首先说明一下，json-lib相较于Jackson以及GSON，性能是最低的，并且长期没有更新，所以不推荐使用。
1.Maven Dependency
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.fool.json</groupId> <artifactId>json</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>JSON</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.1</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> </dependencies> </project>
先来看一个简单的DEMO
JsonlibDemo.java
package org.fool.json.jsonlib;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class JsonlibDemo
{
public static void main(String[] args)
{
String jsonContent = "{'hello':'world', 'hero':'heroine'}";
JSONObject jsonObject = JSONObject.fromObject(jsonContent);
String str1 = jsonObject.getString("hello");
String str2 = jsonObject.getString("hero");
System.out.println(str1);
System.out.println(str2);
System.out.println("--------------------");
jsonContent = "[{'hello': 333, 'abc': false, 'xyz': {'a': 1, 'b': 'ab'}}, "
+ "{'hello': 555, 'abc': true, 'xyz': {'a': 3, 'b': 'ba'}}]";
JSONArray jsonArray = JSONArray.fromObject(jsonContent);
for (Object object : jsonArray)
{
JSONObject jsonObject2 = JSONObject.fromObject(object);
int value1 = jsonObject2.getInt("hello");
boolean value2 = jsonObject2.getBoolean("abc");
// String value33 = jsonObject2.getString("xyz");
JSONObject jsonObject3 = jsonObject2.getJSONObject("xyz");
int value3 = jsonObject3.getInt("a");
String value4 = jsonObject3.getString("b");
System.out.println(value1);
System.out.println(value2);
System.out.println(value3);
System.out.println(value4);
}
}
}
2.POJO
Person.java
package org.fool.json.jsonlib;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
public class Person
{
private String username;
private String password;
private int age;
private String address;
private List<String> list = new ArrayList<>();
public String getUsername()
{
return username;
}
public void setUsername(String username)
{
this.username = username;
}
public String getPassword()
{
return password;
}
public void setPassword(String password)
{
this.password = password;
}
public int getAge()
{
return age;
}
public void setAge(int age)
{
this.age = age;
}
public String getAddress()
{
return address;
}
public void setAddress(String address)
{
this.address = address;
}
public List<String> getList()
{
return list;
}
public void setList(List<String> list)
{
this.list = list;
}
@Override
public String toString()
{
return ToStringBuilder.reflectionToString(this,
ToStringStyle.SHORT_PREFIX_STYLE);
}
}
3.JUnit Test
JsonlibTest.java
package org.fool.json.jsonlib;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.junit.Before;
import org.junit.Test;
public class JsonlibTest
{
private JSONObject jsonObject = null;
private JSONArray jsonArray = null;
private Person person = null;
@Before
public void setUp() throws Exception
{
person = new Person();
person.setUsername("zhangsan");
person.setPassword("123456");
person.setAddress("beijing");
person.setAge(30);
person.getList().add("hello");
person.getList().add("world");
person.getList().add("Hero");
person.getList().add("Heroine");
}
......
}
testEntity2Json
...
@Test
public void testEntity2Json()
{
jsonObject = JSONObject.fromObject(person);
System.out.println(jsonObject);
}
...
result
{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"}
testArray2Json
...
@Test
public void testArray2Json()
{
Person[] persons = {person, person};
// int[] i = { 8, 8, 5, 6, 7 };
jsonArray = JSONArray.fromObject(persons);
System.out.println(jsonArray);
}
...
result
[{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"},{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"}]
testList2Json
...
@Test
public void testList2Json()
{
List<Person> list = new ArrayList<>();
list.add(person);
list.add(person);
jsonArray = JSONArray.fromObject(list);
System.out.println(jsonArray);
}
...
result
[{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"},{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"}]
testMap2Json
...
@Test
public void testMap2Json()
{
Map<String, Person> map = new HashMap<>();
map.put("001", person);
map.put("002", person);
jsonObject = JSONObject.fromObject(map);
System.out.println(jsonObject);
}
...
result
{"001":{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"},"002":{"address":"beijing","age":30,"list":["hello","world","Hero","Heroine"],"password":"123456","username":"zhangsan"}}