具有路径变量的Spring MVC映射 [英] Spring MVC mapping with path variable
本文介绍了具有路径变量的Spring MVC映射的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在具有丰富上下文的大型应用程序中，我遇到了一个问题，我花了一些时间来理解为什么未映射它.所以我试图创建一个简单的项目，并面对同样的问题:(
I have a problem in a big application with rich context, and I spent time to understand why it isn't mapped. So I tried to create simple project and face the same issue :(
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springapp</groupId>
<artifactId>testMvc</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>testMvc</name>
<properties>
<spring.version>4.1.1.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.4.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.4.3</version>
</dependency>
</dependencies>
<build>
<finalName>testMvc</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<includes>
<include>**/*Tests.java</include>
</includes>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>maven-jetty-plugin</artifactId>
<version>6.1.10</version>
<configuration>
<scanIntervalSeconds>10</scanIntervalSeconds>
<connectors>
<connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
<port>8080</port>
<maxIdleTime>60000</maxIdleTime>
</connector>
</connectors>
</configuration>
</plugin>
</plugins>
</build>
</project>
web.xml
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring MVC Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
上下文:
<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"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<mvc:annotation-driven>
<mvc:message-converters>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
</mvc:message-converters>
</mvc:annotation-driven>
<context:component-scan base-package="com.springapp.mvc"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
控制器:
package com.springapp.mvc;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.Map;
import static org.springframework.web.bind.annotation.RequestMethod.GET;
@RestController
@RequestMapping(value = "/items", produces = "application/json")
public class HelloController {
@RequestMapping(method = GET, value = "/${id}/item")
public Map<String, Object> printWelcome(@PathVariable("id") String id) {
Map<String, Object> model = new HashMap<>(1);
model.put("item", id);
return model;
}
@RequestMapping(method = GET, value = "/clear")
public Map<String, Object> printWelcome() {
Map<String, Object> model = new HashMap<>();
model.put("item", null);
return model;
}
}
测试:
GET http://localhost:8080/testMvc/items/clear => {"item":null}
GET http://localhost:8080/testMvc/items/1/item => 404 Not Found
怎么了?
推荐答案
将value = "/${id}/item")替换为value ="/{id}/item".这不是EL表达式，因此这里不需要$.
Replace value = "/${id}/item") into value ="/{id}/item". This is not EL expression , so no $ is needed here.
如果您想要的是用于Path变量的Regrex表达式，请将其放入{}中.语法为{varName:regex}，其中第一部分定义变量名称，第二部分定义正则表达式.
If what you want is a Regrex expression for Path variable, also put it into the {}. The syntax is {varName:regex} where the first part defines the variable name and the second - the regular expression .
Check Spring MVC Reference for more details of URI Template Patterns.
这篇关于具有路径变量的Spring MVC映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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