安卓okhttp3与服务器通过json数据交互解析与上传

太过爱你忘了你带给我的痛 2022-05-27 05:19 291阅读 0赞

## 最近刚好做一个app，然后就不太会json数据交互，就上网查了一些，发现并没有快餐类的代码。所以这里就直接给大家安卓端和服务器端的快餐代码，对初学者还是很有帮助的，大家可以依葫芦画瓢，不喜勿喷 ##

首先是安卓端，我主要上传一个User对象，下面是安卓端的代码通过okhttp3，gson编译成json格式上传

需要引用

compile 'com.google.code.gson:gson:2.8.1'

### 下面是客户端的一个功能的代码，主要将对象User上传给服务器，其中通过bundle将返回的对象传入到别的activity。本来想删除的，但是对于初学者应该还是很实用，gson.toJson（）这个方法就是将user对象编译成json格式的字符串，方便上传给服务器    ###

/**
         * 发送post请求
         */
        public User user = new User();
        public void postRequest(){
            OkHttpClient client = new OkHttpClient();
    
            user.setUsername(username.getText().toString());
            user.setPassword(content.getText().toString());
            Gson gson = new Gson();
            //使用Gson将对象转换为json字符串
            String json = gson.toJson(user);
            RequestBody requestBody = FormBody.create(MediaType.parse("application/json; charset=utf-8")
                    , json);
            Request request = new Request.Builder()
                    .url(httpURL+"/HttpWeb/LoginServlet")//请求的url
                    .post(requestBody)
                    .build();
    
            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
    
                }
    
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    final  String res = response.body().string();
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            resultTV.setText(res);
                            Log.v("Main.ID=",res);
                            if (!res.equals(null)){
                                Toast.makeText(Main.this,"登陆成功",Toast.LENGTH_SHORT).show();
                                user.setId(res);
                                Intent intent = new Intent();
                                intent.setClass(Main.this,MainActivity.class);//跳转到加载界面
                                Bundle bundle = new Bundle();
                                bundle.putParcelable("user", user);
                                intent.putExtras(bundle);
                                startActivity(intent);
                            }else{
                                Toast.makeText(Main.this,"登陆失败",Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
                }
            });
        }

User表，其中实现接口Parcelable是为了让bundle可以传递这个对象，使用bundle.putParcelable()这个办法

import android.os.Parcel;
    import android.os.Parcelable;
    
    import java.io.Serializable;
    
    /**
     * Created by acer1 on 2018/4/5.
     */
    
    public class User implements Parcelable,Serializable{
        private String id;
        private String username;
        private String password;
        private String Nickname;
        private String Individuality_signature;
    
        public User(Parcel in) {
            id = in.readString();
            username = in.readString();
            password = in.readString();
        }
    
        public static final Creator<User> CREATOR = new Creator<User>() {
            @Override
            public User createFromParcel(Parcel in) {
                return new User(in);
            }
    
            @Override
            public User[] newArray(int size) {
                return new User[size];
            }
        };
    
        public User() {
    
        }
    
        public String getNickname() {
            return Nickname;
        }
    
        public void setNickname(String nickname) {
            Nickname = nickname;
        }
    
        public String getIndividuality_signature() {
            return Individuality_signature;
        }
    
        public void setIndividuality_signature(String individuality_signature) {
            Individuality_signature = individuality_signature;
        }
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    
    
        @Override
        public int describeContents() {
            return 0;
        }
    
        @Override
        public void writeToParcel(Parcel dest, int flags) {
            dest.writeString(id);
            dest.writeString(username);
            dest.writeString(password);
        }
    }

### 现在客户端基本就完事了，下面是服务器的代码，我开始学的时候就主要想学怎么接收json格式的数据，我相信大家也是想学怎么接收json数据格式的数据，通过gson将接收的数据解析成对象，看代码。我们还要在服务器里面写一个javabean，让json数据映射成这个javabean,方便提取数据 ###

### 首先我们导入一些包，让我们可以接收到json数据 ###

![70][]

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	
    	response.setContentType("application/json");
            response.setCharacterEncoding("UTF-8");
            request.setCharacterEncoding("UTF-8");
    
            /**
             * 接收json
             */
            BufferedReader reader = request.getReader();
            String json = reader.readLine();
            System.out.println(json);
            Gson gson =new Gson();
            User user = gson.fromJson(json, User.class);
            System.out.println(user.getUsername());
            System.out.println(user.getPassword());
            PrintWriter out = response.getWriter();
            Integer msg;
    		try {
    			msg = UserDao.selectUser(user);
    			out.print(msg);
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
            reader.close();
    	}

其中提取json数据和解析的代码就是下面这段代码

response.setContentType("application/json");
            response.setCharacterEncoding("UTF-8");
            request.setCharacterEncoding("UTF-8");
    
            /**
             * 接收json
             */
            BufferedReader reader = request.getReader();
            String json = reader.readLine();
            System.out.println(json);
            Gson gson =new Gson();
            User user = gson.fromJson(json, User.class);
            System.out.println(user.getUsername());
            System.out.println(user.getPassword());

然后就是服务器端的javabean

public class User {
    	
    	private String id;
    	private String username;
    	private String password;
    	private String Nickname;
    	private String Individuality_signature;
    	
    	
    	
    	public String getNickname() {
    		return Nickname;
    	}
    	public void setNickname(String nickname) {
    		Nickname = nickname;
    	}
    	public String getIndividuality_signature() {
    		return Individuality_signature;
    	}
    	public void setIndividuality_signature(String individuality_signature) {
    		Individuality_signature = individuality_signature;
    	}
    	public String getId() {
    		return id;
    	}
    	public void setId(String id) {
    		this.id = id;
    	}
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	
    
    }

到这里基本的过程就结束了，从安卓端上传json数据到服务器端解析json数据，将json数据解析成javabean对象。不知道对初学者有没有帮助，又不懂的可以直接@我，哈哈哈哈

[70]: /images/20220527/4434da44ad6b47918f0410437bb6eaec.png