- 浏览: 332962 次
- 性别:
- 来自: 安徽
文章分类
最新评论
-
fanjf:
因为不是太懂,所以摘录!
DataStage---向目的库插入时出现问题:MLOG$ -
fanjf:
oracle 位图索引:位图索引: 解决某一表数据很多,但某一 ...
【转】 mysql 添加列,修改列,删除列。 -
fanjf:
创建索引:CREATE TABLE mm (m1 CHAR(1 ...
【转】 mysql 添加列,修改列,删除列。 -
fanjf:
查询mysql 的表emp 的约束:
SELECT * FR ...
【转】 mysql 添加列,修改列,删除列。 -
fanjf:
为什么 update 不报错,结果为空?
关于MYSQL 检查check约束
Json-lib可以将Java对象转成json格式的字符串,也可以将Java对象转换成xml格式的文档,同样可以将json字符串转换成Java对象或是将xml字符串转换成Java对象。
一、 准备工作
1、 首先要去官方下载json-lib工具包
下载地址:
http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-2.4/
目前最新的是2.4的版本,本示例中使用的是v2.3;json-lib还需要以下依赖包:
jakarta commons-lang 2.5
jakarta commons-beanutils 1.8.0
jakarta commons-collections 3.2.1
jakarta commons-logging 1.1.1
ezmorph 1.0.6
官方网址:http://json-lib.sourceforge.net/
然后在工程中添加如下jar包:
当然你也可以用2.4的json-lib库
你可以在这里看看官方提供的示例:
http://json-lib.sourceforge.net/usage.html
由于本次介绍的示例需要junit工具,所以你还需要添加junit的jar文件,版本是4.8.2版本的,下载地址:https://github.com/KentBeck/junit/downloads
如果你还不了解JSON是什么?那么你应该可以看看http://www.json.org/json-zh.html
2、 要转换的JavaBean的代码如下:
package com.hoo.entity;
public class Student {
private int id;
private String name;
private String email;
private String address;
private Birthday birthday;
//setter、getter
public String toString() {
return this .name + "#" + this .id + "#" + this .address + "#" + this .birthday + "#" + this .email;
}
}
Birthday.java
package com.hoo.entity;
public class Birthday {
private String birthday;
public Birthday(String birthday) {
super ();
this .birthday = birthday;
}
//setter、getter
public Birthday() {}
@Override
public String toString() {
return this .birthday;
}
}
注意,上面的getter、setter方法省略了,自己构建下。
3、 新建JsonlibTest测试类,基本代码如下:
package com.hoo.test;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import net.sf.json.JSON;
import net.sf.json.JSONArray;
import net.sf.json.JSONFunction;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
import net.sf.json.util.PropertyFilter;
import net.sf.json.xml.XMLSerializer;
import org.apache.commons.beanutils.PropertyUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.hoo.entity.Birthday;
import com.hoo.entity.Student;
/**
* <b>function:</b> 用json-lib转换java对象到JSON字符串
* 读取json字符串到java对象,序列化jsonObject到xml
* json-lib-version: json-lib-2.3-jdk15.jar
* 依赖包:
* commons-beanutils.jar
* commons-collections-3.2.jar
* ezmorph-1.0.3.jar
* commons-lang.jar
* commons-logging.jar
* @author hoojo
* @createDate Nov 28, 2010 2:28:39 PM
* @file JsonlibTest.java
* @package com.hoo.test
* @project WebHttpUtils
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
@SuppressWarnings({ "deprecation" , "unchecked" })
public class JsonlibTest {
private JSONArray jsonArray = null;
private JSONObject jsonObject = null;
private Student bean = null;
@Before
public void init() {
jsonArray = new JSONArray();
jsonObject = new JSONObject();
bean = new Student();
bean.setAddress("address" );
bean.setEmail("email" );
bean.setId(1);
bean.setName("haha" );
Birthday day = new Birthday();
day.setBirthday("2010-11-22" );
bean.setBirthday(day);
}
@After
public void destory() {
jsonArray = null;
jsonObject = null;
bean = null;
System.gc();
}
public final void fail(String string) {
System.out.println(string);
}
public final void failRed(String string) {
System.err.println(string);
}
}
上面的init会在每个方法之前运行,destory会在每个方法完成后执行。分别用到了junit的@Before、@After注解,如果你对junit的这些注解不是很了解,可以看看junit官方的测试用例的example和doc;
JSONObject是将Java对象转换成一个json的Object形式,JSONArray是将一个Java对象转换成json的Array格式。
那什么是json的Object形式、Array形式?
