使用Java构造和解析Json数据的两种方法(详解一)

List list = new ArrayList();
list.add( "first" );
list.add( "second" );
JSONArray jsonArray2 = JSONArray.fromObject( list ); 

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); 

JSONObject jsonObject = JSONObject.fromObject(new JsonBean()); 

boolean[] boolArray = new boolean[] { true, false, true };
JSONArray jsonArray1 = JSONArray.fromObject(boolArray); 

JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']" );

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); 

package com.json;
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;
/**
* 使用json-lib构造和解析Json数据
* 
* @author Alexia
* @date 2013/5/23
*
*/
public class JsonTest {
/**
* 构造Json数据
* 
* @return
*/
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
* 
* @param jsonString Json数据字符串
*/
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) {
// TODO Auto-generated method stub
ParseJson(BuildJson());
}
}