1.json的基本語法

1.表示一個(gè)對象

{"name":'"zhangsan","age":22}

{"name":"lisi","addr":{"city":"jinan","street":"huayuanlu"}}

屬性名要添加引號(hào)

屬性值如果是字符串，要添加引號(hào)

數(shù)據(jù)類型:string,number,boolean,null,object

2.表示一個(gè)對象數(shù)組

[{},{},{}]

2.Java處理json

1.首先引入json的jar包

2.

// 對象轉(zhuǎn)換為json字符串??Student st = new Student();

st.setId(1);

st.setAge(22);

st.setName("張三s");

st.setAddr("jinan");

JSONObject obj = JSONObject.fromObject(st);

String str = obj.toString();??System.out.println(str);// {"addr":"jinan","age":22,"id":1,"name":"張三s"}

// 數(shù)組對象轉(zhuǎn)換位json字符串??Student s1 = new Student(2, 22, "李四", "濟(jì)寧");

Student s2 = new Student(3, 23, "王五", "青島");

Student s3 = new Student(4, 24, "趙六", "上海");

Student[] ssarr = { s1, s2, s3 };

JSONArray obj1 = JSONArray.fromObject(ssarr);

String str1 = obj1.toString();??System.out.println(str1);

// list對象轉(zhuǎn)換為json字符串??Student s11 = new Student(2, 22, "李四1", "濟(jì)寧1");

Student s22 = new Student(3, 23, "王五1", "青島1");

Student s33 = new Student(4, 24, "趙六1", "上海1");

Listsslist = new ArrayList();

sslist.add(s11);

sslist.add(s22);

sslist.add(s33);

JSONArray obj2 = JSONArray.fromObject(sslist);

String str2 = obj2.toString();??System.out.println(str2);

3.json處理日期

原始的處理方法得到的是日期對象的json字符串

{"date":15,"day":5,"hours":11,"minutes":31,"month":10,"seconds":9,"time":1384486269320,"timezoneOffset":-480,"year":113}

1.首先寫一個(gè)日期處理器工具類 implements JsonValueProcessor

public class DateProcessor implements JsonValueProcessor {

String pattern ="yyyy-MM-dd";

@Override

public Object processArrayValue(Object arg0, JsonConfig arg1) {

SimpleDateFormat sdf = new SimpleDateFormat(pattern);

return sdf.format((Date) arg0);

}

@Override

public Object processObjectValue(String arg0, Object arg1, JsonConfig arg2) {

SimpleDateFormat sdf = new SimpleDateFormat(pattern);

return sdf.format((Date) arg1);

}

}

2.在對象轉(zhuǎn)json的時(shí)候加上config參數(shù)

// json處理日期

JsonConfig config = new JsonConfig();

config.registerJsonValueProcessor(Date.class, new DateProcessor());

Student dd = new Student(2, 22, "李四1", "濟(jì)寧1", new Date());

JSONObject obj3 = JSONObject.fromObject(dd,config);

String str3 = obj3.toString();

System.out.println(str3);

這樣之后日期就是一個(gè)字符串了

"2013-11-15"

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