用通俗易懂的方法将,所谓的json的Object形式就是一个花括号里面存放的如JavaMap的键值对,如:{name:’hoojo’, age: 24};
那么json的Array形式呢?
就是中括号,括起来的数组。如:[ ‘json’, true, 22];
如果你还想了解更多json方面的知识,请看:http://www.json.org/json-zh.html
除了上面的JSONArray、JSONObject可以将Java对象转换成JSON或是相反,将JSON字符串转换成Java对象,还有一个对象也可以完成上面的功能,它就是JSONSerializer;下面我们就来看看它们是怎么玩转Java对象和JSON的。
二、 Java 对象序列化成 JSON 对象
1、 将JavaObject转换吃JSON字符串
在JsonlibTest中添加如下代码:
/*=========================Java Object >>>> JSON String ===========================*/
/**
* <b>function:</b>转Java Bean对象到JSON
* @author hoojo
* @createDate Nov 28, 2010 2:35:54 PM
*/
@Test
public void writeEntity2JSON() {
fail("==============Java Bean >>> JSON Object==================" );
fail(JSONObject.fromObject(bean).toString());
fail("==============Java Bean >>> JSON Array==================" );
fail(JSONArray.fromObject(bean).toString());//array会在最外层套上[]
fail("==============Java Bean >>> JSON Object ==================" );
fail(JSONSerializer.toJSON(bean).toString());
fail("========================JsonConfig========================" );
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Birthday.class , new JsonValueProcessor() {
public Object processArrayValue(Object value, JsonConfig jsonConfig) {
if (value == null) {
return new Date();
}
return value;
}
public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {
fail("key:" + key);
return value + "##修改过的日期" ;
}
});
jsonObject = JSONObject.fromObject(bean, jsonConfig);
fail(jsonObject.toString());
Student student = (Student) JSONObject.toBean(jsonObject, Student.class );
fail(jsonObject.getString("birthday" ));
fail(student.toString());
fail("#####################JsonPropertyFilter############################" );
jsonConfig.setJsonPropertyFilter(new PropertyFilter() {
public boolean apply(Object source, String name, Object value) {
fail(source + "%%%" + name + "--" + value);
//忽略birthday属性
if (value != null && Birthday.class .isAssignableFrom(value.getClass())) {
return true;
}
return false;
}
});
fail(JSONObject.fromObject(bean, jsonConfig).toString());
fail("#################JavaPropertyFilter##################" );
jsonConfig.setRootClass(Student.class );
jsonConfig.setJavaPropertyFilter(new PropertyFilter() {
public boolean apply(Object source, String name, Object value) {
fail(name + "@" + value + "#" + source);
if ("id" .equals(name) || "email" .equals(name)) {
value = name + "@@" ;
return true;
}
return false;
}
});
//jsonObject = JSONObject.fromObject(bean, jsonConfig);
//student = (Student) JSONObject.toBean(jsonObject, Student.class);
//fail(student.toString());
student = (Student) JSONObject.toBean(jsonObject, jsonConfig);
fail("Student:" + student.toString());
}
fromObject将Java对象转换成json字符串,toBean将json对象转换成Java对象;
上面方法值得注意的是使用了JsonConfig这个对象,这个对象可以在序列化的时候对JavaObject的数据进行处理、过滤等
上面的jsonConfig的registerJsonValueProcessor方法可以完成对象值的处理和修改,比如处理生日为null时, 给一个特定的值。同样setJsonPropertyFilter和setJavaPropertyFilter都是完成对转换后的值的处理。
运行上面的代码可以在控制台看到如下结果:
==============Java Bean >>> JSON Object==================
{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"haha" }
==============Java Bean >>> JSON Array==================
[{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"haha" }]
==============Java Bean >>> JSON Object ==================
{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"haha" }
========================JsonConfig========================
key:birthday
{"address" :"address" ,"birthday" :"2010-11-22##修改过的日期" ,"email" :"email" ,"id" :1,"name" :"haha" }
2010-11-22##修改过的日期
haha#1#address#null#email
#####################JsonPropertyFilter############################
haha#1#address#2010-11-22#email%%%address--address
haha#1#address#2010-11-22#email%%%birthday--2010-11-22
haha#1#address#2010-11-22#email%%%email--email
haha#1#address#2010-11-22#email%%%id--1
haha#1#address#2010-11-22#email%%%name--haha
