Android(安卓)OkHttp基本用法

okhttp引用设置

Android studio添加引用okhttp.jar包

注意：build.gradle中总共2个添加
compile 'com.squareup.okio:okio:1.5.0'
compile 'com.squareup.okhttp:okhttp:2.4.0'

描述：
关键1：使用前，对于Android Studio的用户，可以选择添加:
compile 'com.squareup.okhttp:okhttp:2.4.0'

关键2：okhttp内部依赖okio，所以，别忘了同时导入okio：
compile 'com.squareup.okio:okio:1.5.0'

具体操作如下：
在app文件夹 ->

build.gradle文件添加相应代码 ->
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'

compile 'com.squareup.okio:okio:1.5.0'
compile 'com.squareup.okhttp:okhttp:2.5.0'

compile files('libs/gson-2.2.1.jar')
compile files('libs/okhttp-2.3.0.jar')

注意：compile files('libs/okhttp-2.3.0.jar')是手动添加jar文件生成的代码，
compile 'com.squareup.okhttp:okhttp:2.5.0'是用系统搜寻出来的格式
2者之中保留一个即可。
}

修改完毕点击右上角"Sync Now" ->

注意：配置Android权限，设置允许网络请求
在AndroidManifest.xml文件中

===============================================
关键类：RequestBody添加参数
RequestBody formBody = new FormEncodingBuilder()
.add("platform", "android")
.add("name", "bug")
.add("subject", "XXXXXXXXXXXXXXX")
.build();

关键类：Request
Request request = new Request.Builder()
.url(url)
.post(body)
.build();

关键类：Response
Response response = client.newCall(request).execute();

关键类：call.enqueue：以异步的方式去执行请求，所以调用的是call.enqueue，将call加入调度队列，然后等待任务执行完成，在Callback中即可得到结果。
Call call = mOkHttpClient.newCall(request);
//请求加入调度
call.enqueue(new Callback()
{
@Override
public void onFailure(Request request, IOException e)
{
}

@Override
public void onResponse(final Response response) throws IOException
{
//String htmlStr = response.body().string();
}
});

