Spring MVC中沒有參數的@RequestMapping

我想了解我的項目代碼，同時學習Spring MVC。Spring MVC中沒有參數的@RequestMapping

在春季@RequestMapping註釋需要參數。例如，

@RequestMapping(value="/something", method=RequestMethod.POST) 
@RequestMapping(value="/index.html", method=RequestMethod.GET) 
@RequestMapping("/index") 
@RequestMapping(params="command=GETINFO")

我的項目使用註釋，它不使用任何XML進行映射。我有一個以下的控制器結構。

@Controller 
public class RuleStepController { 
    private static final String ATTRIBUTE_BRANCH = "branch"; 
    private static final String ATTRIBUTE_EDIT_FORM = "editForm"; 
................. 
    @Autowired 
    private RuleStepService ruleStepService; 
    @Autowired 
    private PopulationDao populationDao; 

    @RequestMapping 
    public void ruleStepEntForm(Long populationId, ModelMap model) { 
    ..... 
    editForm.setStepEnt(stepDto); 
    } 

@RequestMapping 
    public void ruleStepOrgCount(RuleStepOrgSearchForm searchForm, ModelMap model){ 
     ....... 
model.addAttribute("searchForm", searchForm); 
    } 

@RequestMapping 
    public String ruleStepMgrForm() { 
     logger.debug(String.format("ruleStepMgrForm")); 
     return "forward:/employee/employeeSearchForm.view?relationshipId=0&roleId=0&formId=stepMgr"; 
    }

我想明白會是什麼@RequestMapping意義當它不帶任何參數？

@AutoWired有什麼用？

來源

2014-07-22 Umesh Patil

不帶任何參數是在一個方法中使用，則它使用從GET/POST請求中識別輸入參數的方法的參數。例如。在你的'ruleStepEntForm'方法中，GET/POST中的參數應該被命名爲'populationId' – Pat

有了註解@RequestMapping可以綁定請求參數有幾個辦法：

URI模板模式，使用註釋@PathVariable

@RequestMapping(value="/owners/{ownerId}", method=RequestMethod.GET) 
public String findOwner(@PathVariable String ownerId, Model model) { 
    Owner owner = ownerService.findOwner(ownerId); 
    model.addAttribute("owner", owner); 
    return "displayOwner"; 
}

請求參數和標頭值

@Controller 
@RequestMapping("/owners/{ownerId}") 
public class RelativePathUriTemplateController { 

    @RequestMapping(value = "/pets/{petId}", method = RequestMethod.GET, params = "myParam=myValue") 
    public void findPet(@PathVariable String ownerId, @PathVariable String petId, Model model) { 
     // implementation omitted 
    } 
}

使用@RequestParam

@Controller 
@RequestMapping("/pets") 
@SessionAttributes("pet") 
public class EditPetForm { 

    @RequestMapping(method = RequestMethod.GET) 
    public String setupForm(@RequestParam("petId") int petId, ModelMap model) { 
     Pet pet = this.clinic.loadPet(petId); 
     model.addAttribute("pet", pet); 
     return "petForm"; 
    } 
}

與@RequestBody註釋

@RequestMapping(value = "/something", method = RequestMethod.PUT) 
public void handle(@RequestBody String body, Writer writer) throws IOException { 
    writer.write(body); 
}

自動裝配
映射請求體
Spring Container之前創建了豆ruleStepService。如果你需要在你的類中使用這個bean，你只需要像上面那樣聲明，容器就會把這個bean注入到你的類中。你不需要申報;
```
RuleStepService ruleStepService =new RuleStepService(). 
```
集裝箱會發現bean名稱ruleStepService或豆具有類型RuleStepService（基於配置的策略）
@RequestMapping時