Java代码
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Iterator;
/*
* 将pojo对象的属性值提取出来，组成json格式的数据
* 当前版本只能对最基本的pojo对象进行转化，类似于下面的格式：
public class Pojo {
private String name;
private int age;
public int getAge() {
return age;
}
public String getName() {
return name;
}
public void setAge(int age) {
this.age = age;
}
public void setName(String name) {
this.name = name;
}
}
* 单个对象返回{'name':age}格式；集合对象返回{'name':age},{'name':age}...
*
* author：scriptguy
* date： 2010/04/06
*/
public class JsonUtil {
/*
** 暴露出来的方法，传入需要将属性值转换为json数据格式的pojo
** 会抛出IllegalAccessException异常，需要捕捉
*/
public static String toJson(Object obj) throws IllegalAccessException{
Class cla = obj.getClass();
Field[] fields = cla.getDeclaredFields();
String[] names = fieldToNames(fields);
Object[] values = fieldToValues(fields,obj);
String json = produceToJson(names,values);
return json;
}
private static String[] fieldToNames(Field[] fields) {
String[] names = new String[fields.length];
for(int i = 0;i < fields.length;i++) {
fields[i].setAccessible(true);//将此对象的 accessible 标志设置为可以读取
names[i] = fields[i].getName();
}
return names;
}
private static Object[] fieldToValues(Field[] fields,Object obj) throws IllegalAccessException{
Object[] values = new Object[fields.length];
for(int i = 0;i < fields.length;i++) {
values[i] = fields[i].get(obj);
}
return values;
}
private static String produceToJson(String[] names,Object[] values) {
if(names.length != values.length) {
new RuntimeException("转化json数据出错！！！");
}
StringBuilder json = new StringBuilder();
json.append("{");
for(int i = 0;i < names.length;i++) {
json.append("'");
json.append(names[i]);
json.append("':");
processFieldValue(values[i],json);
if(i < names.length - 1) {
json.append(",");
}
}
json.append("}");
return json.toString();
}
private static void processFieldValue(Object obj,StringBuilder json) {
if(obj instanceof Number) {
json.append(obj);
} else {
json.append("'");
json.append(obj);
json.append("'");
}
}
public static String allToJson(Collection coll) throws IllegalAccessException{
Iterator iterator = coll.iterator();
StringBuilder json = new StringBuilder();
Object obj;
while(iterator.hasNext()) {
obj = iterator.next();
json.append(toJson(obj));
json.append(",");
}
int delete = json.lastIndexOf(",");
json = json.deleteCharAt(delete);
return json.toString();
}
/*
**
*/
}
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Iterator;
/*
* 将pojo对象的属性值提取出来，组成json格式的数据
* 当前版本只能对最基本的pojo对象进行转化，类似于下面的格式：
public class Pojo {
private String name;
private int age;
public int getAge() {
return age;
}
public String getName() {
return name;
}
public void setAge(int age) {
this.age = age;
}
public void setName(String name) {
this.name = name;
}
}
* 单个对象返回{'name':age}格式；集合对象返回{'name':age},{'name':age}...
*
* author：scriptguy
* date： 2010/04/06
*/
public class JsonUtil {
/*
** 暴露出来的方法，传入需要将属性值转换为json数据格式的pojo
** 会抛出IllegalAccessException异常，需要捕捉
*/
public static String toJson(Object obj) throws IllegalAccessException{
Class cla = obj.getClass();
Field[] fields = cla.getDeclaredFields();
String[] names = fieldToNames(fields);
Object[] values = fieldToValues(fields,obj);
String json = produceToJson(names,values);
return json;
}
private static String[] fieldToNames(Field[] fields) {
String[] names = new String[fields.length];
for(int i = 0;i < fields.length;i++) {
fields[i].setAccessible(true);//将此对象的 accessible 标志设置为可以读取
names[i] = fields[i].getName();
}
return names;
}
private static Object[] fieldToValues(Field[] fields,Object obj) throws IllegalAccessException{
Object[] values = new Object[fields.length];
for(int i = 0;i < fields.length;i++) {
values[i] = fields[i].get(obj);
}
return values;
}
private static String produceToJson(String[] names,Object[] values) {
if(names.length != values.length) {
new RuntimeException("转化json数据出错！！！");
}
StringBuilder json = new StringBuilder();
json.append("{");
for(int i = 0;i < names.length;i++) {
json.append("'");
json.append(names[i]);
json.append("':");
processFieldValue(values[i],json);
if(i < names.length - 1) {
json.append(",");
}
}
json.append("}");
return json.toString();
}
