JSON字符串解析

1.1 JSON字符串取得单个key

使用方法: object.get(Object key) 或者 object.getString(String key)


String content = "{\"name\" : \"jack\"}";

try {

    JSONObject object = JSONObject.parseObject(content);

    String name = (String) object.get("name"); //jack

} catch (Exception e) {

}


String content = "{\"name\" : \"jack\"}";

try {

    JSONObject object = JSONObject.parseObject(content);

    String name2 = object.getString("name"); //jack

} catch (Exception e) {

}

1.2 JSON字符串获取实体类

使用方法: JSON.parseObject(String text, Class<T> clazz)


import java.io.Serializable;

import org.apache.commons.lang.builder.ToStringBuilder;

import org.apache.commons.lang.builder.ToStringStyle;

public class Student implements Serializable {

    private static final long serialVersionUID = 1L;

    private String name;

    private int age;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    @Override

    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}


String content = "{\"data\" : {\"name\" : \"jack\", \"age\" : 18}}";

try {

    JSONObject object = JSONObject.parseObject(content);

    JSONObject json = object.getJSONObject("data");

    Student student  = JSONObject.parseObject(json.toString(), Student.class);

    System.out.println(student);  // Student[name=jack,age=18]

} catch (Exception e) {

}

1.3 JSON字符串获取List实体类

使用方法: JSONArray.parseArray(String text, Class<T> clazz) 或者 JSON.parseArray(String text, Class<T> clazz)


String content = "{\"data\" : [{\"name\" : \"jack\", \"age\" : 18},{\"name\" : \"jack\", \"age\" : 18}]}";

try {

    JSONObject object = JSONObject.parseObject(content);

    Object objStudent = object.get("data");

    List<Student> studentArray = JSONArray.parseArray(objStudent.toString(), Student.class);

    System.out.println(Arrays.toString(studentArray.toArray())); // [Student[name=jack,age=18], Student[name=jack,age=18]]

} catch (Exception e) {

}

String content = "{\"data\" : [{\"name\" : \"jack\", \"age\" : 18},{\"name\" : \"jack\", \"age\" : 18}]}";

try {

    JSONObject object = JSONObject.parseObject(content);

    Object objStudent = object.get("data");

    List<Student> studentArray = JSON.parseArray(objStudent.toString(),Student.class); //

    System.out.println(Arrays.toString(studentArray.toArray())); // [Student[name=jack,age=18], Student[name=jack,age=18]]

} catch (Exception e) {

}

1.3.1 JSON字符串获取List实体类一层通用方法


public static <T> List<T> parseSyncResult(String result, Class<T> clazz){

        try {

            JSONObject jsonObject = JSONObject.parseObject(result);

            String data = jsonObject.getString("data");// data 根据实际情况调整

            return JSON.parseArray(data, clazz);

        } catch (Exception e) {

            return Collections.emptyList();

        }

    }

例子:


String content = "{\"data\" : [{\"name\" : \"jack\", \"age\" : 18},{\"name\" : \"jack\", \"age\" : 18}]}";

List<Student> studentArray = parseSyncResult(content,Student.class);

System.out.println(Arrays.toString(studentArray.toArray())); // [Student[name=jack,age=18], Student[name=jack,age=18]]

1.3.2 JSON字符串获取List实体类两层通用方法


public static <T> List<T> parseSyncResult(String result, Class<T> clazz) throws Exception{

    JSONObject jsonObject = JSONObject.parseObject(result);

    JSONArray jsonArray = jsonObject.getJSONObject("content").getJSONArray("data");// content和data根据实际情况调整

    return JSON.parseArray(jsonArray.toJSONString(), clazz);

}

例子:

String content = "{\"content\":{\"total\":2,\"data\":[{\"name\" : \"jack\", \"age\" : 18},{\"name\" : \"jack\", \"age\" : 18}]},\"msgs\":\"\",\"status\":200}";

List<Student> studentArray2 = parseSyncResult(content, Student.class); 

System.out.println(Arrays.toString(studentArray2.toArray())); // [Student[name=jack,age=18], Student[name=jack,age=18]]

最后编辑于：2019.04.01 16:19:05