{"address" :"address" ,"email" :"email" ,"id" :1,"name" :"haha" }
#################JavaPropertyFilter##################
address@address#null#0#null#null#null
birthday@2010-11-22##修改过的日期#null#0#address#null#null
email@email#null#0#address#null#null
id@1#null#0#address#null#null
name@haha#null#0#address#null#null
Student:haha#0#address#null#null
2、 将JavaList集合转换吃JSON字符串
/**
* <b>function:</b>转换Java List集合到JSON
* @author hoojo
* @createDate Nov 28, 2010 2:36:15 PM
*/
@Test
public void writeList2JSON() {
fail("==============Java List >>> JSON Array==================" );
List<Student> stu = new ArrayList<Student>();
stu.add(bean);
bean.setName("jack" );
stu.add(bean);
fail(JSONArray.fromObject(stu).toString());
fail(JSONSerializer.toJSON(stu).toString());
}
运行此方法后,可以看到控制台输出:
==============Java List >>> JSON Array==================
[{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },
{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" }]
[{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },
{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" }]
如果你是转换List集合,一定得用JSONArray或是JSONSrializer提供的序列化方法。如果你用 JSONObject.fromObject方法转换List会出现异常,通常使用JSONSrializer这个JSON序列化的方法,它会自动识别你 传递的对象的类型,然后转换成相应的JSON字符串。
3、 将Map集合转换成JSON对象
/**
* <b>function:</b>转Java Map对象到JSON
* @author hoojo
* @createDate Nov 28, 2010 2:37:35 PM
*/
@Test
public void writeMap2JSON() {
Map<String, Object> map = new HashMap<String, Object>();
map.put("A" , bean);
bean.setName("jack" );
map.put("B" , bean);
map.put("name" , "json" );
map.put("bool" , Boolean.TRUE);
map.put("int" , new Integer(1));
map.put("arr" , new String[] { "a" , "b" });
map.put("func" , "function(i){ return this.arr[i]; }" );
fail("==============Java Map >>> JSON Object==================" );
fail(JSONObject.fromObject(map).toString());
fail("==============Java Map >>> JSON Array ==================" );
fail(JSONArray.fromObject(map).toString());
fail("==============Java Map >>> JSON Object==================" );
fail(JSONSerializer.toJSON(map).toString());
}
上面的Map集合有JavaBean、String、Boolean、Integer、以及Array和js的function函数的字符串。
运行上面的程序,结果如下:
==============Java Map >>> JSON Object==================
{"arr" :["a" ,"b" ],"A" :{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },"int" :1,
"B" :{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },"name" :"json" ,
"func" :function(i){ return this .arr[i]; },"bool" :true}
==============Java Map >>> JSON Array ==================
[{"arr" :["a" ,"b" ],"A" :{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },"int" :1,
"B" :{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },"name" :"json" ,
"func" :function(i){ return this .arr[i]; },"bool" :true}]
==============Java Map >>> JSON Object==================
{"arr" :["a" ,"b" ],"A" :{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },"int" :1,
"B" :{"address" :"address" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email" ,"id" :1,"name" :"jack" },"name" :"json" ,
"func" :function(i){ return this .arr[i]; },"bool" :true}
4、 将更多类型转换成JSON
/**
* <b>function:</b> 转换更多数组类型到JSON
* @author hoojo
* @createDate Nov 28, 2010 2:39:19 PM
*/
@Test
public void writeObject2JSON() {
String[] sa = {"a" , "b" , "c" };
fail("==============Java StringArray >>> JSON Array ==================" );
fail(JSONArray.fromObject(sa).toString());
fail(JSONSerializer.toJSON(sa).toString());
fail("==============Java boolean Array >>> JSON Array ==================" );
boolean [] bo = { true, false, true };
fail(JSONArray.fromObject(bo).toString());
fail(JSONSerializer.toJSON(bo).toString());
Object[] o = { 1, "a" , true, 'A' , sa, bo };
fail("==============Java Object Array >>> JSON Array ==================" );
fail(JSONArray.fromObject(o).toString());
fail(JSONSerializer.toJSON(o).toString());
fail("==============Java String >>> JSON ==================" );
