fastJSON使用（一）——对象转换成json

fastJSON使用（一）——对象转换成json

下面是Maven的依赖包：

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.8</version>
</dependency>
首先一个简单的程序Main.java

package fastJSON;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSON;
public class Main {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(123);
String s = JSON.toJSONString("ABCDEFG");
System.out.println(s);
int[] intarr = new int[5];
for (int i = 0; i < intarr.length; i++) {
intarr[i] = i;
}
String intarrJSON = JSON.toJSONString(intarr);
System.out.println(intarrJSON);
double[] darr = {1.2,2.3,2.4,12.5,23.1};
System.out.println(JSON.toJSON(darr));
Map<String,Object> m = new HashMap<String, Object>();
m.put("param1", "value1");
m.put("param2", "value2");
m.put("param3", "value3");
m.put("param4", "value4");
m.put("param5", "value5");
System.out.println(JSON.toJSON(m));
Map<String,Object> m2 = new HashMap<String, Object>();
m2.put("p1", "v1");
m2.put("p2", "v2");
m2.put("p3", "v3");
m2.put("p4", "v4");
m2.put("p5", "v5");
System.out.println(JSON.toJSON(m2));
List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
list.add(m);
list.add(m2);
System.out.println(JSON.toJSONString(list));

Map<String,Object> mm = new HashMap<String,Object>();
mm.put("list",list);
mm.put("count", 2);
System.out.println(JSON.toJSONString(mm));

Student student = new Student("s1",12,new Date());
System.out.println(JSON.toJSONString(student));
Student student1 = new Student("s2",12,new Date());
Student student2 = new Student("s3",12,new Date());
Student student3 = new Student("s4",12,new Date());
Student student4 = new Student("s5",12,new Date());
Student student5 = new Student("s6",12,new Date());
List<Student> studentList = new ArrayList<Student>();
studentList.add(student);
studentList.add(student1);
studentList.add(student2);
studentList.add(student3);
studentList.add(student4);
studentList.add(student5);
System.out.println(JSON.toJSONString(studentList));
}

}

Student.java

package fastJSON;

import java.util.Date;

public class Student {
private String name;
private int age;
private Date date;

public Student() {
// TODO Auto-generated constructor stub
}

public Student(String name,int age,Date date){
this.name = name;
this.age = age;
this.date = date;
}

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;
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

}

这里的Student.java需要有对应的get和set，还需要有构造函数，如果那个属性没有get函数，那么解析出来的JSON串中就没有对应的属性，下面是结果。

123
"ABCDEFG"
[0,1,2,3,4]
[1.2,2.3,2.4,12.5,23.1]
{"param5":"value5","param3":"value3","param4":"value4","param1":"value1","param2":"value2"}
{"p1":"v1","p2":"v2","p3":"v3","p4":"v4","p5":"v5"}
[{"param5":"value5","param3":"value3","param4":"value4","param1":"value1","param2":"value2"},{"p1":"v1","p2":"v2","p3":"v3","p4":"v4","p5":"v5"}]
{"count":2,"list":[{"param5":"value5","param3":"value3","param4":"value4","param1":"value1","param2":"value2"},{"p1":"v1","p2":"v2","p3":"v3","p4":"v4","p5":"v5"}]}
{"age":12,"date":1465475917155,"name":"s1"}
[{"age":12,"date":1465475917155,"name":"s1"},{"age":12,"date":1465475917175,"name":"s2"},{"age":12,"date":1465475917175,"name":"s3"},{"age":12,"date":1465475917175,"name":"s4"},{"age":12,"date":1465475917175,"name":"s5"},{"age":12,"date":1465475917175,"name":"s6"}]