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余姚做网站62752762,网站客户端制作多少钱,湘潭建设厅官方网站,设计一个简单的旅游网站文章目录 传参http 状态码传参方式#xff08;1#xff09;URL请求参数 key 与 方法中的形参名一致#xff08;2#xff09;URL请求参数 key与RequestParam(id) 中的别名一致#xff08;3#xff09; 形参是POJO类#xff0c;URL 参数 key 与pojo类的 set方… 文章目录 传参http 状态码传参方式1URL请求参数 key 与 方法中的形参名一致2URL请求参数 key与RequestParam(id) 中的别名一致3 形参是POJO类URL 参数 key 与pojo类的 set方法一致4参数属于URL一部分作为路径上的变量 ReceiveAddress.java通过反射生成对象并给对象赋值传参 传参 http 状态码 1200 响应成功 2404 资源找不到 - 路径错误URL错了 3405 请求方式没有对应好typeMethod Not Allowed, status405 4400 请求的参数与服务器类型不匹配 5500 服务器后端代码出错了(出现了Exception) JavaBean : 实体类 1无参构造函数2属性有get,set方法 传参方式 1URL请求参数 key 与 方法中的形参名一致 // http://localhost:8080/app/fun1?usernamesmithuserAge20GetMapping(fun1)ResponseBodypublic String fun1(String username,Integer userAge){System.out.println(username);System.out.println(userAge);return fun1;} 2URL请求参数 key与RequestParam(“id”) 中的别名一致 RequestParam URL请求参数 key与RequestParam(“id”) 中的别名一致 // http://localhost:8080/app/fun2?id101username小林telno18943049303
GetMapping(fun2)ResponseBodypublic String fun2(RequestParam(id) Integer addrId,RequestParam(telno)Long receiveUserTelno,RequestParam(username)String receiveUsername){String result addrId: addrId receiveUsername: receiveUsername receiveUserTelno :receiveUserTelno;return result;} 3 形参是POJO类URL 参数 key 与pojo类的 set方法一致 参数是pojo类 要有1构造函数 2get,set URL 参数 key 与pojo类的 set方法一致set方法名去除set单词后首字母小写 底层执行原理 1通过反射创建ReceiveAddress对象 2通过反射调用set方法赋值 GetMapping(fun3)ResponseBodypublic ReceiveAddress fun3(ReceiveAddress address){ // javabean (pojo) 无参构造函数 getsetreturn address;}4参数属于URL一部分作为路径上的变量 参数属于URL一部分作为路径上的变量 //URL : http://localhost:8080/app/receiveAddress/103 GetMapping({addrId}) ResponseBody // 返回json数据public ReceiveAddress getById(PathVariable(addrId) Integer addrId){ return null;}ReceiveAddress.java package com.example.entity;import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableId; import com.baomidou.mybatisplus.annotation.TableName; import java.io.Serializable; import java.time.LocalDateTime;TableName(receive_address) public class ReceiveAddress implements Serializable {private static final long serialVersionUID 1L;TableId(value addr_id, type IdType.AUTO)private Integer addrId;private Long receiveUserTelno;private String username;private Integer custId;/*** 地址的省份/private String addrProvince;/** 地址的城市/private String addrCity;/** 地址的区域/private String addrArea;/** 地址的街道/private String addrStreet;/** 详细地址/private String addrDetail;/** 状态/private Integer status;/** 版本号用于做乐观锁/private Integer version;/** 数据添加的时间/private LocalDateTime createTime;/** 数据修改时间*/private LocalDateTime updateTime;public ReceiveAddress(Integer addrId, Long receiveUserTelno, String receiveUsername, Integer custId, String addrProvince, String addrCity, String addrArea, String addrStreet, String addrDetail, Integer status, Integer version, LocalDateTime createTime, LocalDateTime updateTime) {System.out.println(调用ReceiveAddress 的有参构造函数.);this.addrId addrId;this.receiveUserTelno receiveUserTelno;this.username receiveUsername;this.custId custId;this.addrProvince addrProvince;this.addrCity addrCity;this.addrArea addrArea;this.addrStreet addrStreet;this.addrDetail addrDetail;this.status status;this.version version;this.createTime createTime;this.updateTime updateTime;}public Integer getAddrId() {return addrId;}public void setAddrId(Integer addrId) {this.addrId addrId;}public Long getReceiveUserTelno() {return receiveUserTelno;}public void setReceiveUserTelno(Long receiveUserTelno) {this.receiveUserTelno receiveUserTelno;}public String getReceiveUsername() {return username;}public void setReceiveUsername(String receiveUsername) {System.out.println(……………..