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

一、RequestMapping

1.可以写在方法上或类上，且值可以是数组

 1 package spittr.web;
 2 
 3 import static org.springframework.web.bind.annotation.RequestMethod.*;
 4 
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.ui.Model;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 
 9 @Controller
10 //@Component //也可用这个,但没有见名知义
11 //@RequestMapping("/")
12 @RequestMapping({"/", "/homepage"})
13 public class HomeController {
14 
15   //@RequestMapping(value="/", method=GET)
16   @RequestMapping(method = GET)
17   public String home(Model model) {
18     return "home";
19   }
20 
21 }

2.测试

 1 package spittr.web;
 2 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
 3 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
 4 import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;
 5 
 6 import org.junit.Test;
 7 import org.springframework.test.web.servlet.MockMvc;
 8 
 9 import spittr.web.HomeController;
10 
11 public class HomeControllerTest {
12 
13   @Test
14   public void testHomePage() throws Exception {
15     HomeController controller = new HomeController();
16     MockMvc mockMvc = standaloneSetup(controller).build();
17     mockMvc.perform(get("/homepage"))
18            .andExpect(view().name("home"));
19   }
20 
21 }

3.jsp

 1 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 2 <%@ page session="false" %>
 3 <html>
 4   <head>
 5     <title>Spitter</title>
 6     <link rel="stylesheet" 
 7           type="text/css" 
 8           href="<c:url value="/resources/style.css" />" >
 9   </head>
10   <body>
11     <h1>Welcome to Spitter</h1>
12 
13     <a href="<c:url value="/spittles" />">Spittles</a> | 
14     <a href="<c:url value="/spitter/register" />">Register</a>
15   </body>
16 </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

1 @RequestMapping(method = RequestMethod.GET)
2 public String spittles(Model model) {
3     model.addAttribute("spittleList",spittleRepository.findSpittles(Long.MAX_VALUE, 20));
4     return "spittles";
5 }

(3)也可用map替换model

1 @RequestMapping(method = RequestMethod.GET)
2 public String spittles(Map model) {
3     model.put("spittleList",spittleRepository.findSpittles(Long.MAX_VALUE, 20));
4     return "spittles";
5 }

(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

 1 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 2 <%@ taglib prefix="s" uri="http://www.springframework.org/tags"%>
 3 <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
 4 
 5 <html>
 6   <head>
 7     <title>Spitter</title>
 8     <link rel="stylesheet" type="text/css" href="<c:url value="/resources/style.css" />" >
 9   </head>
10   <body>
11     <div class="spittleForm">
12       <h1>Spit it out...</h1>
13       <form method="POST" name="spittleForm">
14         <input type="hidden" name="latitude">
15         <input type="hidden" name="longitude">
16         <textarea name="message" cols="80" rows="5"></textarea><br/>
17         <input type="submit" value="Add" />
18       </form>
19     </div>
20     <div class="listTitle">
21       <h1>Recent Spittles</h1>
22       <ul class="spittleList">
23         <c:forEach items="${spittleList}" var="spittle" >
24           <li id="spittle_<c:out value="spittle.id"/>">
25             <div class="spittleMessage"><c:out value="${spittle.message}" /></div>
26             <div>
27               <span class="spittleTime"><c:out value="${spittle.time}" /></span>
28               <span class="spittleLocation">(<c:out value="${spittle.latitude}" />, <c:out value="${spittle.longitude}" />)</span>
29             </div>
30           </li>
31         </c:forEach>
32       </ul>
33       <c:if test="${fn:length(spittleList) gt 20}">
34         <hr />
35         <s:url value="/spittles?count=${nextCount}" var="more_url" />
36         <a href="${more_url}">Show more</a>
37       </c:if>
38     </div>
39   </body>
40 </html>

