工程中所需的jar包,因为在网上不太好找,所以我将它放到我的网盘里了,如有需要随便下载。
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。
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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。
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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
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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
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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
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{ "age" :23, "name" : "gu1" , "num" :123, "sex" : "male" } |
这只是最简单使用方法,其他的使用我会在后期中更新。以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/gchb9527/article/details/8688279