GSON方式生成和解析json数据
来源:互联网 发布:傲视天地 源码 编辑:程序博客网 时间:2024/05/12 04:15
类型一:JavaBean
类型二:List<JavaBean>
类型三:List<String>
类型四:List<Map<String,Object>>
一.Gson将上面的四种数据对象转换成json字符串的方法都是一样的
Gson gson = new Gson();
String jsonString = gson.toJson(obj);
二.Gson将json字符串转化成JavaBean对象
1.类型一:JavaBean
Person person = new Person("香港","刘德华",1001);
Gson gson = new Gson();
//这里将javabean转化成json字符串
String jsonString = gson.toJson(person);
System.out.println(jsonString);
//这里将json字符串转化成javabean对象,
person = gson.fromJson(jsonString,Person.class);
2.类型二:List<JavaBean>
将json字符串转化成List<JavaBean>对象
Person person1 = new Person("香港","刘德华",1001);
Person person2 = new Person("韩国","宋慧乔",1002);
List<Person> persons = new ArrayList<Person>();
persons.add(person1);
persons.add(person2);
Gson gson = new Gson();
//这里将lsit<javabean>转化成json字符串
String jsonString = gson.toJson(persons);
//解析json字符串
List<Person> persons2 = gson.fromJson(jsonString, new TypeToken<List<Person>>(){}.getType());
3.类型三:List<String>
将json字符串转化成List<String>对象
List<String> list = new ArrayList<String>();
list.add("gson1");
list.add("gson2");
list.add("gson3");
Gson gson = new Gson();
String jsonString = gson.toJson(list);
System.out.println("json字符串:"+jsonString);
//解析json字符串
List<String> list2 = gson.fromJson(jsonString, new TypeToken<List<String>>(){}.getType());
4.类型四:List<Map<String,Object>>
将json字符串转化成List<Map<String,Object>>对象
Map<String,Object> map = new HashMap<String,Object>();
map.put("key1", "value1");
map.put("key2", "value2");
Map<String,Object> map2 = new HashMap<String,Object>();
map2.put("key1", 1);
map2.put("key2", 2);
List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
list.add(map);
list.add(map2);
Gson gson = new Gson();
String jsonString = gson.toJson(list);
System.out.println("json字符串:"+jsonString);
//解析json字符串
List<Map<String,Object>> list2 = gson.fromJson(jsonString, new TypeToken<List<Map<String,Object>>>(){}.getType());
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本程序服务器端通过Gson生成json字符串数据,客户端用Gson将从服务器端接收的json字符串分别转换为<Person>,List<Person>,List<String>,List<Map<String,Object>>4种类型,程序思路和过程跟前篇 Android Intent传递 object , list<object>,list<Map<String,Object>> 相同,唯一区别就是:生成json用Gson方式,解析json用Gson方式。
程序结果截图:
1.点击“解析Person数据”按钮
3.点击“解析Persons”数据按钮
4.点击“解析listString数据”按钮
5.点击“解析listMap数据”按钮
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客户端eclipse android工程目录(左边)服务器端myeclipse web工程目录(右边)
服务器端
1.Person.Java
- package com.gson.data;
- public class Person {
- private int id;
- private String name;
- private String address;
- public Person() {
- // TODO Auto-generated constructor stub
- }
- public int getId() {
- return id;
- }
- public void setId(int id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getAddress() {
- return address;
- }
- public void setAddress(String address) {
- this.address = address;
- }
- public Person(int id, String name, String address) {
- super();
- this.id = id;
- this.name = name;
- this.address = address;
- }
- @Override
- public String toString() {
- return "Person [id=" + id + ", name=" + name + ", address=" + address
- + "]";
- }
- }
2.GsonService.java
- package com.gson.service;
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import com.gson.data.Person;
- public class GsonService {
- public static Person getPerson() {
- Person person = new Person(1001, "刘德华", "香港");
- return person;
- }
- public static List<Person> getListPersons() {
- List<Person> persons = new ArrayList<Person>();
- Person person1 = new Person(1001, "刘德华", "香港");
- Person person2 = new Person(1002, "宋慧乔", "韩国");
- persons.add(person1);
- persons.add(person2);
- return persons;
- }
- public static List<String> getListString(){
- List<String> list = new ArrayList<String>();
- list.add("美国");
- list.add("中国");
- list.add("俄罗斯");
- return list;
- }
- public static List<java.util.Map<String, Object>> getListMap(){
- List<java.util.Map<String, Object>> list = new ArrayList<Map<String,Object>>();
- java.util.Map<String,Object> map1 = new HashMap<String,Object>();
- map1.put("id",1001);
- map1.put("name","刘德华");
- map1.put("address","香港");
- java.util.Map<String,Object> map2 = new HashMap<String,Object>();
- map2.put("id",1002);
- map2.put("name","宋慧乔");
- map2.put("address","韩国");
- list.add(map1);
- list.add(map2);
- return list;
