Java编程之JSON_java的json编程-优快云博客

本文介绍了如何使用Java将各种类型的对象（如数组、集合、Map及JavaBean等）转换为JSON格式。通过示例展示了从简单数组到复杂JavaBean对象的转换过程，并解释了如何利用静态工厂方法实现这一目标。

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从Java数组或者集合中创建数组，最简单的办法就是通过静态工厂方法JSONArray。

boolean[] boolArray = new boolean[]{true,false,true};
JSONArray jsonArray = JSONArray.fromObject(boolArray);
System.out.println(jsonArray);//[true,false,true]


    List list = new ArrayList();
    list.add("first");
    list.add("second");
    JSONArray jsonArray = JSONArray.fromObject(list);
    System.out.println(jsonArray);//["first","second"]

JSONArray jsonArray = JSONArray.fromObject("['JSON','IS','GOOD']");
System.out.println(jsonArray); //["JSON","IS","GOOD"]

从Map、JavaBean到JSON对象

  /*map对象到Java对象*/
  Map map = new HashMap();
  map.put("name", "json");
  map.put("bool", Boolean.TRUE);
  map.put("int", new Integer(1));
  map.put("arr", new String[]{"b","a"});
  map.put("func", "function(i){ return this.arr[i]}");

  JSONObject jsonObject = JSONObject.fromObject(map);
  //{"arr":["b","a"],"bool":true,"func":function(i){ return 
  //  this.arr[i]},"name":"json","int":1}
  System.out.println(jsonObject);

public class MyBean {
   private String name = "json";
   private int pojoId = 1;
   private char[] options = new char[]{'a','b'};
   private String func1 = "function(i){return this.options[i];";
   private JSONFunction func2 =new JSONFunction(new String[]{"i"},"return this.options[i];");
   //省略getter、setter方法

JSONObject jsonObject = JSONObject.fromObject(new MyBean());
System.out.println(jsonObject);
/*{"func1":"function(i){return this.options[i];","func2":function(i){ return this.options[i]; },"name":"json","options":["a","b"],"pojoId":1}*/