http://ip:port/projectName/WEB-INF/jsp/login.jsp-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

Controler测试

@Controller
@RequestMapping("/loginController")
public class LoginController {
    @Autowired
    public LoginService loginService;

    @RequestMapping("/login/{id}")
    @ResponseBody   //将返回的对象解析成json字符串
    public Account login(@PathVariable String id){
        Account account = loginService.login(id);
        return account;   //返回json字符串
    }

    @RequestMapping("/loginpage/{id}")
    public String loginpage(@PathVariable String id){
        Account account = loginService.login(id);
        if (account==null) {
            return "login";   //返回springmvc中配置的/WEB-INF/jsp/login.jsp
        }else {
            return "index";    //返回springmvc中配置的/WEB-INF/jsp/index.jsp
        }
    }
}

其他方法

不用统一管理的${appName}可以用<base href="">标签

<base> 标签为页面上的所有链接规定默认地址或默认目标。通常情况下，浏览器会从当前文档的 URL 中提取相应的元素来填写相对 URL 中的空白。

jsp中先声明schema://server:port/contextpath/

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

然后在页面上声明base标签，指定base的url

<base href="<%=basePath%>">

这样的话页面中所有的图片或这里链接都会在schema://server:port/contextpath/下面找