SpringMVC入门（一）--d.参数封装

迷南。 2022-05-25 23:55 143阅读 0赞

## 这里示例包括参数封装有：int类型，String类型，对象类型，包装类型，数组类型，list集合类型，map集合类型。 ##

## 1.创建实体类User ##

package com.zit.entity;
    
    import java.util.Date;
    
    public class User {
    	private int id;
    	private String username;
    	private String age;
    	private String phone;
    	private String address;
    	private Date birthday;
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getAge() {
    		return age;
    	}
    	public void setAge(String age) {
    		this.age = age;
    	}
    	public String getPhone() {
    		return phone;
    	}
    	public void setPhone(String phone) {
    		this.phone = phone;
    	}
    	public String getAddress() {
    		return address;
    	}
    	public void setAddress(String address) {
    		this.address = address;
    	}
    	public Date getBirthday() {
    		return birthday;
    	}
    	public void setBirthday(Date birthday) {
    		this.birthday = birthday;
    	}
    	
    	
    
    }

## 2.创建包装类 ##

package com.zit.entity;
    
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    public class WrapObject {
    	private User user;
    	
    	private List<User> userList;
    
    	private Map<String, String> map = new HashMap<String, String>();
    
    	public User getUser() {
    		return user;
    	}
    
    	public void setUser(User user) {
    		this.user = user;
    	}
    
    	public List<User> getUserList() {
    		return userList;
    	}
    
    	public void setUserList(List<User> userList) {
    		this.userList = userList;
    	}
    
    	public Map<String, String> getMap() {
    		return map;
    	}
    
    	public void setMap(Map<String, String> map) {
    		this.map = map;
    	}
    	
    	
    
    }

3.编写jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    
    <form action="${pageContext.request.contextPath}/login.do" method="post">
    	姓名：<input type="text" name="username">
    	年龄：<input type="text" name="age">
    	手机：<input type="text" name="phone">
    	地址：<input type="text" name="address">
    	生日：<input type="text" name="birthday">
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/intParam.do" method="post">
    	id：<input type="text" name="id">
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/strParam.do" method="post">
    	姓名：<input type="text" name="username">
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/strParam.do" method="post">
    	姓名：<input type="text" name="username">
    	年龄：<input type="text" name="age">
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/arrParam.do" method="post">
    	姓名：<input type="checkbox" name="arr" value="1">
    	年龄：<input type="checkbox" name="arr" value="2">
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/listParam.do" method="post">
    	姓名：<input type="text" name="userList[0].username">
    	年龄：<input type="text" name="userList[0].age" >
    	姓名：<input type="text" name="userList[1].username">
    	年龄：<input type="text" name="userList[1].age" >
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/wrapParam.do" method="post">
    	姓名：<input type="text" name="user.username">
    	年龄：<input type="text" name="user.age" >
    	<input type="submit" value="提交">
    </form>
    <hr >
    
    <form action="${pageContext.request.contextPath}/mapParam.do" method="post">
    	姓名：<input type="text" name="map['username']">
    	年龄：<input type="text" name="map['age']" >
    	<input type="submit" value="提交">
    </form>
    <hr >
    </body>
    </html>

## 4.创建执行类 ##

package com.zit.controller;
    
    import java.util.List;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import com.zit.entity.User;
    import com.zit.entity.WrapObject;
    
    @Controller
    public class UserController {
    	/**
    	 * 封装基本数据类型参数
    	 * @param id
    	 * @return
    	 */
    	@RequestMapping("intParam")
    	public String intParam(int id){
    		System.out.println(id);
    		return "success";
    	}
    	/**
    	 * 封装String类型参数
    	 * @param username
    	 * @return
    	 */
    	@RequestMapping("strParam")
    	public String strParam(String username){
    		System.out.println(username);
    		return "success";
    	}
    	/**
    	 * 封装对象
    	 * @param user
    	 * @return
    	 */
    	@RequestMapping("login")
    	public String strParam(User user){
    		System.out.println(user.getAddress());
    		return "success";
    	}
    	/**
    	 * 封装数组
    	 * @param user
    	 * @return
    	 */
    	@RequestMapping("arrParam")
    	public String arrParam(String[] arr){
    		System.out.println(arr.length);
    		return "success";
    	}
    	/**
    	 * 封装list集合
    	 * @param obj
    	 * @return
    	 */
    	@RequestMapping("listParam")
    	public String arrParam(WrapObject obj){
    		System.out.println(obj.getUserList().size());
    		return "success";
    	}
    	/**
    	 * 封装包装类
    	 * @param obj
    	 * @return
    	 */
    	@RequestMapping("wrapParam")
    	public String wrapParam(WrapObject obj){
    		System.out.println(obj.getUser().getAge());
    		return "success";
    	}
    	/**
    	 * 封装map集合
    	 * @param obj
    	 * @return
    	 */
    	@RequestMapping("mapParam")
    	public String mapParam(WrapObject obj){
    		System.out.println(obj.getMap().get("username"));
    		return "success";
    	}
    	
    }