android jackson 解析json字符串,android:json解析的两个工具：Gson和Jackson的使用小样例...
1.簡(jiǎn)單介紹
json是android與server通信過(guò)程中經(jīng)常使用的數(shù)據(jù)格式，比如。例如以下是一個(gè)json格式的字符串：
{"address":"Nanjing","name":"NUPT","students":[{"name":"stu1","id":"10000","age":20},{"name":"stu1","id":"10001","age":21},{"name":"stu1","id":"10002","age":22}]}
2.android中經(jīng)常使用的兩個(gè)json庫(kù)為：Gson和Jackson，一下就看一下它們是怎樣將對(duì)象轉(zhuǎn)化為json字符串，以及怎樣將json字符串轉(zhuǎn)化為java對(duì)象。
定義Student類：
/*
* $filename: Student.java,v $
* $Date: 2014-5-12 $
* Copyright (C) ZhengHaibo, Inc. All rights reserved.
* This software is Made by Zhenghaibo.
*/
package com.example.testjson;
/*
*@author: ZhengHaibo
*web: http://blog.csdn.net/nuptboyzhb
*mail: [email?protected]
*2014-5-12 Nanjing,njupt,China
*/
public class Student {
private String name;
private String id;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
定義School類：
/*
* $filename: School.java,v $
* $Date: 2014-5-12 $
* Copyright (C) ZhengHaibo, Inc. All rights reserved.
* This software is Made by Zhenghaibo.
*/
package com.example.testjson;
import java.util.List;
/*
*@author: ZhengHaibo
*web: http://blog.csdn.net/nuptboyzhb
*mail: [email?protected]
*2014-5-12 Nanjing,njupt,China
*/
public class School {
private String name;
private String address;
List students;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public List getStudents() {
return students;
}
public void setStudents(List students) {
this.students = students;
}
}
初始化一個(gè)School的java對(duì)象，待使用：
private School initSchoolData(){
School school = new School();
school.setAddress("Nanjing");
school.setName("NUPT");
List list = new ArrayList();
for(int i= 0;i<3;i++){
Student student = new Student();
student.setAge(20+i);
student.setId("1000"+i);
student.setName("stu"+1);
list.add(student);
}
school.setStudents(list);
return school;
}
3.使用Gson。進(jìn)行java對(duì)象與json字符串之間的相互轉(zhuǎn)換
private void testGson(){
School school = initSchoolData();
Gson gson = new Gson();
//將對(duì)象轉(zhuǎn)化為json字符串
String jsonString = gson.toJson(school).toString();
//打印
System.out.println("GSON="+jsonString);
/******切割線*****/
//將字符串轉(zhuǎn)化為JSON對(duì)象
School resultSchool = gson.fromJson(jsonString, School.class);
//打印
System.out.println(resultSchool.getStudents().get(0).getName());
}
可見(jiàn)，Gson是通過(guò)toJson和fromJson兩個(gè)方法進(jìn)行轉(zhuǎn)換的，使用起來(lái)十分方便。
4.使用Jackson
private void testJackson(){
School school = initSchoolData();
ObjectMapper objectMapper = new ObjectMapper();
String jsonString = "";
//將對(duì)象轉(zhuǎn)化為Json字符串
try {
jsonString = objectMapper.writeValueAsString(school);
System.out.println("Jackson="+jsonString);
} catch (JsonProcessingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//將json字符串解析成java對(duì)象
try {
School resultSchool = objectMapper.readValue(jsonString, School.class);
//打印
System.out.println(resultSchool.getStudents().get(0).getName());
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
使用Jackson，主要是使用writeValueAsString和readValue這兩個(gè)方法。此外。Jackson的writeValue和readValue有非常多種參數(shù)類型，適用于多中場(chǎng)合。
注意：以上僅僅是這兩個(gè)工具類的基本使用方法，很多其它了解。參見(jiàn)官方文檔。
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