网络请求权限设置

<?xml version="1.0" encoding="utf-8"?>
package="com.info.activity">
（设置允许网络请求）

=========================================================HTTP请求之 同步 GET请求=========================================================private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    Request request = new Request.Builder()            .url("http://publicobject.com/helloworld.txt")            .build();    Response response = client.newCall(request).execute();    if (!response.isSuccessful())        throw new IOException("Unexpected code " + response);    Headers responseHeaders = response.headers();    for (int i = 0; i < responseHeaders.size(); i++) {        System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));    }    System.out.println(response.body().string());}Response类的string()方法会把文档的所有内容加载到内存，适用于小文档，对应大于1M的文档，应   使用流()的方式获取。response.body().byteStream()=========================================================HTTP请求之 异步 GET请求=========================================================private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    Request request = new Request.Builder()            .url("http://publicobject.com/helloworld.txt")            .build();    client.newCall(request).enqueue(new Callback() {        @Override        public void onFailure(Request request, IOException e) {            e.printStackTrace();        }        @Override        public void onResponse(Response response) throws IOException {            if (!response.isSuccessful()) {                throw new IOException("Unexpected code " + response);            }            Headers responseHeaders = response.headers();            for (int i = 0; i < responseHeaders.size(); i++) {                System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));            }            System.out.println(response.body().string());        }    });}读取响应会阻塞当前线程，所以发起请求是在主线程，回调的内容在非主线程中。=========================================================HTTP请求之POST方式提交字符串=========================================================private static final MediaType MEDIA_TYPE_MARKDOWN        = MediaType.parse("text/x-markdown; charset=utf-8");private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    String postBody = ""            + "Releases\n"            + "--------\n"            + "\n"            + " * _1.0_ May 6, 2013\n"            + " * _1.1_ June 15, 2013\n"            + " * _1.2_ August 11, 2013\n";    Request request = new Request.Builder()            .url("https://api.github.com/markdown/raw")            .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, postBody))            .build();    Response response = client.newCall(request).execute();    if (!response.isSuccessful())         throw new IOException("Unexpected code " + response);    System.out.println(response.body().string());}因为整个请求体都在内存中，应避免提交1M以上的文件=========================================================HTTP请求之POST方式提交流=========================================================private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    RequestBody requestBody = new RequestBody() {        @Override        public MediaType contentType() {            return MEDIA_TYPE_MARKDOWN;        }        @Override        public void writeTo(BufferedSink sink) throws IOException {            sink.writeUtf8("Numbers\n");            sink.writeUtf8("-------\n");            for (int i = 2; i <= 997; i++) {                sink.writeUtf8(String.format(" * %s = %s\n", i, factor(i)));            }        }        private String factor(int n) {            for (int i = 2; i < n; i++) {                int x = n / i;                if (x * i == n) return factor(x) + " × " + i;            }            return Integer.toString(n);        }    };    Request request = new Request.Builder()            .url("https://api.github.com/markdown/raw")            .post(requestBody)            .build();    Response response = client.newCall(request).execute();    if (!response.isSuccessful())         throw new IOException("Unexpected code " + response);    System.out.println(response.body().string());}使用Okio框架以流的形式将内容写入，这种方式不会出现内存溢出问题。=========================================================HTTP请求之POST方式提交文件=========================================================public static final MediaType MEDIA_TYPE_MARKDOWN        = MediaType.parse("text/x-markdown; charset=utf-8");private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    File file = new File("README.md");    Request request = new Request.Builder()            .url("https://api.github.com/markdown/raw")            .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file))            .build();    Response response = client.newCall(request).execute();    if (!response.isSuccessful())         throw new IOException("Unexpected code " + response);    System.out.println(response.body().string());}=========================================================HTTP请求之POST方式提交表单=========================================================private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    RequestBody formBody = new FormEncodingBuilder()            .add("search", "Jurassic Park")            .build();    Request request = new Request.Builder()            .url("https://en.wikipedia.org/w/index.php")            .post(formBody)            .build();    Response response = client.newCall(request).execute();    if (!response.isSuccessful())         throw new IOException("Unexpected code " + response);    System.out.println(response.body().string());}表单的每个Names-Values都进行了URL编码。如果服务器端接口未进行URL编码，可定制个  FormBuilder。=========================================================HTTP请求之文件上传（兼容html文件上传）=========================================================private static final String IMGUR_CLIENT_ID = "...";private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");private final OkHttpClient client = new OkHttpClient();public void run() throws Exception {    // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image    RequestBody requestBody = new MultipartBuilder()            .type(MultipartBuilder.FORM)            .addPart(                    Headers.of("Content-Disposition", "form-data; name=\"title\""),                    RequestBody.create(null, "Square Logo"))            .addPart(                    Headers.of("Content-Disposition", "form-data; name=\"image\""),                    RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))            .build();    Request request = new Request.Builder()            .header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)            .url("https://api.imgur.com/3/image")            .post(requestBody)            .build();    Response response = client.newCall(request).execute();    if (!response.isSuccessful())         throw new IOException("Unexpected code " + response);    System.out.println(response.body().string());}

代码实例

XML文件

<?xml version="1.0" encoding="utf-8"?>

Activity文件

package com.info.activity;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import com.google.gson.Gson;import com.info.config.ConstantInfo;import com.info.model.UserView;import com.squareup.okhttp.Call;import com.squareup.okhttp.Callback;import com.squareup.okhttp.FormEncodingBuilder;import com.squareup.okhttp.OkHttpClient;import com.squareup.okhttp.Request;import com.squareup.okhttp.RequestBody;import com.squareup.okhttp.Response;import java.io.IOException;import java.util.HashMap;import java.util.Map;public class Main2Activity extends AppCompatActivity {    private Button btnLogin;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);        btnLogin = (Button) findViewById(R.id.button4);        btnLogin.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                try {                    String result = run();                } catch (IOException e) {                    e.printStackTrace();                }            }        });    }    public String run() throws IOException {        String loginUrl = "http://192.168.1.41:8023/api/user/login";        RequestBody formBody = new FormEncodingBuilder()                .add("UserName", "admin")                .add("Password", "000000")                .build();        OkHttpClient mOkHttpClient = new OkHttpClient();        Request request = new Request.Builder()                .url(loginUrl)                .post(formBody)                .build();        Call call = mOkHttpClient.newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Request request, IOException e) {            }            @Override            public void onResponse(Response response) throws IOException {                String jsonResult =  response.body().string();                Gson gson=new Gson();                UserView model = gson.fromJson(jsonResult,UserView.class);                Log.e("T", jsonResult);                Log.e("r", model.getData().getUserName());            }        });        return "";    }}

升级版，封装Okhttp工具类，待续...

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