Java操作JSON数据(1)--JSON-lib操作JSON数据

JSON-lib是一个java库，用于将bean、映射、集合、java数组和XML转换为JSON，或将JSON转为beans和DynaBeans。JSON-lib最后的版本是2.4，更新时间是2010年12月14日，在以前的项目或系统中用的用的较多；本文简单介绍下其使用方法，文中所使用到的软件版本：Java 1.8.0_191、JSON-lib 2.4。

1、引入依赖

<dependency>
    <groupId>net.sf.json-lib</groupId>
    <artifactId>json-lib</artifactId>
    <version>2.4</version>
    <classifier>jdk15</classifier>
</dependency>

2、序列化

public static String serialize() {
    MyBean bean = new MyBean();
    bean.setS("测试字符串");
    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.HOUR_OF_DAY, -1);
    bean.setD(calendar.getTime());
    JsonConfig config = new JsonConfig();
    //防止自包含
    config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);
    //Date类型转化
    config.registerJsonValueProcessor(Date.class, new DateJsonValueProcessor());
    //过滤s3字段
    config.setExcludes(new String[]{"s3"});
    //过滤值为null的字段
    config.setJsonPropertyFilter(new PropertyFilter() {
        @Override
        public boolean apply(Object arg0, String arg1, Object value) {
            return value == null;
        }
    });
    List<MyBean> list = new ArrayList<MyBean>();
    list.add(bean);
    Map<String, List<MyBean>> map = new HashMap<String, List<MyBean>>();
    map.put("data", list);
    JSON json = JSONSerializer.toJSON(map, config);
    String result = json.toString();
    System.out.println(json.toString());
    return result;
}

3、反序列化

public static void deserialize() {
    try {
        //处理日期类型
        JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(new String[]{"yyyy-MM-dd HH:mm:ss"}));
        String s = serialize();
        Map<String, Class<?>> classMap = new HashMap<String, Class<?>>();  
        classMap.put("data", MyBean.class);
        Map<String, List<MyBean>> map = (Map<String, List<MyBean>>) JSONObject.toBean(JSONObject.fromObject(s), Map.class, classMap);
        System.out.println(map);
        
        //直接通过api获取相应数据
        JSONObject obj = JSONObject.fromObject(s);
        JSONArray data = obj.getJSONArray("data");
        JSONObject bean = data.getJSONObject(0);
        System.out.println(bean.getString("s"));
        //...
    } catch (Exception e) {
        e.printStackTrace();
    }
}

4、完整例子

package com.abc.demo.general.json;

import java.util.Arrays;
import java.util.Date;

public class MyBean {
    private String s = "字符串";
    private String s2;
    private String s3 = "字符串3";
    private int i = 123;
    private Integer i2;
    private char c = '到';
    private char[] c2 = new char[]{'a', 'b'};
    private Date d = new Date();
    private Date[] d2 = new Date[]{new Date(), new Date()};
    public String getS() {
        return s;
    }
    public void setS(String s) {
        this.s = s;
    }
    public String getS2() {
        return s2;
    }
    public void setS2(String s2) {
        this.s2 = s2;
    }
    public String getS3() {
        return s3;
    }
    public void setS3(String s3) {
        this.s3 = s3;
    }
    public int getI() {
        return i;
    }
    public void setI(int i) {
        this.i = i;
    }
    public Integer getI2() {
        return i2;
    }
    public void setI2(Integer i2) {
        this.i2 = i2;
    }
    public char getC() {
        return c;
    }
    public void setC(char c) {
        this.c = c;
    }
    public char[] getC2() {
        return c2;
    }
    public void setC2(char[] c2) {
        this.c2 = c2;
    }
    public Date getD() {
        return d;
    }
    public void setD(Date d) {
        this.d = d;
    }
    public Date[] getD2() {
        return d2;
    }
    public void setD2(Date[] d2) {
        this.d2 = d2;
    }
    
    @Override
    public String toString() {
        return "MyBean [s=" + s + ", s2=" + s2 + ", s3=" + s3 + ", i=" + i + ", i2=" + i2 + ", c=" + c + ", c2="
                + Arrays.toString(c2) + ", d=" + d + ", d2=" + Arrays.toString(d2) + "]";
    }
}

MyBean.java