03_处理器方法的参数

zcq

Team.java

package com.kkb.pojo;
import com.fasterxml.jackson.annotation.JsonFormat;
import org.springframework.format.annotation.DateTimeFormat;
import java.util.Date;
/**
 * ClassName: Team
 *
 * @author wanglina
 * @version 1.0
 */
public class Team {
    private Integer teamId;
    private String teamName;
    private String location;
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @JsonFormat(pattern = "yyyy-MM-dd")
    private Date createTime;
    @Override
    public String toString() {
        return "Team{" +
                "teamId=" + teamId +
                ", teamName='" + teamName + '\'' +
                ", location='" + location + '\'' +
                ", createTime=" + createTime +
                '}';
    }
    public Date getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
    public Integer getTeamId() {
        return teamId;
    }
    public void setTeamId(Integer teamId) {
        this.teamId = teamId;
    }
    public String getTeamName() {
        return teamName;
    }
    public void setTeamName(String teamName) {
        this.teamName = teamName;
    }
    public String getLocation() {
        return location;
    }
    public void setLocation(String location) {
        this.location = location;
    }
}

QueryVO.java

package com.kkb.vo;
import com.kkb.pojo.Team;
import java.util.List;
/**
 * ClassName: QueryVO
 *
 * @author wanglina
 * @version 1.0
 */
public class QueryVO {
    private List<Team> teamList;
    public List<Team> getTeamList() {
        return teamList;
    }
    public void setTeamList(List<Team> teamList) {
        this.teamList = teamList;
    }
}

ParamController.java

package com.kkb.controller;
import com.kkb.pojo.Team;
import com.kkb.vo.QueryVO;
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;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
 * ClassName: ParamController
 *
 * @author wanglina
 * @version 1.0
 */
@Controller
@RequestMapping("param")
public class ParamController {
    //8、获取集合类型的参数: 简单类型的可以通过@RequestParam注解实现；对象集合不支持直接获取，必须封装在类中，作为一个属性操作
    @RequestMapping("test08")
    public ModelAndView test08(@RequestParam("teamName") List<String> nameList){
        System.out.println("test08-----------------");
        for (String s : nameList) {
            System.out.println(s);
        }
        return new ModelAndView("ok");
    }
    @RequestMapping("test09")
    public ModelAndView test09(QueryVO vo){
        System.out.println("test09-----------------");
        for (Team team : vo.getTeamList()) {
            System.out.println(team);
        }
        return new ModelAndView("ok");
    }
    //7、获取数组类型的参数
    @RequestMapping("test07")
    public ModelAndView test07(String[] teamName,HttpServletRequest request){
        System.out.println("test07-----------------");
        //方式1：
        for (String s : teamName) {
            System.out.println(s);
        }
        System.out.println("---------------");
        //方式2：
        String[] teamNames = request.getParameterValues("teamName");
        for (String name : teamNames) {
            System.out.println(name);
        }
        return new ModelAndView("ok");
    }
    //6、获取日期类型的参数:实体类中的对应的属性上必须有注解 @DateTimeFormat(pattern = "yyyy-MM-dd")
    @RequestMapping("test06")
    public ModelAndView test06(Team team){
        System.out.println("test06-----------------");
        System.out.println(team);
        return new ModelAndView("ok");
    }
    //5、直接使用URL地址传参: 借助@PathVariable 注解
    // 例如http://localhost:8080/param/test05/1001/lacker/las
    @RequestMapping("test05/{id}/{name}/{loc}")
    public ModelAndView test05(@PathVariable("id") Integer teamId,
                               @PathVariable("name") String teamName,
                               @PathVariable("loc") String teamLocation){
        System.out.println("test05-----------------");
        System.out.println(teamId);
        System.out.println(teamName);
        System.out.println(teamLocation);
        return new ModelAndView("ok");
    }
    //4、使用HttpServletRequest 对象获取参数：跟原来的javaWeb项目中使用的方式是一样的
    @RequestMapping("test04")
    public ModelAndView test04(HttpServletRequest request){
        System.out.println("test04-----------------");
        String teamId = request.getParameter("teamId");
        String teamName = request.getParameter("teamName");
        String location = request.getParameter("location");
        if(teamId!=null)
            System.out.println(Integer.valueOf(teamId));
        System.out.println(teamName);
        System.out.println(location);
        return new ModelAndView("ok");
    }
    //3、请求参数和方法名称的参数不一致:使用@RequestParam进行矫正，
    // value属性表示请求中的参数名称
    // required属性表示参数是否是必须的：true:必须赋值，否则报出400错；false：可以不赋值，结果就是null
    @RequestMapping("test03")
    public ModelAndView test03(@RequestParam(value = "teamId",required = false) Integer id,
                               @RequestParam(value = "teamName",required = true) String name,
                               @RequestParam("location") String loc){
        System.out.println("test03-----------------");
        System.out.println(id);
        System.out.println(name);
        System.out.println(loc);
        return new ModelAndView("ok");
    }
    //2、使用对象接收多个参数：要求用户请求中携带的参数名称必须是实体类中的属性保持一致，否则就获取不到
    @RequestMapping("test02")
    public ModelAndView test02(Team team){
        System.out.println("test02-----------------");
        System.out.println(team);
        return new ModelAndView("ok");
    }
    /**
     * 1、直接使用方法的参数逐个接收:方法的参数名称必须与用户请求中携带的参数名称保持一致，否则就获取不到
     * 好处：不需要类型转换
     */
    @RequestMapping("test01")
    public ModelAndView test01(Integer teamId,String teamName,String teamLocation){
        System.out.println("test01-----------------");
        System.out.println(teamId);
        System.out.println(teamName);
        System.out.println(teamLocation);
        return new ModelAndView("ok");
    }
    @RequestMapping("hello")
    public  ModelAndView hello(){
        return new ModelAndView("hello");
    }
}

