安卓okhttp3与服务器通过json数据交互解析与上传

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

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1. /**
2. * 发送post请求
3. */
4. public User user = new User();
5. public void postRequest(){
6. OkHttpClient client = new OkHttpClient();
8. user.setUsername(username.getText().toString());
9. user.setPassword(content.getText().toString());
10. Gson gson = new Gson();
11. //使用Gson将对象转换为json字符串
12. String json = gson.toJson(user);
13. RequestBody requestBody = FormBody.create(MediaType.parse("application/json; charset=utf-8")
14. , json);
15. Request request = new Request.Builder()
16. .url(httpURL+"/HttpWeb/LoginServlet")//请求的url
17. .post(requestBody)
18. .build();
20. Call call = client.newCall(request);
21. call.enqueue(new Callback() {
22. @Override
23. public void onFailure(Call call, IOException e) {
25. }
27. @Override
28. public void onResponse(Call call, Response response) throws IOException {
29. final String res = response.body().string();
30. runOnUiThread(new Runnable() {
31. @Override
32. public void run() {
33. resultTV.setText(res);
34. Log.v("Main.ID=",res);
35. if (!res.equals(null)){
36. Toast.makeText(Main.this,"登陆成功",Toast.LENGTH_SHORT).show();
37. user.setId(res);
38. Intent intent = new Intent();
39. intent.setClass(Main.this,MainActivity.class);//跳转到加载界面
40. Bundle bundle = new Bundle();
41. bundle.putParcelable("user", user);
42. intent.putExtras(bundle);
43. startActivity(intent);
44. }else{
45. Toast.makeText(Main.this,"登陆失败",Toast.LENGTH_SHORT).show();
46. }
47. }
48. });
49. }
50. });
51. }

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

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1. import android.os.Parcel;
2. import android.os.Parcelable;
4. import java.io.Serializable;
6. /**
7. * Created by acer1 on 2018/4/5.
8. */
10. public class User implements Parcelable,Serializable{
11. private String id;
12. private String username;
13. private String password;
14. private String Nickname;
15. private String Individuality_signature;
17. public User(Parcel in) {
18. id = in.readString();
19. username = in.readString();
20. password = in.readString();
21. }
23. public static final Creator<User> CREATOR = new Creator<User>() {
24. @Override
25. public User createFromParcel(Parcel in) {
26. return new User(in);
27. }
29. @Override
30. public User[] newArray(int size) {
31. return new User[size];
32. }
33. };
35. public User() {
37. }
39. public String getNickname() {
40. return Nickname;
41. }
43. public void setNickname(String nickname) {
44. Nickname = nickname;
45. }
47. public String getIndividuality_signature() {
48. return Individuality_signature;
49. }
51. public void setIndividuality_signature(String individuality_signature) {
52. Individuality_signature = individuality_signature;
53. }
55. public String getId() {
56. return id;
57. }
59. public void setId(String id) {
60. this.id = id;
61. }
63. public String getUsername() {
64. return username;
65. }
67. public void setUsername(String username) {
68. this.username = username;
69. }
71. public String getPassword() {
72. return password;
73. }
75. public void setPassword(String password) {
76. this.password = password;
77. }
80. @Override
81. public int describeContents() {
82. return 0;
83. }
85. @Override
86. public void writeToParcel(Parcel dest, int flags) {
87. dest.writeString(id);
88. dest.writeString(username);
89. dest.writeString(password);
90. }
91. }

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

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1. protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
3. response.setContentType("application/json");
4. response.setCharacterEncoding("UTF-8");
5. request.setCharacterEncoding("UTF-8");
7. /**
8. * 接收json
9. */
10. BufferedReader reader = request.getReader();
11. String json = reader.readLine();
12. System.out.println(json);
13. Gson gson =new Gson();
14. User user = gson.fromJson(json, User.class);
15. System.out.println(user.getUsername());
16. System.out.println(user.getPassword());
17. PrintWriter out = response.getWriter();
18. Integer msg;
19. try {
20. msg = UserDao.selectUser(user);
21. out.print(msg);
22. } catch (Exception e) {
23. // TODO Auto-generated catch block
24. e.printStackTrace();
25. }
26. reader.close();
27. }

其中提取json数据和解析的代码就是下面这段代码

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1. response.setContentType("application/json");
2. response.setCharacterEncoding("UTF-8");
3. request.setCharacterEncoding("UTF-8");
5. /**
6. * 接收json
7. */
8. BufferedReader reader = request.getReader();
9. String json = reader.readLine();
10. System.out.println(json);
11. Gson gson =new Gson();
12. User user = gson.fromJson(json, User.class);
13. System.out.println(user.getUsername());
14. System.out.println(user.getPassword());

然后就是服务器端的javabean

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1. public class User {
3. private String id;
4. private String username;
5. private String password;
6. private String Nickname;
7. private String Individuality_signature;
11. public String getNickname() {
12. return Nickname;
13. }
14. public void setNickname(String nickname) {
15. Nickname = nickname;
16. }
17. public String getIndividuality_signature() {
18. return Individuality_signature;
19. }
20. public void setIndividuality_signature(String individuality_signature) {
21. Individuality_signature = individuality_signature;
22. }
23. public String getId() {
24. return id;
25. }
26. public void setId(String id) {
27. this.id = id;
28. }
29. public String getUsername() {
30. return username;
31. }
32. public void setUsername(String username) {
33. this.username = username;
34. }
35. public String getPassword() {
36. return password;
37. }
38. public void setPassword(String password) {
39. this.password = password;
40. }
43. }

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，