- }
- }
3.GsonTools.java
- package com.gson.tools;
- import com.google.gson.Gson;
- public class GsonTools {
- public static String creatJsonString(Object object) {
- Gson gson = new Gson();
- String jsonString = gson.toJson(object); // 用Gson方式 把object 保存为 json字符串
- return jsonString;
- }
- }
4.GsonAction.java
- package com.gson.action;
- import java.io.IOException;
- import java.io.PrintWriter;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import com.gson.service.GsonService;
- import com.gson.tools.GsonTools;
- public class GsonAction extends HttpServlet {
- /**
- * Destruction of the servlet. <br>
- */
- public void destroy() {
- super.destroy(); // Just puts "destroy" string in log
- // Put your code here
- }
- /**
- * The doGet method of the servlet. <br>
- *
- * This method is called when a form has its tag value method equals to get.
- *
- * @param request the request send by the client to the server
- * @param response the response send by the server to the client
- * @throws ServletException if an error occurred
- * @throws IOException if an error occurred
- */
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- this.doPost(request, response);
- }
- /**
- * The doPost method of the servlet. <br>
- *
- * This method is called when a form has its tag value method equals to post.
- *
- * @param request the request send by the client to the server
- * @param response the response send by the server to the client
- * @throws ServletException if an error occurred
- * @throws IOException if an error occurred
- */
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- response.setContentType("text/html;charset=utf-8");
- request.setCharacterEncoding("utf-8");
- response.setCharacterEncoding("utf-8");
- String action_flag = request.getParameter("action_flag");
- PrintWriter out = response.getWriter();
- if ("person".equals(action_flag)) {
- String person = GsonTools.creatJsonString(GsonService.getPerson());
- out.println(person);
- } else if("persons".equals(action_flag)) {
- String persons = GsonTools.creatJsonString(GsonService.getListPersons());
- out.println(persons);
- }else if("listString".equals(action_flag)) {
- String listString = GsonTools.creatJsonString(GsonService.getListString());
- out.println(listString);
- }else if("listMap".equals(action_flag)) {
- String listMap = GsonTools.creatJsonString(GsonService.getListMap());
- out.println(listMap);
- }
- out.flush();
- out.close();
- }
- /**
- * Initialization of the servlet. <br>
- *
- * @throws ServletException if an error occurs
- */
- public void init() throws ServletException {
- // Put your code here
- }
- }
5. TestGson.java
- package com.gson.test;
- import com.gson.service.GsonService;
- import com.gson.tools.GsonTools;
- public class TestGson {
- /**
- * @param args
- */
- public static void main(String[] args) {
- // TODO Auto-generated method stub
- //Test1 Person
- System.out.println("Gson数据格式测试结果:\n");
- String person = GsonTools.creatJsonString(GsonService.getPerson()) ;
- //Test2 persons
- String listPerson = GsonTools.creatJsonString(GsonService.getListPersons()) ;
- //Test3 listString
- String listString = GsonTools.creatJsonString(GsonService.getListString()) ;
- //Test 4 listMap
- String listMap = GsonTools.creatJsonString(GsonService.getListMap()) ;
- System.out.println("测试结果1:"+person+"\n");
- System.out.println("测试结果2:"+listPerson+"\n");
- System.out.println("测试结果3:"+listString+"\n");
- System.out.println("测试结果4:"+listMap);
- }
- }
客户端
1.Person.java
- package com.gson.data;
- import java.io.Serializable;
- public class Person implements Serializable{
- private int id;
- private String name;
- private String address;
- public Person() {
- // TODO Auto-generated constructor stub
- }
- public int getId() {
- return id;
- }
- public void setId(int id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getAddress() {
- return address;
- }
- public void setAddress(String address) {
- this.address = address;
- }
- public Person(int id, String name, String address) {
- super();
- this.id = id;
- this.name = name;
- this.address = address;
- }
- @Override
- public String toString() {
- return "Person [id=" + id + ", name=" + name + ", address=" + address
- + "]";
- }
- }
2.HttpUtils.java
- package com.gson.http;
