比起XML文件解析，JSON數據解析的有點在于他的體積小，在網絡上傳輸的時候可以更省流量。同時它也有缺點，Json數據的語義性較差，看起來沒有XML直觀。現在JSON已經被大多數開發人員所接受，在網絡數據的傳輸當中應用非常廣泛。現在做的項目需要把數據轉換成下面的格式：

{"PatitentData":[{"patient_mhistory":"高血壓","patient_insomnia":"六個月","patient_gender":"男","patient_name":"張三","current_date":"2015.4.10","patient_phone":"1243543546","patient_scde":"大學本科","patient_age":"56","patient_postion":"農民"}],"sleepDiary":[{"day07":"1243535","day06":"12324343","day05":"1243434","day04":"2435434521","day01":"121422343","day02":"1231421454","day03":"1243243"}],"testData":[{"isi":"12324324","hama":"122543543","hamd":"2334255","sleepness":"1243345432","pqsi":"124332144452"}]}
首先建立?PatientInformation.java、PatientTest.java和SleepDiary這三個類，主要是用來封裝一些信息

PatientInformation.java

package com.zghaikun.json;public class PatientInformation {private int id;private String patient_name;private String patient_gender;private String patient_age;private String patient_postion;private String patient_scde;private String patient_insomnia;private String patient_mhistory;private String patient_phone;private String current_date;private int patient_hamd;public PatientInformation() {super();}public PatientInformation(int patient_hamd) {super();this.patient_hamd = patient_hamd;}public PatientInformation( String current_date,String patient_name, String patient_gender,String patient_age, String patient_postion, String patient_scde,String patient_insomnia, String patient_mhistory,String patient_phone) {super();this.current_date = current_date;this.patient_name = patient_name;this.patient_gender = patient_gender;this.patient_age = patient_age;this.patient_postion = patient_postion;this.patient_scde = patient_scde;this.patient_insomnia = patient_insomnia;this.patient_mhistory = patient_mhistory;this.patient_phone = patient_phone;}public PatientInformation(int id, String current_date,String patient_name, String patient_gender,String patient_age, String patient_postion, String patient_scde,String patient_insomnia, String patient_mhistory,String patient_phone) {super();this.id = id;this.current_date = current_date;this.patient_name = patient_name;this.patient_gender = patient_gender;this.patient_age = patient_age;this.patient_postion = patient_postion;this.patient_scde = patient_scde;this.patient_insomnia = patient_insomnia;this.patient_mhistory = patient_mhistory;this.patient_phone = patient_phone;}public int getPatient_hamd() {return patient_hamd;}public void setPatient_hamd(int patient_hamd) {this.patient_hamd = patient_hamd;}public String getPatient_age() {return patient_age;}public void setPatient_age(String patient_age) {this.patient_age = patient_age;}public String getCurrentdate() {return current_date;}public void setCurrentdate(String currentdate) {this.current_date = currentdate;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getPatient_name() {return patient_name;}public void setPatient_name(String patient_name) {this.patient_name = patient_name;}public String getPatient_gender() {return patient_gender;}public void setPatient_gender(String patient_gender) {this.patient_gender = patient_gender;}public String getPatient_postion() {return patient_postion;}public void setPatient_postion(String patient_postion) {this.patient_postion = patient_postion;}public String getPatient_scde() {return patient_scde;}public void setPatient_scde(String patient_scde) {this.patient_scde = patient_scde;}public String getPatient_insomnia() {return patient_insomnia;}public void setPatient_insomnia(String patient_insomnia) {this.patient_insomnia = patient_insomnia;}public String getPatient_mhistory() {return patient_mhistory;}public void setPatient_mhistory(String patient_mhistory) {this.patient_mhistory = patient_mhistory;}public String getPatient_phone() {return patient_phone;}public void setPatient_phone(String patient_phone) {this.patient_phone = patient_phone;} } PatientTest.java

package com.zghaikun.json;public class PatientTest {int id;String pqsi;String sleepness;String hama;String hamd;String isi;public String getIsi() {return isi;}public void setIsi(String isi) {this.isi = isi;}public PatientTest() {super();}public PatientTest(int id, String pqsi, String sleepness, String hama,String hamd,String isi) {super();this.id = id;this.pqsi = pqsi;this.sleepness = sleepness;this.hama = hama;this.hamd = hamd;this.isi = isi;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getPqsi() {return pqsi;}public void setPqsi(String pqsi) {this.pqsi = pqsi;}public String getSleepness() {return sleepness;}public void setSleepness(String sleepness) {this.sleepness = sleepness;}public String getHama() {return hama;}public void setHama(String hama) {this.hama = hama;}public String getHamd() {return hamd;}public void setHamd(String hamd) {this.hamd = hamd;}} SleepDiary.java

