SpringMVC中@RequestMapping注解的实现

@RequestMapping("/")
    public String toIndex(){
        return "index";
    }
    
    @RequestMapping("/")
    public String toIndex2(){
        return "index";
    }

@RequestMapping("/hello")
@Controller
public class TestRequestMapping {
    @RequestMapping("/target")
    public String toTarget(){
        return "target";
    }
}

    @RequestMapping({"/test1","/test2"})
    public String toTestValue(){
        return "testValue";
    }

<a th:href="@{/test1}" rel="external nofollow" >一个控制器方法匹配多个value测试1</a><br>
<a th:href="@{/test2}" rel="external nofollow" >一个控制器方法匹配多个value测试2</a><br>

@RequestMapping(value="/test3",method=RequestMethod.POST)
    public String toTestMethod(){
        return "testMethod";
    }

<a th:href="@{/test3}" rel="external nofollow" >method允许POST请求测试</a><br>
<form method="POST" th:action="@{/test3}">
    username<input name="username" type="text" /><br>
    <input type="submit" value="提交" /><br>
</form>
<form method="DELETE" th:action="@{/test3}">
    username<input name="username" type="text" /><br>
    <input type="submit" value="提交" /><br>
</form>

    /*这个注解表示请求参数要满足如下要求
    1.要有username1，值任意
    2.不能有username2
    3.要有username3，且值为jack
    4.要有username4，且值不能为jack
    在写键值对时，如果value为字符串类型，不需要使用单引号括起来，否则会出错
     */
    @RequestMapping(value="/test4",params={"username1","!username2","username3=jack","username4!=jack"})
    public String toTestParams(){
        return "testParams";
    }

<!--使用？可以连接请求参数，但是会标红，所以可以使用括号来表示请求参数-->
<a th:href="@{/test4(username3='jack',username4='asd')}" rel="external nofollow" >Params没有username1测试</a><br>
<a th:href="@{/test4(username1='asd',username2='qw',username3='jack',username4='qew')}" rel="external nofollow" >Params有username2测试</a><br>
<a th:href="@{/test4(username1='dg',username3='asd',username4='oih')}" rel="external nofollow" >Params有username3但值不为jack测试</a><br>
<a th:href="@{/test4(username1='ih',username3='jack',username4='jack')}" rel="external nofollow" >Params有username4但值为jack测试</a><br>
<a th:href="@{/test4(username1='asd',username3='jack',username4='xcv')}" rel="external nofollow" >Params参数满足条件测试</a><br>

    @RequestMapping(value="/test5",headers = {"Host=localhost:8080","Accept-Encoding!=gzip, deflate, br"})
    public String toTestHeaders(){
        return "testHeaders";
    }

<a th:href="@{/test5}" rel="external nofollow" >Headers不满足Accept-Encoding条件</a><br>

    @RequestMapping(value="/test5",headers = {"Host=localhost:8080","Accept-Encoding=gzip, deflate, br"})
    public String toTestHeaders(){
        return "testHeaders";
    }

    //大括号表示占位符
    @RequestMapping("/test6/{id}/{username}")
    public String toTest(@PathVariable("id")Integer id,@PathVariable("username")String username){
        System.out.println("id = "+id+"  "+"username = "+username);
        return "test";
    }