springMVC注解中@RequestMapping中常用参数value params 以及@RequestParam 详解
2016-10-13 23:24
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package cn.hive.action; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; /** * Created with IntelliJ IDEA. * Author: DAX * Date: 2016/10/13 * 测试action类 * Time: 20:08 */ @Controller @RequestMapping(value = "/{abc}") public class InitAction { /* * @RequestMapping value 和params 的详解 * * * 如类没有定义请求映射 类方法中的value代表根路径 如果在类方法中有点类似于struts中 action的id * params 为请求参数的数组 支持一些简单的表达式 params={"!id","name!=James"} 表示不能带名称为id的参数 而且name的值不能为James 等等表达式 * * @RequestMapping(value = "/init", params = {"id=myValue"}) 只有存在了请求参数id=myValue /init.action?id=myValue 才会被initData处理 * @RequestMapping(value = "/init", params = {"name=kobe", "number=23"}) /init.action?name=kobe&&number=23 否则 404错误 * * 一旦abc init 为占位符即用{}包括起来 该请求默认为下面 * http://localhost:8080/abc/init.action * 如果被赋值 例如 abc = "hello"; init = "world"; 则下面网址也可以访问ininData方法 * http://localhost:8080/hello/world.action * 这形成了具有REST(表现层状态转化)风格的请求形式 表示 abc 的id为 init的实际赋值 但是请求的方法必须为GET * * @RequestParam 详解 接收 请求参数 * required参数默认为false 表示 可以为空 * 如果为 数据的基本类型 一旦没有赋值 提交 会被赋值null * 抛出异常 一般推荐用包装类 来接收 比如 int 用 Integer double 用Double 等 */ @RequestMapping(value = "/{init}") public String initData(@PathVariable("abc") String abc, @PathVariable("init") String init, @RequestParam(value = "name", required = false) String name, @RequestParam(value = "age", required = false) Integer age) { abc = "hello"; init = "world"; System.out.println(name + age); return "test"; } }
测试页面 index.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%-- Created by IntelliJ IDEA. User: Administrator Date: 2016/10/13 Time: 16:34 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <html> <head> <title>Title</title> </head> <body> <form action="<c:url value="/hello/world.action"/>" method="post" > <label> <input type="text" name="name"> <input type="text" name="age"> </label> <input type="submit" value="提交"> </form> <a href="<c:url value="/hello/world.action"/>">test</a> </body> </html>
成功页面
<%-- Created by IntelliJ IDEA. User: felord Date: 2016/10/13 Time: 20:21 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> aaaaaaaaaaaaa ${param.name} ${param.age} bbbbbbbbbbbb ${param.id} </body> </html>
对于 params 已经解释过了 因为 有冲突 没有测试代码 可自行测试
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