Json字符串示例:
{
"age": 20,
"gender": "male",
"grades": "三班",
"name": "苏三",
"weight": 63.5
}
遇到这样的格式的Json字符串,我们可以将其解析成一个bean,同时我们也可以直接将其解析为Map。
解析成Map比较简单,我们直接来看看解析方法。
第一种方法:
package com.test;
import java.util.HashMap;
import java.util.Map;
import net.sf.json.JSONObject;
public class Domain {
@SuppressWarnings("unchecked")
public static void main(String[] args) {
String jsonStr = "{\"weight\":51.3,\"name\":\"露西\",\"age\":26,\"gender\":\"female\",\"grades\":\"三班\"}";
Map<String, Object> map = new HashMap<String, Object>();
map = JSONObject.fromObject(jsonStr);
System.out.println(map.get("weight"));
System.out.println(map.get("name"));
System.out.println(map.get("age"));
System.out.println(map.get("gender"));
System.out.println(map.get("grades"));
}
}
说明:
第二种方法:
package com.test;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import net.sf.json.JSONObject;
public class Domain {
@SuppressWarnings("unchecked")
public static void main(String[] args) {
String jsonStr = "{\"weight\":51.3,\"name\":\"露西\",\"age\":26,\"gender\":\"female\",\"grades\":\"三班\"}";
Map<String, Object> map = new HashMap<String, Object>();
JSONObject jsonObject = JSONObject.fromObject(jsonStr);
Iterator<String> keys = jsonObject.keys();//定义迭代器
String key = null;
Object value = null;
while(keys.hasNext()){
key = keys.next();
value = jsonObject.get(key);
map.put(key, value);
}
System.out.println(map.get("weight"));
System.out.println(map.get("name"));
System.out.println(map.get("age"));
System.out.println(map.get("gender"));
System.out.println(map.get("grades"));
}
}
说明:
最后,我们来看看怎么通过Map生成Json字符串
package com.test;
import java.util.HashMap;
import java.util.Map;
import net.sf.json.JSONObject;
public class Domain {
public static void main(String[] args) {
Map<String, Object> map = new HashMap<String, Object>();
map.put("age", 26);
map.put("gender", "female");
map.put("grades", "三班");
map.put("name", "露西");
map.put("weight", 51.3f);
String jsonStr = JSONObject.fromObject(map).toString();
System.out.println(jsonStr);
}
}