标签:json
本文转自:http://blog.csdn.net/yangbobo1992/article/details/8350765
1.从Object到String
要先用Object对象构造一个JSONObject或者JSONArray对象,然后调用它的toString()方法即可
(1)示例一
1 Book book=new Book();2 book.setName("Java");3 book.setPrice(52.3f);4 JSONObject object=JSONObject.fromObject(book);5 System.out.println(object.toString());
(2)示例二
1 Book book=new Book(); 2 book.setName("Java"); 3 book.setPrice(52.3f); 4 5 Book book2=new Book(); 6 book2.setName("C"); 7 book2.setPrice(42.3f); 8 List list=new ArrayList(); 9 list.add(book);10 list.add(book2);11 JSONArray arry=JSONArray.fromObject(list);12 System.out.println(arry.toString());13 //结果如下:14 [{"name":"Java","price":52.3},{"name":"C","price":42.3}]
2.从String到Object
要先用String对象构造一个JSONObject或者JSONArray对象
(1)示例一
1 String json="{name:‘Java‘,price:52.3}"; 2 JSONObject object=JSONObject.fromObject(json);3 System.out.println(object.get("name")+" "+object.get("price"));
(2)示例二
1 String json="[{name:‘Java‘,price:52.3},{name:‘C‘,price:42.3}]";2 JSONArray array=JSONArray.fromObject(json);3 for(int i=0;i<array.size();i++){4 Map o=(Map)array.get(i);5 System.out.println(o.get("name")+" "+o.get("price"));6 }
3.从String到Bean
(1)单个Bean对象
1 String json="{name:‘Java‘,price:52.3}";2 JSONObject object=JSONObject.fromObject(json);3 Product product=(Product)JSONObject.toBean(object,Product.class);4 System.out.println(product.getName()+" "+product.getPrice());
(2).Bean的数组
1 String json="[{name:‘Java‘,price:52.3},{name:‘C‘,price:42.3}]";2 JSONArray array=JSONArray.fromObject(json);3 Product[] products=(Product[]) JSONArray.toArray(array,Product.class);4 for(Product p:products){5 System.out.println(p.getName()+" "+p.getPrice());6 }
自定义封装JSON操作的类
1 package com.util; 2 3 import java.util.List; 4 import java.util.Map; 5 6 import net.sf.json.JSONArray; 7 import net.sf.json.JSONObject; 8 9 public class JsonHelper {10 //从普通的Bean转换为字符串11 public static String getJson(Object o){12 JSONObject jo=JSONObject.fromObject(o);13 return jo.toString();14 }15 //从Java的列表转换为字符串16 public static String getJson(List list){17 JSONArray ja=JSONArray.fromObject(list);18 return ja.toString();19 }20 //从Java对象数组转换为字符串21 public static String getJson(Object[] arry){22 JSONArray ja=JSONArray.fromObject(arry);23 return ja.toString();24 }25 //从json格式的字符串转换为Map对象26 public static Map getObject(String s){27 return JSONObject.fromObject(s);28 }29 //从json格式的字符串转换为List数组30 public static List getArray(String s){31 return JSONArray.fromObject(s);32 }33 //从json格式的字符串转换为某个Bean34 public static Object getObject(String s,Class cls){35 JSONObject jo=JSONObject.fromObject(s);36 return JSONObject.toBean(jo, cls);37 }38 //从json格式的字符串转换为某类对象的数组39 public static Object getArray(String s,Class cls){40 JSONArray ja=JSONArray.fromObject(s);41 return JSONArray.toArray(ja, cls);42 }43 }
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标签:json
原文地址:http://fengcl.blog.51cto.com/9961331/1708751