OKHTTP3的简单使用，表单提交，json传递

叁歲伎倆 2022-05-22 07:19 271阅读 0赞

原文地址：https://blog.csdn.net/knight1996/article/details/77995547

# OKHTTP3的简单使用 #

使用okhttp3需引入以下依赖

compile 'com.squareup.okhttp3:okhttp:3.9.0'

### 1.okhttp GET方式请求 ###

//创建OkHttpClient对象
                OkHttpClient okHttpClient  = new OkHttpClient.Builder()
                        .connectTimeout(10, TimeUnit.SECONDS)
                        .writeTimeout(10,TimeUnit.SECONDS)
                        .readTimeout(20, TimeUnit.SECONDS)
                        .build();
    
                final Request request = new Request.Builder()
                        .url("http://172.20.192.168:8080/getbookByFrom?name=android基础&price=50")//请求的url
                        .get()//设置请求方式，get()/post() 查看Builder()方法知，在构建时默认设置请求方式为GET
                        .build(); //构建一个请求Request对象
    
                //创建/Call
                Call call = okHttpClient.newCall(request);
                //加入队列 异步操作
                call.enqueue(new Callback() {
                    //请求错误回调方法
                    @Override
                    public void onFailure(Call call, IOException e) {
                        System.out.println("连接失败");
                    }
                    //异步请求(非主线程)
                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        if(response.code()==200) {
                            System.out.println(response.body().string());
                        }             
                });

注：在okhttp3中 如果想设置超时时间直接通过OkHttpClient 对象来设置

okHttpClient .setConnectTimeout(10, TimeUnit.SECONDS);  
         okHttpClient .setWriteTimeout(10, TimeUnit.SECONDS);  
         okHttpClient .setReadTimeout(20, TimeUnit.SECONDS);

但okhttp3OkHttpClient 对象没有这个方法，需要借助new OkHttpClient.Builder()按照上面的方法设置超时时间。

### 2.okhttp POST方式请求（提交表单方式） ###

OkHttpClient okHttpClient  = new OkHttpClient.Builder()
                    .connectTimeout(10, TimeUnit.SECONDS)
                    .writeTimeout(10,TimeUnit.SECONDS)
                    .readTimeout(20, TimeUnit.SECONDS)
                    .build();
    
            //post方式提交的数据
            FormBody formBody = new FormBody.Builder()
                    .add("name", "android基础")
                    .add("price", "50")
                    .build();
    
            final Request request = new Request.Builder()
                    .url("http://172.20.192.168:8080/getbookByFrom")//请求的url
                    .post(formBody)
                    .build();
    
    
            //创建/Call
            Call call = okHttpClient.newCall(request);
            //加入队列 异步操作
            call.enqueue(new Callback() {
                //请求错误回调方法
                @Override
                public void onFailure(Call call, IOException e) {
                    System.out.println("连接失败");
                }
    
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    if(response.code()==200) {
                        System.out.println(response.body().string());
                    }
                }
            });

### 3.okhttp POST方式请求（提交json方式） ###

OkHttpClient okHttpClient  = new OkHttpClient.Builder()
                    .connectTimeout(10, TimeUnit.SECONDS)
                    .writeTimeout(10,TimeUnit.SECONDS)
                    .readTimeout(20, TimeUnit.SECONDS)
                    .build();
    
            Book book = new Book();
            book.setName("android基础");
            book.setPrice(59);
            //使用Gson 添加 依赖 compile 'com.google.code.gson:gson:2.8.1'
            Gson gson = new Gson();
            //使用Gson将对象转换为json字符串
            String json = gson.toJson(book);
    
            //MediaType 设置Content-Type 标头中包含的媒体类型值
            RequestBody requestBody = FormBody.create(MediaType.parse("application/json; charset=utf-8")
            , json);
    
             Request request = new Request.Builder()
                    .url("http://172.20.192.168:8080/getbookByJson")//请求的url
                    .post(requestBody)
                    .build();
    
            //创建/Call
            Call call = okHttpClient.newCall(request);
            //加入队列 异步操作
            call.enqueue(new Callback() {
                //请求错误回调方法
                @Override
                public void onFailure(Call call, IOException e) {
                    System.out.println("连接失败");
                }
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    System.out.println(response.body().string());
                }
            });