/**
* @RequestParam 注解用于映射请求参数
* value 用于映射请求参数名称
* required 用于设置请求参数是否必须的
* defaultValue 设置默认值,当没有传递参数时使用该值
*/
@RequestMapping(value="/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";
}
<!--测试 请求参数 @RequestParam 注解使用 -->
<a href="springmvc/testRequestParam?username=atguigu&age=10">testRequestParam</a>
//了解: 映射请求头信息 用法同 @RequestParam
@RequestMapping(value="/testRequestHeader")
public String testRequestHeader(@RequestHeader(value="Accept-Language") String al){
System.out.println("testRequestHeader - Accept-Language:"+al);
return "success";
}
<!-- 测试 请求头@RequestHeader 注解使用 -->
<a href="springmvc/testRequestHeader">testRequestHeader</a>
//了解:@CookieValue: 映射一个 Cookie 值. 属性同 @RequestParam
@RequestMapping("/testCookieValue")
public String testCookieValue(@CookieValue("JSESSIONID") String sessionId) {
System.out.println("testCookieValue: sessionId: " + sessionId);
return "success";
}
<!--测试 请求Cookie @CookieValue 注解使用 -->
<a href="springmvc/testCookieValue">testCookieValue</a>
/**
* Spring MVC 会按请求参数名和 POJO 属性名进行自动匹配, 自动为该对象填充属性值。
* 支持级联属性
* 如:dept.deptId、dept.address.tel 等
*/
@RequestMapping("/testPOJO")
public String testPojo(User user) {
System.out.println("testPojo: " + user);
return "success";
}
<!-- 测试 POJO 对象传参,支持级联属性 -->
<form action=" testPOJO" method="POST">
username: <input type="text" name="username"/><br>
password: <input type="password" name="password"/><br>
email: <input type="text" name="email"/><br>
age: <input type="text" name="age"/><br>
city: <input type="text" name="address.city"/><br>
province: <input type="text" name="address.province"/>
<input type="submit" value="Submit"/>
</form>
package com.atguigu.springmvc.entities;
public class Address {
private String province;
private String city;
//get/set
}
package com.atguigu.springmvc.entities;
public class User {
private Integer id ;
private String username;
private String password;
private String email;
private int age;
private Address address;
//get/set
}
<!-- 配置字符集 -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
@Override
protected Object resolveStandardArgument(Class<?> parameterType, NativeWebRequest webRequest) throws Exception {
HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
if (ServletRequest.class.isAssignableFrom(parameterType) ||
MultipartRequest.class.isAssignableFrom(parameterType)) {
Object nativeRequest = webRequest.getNativeRequest(parameterType);
if (nativeRequest == null) {
throw new IllegalStateException(
"Current request is not of type [" + parameterType.getName() + "]: " + request);
}
return nativeRequest;
} else if (ServletResponse.class.isAssignableFrom(parameterType)) {
this.responseArgumentUsed = true;
Object nativeResponse = webRequest.getNativeResponse(parameterType);
if (nativeResponse == null) {
throw new IllegalStateException(
"Current response is not of type [" + parameterType.getName() + "]: " + response);
}
return nativeResponse;
} else if (HttpSession.class.isAssignableFrom(parameterType)) {
return request.getSession();
} else if (Principal.class.isAssignableFrom(parameterType)) {
return request.getUserPrincipal();
} else if (Locale.class.equals(parameterType)) {
return RequestContextUtils.getLocale(request);
} else if (InputStream.class.isAssignableFrom(parameterType)) {
return request.getInputStream();
} else if (Reader.class.isAssignableFrom(parameterType)) {
return request.getReader();
} else if (OutputStream.class.isAssignableFrom(parameterType)) {
this.responseArgumentUsed = true;
eturn response.getOutputStream();
} else if (Writer.class.isAssignableFrom(parameterType)) {
this.responseArgumentUsed = true;
return response.getWriter();
}
return super.resolveStandardArgument(parameterType, webRequest);
}
/**
* 可以使用 Serlvet 原生的 API 作为目标方法的参数 具体支持以下类型
*
* HttpServletRequest
* HttpServletResponse
* HttpSession
* java.security.Principal
* Locale InputStream
* OutputStream
* Reader
* Writer
* @throws IOException
*/
@RequestMapping("/testServletAPI")
public void testServletAPI(HttpServletRequest request,HttpServletResponse response, Writer out) throws IOException {
System.out.println("testServletAPI, " + request + ", " + response);
out.write("hello springmvc");
//return "success";
}
<!-- 测试 Servlet API 作为处理请求参数 -->
<a href="springmvc/testServletAPI">testServletAPI</a>