fail(JSONArray.fromObject("['json','is','easy']" ).toString());
fail(JSONObject.fromObject("{'json':'is easy'}" ).toString());
fail(JSONSerializer.toJSON("['json','is','easy']" ).toString());
fail("==============Java JSONObject >>> JSON ==================" );
jsonObject = new JSONObject()
.element("string" , "JSON" )
.element("integer" , "1" )
.element("double" , "2.0" )
.element("boolean" , "true" );
fail(JSONSerializer.toJSON(jsonObject).toString());
fail("==============Java JSONArray >>> JSON ==================" );
jsonArray = new JSONArray()
.element( "JSON" )
.element( "1" )
.element( "2.0" )
.element( "true" );
fail(JSONSerializer.toJSON(jsonArray).toString());
fail("==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================" );
List input = new ArrayList();
input.add("JSON" );
input.add("1" );
input.add("2.0" );
input.add("true" );
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );
Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);
System.out.println(output[0]);
fail("==============Java JSONFunction >>> JSON ==================" );
String str = "{'func': function( param ){ doSomethingWithParam(param); }}" ;
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(str);
JSONFunction func = (JSONFunction) jsonObject.get("func" );
fail(func.getParams()[0]);
fail(func.getText() );
}
运行后结果如下:
==============Java StringArray >>> JSON Array ==================
["a" ,"b" ,"c" ]
["a" ,"b" ,"c" ]
==============Java boolean Array >>> JSON Array ==================
[true,false,true]
[true,false,true]
==============Java Object Array >>> JSON Array ==================
[1,"a" ,true,"A" ,["a" ,"b" ,"c" ],[true,false,true]]
[1,"a" ,true,"A" ,["a" ,"b" ,"c" ],[true,false,true]]
==============Java String >>> JSON ==================
["json" ,"is" ,"easy" ]
{"json" :"is easy" }
["json" ,"is" ,"easy" ]
==============Java JSONObject >>> JSON ==================
{"string" :"JSON" ,"integer" :"1" ,"double" :"2.0" ,"boolean" :"true" }
==============Java JSONArray >>> JSON ==================
["JSON" ,"1" ,"2.0" ,"true" ]
==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================
JSON
==============Java JSONFunction >>> JSON ==================
param
doSomethingWithParam(param);
这里还有一个JSONFunction的对象,可以转换JavaScript的function。可以获取方法参数和方法体。同时,还可以用JSONObject、JSONArray构建Java对象,完成Java对象到JSON字符串的转换。
三、 JSON 对象反序列化成 Java 对象
1、 将json字符串转成Java对象
private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}" ;
/**
* <b>function:</b>将json字符串转化为java对象
* @author hoojo
* @createDate Nov 28, 2010 3:01:16 PM
*/
@Test
public void readJSON2Bean() {
fail("==============JSON Object String >>> Java Bean ==================" );
jsonObject = JSONObject.fromObject(json);
Student stu = (Student) JSONObject.toBean(jsonObject, Student.class );
fail(stu.toString());
}
运行后,结果如下:
==============JSON Object String >>> Java Bean ==================
tom#22#chian#2010-11-22#email@123.com
2、 将json字符串转换成动态Java对象(MorphDynaBean)
private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}" ;
@Test
public void readJSON2DynaBean() {
try {
fail("==============JSON Object String >>> Java MorphDynaBean ==================" );
JSON jo = JSONSerializer.toJSON(json);
Object o = JSONSerializer.toJava(jo);//MorphDynaBean
fail(PropertyUtils.getProperty(o, "address" ).toString());
jsonObject = JSONObject.fromObject(json);
fail(jsonObject.getString("email" ));
o = JSONSerializer.toJava(jsonObject);//MorphDynaBean
fail(PropertyUtils.getProperty(o, "name" ).toString());
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}
转换后的对象Object是一个MorphDynaBean的动态JavaBean,通过PropertyUtils可以获得指定的属性的值。
运行后结果如下:
==============JSON Object String >>> Java MorphDynaBean =============
chian
email@123.com
tom
3、 将json字符串转成Java的Array数组
private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}" ;
