本文共 3018 字，大约阅读时间需要 10 分钟。

在Ajax的应用中，我们通常需要将JavaBean，List，Map等对象转为Json串，方便页面解析

需要导入的jar包有

commons-beanutils-1.7.0.jar

commons.collections-3.2.jar commons-lang-2.4.jar commons-logging-1.1.jar ezmorph-1.0.4.jar jdom.jar json-lib-2.2.2-jdk15.jar json-lib-2.2.3-jdk13.jar

POJO类

Student类

public class Student {	private String id;	private String name;	public String getId() {		return id;	}	public void setId(String id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}}

Person类：

public class Person {	private String name;	private int age;	private Student student;	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public int getAge() {		return age;	}	public void setAge(int age) {		this.age = age;	}	public Student getStudent() {		return student;	}	public void setStudent(Student student) {		this.student = student;	}	}

1、将JavaBean转为Json串

public  void test1(){	Student stu = new Student();	stu.setId("111");	stu.setName("stu1");	Person p = new Person();	p.setAge(18);	p.setName("Person1");	p.setStudent(stu);	JSONObject json = JSONObject.fromObject(p);//将对象转json	System.out.println(json.toString());						Person jb = (Person)JSONObject.toBean(json,Person.class);	//将json转为JavaBean	System.out.println(jb.getAge());	System.out.println(jb.getName());}

输出结果为：{"age":18,"name":"Person1","student":{"id":"111","name":"stu1"}}

2、将List转为Json

public void test2(){	List list1 = new ArrayList();	list1.add( "first" );	list1.add( "second" );	JSONArray arrayToJson = JSONArray.fromObject( list1 );	System.out.println(arrayToJson.toString());	System.out.println("--------------");	List list2 = new ArrayList();	Student s1 = new Student();	s1.setId("111");s1.setName("aaa");	Student s2 = new Student();	s2.setId("111");s2.setName("aaa");	list2.add(s1);	list2.add(s2);	arrayToJson = JSONArray.fromObject(list2);	System.out.println(arrayToJson.toString());}

输出结果：

["first","second"]

-------------- [{"id":"111","name":"aaa"},{"id":"111","name":"aaa"}]

3、将Set转为Json

public void test5(){	Set set = new HashSet();	set.add("aaa");	set.add("bbb");	set.add("ccc");	JSONArray jsonArray = JSONArray.fromObject(set);	System.out.println(jsonArray.toString());	System.out.println("--------------");	Student stu = new Student();	stu.setId("111");stu.setName("aaa");	jsonArray = JSONArray.fromObject(stu);	System.out.println(jsonArray.toString());}

输出结果：

["aaa","ccc","bbb"]

-------------- [{"id":"111","name":"aaa"}]

由此可见，List转化为Json与Set转换为Json的代码基本相同

4、Map对象转化为Json

public void test3(){	Map map = new HashMap();	map.put("key1","aaa");	map.put("key2","bbb");	map.put("key3","ccc");	map.put("key4","ddd");	JSONObject obj = JSONObject.fromObject(map);	System.out.println(obj.toString());}

输出结果：{"key4":"ddd","key3":"ccc","key2":"bbb","key1":"aaa"}

5、数组类型转化为json串

public void test4(){			boolean[] boolArray = new boolean[] { true, false, true };	JSONArray jsonArray1 = JSONArray.fromObject(boolArray);	System.out.println(jsonArray1.toString());}

输出结果：[true,false,true]

转载地址：http://ljcrj.baihongyu.com/