解析Json
在网页中想后台传递多个数据时，有时数据还是多个动态列表，数据很复杂时，JavaScript程序员喜欢把他们作为json串进行处理，后台收到后需要对json字符串进行解析，幸好有JSON-lib，这个Java类包用于把bean,map和XML转换成JSON并能够把JSON转回成bean和DynaBean。
下载地址:http://json-lib.sourceforge.net/
今天自己写了一个JSON的例子如下，可以一调用就出了问题，报下面这个异常：
java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
上网上搜了一下才知道原来在使用JSON的使用的时候，不光要导入JSON这个包，同时还要导入另外三个包
总之，共需要下面的 jars，json-lib方可使用：
commons-beanutils-1.7.0.jar
commons-lang-2.1.jar
ezmorph-1.0.2.jar
json-lib-1.1-jdk15.jar
例子如下：
package json;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import net.sf.json.JSONArray;
import net.sf.json.JSONException;
import net.sf.json.JSONObject;
public class Test {
/**
*
* @param args
*
* @author wen
*/
public static void main(String[] args) {
// test1();
// test2();
String json = "{"
+ "1:"
+ "{"
+ "1:"
+ "{jhinfo:"
+ "['计划一','知行网','www.zhixing123.cn'],"
+ "jhrate:"
+ "['1-5:10.0','6-100:5.0/1']"
+ "},"
+ "2:"
+ "{jhinfo:"
+ "['计划二','知行网','www.zhixing123.cn'],"
+ "jhrate:"
+ "['1-100:100.0']},"
+ "3:{jhinfo:['计划三','知行网','www.zhixing123.cn'],jhrate:['1-100:150.0/7']}"
+ "},"
+ "2:{"
+ "4:"
+ "{jhinfo:['年计划','知行网','www.zhixing123.cn'],"
+ "jhrate:['365-365:1000.0']}"
+ "}"
+ "}";
try {
JSONObject jsonObject = JSONObject.fromObject(json);
String name = jsonObject.getString("1");
String address = jsonObject.getString("2");
System.out.println("name is:" + name);
System.out.println("address is:" + address);
Iterator it = jsonObject.keys();
while (it.hasNext()) {
System.out.println(jsonObject.get(it.next()));
}
test2();
test1();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
*
* json对象，解析出数组
*
* @author wen
*/
private static void test2() {
String json = "{'name': '亲亲宝宝','array':[{'a':'111','b':'222','c':'333'},{},{'a':'999'}],'address':'亲亲宝宝'}";
try {
JSONObject jsonObject = JSONObject.fromObject(json);
String name = jsonObject.getString("name");
String address = jsonObject.getString("address");
System.out.println("name is:" + name);
System.out.println("address is:" + address);
JSONArray jsonArray = jsonObject.getJSONArray("array");
for (int i = 0; i < jsonArray.size(); i++) {
System.out.println("item " + i + " :" + jsonArray.getString(i));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
*
* json数组 转换，数组以[开头
*
* @author wen
*/
private static void test1() {
boolean[] boolArray = new boolean[] { true, false, true };
JSONArray jsonArray1 = JSONArray.fromObject(boolArray);
System.out.println(jsonArray1);
// prints [true,false,true]
List list = new ArrayList();
list.add("first");
list.add("second");
JSONArray jsonArray2 = JSONArray.fromObject(list);
System.out.println(jsonArray2);
// prints ["first","second"]
JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']");
System.out.println(jsonArray3);
// prints ["json","is","easy"]
}
}