@Test
public void readJSON2Array() {
try {
fail("==============JSON Arry String >>> Java Array ==================" );
json = "[" + json + "]" ;
jsonArray = JSONArray.fromObject(json);
fail("#%%%" + jsonArray.get(0).toString());
Object[] os = jsonArray.toArray();
System.out.println(os.length);
fail(JSONArray.fromObject(json).join("" ));
fail(os[0].toString());
Student[] stus = (Student[]) JSONArray.toArray(jsonArray, Student.class );
System.out.println(stus.length);
System.out.println(stus[0]);
} catch (Exception e) {
e.printStackTrace();
}
}
运行的结果如下:
==============JSON Arry String >>> Java Array ==================
#%%%{"address" :"chian" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email@123.com" ,"id" :22,"name" :"tom" }
1
{"address" :"chian" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email@123.com" ,"id" :22,"name" :"tom" }
{"address" :"chian" ,"birthday" :{"birthday" :"2010-11-22" },"email" :"email@123.com" ,"id" :22,"name" :"tom" }
1
tom#22#chian#2010-11-22#email@123.com
4、 将JSON字符串转成Java的List集合
private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}" ;
@Test
public void readJSON2List() {
try {
fail("==============JSON Arry String >>> Java List ==================" );
json = "[" + json + "]" ;
jsonArray = JSONArray.fromObject(json);
List<Student> list = JSONArray.toList(jsonArray, Student.class );
System.out.println(list.size());
System.out.println(list.get(0));
list = JSONArray.toList(jsonArray);
System.out.println(list.size());
System.out.println(list.get(0));//MorphDynaBean
} catch (Exception e) {
e.printStackTrace();
}
}
运行后结果如下:
==============JSON Arry String >>> Java List ==================
1
tom#22#chian#2010-11-22#email@123.com
1
net.sf.ezmorph.bean.MorphDynaBean@141b571[
{id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[
{birthday=2010-11-22}
], address=chian, email=email@123.com, name=tom}
]
5、 将json字符串转换成Collection接口
private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}" ;
@Test
public void readJSON2Collection() {
try {
fail("==============JSON Arry String >>> Java Collection ==================" );
json = "[" + json + "]" ;
jsonArray = JSONArray.fromObject(json);
Collection<Student> con = JSONArray.toCollection(jsonArray, Student.class );
System.out.println(con.size());
Object[] stt = con.toArray();
System.out.println(stt.length);
fail(stt[0].toString());
} catch (Exception e) {
e.printStackTrace();
}
}
刚才上面的将json转换成list提示该方法过时,这里有toCollection,可以用此方法代替toList方法;运行后结果如下:
==============JSON Arry String >>> Java Collection ==================
1
1
tom#22#chian#2010-11-22#email@123.com
6、 将json字符串转换成Map集合
@Test
public void readJSON2Map() {
try {
fail("==============JSON Arry String >>> Java Map ==================" );
json = "{\"arr\":[\"a\",\"b\"],\"A\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"int\":1," +
"\"B\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
"\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"name\":\"json\",\"bool\":true}" ;
jsonObject = JSONObject.fromObject(json);
Map<String, Class<?>> clazzMap = new HashMap<String, Class<?>>();
clazzMap.put("arr" , String[].class );
clazzMap.put("A" , Student.class );
clazzMap.put("B" , Student.class );
Map<String, ?> mapBean = (Map) JSONObject.toBean(jsonObject, Map.class , clazzMap);
System.out.println(mapBean);
Set<String> set = mapBean.keySet();
Iterator<String> iter = set.iterator();
while (iter.hasNext()) {
String key = iter.next();
fail(key + ":" + mapBean.get(key).toString());
}
} catch (Exception e) {
e.printStackTrace();
}
}
运行后结果如下:
==============JSON Arry String >>> Java Map ==================
{A=jack#1#address#2010-11-22#email, arr=[a, b], B=jack#1#address#2010-11-22#email, int =1, name=json, bool=true}
A:jack#1#address#2010-11-22#email
arr:[a, b]
B:jack#1#address#2010-11-22#email
int :1
name:json
