001 okhttp3的POST使用

　　继续使用上面的项目

1.被调用的项目

package com.jun.web2forokhttp.okhttp;

import com.jun.web2forokhttp.bean.HttpDomain;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

@RestController
public class PostReq {
    @PostMapping(value = "/post/getInfo")
    @ResponseBody
    public HttpDomain getInfo(@RequestBody HttpDomain httpDomain){
        HttpDomain useHttpDomain =new HttpDomain();
        useHttpDomain.setType(httpDomain.getType()+"-post");
        useHttpDomain.setAge(httpDomain.getAge()+10);
        return useHttpDomain;
    }
}

　　bean：

package com.jun.web2forokhttp.bean;

import lombok.Data;

@Data
public class HttpDomain {
    private String type;
    private String name;
    private String age;
}

　　

2.调用的程序

package com.jun.web.okhttp;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jun.web.okhttp.bean.HttpDomain;
import com.jun.web.okhttp.bean.HttpResponseDomain;
import okhttp3.*;

import java.io.IOException;

public class PostHttp {
    public static void main(String[] args) throws JsonProcessingException {
        formBody();
    }

    /**
     * 没有请求头的请求
     */
    public static void formBody() throws JsonProcessingException {
        HttpDomain httpDomain = new HttpDomain();
        httpDomain.setType("1");
        httpDomain.setName("tom");
        httpDomain.setAge(10);
        ObjectMapper objectMapper = new ObjectMapper();
        String Json=objectMapper.writeValueAsString(httpDomain);  //转JSON

        String url = "http://localhost:8080/post/getInfo";
        OkHttpClient okHttpClient = new OkHttpClient();
        MediaType json = MediaType.parse("application/json; charset=utf-8");
        RequestBody body = RequestBody.create(json,Json);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();

        Call call = okHttpClient.newCall(request);
        try{
            Response response = call.execute();
            String result = response.body().string();
            System.out.println("post="+result);
            HttpResponseDomain httpResponseDomain = objectMapper.readValue(result,HttpResponseDomain.class);  //转对象
            System.out.println("httpResponseDomain="+httpResponseDomain);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

　　需要的bean

package com.jun.web.okhttp.bean;

import lombok.Data;

import java.io.Serializable;

@Data
public class HttpDomain implements Serializable{
    private String type;
    private String name;
    private int age;
}

　　

package com.jun.web.okhttp.bean;

import lombok.Builder;
import lombok.Data;

@Data
@Builder
public class HttpResponseDomain {
    private String type;
    private String age;
    private String name;
    public HttpResponseDomain(){}
    public HttpResponseDomain(String type,String age,String name){
        this.type=type;
        this.age=age;
        this.name=name;
    }
//    private String name;
}

　　

3.效果

　　

二：注意点

1.RequestBody的数据格式

　　常见的content-type主要有三种

　　　　application/x-www-form-urllencoded

　　　　application/form-data

　　　　application/json

　　上文的示例就是json格式。

2.如果数据包含文件

RequestBody requestBody = new MultipartBody.Builder()
    .setType(MultipartBody.FORM)
    .addFormDataPart("file", file.getName(), RequestBody.create(MediaType.parse("image/png"), file))
    .build();

三：同步与异步

1.异步

package com.jun.web.okhttp;

import okhttp3.*;

import java.io.IOException;

public class Asyn {
    public static void main(String[] args) {
        String url = "https://www.baidu.com/";
        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder()
                .url(url)
                .build();
        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                System.out.println("我是异步线程,线程Id为:" + Thread.currentThread().getId());
            }
        });
        for (int i = 0; i < 10; i++) {
            System.out.println("我是主线程,线程Id为:" + Thread.currentThread().getId());
            try {
                Thread.currentThread().sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

　　效果