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。
原文地址：
JSON-lib框架，转换JSON、XML不再困难
以下是笔记：
1 ，改造成Maven项目，这里是pom.xml文件：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 ">
<modelVersion>4.0.0</modelVersion>
<groupId>com.coderdream</groupId>
<artifactId>json-lib-demo</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>json-lib-demo Maven Webapp</name>
<url></url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>xom</groupId>
<artifactId>xom</artifactId>
<version>1.2.5</version>
</dependency>
</dependencies>
<build>
<finalName>json-lib-demo</finalName>
</build>
</project>
2，完整的JsonlibTest.java文件：
package com.hoo.test;
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.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.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
* @email hoojo_@126.com
* @version 1.0
*/
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);
}
/* =========================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());
}
/**
* <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());
}
/**
* <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());
}
/**
* <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<String> input = new ArrayList<String>();
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());
}
private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"
+ "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
@SuppressWarnings("unchecked")
@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();
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
@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();
}
}
/* ============================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());
}
/* ============================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());
}
@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());
}
}
3，运行结果：
==============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}
==============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
==============Java String Array >>> XML ==================
<xml version="1.0" encoding="UTF-8">
<a><e><address type="string">address</address><birthday><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><e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e><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><e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e><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>
==============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"}
八月 08, 2015 5:22:46 下午 net.sf.json.JSONObject morphPropertyValue
警告: Can't transform property 'birthday' from java.lang.String into com.hoo.entity.Birthday. Will register a default Morpher
八月 08, 2015 5:22:46 下午 net.sf.ezmorph.bean.BeanMorpher morph
警告: Property 'java.lang.String.birthday' does not exist. SKIPPED.
八月 08, 2015 5:22:46 下午 net.sf.ezmorph.bean.BeanMorpher morph
信息: Property 'com.hoo.entity.Birthday.class' has no write method. SKIPPED.
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
八月 08, 2015 5:22:46 下午 net.sf.ezmorph.bean.BeanMorpher morph
警告: Property 'java.lang.String.birthday' does not exist. SKIPPED.
八月 08, 2015 5:22:46 下午 net.sf.ezmorph.bean.BeanMorpher morph
信息: Property 'com.hoo.entity.Birthday.class' has no write method. SKIPPED.
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
==============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);
==============JSON Arry String >>> Java Collection ==================
1
1
tom#22#chian#2010-11-22#email@123.com
============== XML >>>> Java String Array ==================
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
["a","b","c"]
a
============== XML >>>> Java boolean Array ==================
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
[Z@59930b4b
true
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
[Z@44ca96de
true
==============Java Object Array >>> JSON Array ==================
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
1
a
true
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
["a","b","c"]
true
["true","false","true"]
==============Java String >>> JSON ==================
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
json
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
net.sf.ezmorph.bean.MorphDynaBean@4436f0c9[
{json=is easy}
]
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
is
八月 08, 2015 5:22:47 下午 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
[function(i,j){ return matrix[i][j]; }]
==============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"}]
4，源代码git地址：
5，源代码下载：
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