解析Json文件

 ???/** ????* 把json文件读取到内存中 ????* ?????* @throws IOException ????*/ ???public String getFile(String filePath) throws IOException { ???????StringBuffer jsonFile = new StringBuffer(); ???????Reader iStream = new FileReader(filePath); ???????BufferedReader br = new BufferedReader(iStream); ???????String line = ""; ???????while ((line = br.readLine()) != null) { ???????????jsonFile.append(line); ???????} ???????return jsonFile.toString(); ???}

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()); ???}}