5：IO流与项目挑战

  张三
李四

 王五
 赵六
  孙七
周八
  钱九
吴十

郑十一
  王十二
冯十三
 陈十四
褚十五
卫十六

蒋十七
沈十八
 韩十九
杨二十

public class Student {
    private Integer id;
    private String name;
    private Integer gender; //1表示男性 2表示女性
    private String phone;

    public Student(Integer id, String name, Integer gender, String phone) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.phone = phone;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender=" + gender +
                ", phone='" + phone + '\'' +
                '}';
    }
}

Student student = new Student(1, "doro", 2, "114514");

POST /login HTTP/1.1
Host: api.example.com
Content-Type: application/json
User-Agent: Mozilla/5.0
Content-Length: 45

{"username": "admin", "password": "123456"}

HTTP/1.1 200 OK
Content-Type: application/json
Set-Cookie: sessionid=abc123; Path=/
Content-Length: 30

{"status": "success", "token": "xyz"}

{
  "key1": "value1",
  "key2": 123,
  "key3": true,
  "key4": null,
  "key5": { "nestedKey": "nestedValue" },
  "key6": [1, 2, 3]
}

    <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>2.0.51</version>
        </dependency>

//fastjson这个库需要定义一个类作为映射
public class User {
    private String name;
    private int age;
    // 必须有无参构造函数
    // 必须提供 getter/setter (Fastjson 依赖它们)
}
//然后通过给这个类实例化具体数据构建json
User user = new User("Alice", 25);
String json = JSON.toJSONString(user);
// 结果: {"age":25,"name":"Alice"}

//{"age":25,"name":"Alice"}
String json = "{\"name\":\"Alice\",\"age\":25}";
User user = JSON.parseObject(json, User.class);
//这时候user这个对象就保存了对应字段的内容

import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;

public class Client {
    private static final String SERVER_URL = "http://localhost:8000/query";

    public static void main(String[] args) {
        while (true) {
            //读取用户输入的快递单号和手机号


            try {
                /*
                用fastjson这个依赖构造json格式，构造的样例为
                {"trackingNumber":"SF123456789","phone":"19867653558"}
                */

                // 将这个json格式的数据写入请求体并发送HTTP POST请求


                // 读取响应，状态码是200才是响应成功
                if (connection.getResponseCode() == 200) {
                   /*
                   解析服务端响应的json格式，拿到取件码，拿不到就显示msg的内容
                   样例：
                   例如：{"pick_code":4096,"msg":"success"}
                       {"pick_code":null,"msg":"手机号不正确"}
                   */


                   }
                } else {
                    System.out.println("查询失败，状态码: " + connection.getResponseCode());
                }
            } catch (IOException e) {
                System.out.println("请求发生错误: " + e.getMessage());
            }
        }

        scanner.close();
        System.out.println("客户端已退出");
    }
}

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Server {
    private static final int PORT = 8000;
    private static final Map<String, String> expressMap = new HashMap<>();

    public static void main(String[] args) throws IOException {
        // 初始化一些测试数据
        initializeExpressData();
        // 创建HTTP服务器，监听指定端口
        HttpServer server = HttpServer.create(new InetSocketAddress(PORT), 0);
        // 设置路由和处理程序
        server.createContext("/query", new QueryHandler());
        // 启动服务器
        server.start();
        System.out.println("Server started on port " + PORT);
    }

    private static void initializeExpressData() {
        // 添加一些测试数据
        //键的构成是  快递单号_手机号
        expressMap.put("SF123456789_13005433678", "1234");
        expressMap.put("JD987654321_19805433168", "5678");
        expressMap.put("YT456789123_13905479698", "9012");
        expressMap.put("ZT789123456_18505433664", "3456");
    }

    static class QueryHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            if ("POST".equals(exchange.getRequestMethod())) {
                // 读取请求体


                try {
                    // 解析JSON请求（例如：{"trackingNumber":"SF123456789"}）获得单号


                    // 在expressMap中查询取件码，


                    /*
                    构建响应的json
                    例如：{"pick_code":4096,"msg":"success"}
                    如果找不到快递则是{"pick_code":null,"msg":"根据各种情况写提示信息"}
                    */


                    // 发送响应

                } catch (Exception e) {
                    // 处理异常，返回400状态码(Bad Request)

                }
            } else {
                // 非POST请求返回405 Method Not Allowed
                exchange.sendResponseHeaders(405, -1);
            }
        }
    }
}