private static void processFieldValue(Object obj,StringBuilder json) {
if(obj instanceof Number) {
json.append(obj);
} else {
json.append("'");
json.append(obj);
json.append("'");
}
}
public static String allToJson(Collection coll) throws IllegalAccessException{
Iterator iterator = coll.iterator();
StringBuilder json = new StringBuilder();
Object obj;
while(iterator.hasNext()) {
obj = iterator.next();
json.append(toJson(obj));
json.append(",");
}
int delete = json.lastIndexOf(",");
json = json.deleteCharAt(delete);
return json.toString();
}
/*
**
*/
}
测试代码：
Java代码
import java.util.Collection;
import java.util.*;
public class TestJsonUtil {
public static void main(String[] args) throws Exception{
Pojo pojo1 = new Pojo("list",23);
Pojo pojo = new Pojo("scriptguy",22);
List<Object> lista = new ArrayList<Object>();
lista.add(pojo1);
lista.add(pojo);
System.out.println(JsonUtil.allToJson(lista));
}
}
import java.util.Collection;
import java.util.*;
public class TestJsonUtil {
public static void main(String[] args) throws Exception{
Pojo pojo1 = new Pojo("list",23);
Pojo pojo = new Pojo("scriptguy",22);
List<Object> lista = new ArrayList<Object>();
lista.add(pojo1);
lista.add(pojo);
System.out.println(JsonUtil.allToJson(lista));
}
}
结果：
{'name':'list','age':23},{'name':'scriptguy','age':22}
-------------------------
前面我有用到android发送json数据；这里我想总结一下我用到的解析json数据格式的方式
json数据格式解析我自己分为两种；
一种是普通的，一种是带有数组形式的；
普通形式的：
服务器端返回的json数据格式如下：
{"userbean":{"Uid":"100196","Showname":"\u75af\u72c2\u7684\u7334\u5b50","Avtar":null,"State":1}}
分析代码如下：
// TODO 状态处理 500 200
int res = 0;
res = httpClient.execute(httpPost).getStatusLine().getStatusCode();
if (res == 200) {
/*
* 当返回码为200时，做处理
* 得到服务器端返回json数据，并做处理
* */
HttpResponse httpResponse = httpClient.execute(httpPost);
StringBuilder builder = new StringBuilder();
BufferedReader bufferedReader2 = new BufferedReader(
new InputStreamReader(httpResponse.getEntity().getContent()));
String str2 = "";
for (String s = bufferedReader2.readLine(); s != null; s = bufferedReader2
.readLine()) {
builder.append(s);
}
Log.i("cat", ">>>>>>" + builder.toString());
JSONObject jsonObject = new JSONObject(builder.toString())
.getJSONObject("userbean");
String Uid;
String Showname;
String Avtar;
String State;
Uid = jsonObject.getString("Uid");
Showname = jsonObject.getString("Showname");
Avtar = jsonObject.getString("Avtar");
State = jsonObject.getString("State");
带数组形式的：
服务器端返回的数据格式为：
{"calendar":
{"calendarlist":
[
{"calendar_id":"1705","title":"(\u4eb2\u5b50)ddssd","category_name":"\u9ed8\u8ba4\u5206\u7c7b","showtime":"1288927800","endshowtime":"1288931400","allDay":false},
{"calendar_id":"1706","title":"(\u65c5\u884c)","category_name":"\u9ed8\u8ba4\u5206\u7c7b","showtime":"1288933200","endshowtime":"1288936800","allDay":false}
]
}
}
分析代码如下：
// TODO 状态处理 500 200
int res = 0;
res = httpClient.execute(httpPost).getStatusLine().getStatusCode();
if (res == 200) {
/*
* 当返回码为200时，做处理
* 得到服务器端返回json数据，并做处理
* */
HttpResponse httpResponse = httpClient.execute(httpPost);
StringBuilder builder = new StringBuilder();
BufferedReader bufferedReader2 = new BufferedReader(
new InputStreamReader(httpResponse.getEntity().getContent()));
String str2 = "";
for (String s = bufferedReader2.readLine(); s != null; s = bufferedReader2
.readLine()) {
builder.append(s);
}
Log.i("cat", ">>>>>>" + builder.toString());
/**
* 这里需要分析服务器回传的json格式数据，
*/
JSONObject jsonObject = new JSONObject(builder.toString())
.getJSONObject("calendar");
JSONArray jsonArray = jsonObject.getJSONArray("calendarlist");
for(int i=0;i<jsonArray.length();i++){
JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i);
CalendarInfo calendarInfo = new CalendarInfo();
calendarInfo.setCalendar_id(jsonObject2.getString("calendar_id"));
calendarInfo.setTitle(jsonObject2.getString("title"));
calendarInfo.setCategory_name(jsonObject2.getString("category_name"));
calendarInfo.setShowtime(jsonObject2.getString("showtime"));
calendarInfo.setEndtime(jsonObject2.getString("endshowtime"));
calendarInfo.setAllDay(jsonObject2.getBoolean("allDay"));
calendarInfos.add(calendarInfo);
}
总结，普通形式的只需用JSONObject ，带数组形式的需要使用JSONArray 将其变成一个list。