1 修饰类和方法
2 value
3 method
4 params和headers
5 Ant路径
5 @PathVariable
6 HiddenHttpMethodFilter
7 @RequestParam
8 @RequestHeader
9 @CookieValue
总结
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 {
/**
* 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";
}
}
2 value
@RequestMapping("/springmvc")
可以改为@RequestMapping(value = "springmvc")
post请求
controller
/**
* 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";
}
jsp
<form action="/springmvc/testMethod" method="post">
<input type="submit" value="submit">
</form>
4 params和headers
/**
* 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>
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 /**
* 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>
5 @PathVariable
/**
* @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>
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>/*</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>
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
/**
* @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>
8 @RequestHeader
/**
* 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>
9 @CookieValue
@RequestMapping("/testCookieValue")
public String testCookieValue(@CookieValue(value = "JSESSIONID") String sessionId) {
System.out.println("testCookieValue:" + sessionId);
return "success";
}
总结
到此这篇关于SpringMVC中@RequestMapping注解用法的文章就介绍到这了,更多相关SpringMVC @RequestMapping用法内容请搜索易知道(ezd.cc)以前的文章或继续浏览下面的相关文章希望大家以后多多支持易知道(ezd.cc)!