bool:true
四、 JSON-lib 对 XML 的支持
1、 将Java对象到XML
/*============================Java Object >>>>> XML ==========================*/
/**
* <b>function:</b> 转换Java对象到XML
* 需要额外的jar包:xom.jar
* @author hoojo
* @createDate Nov 28, 2010 2:39:55 PM
*/
@Test
public void writeObject2XML() {
XMLSerializer xmlSerializer = new XMLSerializer();
fail("==============Java String Array >>> XML ==================" );
//xmlSerializer.setElementName("bean");
fail(xmlSerializer.write(JSONArray.fromObject(bean)));
String[] sa = {"a" , "b" , "c" };
fail("==============Java String Array >>> XML ==================" );
fail(xmlSerializer.write(JSONArray.fromObject(sa)));
fail("==============Java boolean Array >>> XML ==================" );
boolean [] bo = { true, false, true };
fail(xmlSerializer.write(JSONArray.fromObject(bo)));
fail(xmlSerializer.write(JSONSerializer.toJSON(bo)));
Object[] o = { 1, "a" , true, 'A' , sa, bo };
fail("==============Java Object Array >>> JSON Array ==================" );
fail(xmlSerializer.write(JSONArray.fromObject(o)));
fail(xmlSerializer.write(JSONSerializer.toJSON(o)));
fail("==============Java String >>> JSON ==================" );
fail(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']" )).toString());
fail(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}" )).toString());
fail(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']" )).toString());
}
主要运用的是XMLSerializer的write方法,这个方法可以完成java对象到xml的转换,不过你很容易就可以看到这个xml序列化对象,需要先将java对象转成json对象,然后再将json转换吃xml文档。
运行后结果如下:
==============Java String Array >>> XML ==================
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e class ="object" >
< address type ="string" > address</ address >< birthday class ="object" >< birthday type ="string" > 2010-11-22</ birthday ></ birthday >
< email type ="string" > email</ email >< id type ="number" > 1</ id >< name type ="string" > haha</ name >
</ e ></ a >
==============Java String Array >>> XML ==================
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="string" > a</ e >< e type ="string" > b</ e >< e type ="string" > c</ e ></ a >
==============Java boolean Array >>> XML ==================
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="boolean" > true</ e >< e type ="boolean" > false</ e >< e type ="boolean" > true</ e ></ a >
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="boolean" > true</ e >< e type ="boolean" > false</ e >< e type ="boolean" > true</ e ></ a >
==============Java Object Array >>> JSON Array ==================
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="number" > 1</ e >< e type ="string" > a</ e >< e type ="boolean" > true</ e >< e type ="string" > A</ e >< e class ="array" >
< e type ="string" > a</ e >< e type ="string" > b</ e >< e type ="string" > c</ e ></ e >< e class ="array" >< e type ="boolean" > true</ e >
< e type ="boolean" > false</ e >< e type ="boolean" > true</ e ></ e ></ a >
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="number" > 1</ e >< e type ="string" > a</ e >< e type ="boolean" > true</ e >< e type ="string" > A</ e >< e class ="array" >
< e type ="string" > a</ e >< e type ="string" > b</ e >< e type ="string" > c</ e ></ e >< e class ="array" >< e type ="boolean" > true</ e >
< e type ="boolean" > false</ e >< e type ="boolean" > true</ e ></ e ></ a >
==============Java String >>> JSON ==================
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="string" > json</ e >< e type ="string" > is</ e >< e type ="string" > easy</ e ></ a >
<? xml version ="1.0" encoding ="UTF-8" ?>
< o >< json type ="string" > is easy</ json ></ o >
<? xml version ="1.0" encoding ="UTF-8" ?>
< a >< e type ="string" > json</ e >< e type ="string" > is</ e >< e type ="string" > easy</ e ></ a >
上面的节点名称有点乱,你可以通过setElementName设置节点名称
2、 将XML转换成Java对象
