SPRING IN ACTION 第4版笔记-第五章BUILDING SPRING WEB APPLICATIONS-002-Controller的requestMapping、model

时间：2022-02-28 07:09:23

一、RequestMapping

1.可以写在方法上或类上，且值可以是数组

 package spittr.web;

 import static org.springframework.web.bind.annotation.RequestMethod.*;

 import org.springframework.stereotype.Controller;

 import org.springframework.ui.Model;

 import org.springframework.web.bind.annotation.RequestMapping;

 @Controller

 //@Component //也可用这个,但没有见名知义

 //@RequestMapping("/")

 @RequestMapping({"/", "/homepage"})

 public class HomeController {

   //@RequestMapping(value="/", method=GET)

   @RequestMapping(method = GET)

   public String home(Model model) {

     return "home";

   }

 }

2.测试

 package spittr.web;

 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;

 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

 import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;

 import org.junit.Test;

 import org.springframework.test.web.servlet.MockMvc;

 import spittr.web.HomeController;

 public class HomeControllerTest {

   @Test

   public void testHomePage() throws Exception {

     HomeController controller = new HomeController();

     MockMvc mockMvc = standaloneSetup(controller).build();

     mockMvc.perform(get("/homepage"))

            .andExpect(view().name("home"));

   }

 }

3.jsp

 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

 <%@ page session="false" %>

 <html>

   <head>

     <title>Spitter</title>

     <link rel="stylesheet"

           type="text/css"

           href="<c:url value="/resources/style.css" />" >

   </head>

   <body>

     <h1>Welcome to Spitter</h1>

     <a href="<c:url value="/spittles" />">Spittles</a> |

     <a href="<c:url value="/spitter/register" />">Register</a>

   </body>

 </html>

二、在controller中使用model,model实际就是一个map

1.controller

(1)

package spittr.web;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import spittr.Spittle;

import spittr.data.SpittleRepository;

@Controller

@RequestMapping("/spittles")

public class SpittleController {

    private SpittleRepository spittleRepository;

    @Autowired

    public SpittleController(SpittleRepository spittleRepository) {

        this.spittleRepository = spittleRepository;

    }

    @RequestMapping(method = RequestMethod.GET)

    public String spittles(Model model) {

        model.addAttribute(spittleRepository.findSpittles(Long.MAX_VALUE, 20));

        return "spittles";

    }

}

如果在addAttribute时没有指定key，则spring会根据存入的数据类型来生成key,如上面存入的数据类型是List<Spittle>,所以key就是spittleList

(2)也可以明确key

 @RequestMapping(method = RequestMethod.GET)

 public String spittles(Model model) {

     model.addAttribute("spittleList",spittleRepository.findSpittles(Long.MAX_VALUE, 20));

     return "spittles";

 }

(3)也可用map替换model

 @RequestMapping(method = RequestMethod.GET)

 public String spittles(Map model) {

     model.put("spittleList",spittleRepository.findSpittles(Long.MAX_VALUE, 20));

     return "spittles";

 }

(4)不返回string，直接返回数据类型

@RequestMapping(method = RequestMethod.GET)

public List < Spittle > spittles() {

    return spittleRepository.findSpittles(Long.MAX_VALUE, 20));

}

When a handler method returns an object or a collection like this, the value returned is put into the model, and the model key is inferred from its type ( spittleList , as in the other examples).
As for the logical view name, it’s inferred from the request path. Because this method handles GET requests for /spittles, the view name is spittles (chopping off the leading slash).

2.View

在jsp中用jstl解析数据

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

 <%@ taglib prefix="s" uri="http://www.springframework.org/tags"%>

 <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

 <html>

   <head>

     <title>Spitter</title>

     <link rel="stylesheet" type="text/css" href="<c:url value="/resources/style.css" />" >

   </head>

   <body>

     <div class="spittleForm">

       <h1>Spit it out...</h1>

       <form method="POST" name="spittleForm">

         <input type="hidden" name="latitude">

         <input type="hidden" name="longitude">

         <textarea name="message" cols="80" rows="5"></textarea><br/>

         <input type="submit" value="Add" />

       </form>

     </div>

     <div class="listTitle">

       <h1>Recent Spittles</h1>

       <ul class="spittleList">

         <c:forEach items="${spittleList}" var="spittle" >

           <li id="spittle_<c:out value="spittle.id"/>">

             <div class="spittleMessage"><c:out value="${spittle.message}" /></div>

             <div>

               <span class="spittleTime"><c:out value="${spittle.time}" /></span>

               <span class="spittleLocation">(<c:out value="${spittle.latitude}" />, <c:out value="${spittle.longitude}" />)</span>

