工程中所需的jar包,因?yàn)樵诰W(wǎng)上不太好找，所以我將它放到我的網(wǎng)盤(pán)里了，如有需要隨便下載。
1.簡(jiǎn)單的解析json字符串
首先將json字符串轉(zhuǎn)換為json對(duì)象，然后再解析json對(duì)象，過(guò)程如下。
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JSONObject jsonObject = JSONObject.fromObject(jsonStr); |
根據(jù)json中的鍵得到它的值
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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.將json字符串轉(zhuǎn)換為java對(duì)象
同樣先將json字符串轉(zhuǎn)換為json對(duì)象，再將json對(duì)象轉(zhuǎn)換為java對(duì)象，如下所示。
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JSONObject obj = new JSONObject().fromObject(jsonStr);//將json字符串轉(zhuǎn)換為json對(duì)象 |
將json對(duì)象轉(zhuǎn)換為java對(duì)象
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Person jb = (Person)JSONObject.toBean(obj,Person.class);//將建json對(duì)象轉(zhuǎn)換為Person對(duì)象 |
3.將java對(duì)象轉(zhuǎn)換為json字符串
先將java對(duì)象轉(zhuǎn)換為json對(duì)象，在將json對(duì)象轉(zhuǎn)換為json字符串
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JSONObject json = JSONObject.fromObject(obj);//將java對(duì)象轉(zhuǎn)換為json對(duì)象String str = json.toString();//將json對(duì)象轉(zhuǎn)換為字符串 |
完整代碼如下：
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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); } //將json字符串轉(zhuǎn)換為java對(duì)象 public Person JSON2Object(){ //接收{(diào)}對(duì)象，此處接收數(shù)組對(duì)象會(huì)有異常 if(jsonStr.indexOf("[") != -1){ jsonStr = jsonStr.replace("[", ""); } if(jsonStr.indexOf("]") != -1){ jsonStr = jsonStr.replace("]", ""); } JSONObject obj = new JSONObject().fromObject(jsonStr);//將json字符串轉(zhuǎn)換為json對(duì)象 Person jb = (Person)JSONObject.toBean(obj,Person.class);//將建json對(duì)象轉(zhuǎn)換為Person對(duì)象 return jb;//返回一個(gè)Person對(duì)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; } } |
將java對(duì)象轉(zhuǎn)換為json字符串
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package baz.cons; import net.sf.json.JSONObject; /** * 將java對(duì)象轉(zhuǎn)換為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);//將java對(duì)象轉(zhuǎn)換為json對(duì)象 String str = json.toString();//將json對(duì)象轉(zhuǎn)換為字符串 return str; } } |
測(cè)試類(lèi)：
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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) { //將字符串轉(zhuǎn)換為json對(duì)象，然后根據(jù)建得到相應(yīng)的值 ParseJson pj = new ParseJson("{\"name\":\"gu\",\"num\":123456,\"sex\":\"male\",\"age\":24}"); pj.parse(); //將一個(gè)json字符串轉(zhuǎn)換為java對(duì)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()); //將一個(gè)java對(duì)象轉(zhuǎn)換為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); } } |
測(cè)試輸出如下：
gu 123456 male 24
Name:gu
Num:123456
Sex:male
age:24
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{"age":23,"name":"gu1","num":123,"sex":"male"} |
這只是最簡(jiǎn)單使用方法，其他的使用我會(huì)在后期中更新。以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://blog.csdn.net/gchb9527/article/details/8688279
