Spring MVC参数传递 | 参数传递

参数传递
配置Spring MVC的编码过滤器

<filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!--初始化参数-->
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <!--强制使用UTF-8编码-->
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

接收零散参数:装配原则为传递参数名和方法接收参数名一致

model代表给页面传递的数据

 public String formRequest( String userCoder, String userPwd, Model model){
        System.out.println(userCoder+"\t"+userPwd);
        model.addAttribute("userCode",userCoder);
        return "welcome";
    }

jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登陆</title>
</head>
<body>
    <form action="/fourth/fourthRequest" method="post">
        编号：<input type="text" name="user_id"/>
        名字：<input type="password" name="user_name"/>
        <input type="submit" value="登陆"/>
    </form>
</body>
</html>

手动装配@RequestParam  name代表页面发送的参数名字  required代表参数是否必须传递  false代表可以不传递，默认为true defaultValue代表默认

@Controller
@RequestMapping(value = "/fourth")
public class FourthController {
    @RequestMapping(value = "/formRequest")
    /**
     * 接收零散参数:装配原则为传递参数名和方法接收参数名一致
     * 手动装配@RequestParam  name代表页面发送的参数名字  required代表参数是否必须传递  false代表可以不传递，默认为true defaultValue代表默认
     * model代表给页面传递的数据
     */
    public String formRequest(@RequestParam(name = "userCode",required = false,defaultValue = "王洪涛") String userCoder, @RequestParam(name = "userPwd",required = false)String userPwd, Model model){
        System.out.println(userCoder+"\t"+userPwd);
        model.addAttribute("userCode",userCoder);
        return "welcome";
    }

域属性自动装配

/**
     * 注入域属性
     * @return
     */
    private List<Teacher> teaList;
    private Teacher teacher;

对象自动装配

/**
     * 对象参数：传递的对象参数和对象中的属性名保持一致
     * 域属性传递：传递参数为：域属性.属性名
     * 集合参数传递：集合名[下标].属性名
     */
    @RequestMapping(value = "/fourthRequest")
    public String fourthRequest(UserInfo info){
        System.out.println(info.toString());

        return "welcome";
    }

集合自动装配

teacher1:<input type="text" name="teaList[0].teacher_name"/>
teacher2:<input type="text" name="teaList[1].teacher_name"/>

RESTFUL风格的参数传递

 /**
     * get请求时，如果需要传递数据，那么则不能使用以往方式？name=xxx&age=yy，但是现在要遵循restful风格，举例    xxx/yyy/zzz
     * 根据地址栏URL匹配拿值  使用@PathVariable(name=地址栏中的参数映射)
     * @param name
     * @param age
     * @return
     */
    @RequestMapping(value = "/restfulRequest/{b}/{d}")
    public String restfulRequest(@PathVariable(name = "b") String name,@PathVariable(name = "d") String age){
        System.out.println(name+"\t"+age);
        return "welcome";
    }