1.简单的解析json字符串
首先将json字符串转换为json对象，然后再解析json对象，过程如下。
JSONObject jsonObject = JSONObject.fromObject(jsonStr);
根据json中的键得到它的值
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String name = jsonObject.getString("name"); int num = jsonObject.getInt("num"); String sex = jsonObject.getString("sex"); int age = jsonObject.getInt("age"); |
2.将json字符串转换为java对象
同样先将json字符串转换为json对象，再将json对象转换为java对象，如下所示。
JSONObject obj = new JSONObject().fromObject(jsonStr);//将json字符串转换为json对象
将json对象转换为java对象
Person jb = (Person)JSONObject.toBean(obj,Person.class);//将建json对象转换为Person对象
3.将java对象转换为json字符串
先将java对象转换为json对象，在将json对象转换为json字符串
JSONObject json = JSONObject.fromObject(obj);//将java对象转换为json对象
String str = json.toString();//将json对象转换为字符串
完整代码如下：
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package baz.parse; import java.util.ArrayList; import java.util.List; import net.sf.json.JSON; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JSONSerializer; import baz.bean.Person; public class ParseJson { private String jsonStr; public ParseJson() { } public ParseJson(String str){ this.jsonStr = str; } /** * 解析json字符串 */ public void parse(){ JSONObject jsonObject = JSONObject.fromObject(jsonStr); String name = jsonObject.getString("name"); int num = jsonObject.getInt("num"); String sex = jsonObject.getString("sex"); int age = jsonObject.getInt("age"); System.out.println(name + " " + num + " " + sex + " " + age); } //将json字符串转换为java对象 public Person JSON2Object(){ //接收{}对象，此处接收数组对象会有异常 if(jsonStr.indexOf("[") != -1){ jsonStr = jsonStr.replace("[", ""); } if(jsonStr.indexOf("]") != -1){ jsonStr = jsonStr.replace("]", ""); } JSONObject obj = new JSONObject().fromObject(jsonStr);//将json字符串转换为json对象 Person jb = (Person)JSONObject.toBean(obj,Person.class);//将建json对象转换为Person对象 return jb;//返回一个Person对象 } } |
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package baz.bean; public class Person { private String name; private int num; private String sex; private int age; public Person() { // TODO Auto-generated constructor stub } public Person(String name, int num, String sex, int age) { super(); this.name = name; this.num = num; this.sex = sex; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getNum() { return num; } public void setNum(int num) { this.num = num; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } |
将java对象转换为json字符串
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package baz.cons; import net.sf.json.JSONObject; /** * 将java对象转换为json字符串 * @author Administrator * */ public class ConsJson { public ConsJson() { // TODO Auto-generated constructor stub } public String Object2Json(Object obj){ JSONObject json = JSONObject.fromObject(obj);//将java对象转换为json对象 String str = json.toString();//将json对象转换为字符串 return str; } } |
测试类：
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package baz.test; import java.util.List; import baz.bean.Person; import baz.cons.ConsJson; import baz.parse.ParseJson; public class Test { public static void main(String[] args) { //将字符串转换为json对象，然后根据建得到相应的值 ParseJson pj = new ParseJson("{\"name\":\"gu\",\"num\":123456,\"sex\":\"male\",\"age\":24}"); pj.parse(); //将一个json字符串转换为java对象 Person p = pj.JSON2Object(); System.out.println("Name:" + p.getName()); System.out.println("Num:" + p.getNum()); System.out.println("Sex:" + p.getSex()); System.out.println("age:" + p.getAge()); //将一个java对象转换为Json字符串 Person p1 = new Person("gu1",123,"male",23); ConsJson cj = new ConsJson(); String str1 = cj.Object2Json(p1); System.out.println(str1); } } |
测试输出如下：
gu 123456 male 24
Name:gu
Num:123456
Sex:male
age:24
{“age”:23,”name”:”gu1″,”num”:123,”sex”:”male”}