json-lib和org.json的使用几乎是相同的,我总结出的区别有两点:
两种包
1. List集合转换成json方法
List list = new ArrayList(); list.add( "first" ); list.add( "second" ); JSONArray jsonArray2 = JSONArray.fromObject( list ); 2:map 转换为json
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代码
JSONObject jsonObject = JSONObject.fromObject(new JsonBean()); 4:数组转换成json代码
boolean[] boolArray = new boolean[] { true, false, true }; JSONArray jsonArray1 = JSONArray.fromObject(boolArray);5:一般数据转换json
JSONArray jsonArray3 = JSONArray.fromObject("[‘json‘,‘is‘,‘easy‘]" );6:beans转换成json代码
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: 解析json 数据
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()); } }
时间: 2024-10-29 12:43:35