SpringMVC中@RequestMapping注解用法实例

2022-11-13 10:11:36 注解实例用法

1 修饰类和方法

package site.exciter.springMVC.handlers;

import org.springframework.stereotype.Controller;
import org.springframework.WEB.bind.annotation.RequestMapping;

@RequestMapping("/springmvc")
@Controller
public class SpringMVCTest {

    
    @RequestMapping("/testRequestMapping")
    public String testRequestMapping() {
        System.out.println("testRequestMapping");
        return "success";
    }
}

2 value

@RequestMapping("/springmvc")可以改为@RequestMapping(value = "springmvc")

3 method

post请求

controller

 
@RequestMapping(value = "testMethod", method = RequestMethod.POST)
    public String testMethod() {
        System.out.println("testMethod");
        return "success";
    }

jsp

<fORM action="/springmvc/testMethod" method="post">
    <input type="submit" value="submit">
</form>

4 params和headers


    @RequestMapping(value = "testPramsAndHeaders",
            params = {"username", "age!=10"}, headers = {})
    public String testPramsAndHeaders() {
        System.out.println("testPramsAndHeaders");
        return "success";
    }

<a href="/springmvc/testPramsAndHeaders?username=exciter&age=10" rel="external nofollow" >testPramsAndHeaders</a>

当age=10时，访问会出错；当age为其他值时，正常访问。

http://localhost:8080/springmvc/testPramsAndHeaders?username=exciter&age=10

5 Ant路径

 
    @RequestMapping("/testAntPath
    @RequestMapping("/testPathVariable/{id}")
    public String testPathVariable(@PathVariable("id") Integer id) {
        System.out.println("testPathVariable:" + id);
        return "success";
    }

&lt;a href="/springmvc/testPathVariable/1" rel="external nofollow" &gt;testPathVariable&lt;/a&gt;

6 HiddenHttpMethodFilter

HiddenHttpMethodFilter：浏览器 form 表单只支持 GET、POST、HEAD 请求，而DELETE、PUT 等 method 并不支持，Spring3.0 添加了一个过滤器，可以将这些请求转换为标准的 http 方法，使得支持 GET、POST、PUT 与DELETE 请求。

web.xml中配置HiddenHttpMethodFilter

<!--  配置org.springframework.web.filter.HiddenHttpMethodFilter,可以把 POST 请求转为 DELETE 或 PUT 请求   -->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>
    @RequestMapping(value = "/testRest/{id}", method = RequestMethod.DELETE)
    public String testRestDelete(@PathVariable Integer id) {
        System.out.println("testRestDelete:" + id);
        return "success";
    }

<a href="/springmvc/testRest/1" rel="external nofollow" >
    <button>TestRest GET</button>
</a>
<form action="/springmvc/testRest" method="post">
    <input type="submit" value="TestRest POST">
</form>
<form action="/springmvc/testRest/1" method="post">
    <input type="hidden" name="_method" value="PUT">
    <input type="submit" value="TestRest PUT">
</form>
<form action="/springmvc/testRest/1" method="post">
    <input type="hidden" name="_method" value="DELETE">
    <input type="submit" value="TestRest DELETE">
</form>

注意： 在Tomcat8.0以上请求完接口之后返回页会报错：

HTTP状态 405 - 方法不允许
类型状态报告

消息 JSP 只允许 GET、POST 或 HEAD。Jasper 还允许 OPTIONS

描述请求行中接收的方法由源服务器知道，但目标资源不支持

临时解决方案：在返回的jsp中添加isErrorPage="true"：

<%@ page contentType="text/html;charset=UTF-8" language="java" isErrorPage="true" %>

7 @RequestParam


    @RequestMapping("/testRequestParam")
    public String testRequestParam(@RequestParam(value = "username") String username,
                                   @RequestParam(value = "age", required = false, defaultValue = "0") int age) {
        System.out.println("testRequestParam: username=" + username + "  age=" + age);
        return "success";
    }

<a href="/springmvc/testRequestParam?username=exciter&age=20" rel="external nofollow"  rel="external nofollow" >testRequestParam</a>

8 @RequestHeader


@RequestMapping("/testRequestHeader")
    public String testRequestHeader(@RequestHeader(value = "Accept-Language") String al) {
        System.out.println("testRequestHeader:" + al);
        return "success";
    }

<a href="/springmvc/testRequestParam?username=exciter&age=20" rel="external nofollow"  rel="external nofollow" >testRequestParam</a>

9 @CookieValue

  @RequestMapping("/testCookieValue")
    public String testCookieValue(@CookieValue(value = "JSESSIONID") String sessionId) {
        System.out.println("testCookieValue:" + sessionId);
        return "success";
    }

总结

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