Java里如何应用Json格式数据

JSON是一种很简洁很重要的数据格式,通常用来交换传输数据,广泛使用于JavaScript技术中,并逐渐在各种流行编程语言中火了起来。在Java中也有一个JSON的库,用来重要作用就是Java对象与JSON、XML数据的相互转换,有着重要的应用。
    环境:JDK5 , json-lib-2.3-jdk15
    所依赖的包:json-lib-2.3-jdk15.jar,commons-collections.jar,commons- lang.jar,commons-logging.jar,commons-beanutils.jar,ezmorph-1.0.6.jar,xom-1.1.jar
    java中各种类型所对应的json格式:
    1.数组或集合-->JSON串
    public static void test1() {
    System.out.println("------------数组或集合-->JSON串----------");
    boolean[] boolArray = new boolean[]{true, false, true};
    JSONArray jsonArray1 = JSONArray.fromObject(boolArray);
    System.out.println(jsonArray1);
    //输出格式: [true,false,true]
    List list = new ArrayList();
    list.add("first");
    list.add("second");
    JSONArray jsonArray2 = JSONArray.fromObject(list);
    System.out.println(jsonArray2);
    //输出格式: ["first","second"]
    JSONArray jsonArray3 = JSONArray.fromObject("[json,is,easy]");
    System.out.println(jsonArray3);
    //输出格式: ["json","is","easy"]
    }
    2.Object|Map-->JSON串
    public static void test2() {
    System.out.println("------------Object|Map-->JSON串----------");
    Map map = new HashMap();
    map.put("name", "json");
    map.put("bool", Boolean.TRUE);
    map.put("int", new Integer(1));
    map.put("arr", new String[]{"a", "b"});
    map.put("func", "function(i){ return this.arr[i]; }");
    JSONObject jsonObject1 = JSONObject.fromObject(map);
    System.out.println(jsonObject1);
    //输出格式: {"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"bool":true,"name":"json"}
    JSONObject jsonObject2 = JSONObject.fromObject(new MyBean());
    System.out.println(jsonObject2);
    //输出格式: {"func1":function(i){ return this.options[i]; },"func2":function(i){ return this.options[i]; },"name":"json","options":["a","f"],"pojoId":1}
    }
    public class MyBean {
    private String name = "json";
    private int pojoId = 1;
    private char[] options = new char[]{a, f};
    private String func1 = "function(i){ return this.options[i]; }";
    private JSONFunction func2 = new JSONFunction(new String[]{"i"}, "return this.options[i];");
    public String getName() {
    return name;
    }
    public void setName(String name) {
    this.name = name;
    }
    public int getPojoId() {
    return pojoId;
    }
    public void setPojoId(int pojoId) {
    this.pojoId = pojoId;
    }
    public char[] getOptions() {
    return options;
    }
    public void setOptions(char[] options) {
    this.options = options;
    }
    public String getFunc1() {
    return func1;
    }
    public void setFunc1(String func1) {
    this.func1 = func1;
    }
    public JSONFunction getFunc2() {
    return func2;
    }
    public void setFunc2(JSONFunction func2) {
    this.func2 = func2;
    }
    }

3.JSON串-->Object
    public static void test3() {
    System.out.println("------------JSON串-->Object----------");
    String json1 = "{name="json",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";
    JSONObject jsonObject1 = JSONObject.fromObject(json1);
    Object bean1 = JSONObject.toBean(jsonObject1);
    System.out.println(bean1);
    //net.sf.ezmorph.bean.MorphDynaBean@10dd1f7[
    //    {double=2.2, func=function(a){ return a; }, int=1, name=json, bool=true, array=[1, 2]}
    //]
    String json2 = "{bool:true,integer:1,string:"json"}";
    JSONObject jsonObject2 = JSONObject.fromObject(json2);
    BeanA bean2 = (BeanA) JSONObject.toBean(jsonObject2, BeanA.class);
    System.out.println(bean2);
    // BeanA{bool=true, integer=1, string=json}
    }
    public class BeanA {
    private boolean bool;
    private Integer integer;
    private String string;
    public boolean isBool() {
    return bool;
    }
    public void setBool(boolean bool) {
    this.bool = bool;
    }
    public Integer getInteger() {
    return integer;
    }
    public void setInteger(Integer integer) {
    this.integer = integer;
    }
    public String getString() {
    return string;
    }
    public void setString(String string) {
    this.string = string;
    }
    @Override
    public String toString() {
    return "BeanA{"bool=" + bool +", integer=" + integer +", string=" + string + +"}";
    }
    }
    4.JSON串-->XML
    public static void test4() {
    System.out.println("------------JSON串-->XML----------");
    JSONObject json = new JSONObject(true);
    String xml = new XMLSerializer()。write(json);
    System.out.println(xml);
    JSONObject json1 = JSONObject.fromObject("{"name":"json","bool":true,"int":1}");
    String xml1 = new XMLSerializer()。write(json1);
    System.out.println(xml1);
    JSONArray json2 = JSONArray.fromObject("[1,2,3]");
    String xml2 = new XMLSerializer()。write(json2);
    System.out.println(xml2);
    }
    5.XML-->JSON串
    public static void test5() {
    System.out.println("------------XML-->JSON串----------");
    String xml = "" +
    "<a class="array"> " +
    "    <e type="function" params="i,j"> " +
    "            return matrix[i][j]; " +
    "    </e> "

原文地址:https://www.cnblogs.com/biggestfish/p/2925367.html