package com.zghaikun.json;public class SleepDiary {private int id;private String day01;private String day02;private String day03;private String day04;private String day05;private String day06;private String day07;public SleepDiary(String day01, String day02, String day03, String day04,String day05, String day06, String day07) {super();this.day01 = day01;this.day02 = day02;this.day03 = day03;this.day04 = day04;this.day05 = day05;this.day06 = day06;this.day07 = day07;}public SleepDiary(int id, String day01, String day02, String day03,String day04, String day05, String day06, String day07) {super();this.id = id;this.day01 = day01;this.day02 = day02;this.day03 = day03;this.day04 = day04;this.day05 = day05;this.day06 = day06;this.day07 = day07;}public SleepDiary() {super();}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getDay01() {return day01;}public void setDay01(String day01) {this.day01 = day01;}public String getDay02() {return day02;}public void setDay02(String day02) {this.day02 = day02;}public String getDay03() {return day03;}public void setDay03(String day03) {this.day03 = day03;}public String getDay04() {return day04;}public void setDay04(String day04) {this.day04 = day04;}public String getDay05() {return day05;}public void setDay05(String day05) {this.day05 = day05;}public String getDay06() {return day06;}public void setDay06(String day06) {this.day06 = day06;}public String getDay07() {return day07;}public void setDay07(String day07) {this.day07 = day07;}} 一個布局文件，由兩個按鍵和一個textView組成，
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"><Buttonandroid:id="@+id/bt2" android:layout_width="match_parent"android:layout_height="wrap_content"android:text="把普通數據換成json數據格式的string"/><Buttonandroid:id="@+id/bt4" android:layout_width="match_parent"android:layout_height="wrap_content"android:text="解析帶集合的json字符串"/><TextViewandroid:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:gravity="center"android:textSize="30sp"android:text="@string/hello_world" /></LinearLayout> Mainactivity.java

