DBMNG数据库管理与应用

所谓独创的能力，就是经过深思的模仿。

目录 / 分类

数据库基础
Access
SQLServer
MySQL
SQLite
Oracle
PostgreSQL
移动应用
经验分享
服务器配置
网文摘录
下载中心
CUBRID数据库
验证/二维/条形码
当前位置：首页 > 经验分享 > Java组件

fastjson生成和解析json数据

1. fastjson生成和解析json数据

  (举例：4种常用类型:JavaBean,List<JavaBean>,List<String>,List<Map<String,Object>)

2.通过一个android程序测试fastjson的用法。

fastjson简介：

Fastjson是一个Java语言编写的高性能功能完善的JSON库。fastjson采用独创的算法，将parse的速度提升到极致，超过所有json库，包括曾经号称最快的jackson。并且还超越了google的二进制协议protocol buf。Fastjson完全支持 http://json.org 的标准，也是官方网站收录的参考实现之一。支持各种JDK类型。包括基本类型、JavaBean、Collection、Map、Enum、泛型等。支持JDK 5、JDK 6、Android、阿里云手机等环境。

一. fastjson生成json字符串(JavaBean,List<JavaBean>,List<String>,List<Map<String,Object>)

     String jsonStrng = JSON.toJSONString(object);

二. fastjson 解析json字符串为四种类型

      1. JavaBean

          Person person = JSON.parseObject(jsonString, Person.class);

      2. List<JavaBean>

          List<Person> listPerson =JSON.parseArray(jsonString, Person.class);

      3. List<String>

          List<String> listString = JSON.parseArray(jsonString, String.class);

      4. List<Map<String,Object>>

          List<Map<String, Object>> listMap = JSON.parseObject(jsonString, new TypeReference<List<Map<String,Object>>>(){});  (注意：此处可看出fastjson反射机制比gson更准确， id = 1001 通过fastjson反射仍是 id = 1001 , 而通过gson反射结果 为 id =1001.0 ,参考前篇程序运行结果图 GSON方式生成和解析json数据 )

-----------------------------------------------------------------------------------------------------------------------------------------

程序运行结果：

1. 点击“解析Person数据”按钮

2. 点击“解析Persons数据按钮”

3.点击“解析listString数据”按钮

4.点击“解析listMap数据”按钮

--------------------------------------------------------------------------------------------------------------------------------------

客户端eclipse android工程目录（左边）服务器端myeclipse web工程（右边）

    

---------------------------------------------------------------------------------------------------------------------------------------

服务器端 fastjson_Project

1.FastJsonAction.java 

package com.fastjson.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.fastjson.service.FastJsonService; import com.fastjson.tools.*; public class FastJsonAction 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());    String person = FastJsonTools.createJsonString(FastJsonService.getPerson());    out.println(person);    System.out.println(person);       } else if("persons".equals(action_flag)) {  //		String persons = GsonTools.creatJsonString(GsonService.getListPersons());    String persons = FastJsonTools.createJsonString(FastJsonService.getListPersons());    out.println(persons);    System.out.println(persons);   }else if("listString".equals(action_flag)) {   //	String listString = GsonTools.creatJsonString(GsonService.getListString());    String listString = FastJsonTools.createJsonString(FastJsonService.getListString());    out.println(listString);    System.out.println(listString);   }else if("listMap".equals(action_flag)) {   //	String listMap = GsonTools.creatJsonString(GsonService.getListMap());    String listMap = FastJsonTools.createJsonString(FastJsonService.getListMap());    out.println(listMap);    System.out.println(listMap);   }      System.out.println();      out.flush();   out.close();  }  /**   * Initialization of the servlet. <br>   *   * @throws ServletException if an error occurs   */  public void init() throws ServletException {   // Put your code here  }
}

2.FastJsonService.java 

package com.fastjson.service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.fastjson.data.Person; public class FastJsonService {  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.FastJsonTools.java 

package com.fastjson.tools; import com.alibaba.fastjson.*; public class FastJsonTools {  public static String createJsonString(Object object){   String jsonString = "";   try {    jsonString = JSON.toJSONString(object);   } catch (Exception e) {    // TODO: handle exception   }      return jsonString;  }
}

4.Person.java 

package com.fastjson.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     + "]";  }   }

