1、JSON官方
2、GSON
3、FastJSON
4、jackson
1.
//解析
@Test
public void test1() {
// 对象嵌套数组嵌套对象
String json1 = "{'id':1,'name':'JAVAEE-1703','stus':[{'id':101,'name':'刘一','age':16}]}";
// 数组
String json2 = "['北京','天津','杭州']";Gson gson=new Gson();
//1、
//解析对象:第一个参数:待解析的字符串 第二个参数结果数据类型的Class对象
Grade grade=gson.fromJson(json1, Grade.class);
System.out.println(grade);//2、
//解析数组要求使用Type
ArrayList<String> list=gson.fromJson(json2,
new TypeToken<ArrayList<String>>(){}.getType());
System.out.println(list);
}
//生成
@Test
public void test2(){
ArrayList<Student> list=new ArrayList<>();
for(int i=1;i<3;i++){
list.add(new Student(101+i, "码子", 20+i));
}
Grade grade=new Grade(100001,"张三", list);
Gson gson=new Gson();
//将对象转换为诶JSON格式字符串
String json=gson.toJson(grade);
System.out.println(json);}
2
JSONObject jsonObject = new JSONObject(message); JSONArray words = jsonObject.getJSONArray("words_result"); //List<TestBean.WordsResultBean> wordsResultBeanList = new ArrayList<>(); String strWord = ""; if(null != words){ for(int i =0;i < words.length();i++){ JSONObject jObject3=words.getJSONObject(i); strWord += jObject3.getString("words"); /*TestBean.WordsResultBean wordsResultBean = new TestBean.WordsResultBean(); wordsResultBean.setWords(jObject3.getString("words")); wordsResultBeanList.add(wordsResultBean);*/ } }
//解析第一层---对象
JSONObject jObject1=new JSONObject(json1);
Grade grade=new Grade();
grade.setId(jObject1.getInt("id"));
grade.setName(jObject1.getString("name"));
ArrayList<Student> stus=new ArrayList<>();
grade.setStus(stus);
//解析第二层----数组
JSONArray jsonArray2=jObject1.getJSONArray("stus");
//遍历数组获取元素----对象
for(int i=0;i<jsonArray2.length();i++){
//解析第三层----对象
JSONObject jObject3=jsonArray2.getJSONObject(i);
Student student=new Student(jObject3.getInt("id"), jObject3.getString("name"), jObject3.getInt("age"));
grade.getStus().add(student);
}System.out.println(grade);
//获取数组对象
JSONArray jArray=new JSONArray(json2);
ArrayList<String> list=new ArrayList<>();
//遍历获取元素
for(int i=0;i<jArray.length();i++){
//jArray.optString(i);//等价于getXXX
list.add(jArray.getString(i));
}
System.out.println("解析结果:"+list);
//生成JSON
@Test
public void test2() throws JSONException{
JSONObject jo1=new JSONObject();
jo1.put("id", 1001);
jo1.put("name", "范老");
jo1.put("age", 20);
JSONObject jo2=new JSONObject();
jo2.put("id", 1002);
jo2.put("name", "平平");
jo2.put("age", 19);
JSONArray ja2=new JSONArray();
ja2.put(jo1);
ja2.put(jo2);
JSONObject jo3=new JSONObject();
jo3.put("id", 11);
jo3.put("name", "JAVAEE-1704");
jo3.put("stus",ja2);
String json=jo3.toString();
System.out.println(json);}
3.//解析
@Test
public void test1() {
// 对象嵌套数组嵌套对象
String json1 = "{'id':1,'name':'JAVAEE-1703','stus':[{'id':101,'name':'刘铭','age':16}]}";
// 数组
String json2 = "['北京','天津','杭州']";
//1、
//静态方法
Grade grade=JSON.parseObject(json1, Grade.class);
System.out.println(grade);
//2、
List<String> list=JSON.parseArray(json2, String.class);
System.out.println(list);
}
//生成
@Test
public void test2(){
ArrayList<Student> list=new ArrayList<>();
for(int i=1;i<3;i++){
list.add(new Student(101+i, "码子", 20+i));
}
Grade grade=new Grade(100001,"张三", list);
String json=JSON.toJSONString(grade);
System.out.println(json);
}
4.
//解析
@Test
public void test1() throws Exception{
// 对象嵌套数组嵌套对象
String json1 = "{\"id\":1,\"name\":\"JAVAEE-1703\",\"stus\":[{\"id\":101,\"name\":\"刘一\",\"age\":16}]}";
// 数组
String json2 = "[\"北京\",\"天津\",\"杭州\"]";
//1、
ObjectMapper mapper=new ObjectMapper();
Grade grade=mapper.readValue(json1, Grade.class);
System.out.println(grade);
//2、
ArrayList<String> list=mapper.readValue(json2,
new TypeReference<ArrayList<String>>() {
});
System.out.println(list);}
//生成
@Test
public void test2() throws JsonProcessingException{
ArrayList<Student> list=new ArrayList<>();
for(int i=1;i<3;i++){
list.add(new Student(101+i, "码子", 20+i));
}
Grade grade=new Grade(100001,"张三", list);
ObjectMapper mapper=new ObjectMapper();
//将对象转换为JSON格式字符串
String json=mapper.writeValueAsString(grade);
System.out.println(json);
}