hello.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>hello</title>
</head>
<body>
    <h3>8、获取集合类型的参数</h3>
    <form action="/param/test08" method="post">
        球队名称1：<input type="text" name="teamName"/><br/>
        球队名称2：<input type="text" name="teamName"/><br/>
        球队名称3：<input type="text" name="teamName"/><br/>
        <button type="submit">提交</button>
    </form>
    <form action="/param/test09" method="post">
        球队id1：<input type="text" name="teamList[0].teamId"/><br/>
        球队id2：<input type="text" name="teamList[1].teamId"/><br/>
        球队id3：<input type="text" name="teamList[2].teamId"/><br/>
        球队名称1：<input type="text" name="teamList[0].teamName"/><br/>
        球队名称2：<input type="text" name="teamList[1].teamName"/><br/>
        球队名称3：<input type="text" name="teamList[2].teamName"/><br/>
        <button type="submit">提交</button>
    </form>
    <h3>7、获取数组类型的参数</h3>
    <form action="/param/test07" method="post">
        球队名称1：<input type="text" name="teamName"/><br/>
        球队名称2：<input type="text" name="teamName"/><br/>
        球队名称3：<input type="text" name="teamName"/><br/>
        <button type="submit">提交</button>
    </form>
    <h3>6、获取日期类型的参数</h3>
    <form action="/param/test06" method="post">
        球队id：<input type="text" name="teamId"/><br/>
        球队名称：<input type="text" name="teamName"/><br/>
        球队位置：<input type="text" name="location"/><br/>
        创建日期：<input type="text" name="createTime"/><br/>
        <button type="submit">提交</button>
    </form>
    <h3>5、直接使用URL地址传参</h3>
    <h3>4、使用HttpServletRequest 对象获取参数</h3>
    <form action="/param/test04" method="post">
        球队id：<input type="text" name="teamId"/><br/>
        球队名称：<input type="text" name="teamName"/><br/>
        球队位置：<input type="text" name="location"/><br/>
        <button type="submit">提交</button>
    </form>
    <h3>3、请求参数和方法名称的参数不一致</h3>
    <form action="/param/test03" method="post">
        球队id：<input type="text" name="teamId"/><br/>
        球队名称：<input type="text" name="teamName"/><br/>
        球队位置：<input type="text" name="location"/><br/>
        <button type="submit">提交</button>
    </form>
    <h3>2、使用对象接收多个参数</h3>
    <form action="/param/test02" method="post">
        球队id：<input type="text" name="teamId"/><br/>
        球队名称：<input type="text" name="teamName"/><br/>
        球队位置：<input type="text" name="location"/><br/>
        <button type="submit">提交</button>
    </form>
    <h3>1、直接使用方法的参数逐个接收</h3>
    <form action="/param/test01" method="post">
        球队id：<input type="text" name="teamId"/><br/>
        球队名称：<input type="text" name="teamName"/><br/>
        球队位置：<input type="text" name="teamLocation"/><br/>
        <button type="submit">提交</button>
    </form>
</body>
</html>