5. TestFastJson.java 

package com.fastjson.test; import com.fastjson.service.FastJsonService; import com.fastjson.tools.FastJsonTools; public class TestFastJson {  /**   * @param args   */  public static void main(String[] args) {   // TODO Auto-generated method stub   //Test1 Person    System.out.println("FastJson数据格式测试结果：\n");   String person = FastJsonTools.createJsonString(FastJsonService.getPerson());   //Test2 persons   String listPerson =  FastJsonTools.createJsonString(FastJsonService.getListPersons());   //Test3 listString   String listString =  FastJsonTools.createJsonString(FastJsonService.getListString()) ;   //Test 4 listMap   String listMap = FastJsonTools.createJsonString(FastJsonService.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：android_fastjson

1.MainActivity.java 

package com.android.mygson; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.Serializable; import java.net.HttpURLConnection; import java.net.URL; import java.util.List; import java.util.Map; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.TypeReference; import com.fastjson.tools.FastJsonTools; 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; 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();//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/fastjson_Project/servlet/FastJsonAction?action_flag=person";    String jsonString = HttpUtils.getJsonContent(url_path, "utf-8");    Person person = FastJsonTools.getPerson(jsonString, Person.class);    //用fastJson技术解析json字符串，转换为Person对象  //		Person person = JSON.parseObject(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/fastjson_Project/servlet/FastJsonAction?action_flag=persons";    String jsonString2 = HttpUtils.getJsonContent(url_path2, "utf-8");        // 用fastjson 将json字符串转换成 List<Person>  //		List<Person> listPerson =JSON.parseArray(jsonString2, Person.class);    List<Person> listPerson =FastJsonTools.getPersons(jsonString2, Person.class);    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/fastjson_Project/servlet/FastJsonAction?action_flag=listString";    String jsonString3 = HttpUtils.getJsonContent(url_path3, "utf-8");        // 用fastjson 将json字符串转换成 List<String>  //		List<String> listString = JSON.parseArray(jsonString3, String.class);    List<String> listString = FastJsonTools.getPersons(jsonString3,String.class);    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/fastjson_Project/servlet/FastJsonAction?action_flag=listMap";    String jsonString4 = HttpUtils.getJsonContent(url_path4, "utf-8");        // 用fastjson 将json字符串转换成 List<Map<String,Object>>    //	List<Map<String, Object>> listMap = JSON.parseObject(jsonString4, new TypeReference<List<Map<String,Object>>>(){});    List<Map<String, Object>> listMap = FastJsonTools.getListMap(jsonString4);    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());  }    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;  }

}

2.OtherActivity.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());      //		textView.setText("test :"+intent.getStringExtra("test"));       } 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"));   }     }

}

3.FastJsonTools.java 

package com.fastjson.tools; import java.util.ArrayList; import java.util.List; import java.util.Map; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.TypeReference; public class FastJsonTools {  /**   * 用fastjson 将json字符串解析为一个 JavaBean   *   * @param jsonString   * @param cls   * @return   */  public static <T> T getPerson(String jsonString, Class<T> cls) {   T t = null;   try {    t = JSON.parseObject(jsonString, cls);   } catch (Exception e) {    // TODO: handle exception    e.printStackTrace();   }   return t;  }  /**   * 用fastjson 将json字符串 解析成为一个 List<JavaBean> 及 List<String>   *   * @param jsonString   * @param cls   * @return   */  public static <T> List<T> getPersons(String jsonString, Class<T> cls) {   List<T> list = new ArrayList<T>();   try {    list = JSON.parseArray(jsonString, cls);   } catch (Exception e) {    // TODO: handle exception   }   return list;  }  /**   * 用fastjson 将jsonString 解析成 List<Map<String,Object>>   *   * @param jsonString   * @return   */  public static List<Map<String, Object>> getListMap(String jsonString) {   List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();   try {    // 两种写法    // list = JSON.parseObject(jsonString, new    // TypeReference<List<Map<String, Object>>>(){}.getType());    list = JSON.parseObject(jsonString,      new TypeReference<List<Map<String, Object>>>() {      });   } catch (Exception e) {    // TODO: handle exception   }   return list;  }

}

4.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     + "]";  }   }

5.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;  }   }

6.activity_matin.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>

8.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 -->  <uses-permission android:name="android.permission.INTERNET" />    <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>   <activity android:name=".OtherActivity"></activity>  </application> </manifest>


-----------------------------------------------------------------------------------------------------------------

注意一点：

泛型方法

客户端：FastJsonToos.java 泛型方法的写法。

上一篇：用于处理JSP页面布局的开源项目
下一篇：FastJson简单使用
本站文章内容，部分来自于互联网，若侵犯了您的权益，请致邮件chuanghui423#sohu.com(请将#换为@)联系，我们会尽快核实后删除。
Copyright © 2006-2023 DBMNG.COM All Rights Reserved. Powered by DEVSOARTECH            豫ICP备11002312号-2

豫公网安备 41010502002439号