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);
            //obj.getjsonarray(key)
            //obj.getjsonobject(key)
            //obj.getstring(key);
        } catch (exception e) {
            e.printstacktrace();
        }
    }

4、完整例子

package com.inspur.demo.json;

import java.text.simpledateformat;
import java.util.arraylist;
import java.util.calendar;
import java.util.date;
import java.util.hashmap;
import java.util.list;
import java.util.map;

import net.sf.ezmorph.object.datemorpher;
import net.sf.json.json;
import net.sf.json.jsonobject;
import net.sf.json.jsonserializer;
import net.sf.json.jsonconfig;
import net.sf.json.processors.jsonvalueprocessor;
import net.sf.json.util.cycledetectionstrategy;
import net.sf.json.util.jsonutils;
import net.sf.json.util.propertyfilter;

/**
 * json-lib操作json数据
 */
public class jsonlibcase {
    /**
     * 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;
    }
    
    /**
     * 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);
            //obj.getjsonarray(key)
            //obj.getjsonobject(key)
            //obj.getstring(key);
        } catch (exception e) {
            e.printstacktrace();
        }
    }
    
    public static void main(string[] args) {
        serialize();
        deserialize();
    }
    
    static class datejsonvalueprocessor implements jsonvalueprocessor {
        @override
        public object processarrayvalue(object value, jsonconfig arg1) {
            return process(value);
        }

        @override
        public object processobjectvalue(string key, object value, jsonconfig arg2) {
            return process(value);
        }
        private object process(object value) {
            try {
                if (value instanceof date) {
                    simpledateformat sdf = new simpledateformat("yyyy-mm-dd hh:mm:ss");
                    return sdf.format((date) value);
                }
            } catch (exception e) {
                e.printstacktrace();
            }
            return value == null ? "" : value.tostring();
        }
    }
}

package com.inspur.demo.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) + "]";
    }
}