SpringMVC中@RequestMapping注解用法实例

package site.exciter.springmvc.handlers;

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

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

    /**
     * 1. @RequestMapping 除了修饰方法, 还可来修饰类 
     * 2. 
     * 1). 类定义处: 提供初步的请求映射信息。相对于 WEB 应用的根目录
     * 2). 方法处: 提供进一步的细分映射信息。 相对于类定义处的 URL。若类定义处未标注 @RequestMapping，则方法处标记的 URL
     * 相对于 WEB 应用的根目录
     */
    @RequestMapping("/testRequestMapping")
    public String testRequestMapping() {
        System.out.println("testRequestMapping");
        return "success";
    }
}

/**
* method比较常用，用来指定请求方式
* @return
*/ 
@RequestMapping(value = "testMethod", method = RequestMethod.POST)
    public String testMethod() {
        System.out.println("testMethod");
        return "success";
    }

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

/**
     * 可以使用 params 和 headers 来更加精确的映射请求. params 和 headers 支持简单的表达式.
     *
     * @return
     */
    @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>

 /**
     * 通配符 Ant风格，*可以是任何内容
     *
     * @return
     */
    @RequestMapping("/testAntPath/*/exciter")
    public String testAndPath() {
        System.out.println("testAndPath");
        return "success";
    }

<a href="/springmvc/testAntPath/ww/exciter" rel="external nofollow" >testAntPath</a>

    /**
     * @PathVariable 可以来映射 URL 中的占位符到目标方法的参数中
     */
    @RequestMapping("/testPathVariable/{id}")
    public String testPathVariable(@PathVariable("id") Integer id) {
        System.out.println("testPathVariable:"   id);
        return "success";
    }

<a href="/springmvc/testPathVariable/1" rel="external nofollow" >testPathVariable</a>

<!--  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>/*</url-pattern>
    </filter-mapping>

@RequestMapping(value = "/testRest/{id}", method = RequestMethod.GET)
    public String testRestGet(@PathVariable("id") Integer id) {
        System.out.println("testRestGet:"   id);
        return "success";
    }

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

    @RequestMapping(value = "/testRest/{id}", method = RequestMethod.PUT)
    public String testRestPut(@PathVariable Integer id) {
        System.out.println("testRestPut:"   id);
        return "success";
    }

    /**
     * Rest 风格的 URL. 以 CRUD 为例: 新增: /order POST 修改: /order/1 PUT update?id=1 获取:
     * /order/1 GET get?id=1 删除: /order/1 DELETE delete?id=1
     * <p>
     * 如何发送 PUT 请求和 DELETE 请求呢 ? 1. 需要配置 HiddenHttpMethodFilter 2. 需要发送 POST 请求
     * 3. 需要在发送 POST 请求时携带一个 name="_method" 的隐藏域, 值为 DELETE 或 PUT
     * <p>
     * 在 SpringMVC 的目标方法中如何得到 id 呢? 使用 @PathVariable 注解
     */
    @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>

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

/**
     * @RequestParam 来映射请求参数
     * value 值即请求参数的参数名
     * required 该参数是否必须. 默认为 true
     * defaultValue 请求参数的默认值
     */
    @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>

/**
     * 映射请求头信息 用法同 @RequestParam
     */
@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>

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