/*============================XML String >>>>> Java Object ==========================*/
/**
* <b>function:</b>转换xml文档到java对象
* @author hoojo
* @createDate Nov 28, 2010 3:00:27 PM
*/
@Test
public void readXML2Object() {
XMLSerializer xmlSerializer = new XMLSerializer();
fail("============== XML >>>> Java String Array ==================" );
String[] sa = {"a" , "b" , "c" };
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(sa)));
fail(jsonArray.toString());
String[] s = (String[]) JSONArray.toArray(jsonArray, String.class );
fail(s[0].toString());
fail("============== XML >>>> Java boolean Array ==================" );
boolean [] bo = { true, false, true };
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(bo)));
bo = (boolean []) JSONArray.toArray(jsonArray, boolean .class );
fail(bo.toString());
System.out.println(bo[0]);
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(bo)));
bo = (boolean []) JSONArray.toArray(jsonArray, boolean .class );
fail(bo.toString());
System.out.println(bo[0]);
fail("==============Java Object Array >>> JSON Array ==================" );
Object[] o = { 1, "a" , true, 'A' , sa, bo };
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(o)));
System.out.println(jsonArray.getInt(0));
System.out.println(jsonArray.get(1));
System.out.println(jsonArray.getBoolean(2));
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(o)));
System.out.println(jsonArray.get(4));
System.out.println(jsonArray.getJSONArray(5).get(0));
System.out.println(jsonArray.get(5));
fail("==============Java String >>> JSON ==================" );
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']" )).toString());
s = (String[]) JSONArray.toArray(jsonArray, String.class );
fail(s[0].toString());
jsonObject = (JSONObject) xmlSerializer.read(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}" )).toString());
Object obj = JSONObject.toBean(jsonObject);
System.out.println(obj);
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']" )).toString());
s = (String[]) JSONArray.toArray(jsonArray, String.class );
fail(s[1].toString());
}
主要运用到XMLSerializer的read方法,将xml内容读取后,转换成Java对象。运行后结果如下:
============== XML >>>> Java String Array ==================
["a" ,"b" ,"c" ]
a
============== XML >>>> Java boolean Array ==================
[Z@15856a5
true
[Z@79ed7f
true
==============Java Object Array >>> JSON Array ==================
1
a
true
["a" ,"b" ,"c" ]
true
["true" ,"false" ,"true" ]
==============Java String >>> JSON ==================
json
net.sf.ezmorph.bean.MorphDynaBean@c09554[
{json=is easy}
]
is
3、 将xml的字符串内容,转换成Java的Array对象
@Test
public void testReadXml2Array() {
String str = "<a class=\"array\">" +
"<e type=\"function\" params=\"i,j\">" +
"return matrix[i][j];" +
"</e>" +
"</a>" ;
JSONArray json = (JSONArray) new XMLSerializer().read(str);
fail(json.toString());
}
上面是一段xml字符串格式的文档,将其转换为JSONArray对象。转换后结果如下:
[function(i,j){ return matrix[i][j]; }]
版权所有,转载请注明出处
本文出自:
http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html
发表评论
-
[转] java中四种操作(dom、sax、jdom、dom4j)xml方式详解与比较
2019-01-17 10:35 3841. 介绍 1)DOM(JAXP Crimson解析器) ... -
利用反射与dom4j读取javabean生成对应XML和读取XML得到对应的javabean对象集合
2012-03-31 11:13 1017在上面这篇文档中,作者使用了Java jdk中的反射 ... -
Jackson 框架,轻易转换JSON
2012-03-16 12:40 1280Jackson可以轻松的将Java对象转换成json对象和xm ... -
用Castor 处理XML文档
2012-03-15 17:53 847——Castor可以完成Java和XML的相互转换 前面 ... -
xStream完美转换XML、JSON
2012-03-15 10:44 1005xStream框架 xStream可以轻易的将Java对象和 ... -
dom4j 解析xml 和包装xml
2012-03-10 09:01 751将xml解析: import java.io.File; ... -
dom4j 解析xml文档
2012-03-09 17:59 942<?xml version="1.0" ...
相关推荐
### JSON-lib框架详解:转换JSON、XML不再困难 #### 一、概述 JSON-lib是一个用于Java平台的强大且灵活的库,它可以实现Java对象与JSON、XML格式数据之间的互相转换。对于那些希望在Java应用程序中轻松处理JSON或...
在《JSON-lib框架,转换JSON、XML不再困难》的学习笔记中,可能涉及以下几个关键知识点: 1. JSON基础:JSON是一种轻量级的数据交换格式,易于人阅读和编写,同时也易于机器解析和生成。它基于JavaScript的一个子集...