3.测试

 1 package spittr.web;
 2 import static org.hamcrest.Matchers.*;
 3 import static org.mockito.Mockito.*;
 4 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
 5 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
 6 import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;
 7 
 8 import java.util.ArrayList;
 9 import java.util.Date;
10 import java.util.List;
11 
12 import org.junit.Test;
13 import org.springframework.test.web.servlet.MockMvc;
14 import org.springframework.web.servlet.view.InternalResourceView;
15 
16 import spittr.Spittle;
17 import spittr.data.SpittleRepository;
18 import spittr.web.SpittleController;
19 
20 public class SpittleControllerTest {
21 
22   @Test
23   public void shouldShowRecentSpittles() throws Exception {
24     List<Spittle> expectedSpittles = createSpittleList(20);
25     SpittleRepository mockRepository = mock(SpittleRepository.class);
26     when(mockRepository.findSpittles(Long.MAX_VALUE, 20))
27         .thenReturn(expectedSpittles);
28 
29     SpittleController controller = new SpittleController(mockRepository);
30     MockMvc mockMvc = standaloneSetup(controller)
31         .setSingleView(new InternalResourceView("/WEB-INF/views/spittles.jsp"))
32         .build();
33 
34     mockMvc.perform(get("/spittles"))
35        .andExpect(view().name("spittles"))
36        .andExpect(model().attributeExists("spittleList"))
37        .andExpect(model().attribute("spittleList", 
38                   hasItems(expectedSpittles.toArray())));
39   }
40 
41   @Test
42   public void shouldShowPagedSpittles() throws Exception {
43     List<Spittle> expectedSpittles = createSpittleList(50);
44     SpittleRepository mockRepository = mock(SpittleRepository.class);
45     when(mockRepository.findSpittles(238900, 50))
46         .thenReturn(expectedSpittles);
47     
48     SpittleController controller = new SpittleController(mockRepository);
49     MockMvc mockMvc = standaloneSetup(controller)
50         .setSingleView(new InternalResourceView("/WEB-INF/views/spittles.jsp"))
51         .build();
52 
53     mockMvc.perform(get("/spittles?max=238900&count=50"))
54       .andExpect(view().name("spittles"))
55       .andExpect(model().attributeExists("spittleList"))
56       .andExpect(model().attribute("spittleList", 
57                  hasItems(expectedSpittles.toArray())));
58   }
59   
60   @Test
61   public void testSpittle() throws Exception {
62     Spittle expectedSpittle = new Spittle("Hello", new Date());
63     SpittleRepository mockRepository = mock(SpittleRepository.class);
64     when(mockRepository.findOne(12345)).thenReturn(expectedSpittle);
65     
66     SpittleController controller = new SpittleController(mockRepository);
67     MockMvc mockMvc = standaloneSetup(controller).build();
68 
69     mockMvc.perform(get("/spittles/12345"))
70       .andExpect(view().name("spittle"))
71       .andExpect(model().attributeExists("spittle"))
72       .andExpect(model().attribute("spittle", expectedSpittle));
73   }
74 
75   @Test
76   public void saveSpittle() throws Exception {
77     SpittleRepository mockRepository = mock(SpittleRepository.class);
78     SpittleController controller = new SpittleController(mockRepository);
79     MockMvc mockMvc = standaloneSetup(controller).build();
80 
81     mockMvc.perform(post("/spittles")
82            .param("message", "Hello World") // this works, but isn't really testing what really happens
83            .param("longitude", "-81.5811668")
84            .param("latitude", "28.4159649")
85            )
86            .andExpect(redirectedUrl("/spittles"));
87     
88     verify(mockRepository, atLeastOnce()).save(new Spittle(null, "Hello World", new Date(), -81.5811668, 28.4159649));
89   }
90   
91   private List<Spittle> createSpittleList(int count) {
92     List<Spittle> spittles = new ArrayList<Spittle>();
93     for (int i=0; i < count; i++) {
94       spittles.add(new Spittle("Spittle " + i, new Date()));
95     }
96     return spittles;
97   }
98 }