SpringMVC @RequestMapping注解详解

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping {
    String name() default "";
    @AliasFor("path")
    String[] value() default {};
    @AliasFor("value")
    String[] path() default {};
    RequestMethod[] method() default {};
    String[] params() default {};
    String[] headers() default {};
    String[] consumes() default {};
    String[] produces() default {};
}

@Controller
@RequestMapping("/hello")
public class DisplayController {
    @RequestMapping("/displayTest")
    //此时的请求实际就是/hello/displayTest
    public String displayTest(){
        return "display";
    }
}

<!--浏览器解析的是绝对路径，会将"/"解析为"localhost:8080/"-->
<a th:href="@{/hello/displayTest}" rel="external nofollow" >访问display页面...</a>

//表示可以通过地址testWorld或者hello/testWorld都可以访问world.html
//@RequestMapping请求地址与方法名没有关系，但是为了方便习惯上使用方法名
@RequestMapping(value = {"testWorld","hello/testWorld"})
public String testWorld(){
    return "world";
}

<!--浏览器解析的是绝对路径，会将"/"解析为"localhost:8080/"-->
<a th:href="@{/hello/testWorld}" rel="external nofollow" >@{/hello/testWorld}访问helloworld页面...</a><br>
<a th:href="@{/testWorld}" rel="external nofollow"  rel="external nofollow" >@{/testWorld}访问helloworld页面...</a><br>

//表示可以通过地址testWorld或者hello/testWorld都可以访问world.html
@RequestMapping(value = {"testWorld","hello/testWorld"},method = {RequestMethod.GET,RequestMethod.POST})
public String testWorld(){
    return "world";
}

<!--浏览器解析的是绝对路径，会将"/"解析为"localhost:8080/"-->
<a th:href="@{/testWorld}" rel="external nofollow"  rel="external nofollow" >@{/testWorld}访问helloworld页面（GET请求（默认））</a><br>
<form th:action="@{/testWorld}" method="post">
    <input type="submit" value="@{/testWorld}访问helloworld页面（POST请求）">
</form>

//处理请求的参数只能是username和password，且username=admin、password=12345678
@RequestMapping(value = "/testParams",params = {"username=admin","password=12345678"})
public String testParams(){
    return "world";
}

<!--浏览器解析的是绝对路径，会将"/"解析为"localhost:8080/"-->
<!--此处使用单引号，双引号会报错-->
<!--会自动转化为?传参-->
<a th:href="@{/testParams(username='admin',password=12345678)}" rel="external nofollow"  rel="external nofollow" >测试params参数</a><br>

<a th:href="@{/testParams(username='root',password=12345678)}" rel="external nofollow" >测试params参数root</a><br>

//此时的请求的params中username=admin，password=1234545678,并且端口号是8081才可以成功，否则报错
@RequestMapping(value = "/testParams",
        params = {"username=admin","password=12345678"},
        headers = {"host=localhost:8081"})
public String testParams(){
    return "world";
}

<a th:href="@{/testParams(username='admin',password=12345678)}" rel="external nofollow"  rel="external nofollow" >测试params参数</a><br>

//此时的请求的params中username=admin，password=1234545678,并且端口号是8080才可以成功，否则报错
@RequestMapping(value = "/testParams",
        params = {"username=admin","password=12345678"},
        headers = {"host=localhost:8080"})
public String testParams(){
    return "world";
}

//@RequestMapping(value = "/a?a/testAnt")
//@RequestMapping(value = "/a*a/testAnt")
@RequestMapping(value = "testAnt")
public String testAnt(){
    return "world";
}

<a th:href="@{/a1a/testAnt}" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >测试ant风格--->?</a><br>
<a th:href="@{/a1a/testAnt}" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >测试ant风格--->*</a><br>
<a th:href="@{/a1a/testAnt}" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >测试ant风格--->**</a><br>

@RequestMapping("/testRest/{username}/{password}")
public String testRest(@PathVariable("username") String username,@PathVariable("password") String password){
    System.out.println("username="+username);
    System.out.println("password="+password);
    return "world";
}

<!--浏览器解析的是绝对路径，会将"/"解析为"localhost:8080/"-->
<a th:href="@{/testRest/小王/123456}" rel="external nofollow" >测试rest占位符</a><br>

@GetMapping("testGetMapping")
public String testGetMapping(){
    return "world";
}

<!--浏览器解析的是绝对路径，会将"/"解析为"localhost:8080/"-->
<a th:href="@{/testGetMapping}" rel="external nofollow" >@{/testGetMapping}访问helloworld页面...</a><br>

//当前请求映射的请求地址是testPut，请求方式是put方式
@RequestMapping(value = "/testPut",method = RequestMethod.PUT)
public String testPut(){
    return "world";
}

<!--测试form表单是否支持put或delete方式的请求-->
<form th:action="@{/testPut}" method="put">
    <input type="submit" value="测试form表单是否支持put或delete方式的请求">
</form>