Java中JSON-lib包解析Json格式总结
JSON-lib包是一个beans,collections,maps,java arrays,XML和JSON互相转换的包，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。
下载
JSON-lib包下载地址：http://json-lib.sourceforge.net/
格式转换方法
1. List集合转换成json方法
List list = new ArrayList(); list.add( "one" ); list.add( "two" ); JSONArray jsonArray2 = JSONArray.fromObject( list );
2. Map集合转换成json方法
Map map = new HashMap();
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]; }");
JSONObject json = JSONObject.fromObject(map);
3. Bean转换成json方法
JSONObject jsonObject = JSONObject.fromObject(new JsonBean());
4. 数组转换成json方法
boolean[] boolArray = new boolean[] { true, false, true };
JSONArray jsonArray1 = JSONArray.fromObject(boolArray);
5. 字符串转换成json方法
JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']" );
6. beans转换成json方法
List list = new ArrayList();
JsonBean2 jb1 = new JsonBean2();
jb1.setCol(1);
jb1.setRow(1);
jb1.setValue("xx");
JsonBean2 jb2 = new JsonBean2();
jb2.setCol(2);
jb2.setRow(2);
jb2.setValue("");
list.add(jb1);
list.add(jb2);
JSONArray ja = JSONArray.fromObject(list);
7. JSONObject转换DynaBean方法
String json = "{name=\"json\",bool:true,int:1,double:2.2}";
JSONObject jsonObject = JSONObject.fromObject(json);
//抽象的写法：DynaBean bean = (DynaBean) JSONSerializer.toJava( jsonObject );
Object bean = JSONObject.toBean(jsonObject);
//Object bean1 = JSONSerializer.toJava(jsonObject);
assertEquals(jsonObject.get("name"), PropertyUtils.getProperty(bean, "name"));
assertEquals(jsonObject.get("bool"), PropertyUtils.getProperty(bean, "bool"));
assertEquals(jsonObject.get("int"), PropertyUtils.getProperty(bean, "int"));
assertEquals(jsonObject.get("double"), PropertyUtils.getProperty(bean, "double"));
8. JSONObject转换JavaBean方法
String json = "{name:\"zhangsan\",age:25,hight:1.72,sex:true}";
JSONObject jsonObject = JSONObject.fromObject(json);
UserBean bean = (UserBean) JSONObject.toBean(jsonObject, UserBean.class);
System.out.println(jsonObject);
9. JSONArray转换List方法
String json = "[\"first\",\"second\"]"; JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(json); List output = (List) JSONSerializer.toJava(jsonArray);
10. JSONArray转换array方法
String json = "[\"first\",\"second\"]";
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(json);
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setArrayMode(JsonConfig.MODE_OBJECT_ARRAY);
Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);
Object[] expected = new Object[] { "first", "second" };
ArrayAssertions.assertEquals(expected, output);
11. Arrays转换Json方法
@Test
public void array2json() {
int[] intArray = new int[] {
1,
4,
5
};
JSONArray jsonArray1 = JSONArray.fromObject(intArray);
System.out.println("int[] intArray");
System.out.println(jsonArray1);
boolean[] boolArray = new boolean[] {
true,
false,
true
};
System.out.println("boolean[] boolArray");
JSONArray jsonArray2 = JSONArray.fromObject(boolArray);
System.out.println(jsonArray2);
int[][] int2Array = new int[][] {
{
1,
2
},
{
3,
4
}
};
JSONArray jsonArray3 = JSONArray.fromObject(int2Array);
System.out.println("int[][] int2Array");
System.out.println(jsonArray3);
float[] floatArray = new float[] {
0.1f,
0.2f,
0.3f
};
JSONArray jsonArray4 = JSONArray.fromObject(floatArray);
System.out.println("float[] floatArray");
System.out.println(jsonArray4);
String[] strArray = new String[] {
"hello",
"hebut",
"xiapi"
};
JSONArray jsonArray5 = JSONArray.fromObject(strArray);
System.out.println("String[] strArray");
System.out.println(jsonArray5);
