Spring MVC3构建Web应用第四步
现在我们开始设计控制器，鼠标右击src目录，选择新建-包，如下图：
并将包的名命名为paul.sydney.controller，在这个包中，新建立一个类，命名为PersonDisplay，将代码修改如下：
1
package paul.sydney.controller;
2
3import org.springframework.beans.factory.annotation.Autowired;
4import org.springframework.stereotype.Controller;
5import org.springframework.ui.ModelMap;
6import org.springframework.web.bind.annotation.RequestMapping;
7import org.springframework.web.bind.annotation.RequestParam;
8
9import paul.sydney.service.DummyService;
10
11
/**
12
* PersonDisplay class, display controller for the 'personDisplay.jsp'
13 * Copyright : adobocode.com , 2010
14 * @author Paul Sydney Orozco | xtrycatchx@gmail.com
15 *
16
*/
17@Controller
18public class PersonDisplay {
19
20 private final DummyService dummyService;
21
22 @Autowired
23
public PersonDisplay(DummyService dummyService) {
24 this.dummyService = dummyService;
25
}
26
27 @RequestMapping("/personDisplay.htm")
28 public ModelMap defaultHandler() {
29 return new ModelMap("personList", this.dummyService.getDummyList());
30 }
31 }
package paul.sydney.controller; 2
3
import org.springframework.beans.factory.annotation.Autowired; 4
import org.springframework.stereotype.Controller; 5
import org.springframework.ui.ModelMap; 6
import org.springframework.web.bind.annotation.RequestMapping; 7
import org.springframework.web.bind.annotation.RequestParam; 8
9
import paul.sydney.service.DummyService; 10
11
/** 
12
* PersonDisplay class, display controller for the 'personDisplay.jsp' 13
* Copyright : adobocode.com , 2010 14
* @author Paul Sydney Orozco | xtrycatchx@gmail.com 15
* 16
*/17
@Controller18
public class PersonDisplay { 19
20
private final DummyService dummyService; 21
22
@Autowired23
public PersonDisplay(DummyService dummyService) { 
24
this.dummyService = dummyService; 25
} 26
27
@RequestMapping("/personDisplay.htm") 28
public ModelMap defaultHandler() { 29
return new ModelMap("personList", this.dummyService.getDummyList()); 30
} 31
}
这里，使用注解@Controller表示这个是一个控制器，而 @RequestMapping("/personDisplay.htm")则表示对于personDisplay.htm这样的请求，使用defaultHandler这个方法去处理。而在defaultHandler中，又调用了逻辑服务层的
dummyService.getDummyList()方法获得人员列表，最后把列表存放到一个ModelMap中去(可以先理解为Map的一种数据结构)。
同样地，在paul.sydney.controller包中，新建一个类PersonForm，并将代码修改如下：
1package paul.sydney.controller;
2
3import org.springframework.beans.factory.annotation.Autowired;
4import org.springframework.stereotype.Controller;
5import org.springframework.ui.ModelMap;
6import org.springframework.validation.BindingResult;
7import org.springframework.web.bind.annotation.ModelAttribute;
8import org.springframework.web.bind.annotation.RequestMapping;
9import org.springframework.web.bind.annotation.RequestMethod;
10import org.springframework.web.bind.annotation.RequestParam;
11import org.springframework.web.bind.annotation.SessionAttributes;
12import org.springframework.web.bind.support.SessionStatus;
13
14import paul.sydney.model.Person;
15import paul.sydney.service.DummyService;
16@Controller
17@RequestMapping("/personForm.htm")
18@SessionAttributes("person")
19public class PersonForm {
20
21 private final DummyService dummyService;
22
23 @Autowired
24 public PersonForm(DummyService dummyService) {
25 this.dummyService = dummyService;
26 }
27
28 @RequestMapping(method = RequestMethod.GET)
29 public String setupForm(@RequestParam("personId") int id, ModelMap model) {
30 Person person = this.dummyService.retrievePerson(id);
31 model.addAttribute("person", person);
32 return "personForm";
33 }
34
35 @RequestMapping(method = RequestMethod.POST)
36 public String processSubmit(@ModelAttribute("person") Person person, BindingResult result, SessionStatus status) {
37 this.dummyService.savePerson(person);
38 status.setComplete();
39 return "redirect:personDisplay.htm";
40 }
41}
package paul.sydney.controller; 2
3
import org.springframework.beans.factory.annotation.Autowired; 4
import org.springframework.stereotype.Controller; 5
import org.springframework.ui.ModelMap; 6
import org.springframework.validation.BindingResult; 7
import org.springframework.web.bind.annotation.ModelAttribute; 8
import org.springframework.web.bind.annotation.RequestMapping; 9
import org.springframework.web.bind.annotation.RequestMethod; 10
import org.springframework.web.bind.annotation.RequestParam; 11
import org.springframework.web.bind.annotation.SessionAttributes; 12
import org.springframework.web.bind.support.SessionStatus; 13
14
import paul.sydney.model.Person; 15
import paul.sydney.service.DummyService; 16
@Controller17
@RequestMapping("/personForm.htm") 18
@SessionAttributes("person") 19
public class PersonForm { 20
21
private final DummyService dummyService; 22
23
@Autowired24
public PersonForm(DummyService dummyService) { 25
this.dummyService = dummyService; 26
} 27
28
@RequestMapping(method = RequestMethod.GET) 29
public String setupForm(@RequestParam("personId") int id, ModelMap model) { 30
Person person = this.dummyService.retrievePerson(id); 31
model.addAttribute("person", person); 32
return "personForm"; 33
} 34
35
@RequestMapping(method = RequestMethod.POST) 36
public String processSubmit(@ModelAttribute("person") Person person, BindingResult result, SessionStatus status) { 37
this.dummyService.savePerson(person); 38
status.setComplete(); 39
return "redirect:personDisplay.htm"; 40
} 41
}
这里，首先通过依赖注入，注入了服务层逻辑dummyService，然后在setupForm中，根据传入的参数personId，通过服务层逻辑dummyService找出这个人，然后将其保存到一个Model中去，返回给视图层personForm.jsp显示;而processSubmit是调用服务层逻辑保存用户的资料(通过this.dummyService.savePerson(person)实现),最后使用redirect跳转到personDisplay.htm。