调用了setReceiveUsername);this.username receiveUsername;}public Integer getCustId() {return custId;}public void setCustId(Integer custId) {this.custId custId;}public String getAddrProvince() {return addrProvince;}public void setAddrProvince(String addrProvince) {this.addrProvince addrProvince;}public String getAddrCity() {return addrCity;}public void setAddrCity(String addrCity) {this.addrCity addrCity;}public String getAddrArea() {return addrArea;}public void setAddrArea(String addrArea) {this.addrArea addrArea;}public String getAddrStreet() {return addrStreet;}public void setAddrStreet(String addrStreet) {this.addrStreet addrStreet;}public String getAddrDetail() {return addrDetail;}public void setAddrDetail(String addrDetail) {this.addrDetail addrDetail;}public Integer getStatus() {return status;}public void setStatus(Integer status) {this.status status;}public Integer getVersion() {return version;}public void setVersion(Integer version) {this.version version;}public LocalDateTime getCreateTime() {return createTime;}public void setCreateTime(LocalDateTime createTime) {this.createTime createTime;}public LocalDateTime getUpdateTime() {return updateTime;}public void setUpdateTime(LocalDateTime updateTime) {this.updateTime updateTime;}Overridepublic String toString() {return ReceiveAddress{ addrId addrId , receiveUserTelno receiveUserTelno , receiveUsername username , custId custId , addrProvince addrProvince , addrCity addrCity , addrArea addrArea , addrStreet addrStreet , addrDetail addrDetail , status status , version version , createTime createTime , updateTime updateTime };} } 通过反射生成对象并给对象赋值 /ReceiveAddress address1. 创建对象2. 属性赋值new : 创建对象构造函数的作用 初始化对象 initial/// ReceiveAddress address new ReceiveAddress(); // address.setReceiveUsername(smith);// 1通过反射创建ReceiveAddress 对象 – 前提ReceiveAddress 有无参构造函数ReceiveAddress address ReceiveAddress.class.newInstance(); // 会调用 无参构造函数//(2) 通过反射调用set方法 setReceiveUsername(String)Method method ReceiveAddress.class.getMethod(setReceiveUsername,String.class);method.invoke(address,dd);传参 package com.example.controller;import com.example.entity.ReceiveAddress; import org.springframework.stereotype.Controller; import org.springframework.stereotype.Service; import org.springframework.web.bind.annotation.;import java.util.Locale;/** 请求的相关参数/ Controller public class HelloController {// http://localhost:8080/app/fun1?usernamesmithuserAge20GetMapping(fun1)ResponseBodypublic String fun1(String username,Integer userAge){System.out.println(username);System.out.println(userAge);return fun1;}GetMapping(fun2)ResponseBodypublic String fun2(RequestParam(id) Integer addrId,RequestParam(telno)Long receiveUserTelno,RequestParam(username)String receiveUsername){String result addrId: addrId receiveUsername: receiveUsername receiveUserTelno :receiveUserTelno;return result;}// http://localhost:8080/app/fun3?addrId101receiveUsername%E5%B0%8F%E7%8E%8BreceiveUserTelno18943049303// 实参的key 与 pojo的属性名相同// 面向对象 反射/** 1通过反射创建ReceiveAddress 对象 – 前提ReceiveAddress 调用无参构造函数* 2通过反射set方法参数赋值*/GetMapping(fun3)ResponseBodypublic ReceiveAddress fun3(ReceiveAddress address){ // javabean (pojo) 无参构造函数 getsetreturn address;}/Customer (custId,custName,custPwd — getters,setters)URL : ….?custId101custNamesmithcustPwdabc123/GetMapping({addrId}) //URL : http://localhost:8080/app/receiveAddress/103ResponseBody // 返回json数据public ReceiveAddress getById(PathVariable(addrId) Integer addrId){return null;}}