2. **XML与JSON互转**:除了Java对象和JSON的转换,JSON-lib还支持XML和JSON之间的转换。这对于那些既有XML数据又有JSON需求的项目非常实用。 3. **多版本支持**:JSON-lib针对不同版本的Java(J2SE和J2ME)提供了...
4. **XML和JSON之间的转换**:json-lib还支持XML和JSON之间的互转,这对于处理既有XML又有JSON数据的系统非常有用。 5. **自定义转换规则**:用户可以通过实现`JsonConfig`类中的方法,自定义Java对象到JSON的转换...
2. **XML与JSON互转**:json-lib还支持XML与JSON之间的转换,这在处理不同数据格式时非常有用。 3. **自定义序列化**:通过实现JSONAware接口或使用JSONSerializer的transform方法,开发者可以定制JSON序列化过程,...
5. **XML与JSON互转**:JSON-lib还提供了XML和JSON之间的转换功能,这对于那些需要在XML和JSON间切换的应用非常有用。 综上所述,JSON-lib作为一个强大的Java JSON处理库,极大地简化了JSON在Java开发中的使用。...
2. **XML与JSON互转**:除了基本的Java对象与JSON之间的转换,`json-lib`还提供了XML到JSON以及JSON到XML的转换功能,使得两种数据交换格式可以无缝对接。 3. **支持多种数据类型**:`json-lib`不仅支持基本的数据...
在文件列表中的"jsonlib需要jar包",这可能是指包含了`json-lib`库及其所有依赖的JAR文件。在实际项目中,将这些JAR文件添加到项目的类路径(classpath)中,就可以使用`json-lib`提供的功能,而无需通过Maven或其他...
1、json的核心包:json-lib-2.4-jdk15.jar; 2、json-lib-2.4-jdk15.jar依赖的jar包:commons-beanutils-1.9.3.jar,commons-collections-3.2.2.jar,commons-lang-2.6.jar,commons-logging-1.2.jar,ezmorph-1.0.6...
4. **XML与JSON互转**:除了基本的JSON操作,`json-lib`还提供了XML与JSON之间的转换功能,这对于需要在XML和JSON之间进行数据交换的应用非常有用。 5. **依赖包的集成**:`json-lib-2.3-jdk15`开发包包含了所有...
4. **XML到JSON**: `json-lib`还支持XML数据到JSON的转换,这对于在不同的数据格式之间进行转换非常有用。 `json-lib`的使用方法通常包括以下步骤: 1. **引入依赖**: 首先,你需要在项目中引入`json-lib-2.4-jdk...
3. **XML和JSON之间的转换**:json-lib还支持XML与JSON之间的互换,这对于处理既有XML又有JSON的混合环境非常有用。 4. **支持多种Java类型**:json-lib支持包括基本类型、集合、数组、日期、自定义对象等多种Java...
3. **XML与JSON互转**:JSON Lib还提供了XML和JSON之间的转换功能,使得两种数据交换格式可以灵活切换。 4. **处理复杂结构**:支持处理嵌套的JSON对象和数组,可以轻松地处理复杂的JSON数据结构。 ### 示例代码 ``...
`json-lib` 是一个 Java 库,它提供了将 JSON 格式的数据转换为 Java 对象,以及将 Java 对象转换为 JSON 格式数据的功能。在 Java 开发中,`json-lib` 是一个常用的 JSON 处理工具,尤其适用于需要处理复杂 JSON ...
总的来说,JSON-lib.jar作为Java平台上的JSON处理工具,提供了全面而强大的JSON操作功能,包括基本类型的转换、复杂数据结构的处理、XML与JSON之间的转换等。无论你是新手还是经验丰富的开发者,这个库都是处理JSON...
4. **XML与JSON的转换**:JSON-Lib还提供了XML和JSON之间的转换功能。`JSONObject jsonObject = XML.toJSONObject(xmlString);`可以将XML字符串转换为JSON对象,反之亦然。 5. **自定义类型转换**:对于自定义的...
json-lib是一个Java库,它提供了多种Java集合(如List、Map等)与JSON之间的转换功能。版本2.4是该库的一个稳定版本,支持jdk15及以上的Java运行环境。通过引入`json-lib-2.4-jdk15.jar`,开发者可以在项目中轻松地...