java对象和json互相转换-蒲公英云

jar包

在这里插入图片描述

pom.xml

<project 
xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.java1234</groupId>
  <artifactId>TestDemo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>TestDemo</name>
  <url>http://maven.apache.org</url>
  <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
     <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.5</version>
    </dependency>
    <dependency>
        <groupId>commons-beanutils</groupId>
        <artifactId>commons-beanutils</artifactId>
        <version>1.8.0</version>
    </dependency>
    <dependency>
        <groupId>commons-collections</groupId>
        <artifactId>commons-collections</artifactId>
        <version>3.2.1</version>
    </dependency>
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>net.sf.ezmorph</groupId>
        <artifactId>ezmorph</artifactId>
        <version>1.0.6</version>
    </dependency>
  </dependencies>
</project>

其中的json-lib-2.4-jdk15.jar是单独下载的，在maven仓库里没有

Student.java

package com.java1234;
public class Student {
    private Integer id;
    private String name;
    private Integer age;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public Student(Integer id, String name, 
Integer age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }
}

测试类：

package com.java1234.test;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.java1234.Student;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class Test1 {
    @Before
    public void setUp() throws Exception {
    }
    @After
    public void tearDown() throws Exception {
    }
    /**
     * 测试单个对象转<u>json</u>，用JSONObject
     */
    @Test
    public void test() {
        Student student=new Student(1,"小王",23);
        JSONObject 
jsonObject=JSONObject.fromObject(student);
        String json=jsonObject.toString();
        System.out.println(json);//{"age":23,"id":1,"name":"小王"}
    }
    /**
     * 测试list转JSON，转集合用JSONArray，会产生[]
     */
    @Test
    public void test2() {
        List<Student> list=new 
ArrayList<Student>();
        list.add(new Student(1,"小刘",22));
        list.add(new Student(2,"李大全",42));
        list.add(new Student(3,"大刘",32));
        JSONArray 
jsonArray=JSONArray.fromObject(list);
        String json=jsonArray.toString();
        System.out.println(json);//[{"age":22,"id":1,"name":"小刘"},{"age":42,"id":2,"name":"李大全"},{"age":32,"id":3,"name":"大刘"}]
    }
    /**
     * 测试map转JSON，转单个对象用JSONObject
     */
    @Test
    public void test3() {
        Map<String,Student> map=new 
HashMap<String,Student>();
        map.put("1", new Student(1,"小刘",22));
        map.put("2",new Student(2,"李大全",42));
        map.put("3",new Student(3,"大刘",32));
        JSONObject 
jsonObject=JSONObject.fromObject(map);
        String json=jsonObject.toString();
        System.out.println(json);//{"1":{"age":22,"id":1,"name":"小刘"},"2":{"age":42,"id":2,"name":"李大全"},"3":{"age":32,"id":3,"name":"大刘"}}
    }
    /**
     * 手动创建JSONObject与JSONOArray
     */
    @Test
    public void test4() {
        JSONObject jsonObject=new JSONObject();
        jsonObject.put("id","1");
        jsonObject.put("name","小华");
        jsonObject.put("age",23);
        System.out.println(jsonObject.toString());//{"id":"1","name":"小华","age":23}
        JSONObject jsonObject2=new JSONObject();
        jsonObject2.put("id","2");
        jsonObject2.put("name","小华2");
        jsonObject2.put("age",33);
        System.out.println(jsonObject2.toString()); 
//{"id":"2","name":"小华2","age":33}
        JSONArray jsonArray=new JSONArray();
        jsonArray.add(jsonObject);
        jsonArray.add(jsonObject2);
        System.out.println(jsonArray.toString());//[{"id":"1","name":"小华","age":23},{"id":"2","name":"小华2","age":33}]
    }
}