- import java.io.ByteArrayOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.HttpURLConnection;
- import java.net.URL;
- import android.annotation.SuppressLint;
- import android.os.StrictMode;
- /** 接收path服务器端返回的 InputStream, 转换为 json字符串
- * @author ben
- *
- */
- public class HttpUtils {
- public static String getJsonContent(String url_path ,String encode){
- String jsonString = "";
- try {
- URL url = new URL(url_path);
- HttpURLConnection connection = (HttpURLConnection)url.openConnection();
- connection.setConnectTimeout(3000);
- connection.setRequestMethod("GET");
- connection.setDoInput(true); //从服务器获得数据
- int responseCode = connection.getResponseCode();
- if (200 == responseCode) {
- jsonString = changeInputStream(connection.getInputStream(),encode);
- }
- } catch (Exception e) {
- // TODO: handle exception
- }
- //
- return jsonString;
- }
- private static String changeInputStream(InputStream inputStream , String encode) throws IOException {
- // TODO Auto-generated method stub
- String jsonString = null;
- ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
- byte[] data = new byte[1024];
- int len = 0;
- while((len=inputStream.read(data))!=-1){
- outputStream.write(data, 0, len);
- }
- jsonString = new String(outputStream.toByteArray(), encode);
- inputStream.close();
- return jsonString;
- }
- }
3.MainActivity.java
- package com.android.mygson;
- import java.io.Serializable;
- import java.util.List;
- import java.util.Map;
- import com.google.gson.Gson;
- import com.gson.data.Person;
- import com.gson.http.HttpUtils;
- import android.os.Bundle;
- import android.os.StrictMode;
- import android.annotation.SuppressLint;
- import android.app.Activity;
- import android.content.Intent;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import com.google.gson.reflect.TypeToken;
- ;
- public class MainActivity extends Activity implements OnClickListener {
- private Button person, persons, listString, listMap;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- closeStrictMode();
- // closeStrictMode(); //关闭严苛模式
- person = (Button) findViewById(R.id.person);
- persons = (Button) findViewById(R.id.persons);
- listString = (Button) findViewById(R.id.listString);
- listMap = (Button) findViewById(R.id.listMap);
- person.setOnClickListener(this);
- persons.setOnClickListener(this);
- listString.setOnClickListener(this);
- listMap.setOnClickListener(this);
- }
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- switch (v.getId()) {
- case R.id.person:
- String url_path = "http://192.168.0.102:8080/gsonProject/servlet/GsonAction?action_flag=person";
- String jsonString = HttpUtils.getJsonContent(url_path, "utf-8");
- Gson gson = new Gson();
- Person person = gson.fromJson(jsonString, Person.class);
- Intent intent = new Intent(MainActivity.this, OtherActivity.class);
- intent.putExtra("click_flag", "person");
- intent.putExtra("person", (Serializable) person);
- startActivity(intent);
- // Log.i(TAG, person.toString());
- break;
- case R.id.persons:
- String url_path2 = "http://192.168.0.102:8080/gsonProject/servlet/GsonAction?action_flag=persons";
- String jsonString2 = HttpUtils.getJsonContent(url_path2, "utf-8");
- Gson gson2 = new Gson();
- // 用GSON 将json字符串转换成 List<Person>
- List<Person> listPerson = gson2.fromJson(jsonString2,new TypeToken<List<Person>>(){}.getType());
- Intent intent2 = new Intent(MainActivity.this, OtherActivity.class);
- intent2.putExtra("click_flag", "persons");
- intent2.putExtra("persons", (Serializable) listPerson); // 用Intent传递 List<Person>数据类型
- startActivity(intent2);
- break;
- case R.id.listString:
- String url_path3 = "http://192.168.0.102:8080/gsonProject/servlet/GsonAction?action_flag=listString";
- String jsonString3 = HttpUtils.getJsonContent(url_path3, "utf-8");
- Gson gson3 = new Gson();
- // 用GSON 将json字符串转换成 List<String>
- List<String> listString = gson3.fromJson(jsonString3,new TypeToken<List<String>>(){}.getType());
- Intent intent3 = new Intent(MainActivity.this, OtherActivity.class);
- intent3.putExtra("click_flag", "listString");
- intent3.putExtra("listString", (Serializable) listString); // 用Intent传递 List<Person>数据类型
- startActivity(intent3);
- break;
- case R.id.listMap:
- String url_path4 = "http://192.168.0.102:8080/gsonProject/servlet/GsonAction?action_flag=listMap";