package com.zghaikun.json;import java.util.ArrayList; import java.util.List;import org.apache.axis2.AxisFault; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject;import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private Button button1, button2, button3, button4; //4個按鈕private TextView textView; //顯示處理結果的textviewprivate List<PatientInformation> patientInfos; //保存數據的集合private List<PatientTest> patientTest;private List<SleepDiary> sleepDiarys;private JSONObject object; //JSONObject對象，處理一個一個的對象private JSONObject objPatientInfo;private JSONObject objTestData;private JSONObject objSleepDiary;private JSONArray jsonArrayPatientInfo;//JSONObject對象，處理一個一個集合或者數組private JSONArray jsonArrayTestData;//JSONObject對象，處理一個一個集合或者數組private JSONArray jsonArraySleepDiary;//JSONObject對象，處理一個一個集合或者數組private String jsonString; //保存帶集合的json字符串private String jsonString2;//不帶集合的json字符串@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView(); //初始化控件initDate(); //初始化數據setListener(); //綁定監事件// try { // SimpleServiceStub stub = new SimpleServiceStub(); // SimpleServiceStub.GetGreeting gg = new SimpleServiceStub.GetGreeting(); // gg.setParam0("比爾"); // System.out.println(stub.getGreeting(gg).local_return); // System.out.println(stub.getPrice().local_return); // } catch (Exception e) { // // TODO Auto-generated catch block // e.printStackTrace(); // }}private void initView() {// TODO Auto-generated method stubbutton2 = (Button) findViewById(R.id.bt2);button4 = (Button) findViewById(R.id.bt4);textView = (TextView) findViewById(R.id.text);}private void initDate() {//設置了兩個對象 patientInfos = new ArrayList<PatientInformation>();PatientInformation pateintInfo = new PatientInformation();pateintInfo.setPatient_name("張三");pateintInfo.setPatient_gender("男");pateintInfo.setPatient_age("56");pateintInfo.setPatient_postion("農民");pateintInfo.setPatient_scde("大學本科");pateintInfo.setPatient_insomnia("六個月");pateintInfo.setPatient_mhistory("高血壓");pateintInfo.setPatient_phone("1243543546");pateintInfo.setCurrentdate("2015.4.10");patientInfos.add(pateintInfo);//測試數據patientTest = new ArrayList<PatientTest>();PatientTest PatienData = new PatientTest();PatienData.setPqsi("124332144452");PatienData.setSleepness("1243345432");PatienData.setHama("122543543");PatienData.setHamd("2334255");PatienData.setIsi("12324324");patientTest.add(PatienData);sleepDiarys = new ArrayList<SleepDiary>();SleepDiary sleepDiary = new SleepDiary();sleepDiary.setDay01("121422343");sleepDiary.setDay02("1231421454");sleepDiary.setDay03("1243243");sleepDiary.setDay04("2435434521");sleepDiary.setDay05("1243434");sleepDiary.setDay06("12324343");sleepDiary.setDay07("1243535");sleepDiarys.add(sleepDiary);} // //綁定監聽器private void setListener() {button2.setOnClickListener(this);button4.setOnClickListener(this);}//把一個集合轉換成json格式的字符串private void changeArrayDateToJson() { jsonArrayPatientInfo = null;object = null;jsonArrayPatientInfo = new JSONArray();jsonArrayTestData = new JSONArray();jsonArraySleepDiary = new JSONArray();object = new JSONObject();//遍歷上面初始化的集合數據，把數據加入JSONObject里面for (int i = 0; i < patientInfos.size(); i++) { //一個user對象，使用一個JSONObject對象來裝objPatientInfo = new JSONObject();try {//從集合取出數據，放入JSONObject里面 JSONObject對象和map差不多用法,以鍵和值形式存儲數據objPatientInfo.put("patient_name", patientInfos.get(i).getPatient_name()); objPatientInfo.put("patient_gender", patientInfos.get(i).getPatient_gender());objPatientInfo.put("patient_age", patientInfos.get(i).getPatient_age());objPatientInfo.put("patient_postion", patientInfos.get(i).getPatient_postion());objPatientInfo.put("patient_scde", patientInfos.get(i).getPatient_scde());objPatientInfo.put("patient_insomnia", patientInfos.get(i).getPatient_insomnia());objPatientInfo.put("patient_mhistory", patientInfos.get(i).getPatient_mhistory());objPatientInfo.put("patient_phone", patientInfos.get(i).getPatient_phone());objPatientInfo.put("current_date", patientInfos.get(i).getCurrentdate());//把JSONObject對象裝入jsonArray數組里面jsonArrayPatientInfo.put(objPatientInfo); } catch (JSONException e) {e.printStackTrace();}}for(int i = 0 ; i < patientTest.size(); i++){//測試對象，使用JSONObjectobjTestData = new JSONObject();try {objTestData.put("pqsi", patientTest.get(i).getPqsi());objTestData.put("sleepness", patientTest.get(i).getSleepness());objTestData.put("hama", patientTest.get(i).getHama());objTestData.put("hamd", patientTest.get(i).getHamd());objTestData.put("isi", patientTest.get(i).getIsi());//把JSONObject對象裝入jsonArray數組里面jsonArrayTestData.put(objTestData);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}}for(int i = 0 ; i < sleepDiarys.size(); i++){//測試對象，使用JSONObjectobjSleepDiary = new JSONObject();try {objSleepDiary.put("day01", sleepDiarys.get(i).getDay01());objSleepDiary.put("day02", sleepDiarys.get(i).getDay02());objSleepDiary.put("day03", sleepDiarys.get(i).getDay03());objSleepDiary.put("day04", sleepDiarys.get(i).getDay04());objSleepDiary.put("day05", sleepDiarys.get(i).getDay05());objSleepDiary.put("day06", sleepDiarys.get(i).getDay06());objSleepDiary.put("day07", sleepDiarys.get(i).getDay07());//把JSONObject對象裝入jsonArray數組里面jsonArraySleepDiary.put(objSleepDiary);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}}try {//再把JSONArray數據加入JSONObject對象里面(數組也是對象)object.put("PatitentData", jsonArrayPatientInfo);object.put("testData", jsonArrayTestData);object.put("sleepDiary", jsonArraySleepDiary);//object.put("time", "2013-11-14"); //這里還可以加入數據，這樣json型字符串，就既有集合，又有普通數據} catch (JSONException e) {e.printStackTrace();}jsonString = null;//把JSONObject轉換成json格式的字符串jsonString = object.toString(); textView.setText(jsonString);Log.i("輸出json字符串", "轉換成json字符串: " + jsonString);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.bt2:changeArrayDateToJson(); //點擊第2個按鈕，把普通數據換成json數據格式的stringbreak;case R.id.bt4://解析帶集合的json字符串if (jsonString==null || "".equals(jsonString)) {Toast.makeText(MainActivity.this, "請先點擊第2按鈕把數據換成json字符串", Toast.LENGTH_LONG).show();return;}changeJsonToData1();break;default:break;}}//解析帶集合的json字符串private void changeJsonToData1(){//用來保存解析出來的數據，顯示在textviewStringBuilder stringBuilder = new StringBuilder(); StringBuilder stringBuilder2 = new StringBuilder(); StringBuilder stringBuilder3 = new StringBuilder(); PatientInformation patient;PatientTest patientTest;SleepDiary sleepDiary;List<PatientInformation> pInfoList=new ArrayList<PatientInformation>();List<PatientTest> pTestList = new ArrayList<PatientTest>();List<SleepDiary> sleepList = new ArrayList<SleepDiary>();try {object = new JSONObject(jsonString); jsonArrayPatientInfo = object.getJSONArray("PatitentData"); //通過key，獲取JSONObject里面的一個JSONArray數組jsonArrayTestData = object.getJSONArray("testData");jsonArraySleepDiary = object.getJSONArray("sleepDiary");for (int i = 0; i < jsonArrayPatientInfo.length(); i++) { //遍歷數據object = jsonArrayPatientInfo.getJSONObject(i); //從JSONArray里面獲取一個JSONObject對象patient = new PatientInformation();patient.setPatient_name(object.getString("patient_name"));patient.setPatient_gender(object.getString("patient_gender"));patient.setPatient_age(object.getString("patient_age"));patient.setPatient_postion(object.getString("patient_postion"));patient.setPatient_scde(object.getString("patient_scde"));patient.setPatient_insomnia(object.getString("patient_insomnia"));patient.setPatient_mhistory(object.getString("patient_mhistory"));patient.setPatient_phone(object.getString("patient_phone"));patient.setCurrentdate(object.getString("current_date"));pInfoList.add(patient);}} catch (JSONException e) {e.printStackTrace();}for (int i = 0; i < pInfoList.size(); i++) {stringBuilder.append("患者姓名:"+pInfoList.get(i).getPatient_name()).append(" ").append("患者年齡:" + pInfoList.get(i).getPatient_age()).append(" ").append("性別：" + pInfoList.get(i).getPatient_gender()).append(" ").append("職業：" + pInfoList.get(i).getPatient_postion()).append(" ").append("學歷：" + pInfoList.get(i).getPatient_scde()).append(" ").append("失眠時間：" + pInfoList.get(i).getPatient_insomnia()).append(" ").append("既往病史： " + pInfoList.get(i).getPatient_mhistory()).append(" ").append("聯系方式：" + pInfoList.get(i).getPatient_phone()).append(" ").append("測試時間 ：" + pInfoList.get(i).getCurrentdate());}for(int i = 0;i < jsonArrayTestData.length();i++){try {object = jsonArrayTestData.getJSONObject(i);patientTest = new PatientTest();patientTest.setPqsi(object.getString("pqsi"));patientTest.setSleepness(object.getString("sleepness"));patientTest.setHama(object.getString("hama"));patientTest.setHamd(object.getString("hamd"));patientTest.setIsi(object.getString("isi"));pTestList.add(patientTest);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();} }for (int i = 0; i < pTestList.size(); i++) {stringBuilder2.append("pqsi:"+pTestList.get(i).getPqsi()).append(" ").append("sleepness:" + pTestList.get(i).getSleepness()).append(" ").append("hama" + pTestList.get(i).getHama()).append(" ").append("hamd：" + pTestList.get(i).getHamd()).append(" ").append("isi：" + pTestList.get(i).getIsi());}System.out.println("111111111111111111111111111");for(int i = 0;i < jsonArraySleepDiary.length();i++){try {object = jsonArraySleepDiary.getJSONObject(i);System.out.println("22222222" + object);sleepDiary = new SleepDiary();sleepDiary.setDay01(object.getString("day01"));sleepDiary.setDay02(object.getString("day02"));sleepDiary.setDay03(object.getString("day03"));sleepDiary.setDay04(object.getString("day04"));sleepDiary.setDay05(object.getString("day05"));sleepDiary.setDay06(object.getString("day06"));sleepDiary.setDay07(object.getString("day07"));sleepList.add(sleepDiary);System.out.println("2222222222222222222222222");} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();} }for (int i = 0; i < sleepList.size(); i++) {stringBuilder3.append("day01:"+sleepList.get(i).getDay01()).append(" ").append("day02:" + sleepList.get(i).getDay02()).append(" ").append("day03" + sleepList.get(i).getDay03()).append(" ").append("day04：" + sleepList.get(i).getDay04()).append(" ").append("day05：" + sleepList.get(i).getDay05()).append(" ").append("day06：" + sleepList.get(i).getDay06()).append(" ").append("day07：" + sleepList.get(i).getDay07());}textView.setText(stringBuilder.toString() + "\n" + stringBuilder2.toString() + "\n" + stringBuilder3);} }
程序中先通過initDate()方法設置數據，再通過changeArrayDateToJson()函數將數據轉換成json數據格式，轉換后再通過changeJsonToData1()方法吧json數據轉換成普通的數據，然后在進行下一步的操作。

總結

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