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
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;
}
}
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