SpringMVC中RequestMapping注解(作用、出现的位置、属性)

@Controller
@RequestMapping(path = "/user") //第一级的访问目录
public class HelloController {

 @RequestMapping(path = "/hello") //第二级的访问目录
 public String sayHello(){
 System.out.println("Hello SpringMVC");
 return "success";
 }

 @RequestMapping(value = "/testRequestmapping") //第二级的访问目录
 public String testRequestmapping(){
 System.out.println("测试注解");
 return "success";
 }
}

<!-- 第一种访问方式 --> 
<a href="${pageContext.request.contextPath}/user/hello">sayHello</a> <br/>
<!-- 第二种访问方式 --> 
<a href="user/testRequestmapping">测试注解</a>

@RequestMapping(value="/saveAccount",method=RequestMethod.POST)
public String saveAccount() {
	System.out.println("保存了账户");
	return "success"; 
}

<!-- 请求方式的示例 --> 
<a href="account/saveAccount">保存账户，get 请求</a> <br/>
<form action="account/saveAccount" method="post"> 
	<input type="submit" value="保存账户，post 请求">
</form>

@RequestMapping(value="/removeAccount",params= {"accountName","money>100"})
public String removeAccount() {
	System.out.println("删除了账户");
	return "success"; 
}

<!-- 请求参数的示例 --> 
<a href="account/removeAccount?accountName=aaa&money>100">删除账户，金额 100</a> <br/>
<a href="account/removeAccount?accountName=aaa&money>150">删除账户，金额 150</a>

@Controller
@RequestMapping(path = "/user")
public class HelloController {

 @RequestMapping(value = "/testRequestmapping",method = {RequestMethod.GET},params = {"username=keafmd"},headers = {"Accept"})
 public String testRequestmapping(){
  System.out.println("测试注解");
  return "success";
 }
}

<a href="user/testRequestmapping?username=keafmd">RequestMapping注解</a>