json-lib.jar开发包使用:
依赖包:
commons-beanutils.jar;
commons-httpclient.jar;
commons-lang.jar;
ezmorph.jar;不少人使用时会提示net.sf.ezmorph.xxx找不到,就是缺这个:
morph-1.0.1.jar
相关链接:
http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
http://morph.sourceforge.net/
使用过程中问题:
1,把bean转化为json格式时老提示如下错误:
Exception in thread "main" net.sf.json.JSONException: java.lang.NoSuchMethodException: Property ‘name‘ has no getter method
解决:声明bean为public class xxx,必须是public,我用默认类型(class xxx)都不行
2,Exception in thread "main" java.lang.NoSuchMethodError: org.apache.commons.lang.ArrayUtils.toObject([C)[Ljava/lang/Character;
原因:定义属性如下:private char[] options = new char[] { ‘a‘, ‘f‘ };好像不能处理这种类型的
3, private String func1 = "function(i){ return this.options[i]; }";
和
private JSONFunction func2 = new JSONFunction(new String[] { "i" },
"return this.options[i];");
转换后显示结果差不多:
{"func1":function(i){ return this.options[i];,"func2":function(i){ return this.options[i]; }}
测试类:
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import net.sf.json.JSONArray;
- import net.sf.json.JSONObject;
- public class Json {
- public static void main(String[] args) {
- Json j = new Json();
- j.bean2json();
- }
- 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"]
- }
- public void map2json() {
- Map
- 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 json = JSONObject.fromObject(map);
- System.out.println(json);
- // prints
- // ["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){
- // return this.arr[i]; }]
- }
- 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]; }}
- */
- }
- public void json2bean() {
- String json = "{name=/"json2/",func1:true,pojoId:1,func2:function(a){ return a; },options:[‘1‘,‘2‘]}";
- JSONObject jb = JSONObject.fromString(json);
- JSONObject.toBean(jb, MyBean.class);
- System.out.println();
- }
- }
操作的bean:
- import net.sf.json.JSONFunction;
- 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];");
- // getters & setters
- ......
- }
使用JSON的方法
JSON 即 JavaScript Object Natation,它是一种轻量级的数据交换格式,非常适合于服务器与 JavaScript 的交互。本文将快速讲解 JSON 格式,并通过代码示例演示如何分别在客户端和服务器端进行 JSON 格式数据的处理。
Json必需的包
commons-httpclient-3.1.jar
commons-lang-2.4.jar
commons-logging-1.1.1.jar
json-lib-2.2.3-jdk13.jar
ezmorph-1.0.6.jar
commons-collections-3.2.1.jar
以上包可以从
http://commons.apache.org/index.html
http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
中下载到。
出现java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher错误是因为没有导入ezmorph.jar文件或版本不对。
出现java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap错误是因为没有导入commons-collections.jar文件或版本不对。
Java代码转换成json代码
1. List集合转换成json代码
List list = new ArrayList(); list.add( "first" ); list.add( "second" ); JSONArray jsonArray2 = JSONArray.fromObject( list ); |
2. Map集合转换成json代码
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 json = JSONObject.fromObject(map); |
3. Bean转换成json代码
JSONObject jsonObject = JSONObject.fromObject(new JsonBean()); |
4. 数组转换成json代码
boolean[] boolArray = new boolean[] { true, false, true }; JSONArray jsonArray1 = JSONArray.fromObject(boolArray); |
5. 一般数据转换成json代码
JSONArray jsonArray3 = JSONArray.fromObject("[‘json‘,‘is‘,‘easy‘]" ); |
6. beans转换成json代码
List list = new ArrayList(); JsonBean2 jb1 = new JsonBean2(); jb1.setCol(1); jb1.setRow(1); jb1.setValue("xx"); JsonBean2 jb2 = new JsonBean2(); jb2.setCol(2); jb2.setRow(2); jb2.setValue(""); list.add(jb1); list.add(jb2); JSONArray ja = JSONArray.fromObject(list); |