             </div>

           </li>

         </c:forEach>

       </ul>

       <c:if test="${fn:length(spittleList) gt 20}">

         <hr />

         <s:url value="/spittles?count=${nextCount}" var="more_url" />

         <a href="${more_url}">Show more</a>

       </c:if>

     </div>

   </body>

 </html>

3.测试

 package spittr.web;

 import static org.hamcrest.Matchers.*;

 import static org.mockito.Mockito.*;

 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;

 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

 import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;

 import java.util.ArrayList;

 import java.util.Date;

 import java.util.List;

 import org.junit.Test;

 import org.springframework.test.web.servlet.MockMvc;

 import org.springframework.web.servlet.view.InternalResourceView;

 import spittr.Spittle;

 import spittr.data.SpittleRepository;

 import spittr.web.SpittleController;

 public class SpittleControllerTest {

   @Test

   public void shouldShowRecentSpittles() throws Exception {

     List<Spittle> expectedSpittles = createSpittleList(20);

     SpittleRepository mockRepository = mock(SpittleRepository.class);

     when(mockRepository.findSpittles(Long.MAX_VALUE, 20))

         .thenReturn(expectedSpittles);

     SpittleController controller = new SpittleController(mockRepository);

     MockMvc mockMvc = standaloneSetup(controller)

         .setSingleView(new InternalResourceView("/WEB-INF/views/spittles.jsp"))

         .build();

     mockMvc.perform(get("/spittles"))

        .andExpect(view().name("spittles"))

        .andExpect(model().attributeExists("spittleList"))

        .andExpect(model().attribute("spittleList",

                   hasItems(expectedSpittles.toArray())));

   }

   @Test

   public void shouldShowPagedSpittles() throws Exception {

     List<Spittle> expectedSpittles = createSpittleList(50);

     SpittleRepository mockRepository = mock(SpittleRepository.class);

     when(mockRepository.findSpittles(238900, 50))

         .thenReturn(expectedSpittles);

     SpittleController controller = new SpittleController(mockRepository);

     MockMvc mockMvc = standaloneSetup(controller)

         .setSingleView(new InternalResourceView("/WEB-INF/views/spittles.jsp"))

         .build();

     mockMvc.perform(get("/spittles?max=238900&count=50"))

       .andExpect(view().name("spittles"))

       .andExpect(model().attributeExists("spittleList"))

       .andExpect(model().attribute("spittleList",

                  hasItems(expectedSpittles.toArray())));

   }

   @Test

   public void testSpittle() throws Exception {

     Spittle expectedSpittle = new Spittle("Hello", new Date());

     SpittleRepository mockRepository = mock(SpittleRepository.class);

     when(mockRepository.findOne(12345)).thenReturn(expectedSpittle);

     SpittleController controller = new SpittleController(mockRepository);

     MockMvc mockMvc = standaloneSetup(controller).build();

     mockMvc.perform(get("/spittles/12345"))

       .andExpect(view().name("spittle"))

       .andExpect(model().attributeExists("spittle"))

       .andExpect(model().attribute("spittle", expectedSpittle));

   }

   @Test

   public void saveSpittle() throws Exception {

     SpittleRepository mockRepository = mock(SpittleRepository.class);

     SpittleController controller = new SpittleController(mockRepository);

     MockMvc mockMvc = standaloneSetup(controller).build();

     mockMvc.perform(post("/spittles")

            .param("message", "Hello World") // this works, but isn't really testing what really happens

            .param("longitude", "-81.5811668")

            .param("latitude", "28.4159649")

            )

            .andExpect(redirectedUrl("/spittles"));

     verify(mockRepository, atLeastOnce()).save(new Spittle(null, "Hello World", new Date(), -81.5811668, 28.4159649));

   }

   private List<Spittle> createSpittleList(int count) {

     List<Spittle> spittles = new ArrayList<Spittle>();

     for (int i=0; i < count; i++) {

       spittles.add(new Spittle("Spittle " + i, new Date()));

     }

     return spittles;

   }

 }

相关文章