JSON - LIB使用

json-lib使用

发布者：周围，发布时间：2010年1月20日 上午1:56[更新时间：2010年5月25日 下午8:54]

数组 -> json public void arr2json() { boolean[] boolArray = new boolean[] { true, false, true }; JSONArray jsonArray = JSONArray.fromObject(boolArray); System.out.println(jsonArray); // prints [true,false,true] } public void list2json() { List list = new ArrayList(); list.add("first"); list.add("second"); JSONArray jsonArray = JSONArray.fromObject(list); System.out.println(jsonArray); // prints ["first","second"] } public void createJson() { JSONArray jsonArray = JSONArray.fromObject("['json','is','easy']"); System.out.println(jsonArray); // prints ["json","is","easy"] } 对象 -> json public void bean2json() { JSONObject jsonObject = JSONObject.fromObject(new MyBean()); System.out.println(jsonObject); /* * prints * {"func1":function(i){ return this.options[i]; * },"pojoId":1,"name":"json","func2":function(i){ return * this.options[i]; }} */ } json -> 对象 public void json2bean() { String json = "{name=\"json2\",func1:true,pojoId:1,func2:function(a){ return a; },options:['1','2'],\"options2\":\"\"}"; JSONObject jb = JSONObject.fromObject(json); MyBean temp = (MyBean) JSONObject.toBean(jb, MyBean.class); System.out.println(temp.getName()); } 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];"); private char[] optionss = new char[] { 'a', 'f' }; public String getName() { return name; } public char[] getOptions() { return options; } public void setOptions(char[] options) { this.options = options; } public char[] getOptionss() { return optionss; } public void setOptionss(char[] optionss) { this.optionss = optionss; } public void setName(String name) { this.name = name; } public int getPojoId() { return pojoId; } public void setPojoId(int pojoId) { this.pojoId = pojoId; } 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; } } 进阶， 属性过滤 //json转化属性过滤，忽略掉值为null的属性 JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setJsonPropertyFilter(new PropertyFilter() { public boolean apply(Object source, String name, Object value) { if (value == null) { return true; } return false; } }); return JSONObject.fromObject(new MyBean(), jsonConfig).toString(); } 日期格式处理 //json 日期处理 JsonConfig jsonConfig = new JsonConfig(); jsonConfig.registerJsonValueProcessor(java.util.Date.class, new DateJsonValueProcessor("yyyy-MM-dd")); return JSONObject.fromObject( 对象 , jsonConfig).toString(); import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import net.sf.json.JsonConfig; import net.sf.json.processors.JsonValueProcessor; public class DateJsonValueProcessor implements JsonValueProcessor { public static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd"; private DateFormat dateFormat; /** * 构造方法. * * @param datePattern 日期格式 */ public DateJsonValueProcessor(String datePattern) { try { dateFormat = new SimpleDateFormat(datePattern); } catch (Exception ex) { dateFormat = new SimpleDateFormat(DEFAULT_DATE_PATTERN); } } public Object processArrayValue(Object value, JsonConfig jsonConfig) { return process(value); } public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) { return process(value); } private Object process(Object value) { return dateFormat.format((Date) value); } }