}
运行结果：
int[] intArray [1,4,5] boolean[] boolArray [true,false,true] int[][] int2Array [[1,2],[3,4]] float[] floatArray [0.1,0.2,0.3] String[] strArray ["hello","hebut","xiapi"]
12. Collections转换Json方法
@Test
public void collections2json() {
List list1 = new ArrayList();
list1.add("first");
list1.add("second");
JSONArray jsonArray1 = JSONArray.fromObject(list1);
System.out.println("List list1");
System.out.println(jsonArray1);
List < Student > list2 = new ArrayList < Student > ();
list2.add(new Student("xiapi1", "男", 10));
list2.add(new Student("xiapi2", "女", 11));
list2.add(new Student("xiapi3", "男", 12));
JSONArray jsonArray2 = JSONArray.fromObject(list2);
System.out.println("List<Student> list2");
System.out.println(jsonArray2);
}
运行结果：
List list1
["first","second"]
List<Student> list2
[{"age":10,"sex":"男","userName":"xiapi1"},{"age":11,"sex":"女","userName":"xiapi2"},{"age":12,"sex":"男","userName":"xiapi3"}]
13. Xml转换Json方法
@Test
public void xml2json() {
String s = "<student>
<name id='n1'>xiapi</name>
<sex class='s1'>男</sex>
<age>20</age>
</student>";
XMLSerializer x = new XMLSerializer();
JSON json = x.read(s);
System.out.println("XmlToJson");
System.out.println(json.toString());
}
运行结果：
2012-5-21 19:01:03 net.sf.json.xml.XMLSerializer getType
信息: Using default type string
XmlToJson
{"name":{"@id":"n1","#text":"xiapi"},"sex":{"@id":"s1","#text":"男"},"age":"20"}
解析例子
/**
* 使用json-lib构造和解析Json数据
*/
public class JsonTest {
public static String BuildJson() {
// JSON格式数据解析对象
JSONObject jo = new JSONObject();
// 下面构造两个map、一个list和一个Employee对象
Map<String, String> map1 = new HashMap<String, String>();
map1.put("name", "Alexia");
map1.put("sex", "female");
map1.put("age", "23");
Map<String, String> map2 = new HashMap<String, String>();
map2.put("name", "Edward");
map2.put("sex", "male");
map2.put("age", "24");
List<Map> list = new ArrayList<Map>();
list.add(map1);
list.add(map2);
Employee employee = new Employee();
employee.setName("wjl");
employee.setSex("female");
employee.setAge(24);
// 将Map转换为JSONArray数据
JSONArray ja1 = JSONArray.fromObject(map1);
// 将List转换为JSONArray数据
JSONArray ja2 = JSONArray.fromObject(list);
// 将Bean转换为JSONArray数据
JSONArray ja3 = JSONArray.fromObject(employee);
System.out.println("JSONArray对象数据格式：");
System.out.println(ja1.toString());
System.out.println(ja2.toString());
System.out.println(ja3.toString());
// 构造Json数据，包括一个map和一个Employee对象
jo.put("map", ja1);
jo.put("employee", ja2);
System.out.println("\n最终构造的JSON数据格式：");
System.out.println(jo.toString());
return jo.toString();
}
/**
* 解析Json数据
*/
public static void ParseJson(String jsonString) {
// 以employee为例解析，map类似
JSONObject jb = JSONObject.fromObject(jsonString);
JSONArray ja = jb.getJSONArray("employee");
List<Employee> empList = new ArrayList<Employee>();
// 循环添加Employee对象（可能有多个）
for (int i = 0; i < ja.size(); i++) {
Employee employee = new Employee();
employee.setName(ja.getJSONObject(i).getString("name"));
employee.setSex(ja.getJSONObject(i).getString("sex"));
employee.setAge(ja.getJSONObject(i).getInt("age"));
empList.add(employee);
}
System.out.println("\n将Json数据转换为Employee对象：");
for (int i = 0; i < empList.size(); i++) {
Employee emp = empList.get(i);
System.out.println("name: " + emp.getName() + " sex: "
+ emp.getSex() + " age: " + emp.getAge());
}
}
/**
* @param args
*/
public static void main(String[] args) {
ParseJson(BuildJson());
}
}
运行结果：
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