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Java解析Json字符串--数组或列表
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Json示例：
[
{
"age": 25,
"gender": "female",
"grades": "三班",
"name": "露西",
"weight": 51.3
},
{
"age": 26,
"gender": "male",
"grades": "三班",
"name": "杰克",
"weight": 66.5
},
{
"age": 25,
"gender": "female",
"grades": "三班",
"name": "莉莉",
"weight": 55
}
]
我们来解析一下这个Json字符串。
首先，因为此Json字符串最外边是由一个中括弧”[]”包裹，那么，最终我们会用数组或者列表来接收它。
接下来，我们能看到中括弧里边有三个同级的大括弧，并且每个大括弧里包含的内容是相同的，大括弧我们可以对应创建一个类，我们创建一个类Student.java，并对应大括弧内的元素，定义相应的成员变量，生成get/set方法。
我们生成的Student.java如下：
package com.bean; /**
* 学生
*/
public class Student { private int age;//年龄
private String gender;//性别，male/female
private String grades;//班级
private String name;//姓名
private float weight;//体重 public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getGrades() {
return grades;
}
public void setGrades(String grades) {
this.grades = grades;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getWeight() {
return weight;
}
public void setWeight(float weight) {
this.weight = weight;
} }
解析成数组或列表：
package com.test; import java.util.ArrayList;
import java.util.List; import net.sf.json.JSONArray; import com.bean.Student; public class Domain { @SuppressWarnings("unchecked")
public static void main(String[] args) { String jsonStr = "[{\"age\": 25,\"gender\": \"female\",\"grades\": \"三班\",\"name\": \"露西\",\"weight\": 51.3},{\"age\": 26,\"gender\": \"male\",\"grades\": \"三班\",\"name\": \"杰克\",\"weight\": 66.5},{\"age\": 25,\"gender\": \"female\",\"grades\": \"三班\",\"name\": \"莉莉\",\"weight\": 55}]"; JSONArray jsonArray = JSONArray.fromObject(jsonStr); Student[] stus = new Student[3];
List<Student> list = new ArrayList<Student>(); stus = (Student[]) JSONArray.toArray(jsonArray, Student.class);//转换成数组
list = (List<Student>) JSONArray.toCollection(jsonArray, Student.class);//转换成列表 }
}
通过数组或者列表生成Json字符串：
package com.test; import java.util.ArrayList;
import java.util.List; import net.sf.json.JSONArray; import com.bean.Student; public class Domain { @SuppressWarnings("unchecked")
public static void main(String[] args) { Student stu1 = new Student();
Student stu2 = new Student();
Student stu3 = new Student(); stu1.setAge(25);
stu1.setGender("female");
stu1.setGrades("三班");
stu1.setName("露西");
stu1.setWeight(51.3f); stu2.setAge(26);
stu2.setGender("male");
stu2.setGrades("三班");
stu2.setName("杰克");
stu2.setWeight(66.5f); stu3.setAge(25);
stu3.setGender("female");
stu3.setGrades("三班");
stu3.setName("莉莉");
stu3.setWeight(55.0f); Student[] stus = new Student[3];
List<Student> list = new ArrayList<Student>(); stus[0] = stu1;
stus[1] = stu2;
stus[2] = stu3; list.add(stu1);
list.add(stu2);
list.add(stu3); String jsonStr1 = JSONArray.fromObject(stus).toString();
String jsonStr2 = JSONArray.fromObject(list).toString(); System.out.println(jsonStr1);
System.out.println(jsonStr2); }
}
