春季休养服务不起作用

Question

I am new to spring and trying to develop a basic web service using spring(with maven). I am unable to make out whats the error: Here are the files I have:

web.xml (is under WEB-INF)

    <!DOCTYPE web-app PUBLIC  
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"  
 "http://java.sun.com/dtd/web-app_2_3.dtd" >  

<web-app>  
  <display-name>Archetype Created Web Application</display-name>  
  <servlet>  
 <servlet-name>springrest</servlet-name>  
 <servlet-class>  
  org.springframework.web.servlet.DispatcherServlet  
 </servlet-class>  
 <load-on-startup>1</load-on-startup>  
</servlet>  

<servlet-mapping>  
 <servlet-name>springrest</servlet-name>  
 <url-pattern>/</url-pattern>  
</servlet-mapping>  
</web-app> 

---

springrest-servlet.xml(is under WEB-INF)

  <beans xmlns="http://www.springframework.org/schema/beans"  
 xmlns:context="http://www.springframework.org/schema/context"  
 xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
 xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context   
        http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">  

 <mvc:annotation-driven/>  
<context:component-scan base-package="com.sample." />  

CountryController.java

package com.sample.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.sample.model.Country;  

@RestController  
public class CountryController {  

 @RequestMapping(value = "/countries", method = RequestMethod.GET,headers="Accept=application/json")  
 public List<Country> getCountries()  
 {  
  List<Country> listOfCountries = new ArrayList<Country>();  
  listOfCountries=createCountryList();  
  return listOfCountries;  
 }  

 @RequestMapping(value = "/country/{id}", method = RequestMethod.GET,headers="Accept=application/json")  
 public Country getCountryById(@PathVariable int id)  
 {  
  List<Country> listOfCountries = new ArrayList<Country>();  
  listOfCountries=createCountryList();  
  for (Country country: listOfCountries) {  
   if(country.getId()==id)  
    return country;  
  }  

  return null;  
 }  

// Utiliy method to create country list.  
 public List<Country> createCountryList()  
 {  
  Country indiaCountry=new Country(1, "India");  
  Country chinaCountry=new Country(4, "China");  
  Country nepalCountry=new Country(3, "Nepal");  
  Country bhutanCountry=new Country(2, "Bhutan");  


  List<Country> listOfCountries = new ArrayList<Country>();  
  listOfCountries.add(indiaCountry);  
  listOfCountries.add(chinaCountry);  
  listOfCountries.add(nepalCountry);  
  listOfCountries.add(bhutanCountry);  
  return listOfCountries;  
 }  
}  

Country.java

package com.sample.model;



public class Country {

    int id;
    String name;


    public Country(int id, String name) {
        super();
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

I run the same on tomcat, and then , the response shows No Data Found.

Answer 1

First of all ur bas package must be somthing like this

<context:component-scan base-package="com.sample" /> 

and not

<context:component-scan base-package="com.sample." /> 

Answer 2

servlet映射是错误的也，代替<url-pattern>/</url-pattern>应该<url-pattern>/*</url-pattern>作为指定这里 。