- String jsonString4 = HttpUtils.getJsonContent(url_path4, "utf-8");
- Gson gson4 = new Gson();
- // 用GSON 将json字符串转换成 List<Map<String,Object>>
- List<Map<String, Object>> listMap = gson4.fromJson(jsonString4, new TypeToken<List<Map<String, Object>>>() {}.getType());
- Intent intent4 = new Intent(MainActivity.this, OtherActivity.class);
- intent4.putExtra("click_flag", "listMap");
- intent4.putExtra("listMap", (Serializable) listMap); // 用Intent传递 List<Map<Sting,Object>>数据类型
- intent4.putExtra("jsonString", jsonString4);
- startActivity(intent4);
- break;
- }
- }
- @SuppressLint("NewApi")
- public static void closeStrictMode() {
- StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
- .detectAll().penaltyLog().build());
- }
- }
4.OtherActvity.java
- package com.android.mygson;
- import java.util.List;
- import java.util.Map;
- import com.gson.data.Person;
- import android.R.integer;
- import android.app.Activity;
- import android.content.Intent;
- import android.os.Bundle;
- import android.widget.TextView;
- public class OtherActivity extends Activity {
- private TextView textView;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_other);
- textView = (TextView) findViewById(R.id.msg);
- Intent intent = getIntent();
- String click_flag = intent.getStringExtra("click_flag");
- if ("person".equals(click_flag)) { // 如果是点击 person按钮
- // 接收Intent传递的Person对象
- Person person =(Person) intent.getSerializableExtra("person");
- textView.setText(person.toString());
- } else if ("persons".equals(click_flag)) {// 如果是点击 persons按钮
- // 接收Intent传递的List<Person>参数
- @SuppressWarnings("unchecked")
- List<Person> list = (List<Person>) intent
- .getSerializableExtra("persons");
- String persons = "";
- for (Person person : list) {
- persons += person.toString() + "\n";
- }
- textView.setText(persons);
- }else if ("listString".equals(click_flag)) {
- List<String> list = (List<String>) intent
- .getStringArrayListExtra("listString");
- String listString = "";
- for (String s : list) {
- listString += s + "\n";
- }
- textView.setText(listString);
- } else if ("listMap".equals(click_flag)) {
- //接收Intent传递的List<Map<String,Object>>参数
- @SuppressWarnings("unchecked")
- List<Map<String, Object>> list = (List<Map<String, Object>>) intent
- .getSerializableExtra("listMap");
- String listMapString = "";
- for (Map<String, Object> map : list) {
- // 遍历一个Map
- for (Map.Entry<String, Object> entry : map.entrySet()) {
- String key = entry.getKey();
- Object value = entry.getValue();
- listMapString += " " + key + " : " + value + " ";
- }
- listMapString += "\n";
- }
- textView.setText(listMapString+intent.getStringExtra("jsonString"));
- }
- }
- }
5.AndroidManifest.xml
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="com.android.mygson"
- android:versionCode="1"
- android:versionName="1.0" >
- <uses-sdk
- android:minSdkVersion="8"
- android:targetSdkVersion="19" />
- <!-- 添加访问网络的授权 -->
- <span style="color:#ff0000;"><uses-permission android:name="android.permission.INTERNET" /></span>
- <application
- android:allowBackup="true"
- android:icon="@drawable/ic_launcher"
- android:label="@string/app_name"
- android:theme="@style/AppTheme" >
- <activity
- android:name="com.android.mygson.MainActivity"
- android:label="@string/app_name" >
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
- <span style="color:#ff0000;"><activity android:name=".OtherActivity"></activity></span>
- </application>
- </manifest>
6.activity_main.xml
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical">
- <Button
- android:id="@+id/person"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="解析Person数据" />
- <Button
- android:id="@+id/persons"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="解析Persons数据" />
- <Button
- android:id="@+id/listString"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="解析listString数据" />
- <Button
- android:id="@+id/listMap"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="解析listMap数据" />
- </LinearLayout>
7.activity_other.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical" >
- <TextView
- android:id="@+id/msg"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- />
- </LinearLayout>
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