1使用net.sf.json ，所在包：json-lib-2.4-jdk15.jar
测试类：
package com.ultimate.ws.api;
// default package
public class Subscriptionevent implements java.io.Serializable {
private String userId;
private String countryCode;
private String subscriptionTier;
private String paymentType=null;
private String startDate=null;
private String expiryDate=null;
private String transactionId;
private String serviceCode;
...
}测试数据：
文件形式： String filePath="/xxx/test.json";
文件内容：
[{"subscriptionTier":"DELETE","startDate":null,"transactionId":"11111111111111111","paymentType":null,"expiryDate":null,"userId":"1111111111111111","countryCode":"CN","serviceCode":null},{"subscriptionTier":"DELETE","startDate":null,"transactionId":"222222222222222222","paymentType":null,"expiryDate":null,"userId":"22222222222222222222222","countryCode":"CN","serviceCode":null},{"subscriptionTier":"DELETE","startDate":null,"transactionId":"33333333333333333333","paymentType":null,"expiryDate":null,"userId":"333333333333333333333333","countryCode":"CN","serviceCode":null}]接口所接收的json格式：
{subscriptionEvents:[{"subscriptionTier":"DELETE","startDate":null,"transactionId":"11111111111111111","paymentType":null,"expiryDate":null,"userId":"1111111111111111","countryCode":"CN","serviceCode":null},{"subscriptionTier":"DELETE","startDate":null,"transactionId":"222222222222222222","paymentType":null,"expiryDate":null,"userId":"22222222222222222222222","countryCode":"CN","serviceCode":null},{"subscriptionTier":"DELETE","startDate":null,"transactionId":"33333333333333333333","paymentType":null,"expiryDate":null,"userId":"333333333333333333333333","countryCode":"CN","serviceCode":null}]}接口调用：
package com.ultimate.ws.api;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.log4j.Logger;
import net.sf.json.JSONArray;
import net.sf.json.JSONNull;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.processors.DefaultValueProcessor;
import org.junit.Test;
import com.ultimate.ws.api.Subscriptionevent;
import com.ultimate.ws.util.HttpClientUtil.UTF8PostMethod;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileInputStream;
import java.io.InputStream;
public class SubscriptionEventTest {
private static Logger logger = Logger
.getLogger(SubscriptionEventTest.class);
@Test
public void sendEvent() {
//从文件读取数据
File file = new File("/xxx/test.json");
String contents = "";
JsonConfig jsonConfig= new JsonConfig();
//在把字符串转为json对象时，设置字符串值如果为null时就是null，不要默认转成""
jsonConfig.registerDefaultValueProcessor(String.class,
new DefaultValueProcessor(){
public Object getDefaultValue(Class type){
return JSONNull.getInstance();
}
});
try {
//读取文件--流数据---读入字节数组---转为字符串
InputStream in = new FileInputStream(file);
int len = (int) file.length();
byte[] buffer = new byte[len];
in.read(buffer, 0, len);
contents = new String(buffer);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//此处测试数据为数组格式，使用JSONArray
JSONArray arr = JSONArray.fromObject(contents);
List<Subscriptionevent> list = new ArrayList<Subscriptionevent>();
String url = "/xxx/posturl";
for (int i = 0; i < arr.size(); i++) {
//逐个获取每个对象
Object a00 = arr.get(i);
JSONObject a0=JSONObject.fromObject(a00);
Subscriptionevent a=(Subscriptionevent) JSONObject.toBean(a0, Subscriptionevent.class);
list.add(a);
}
if (list.size() > 0) {
//json对象---字符串的转换，这里
JSONArray b = JSONArray.fromObject(list,jsonConfig);
//JsonConfig config = new JsonConfig();
//config.registerJsonValueProcessor(Timestamp.class, new JsonDateValueProcessor());
//String[] EXCLUDES = new String[]{"createDate","createUser","modifyDate","modifyUser","resultCode","resultMsg","id"};
// config.setExcludes(EXCLUDES); //可设置排除某些字段
生成的对象是和原来的文件里的内容一样，这里遍历可以对其做些修改，我原始初衷，做这层遍历是因为接口处理中使用的json处理类不支持一次性调用时数组对象的内容过大，似乎是对大小做了限制，一旦超过设定的大小就自动截断，导致解析时格式异常。这里为了展示net.sf.json的使用把中间的将原始list拆分成多个发送的逻辑给去掉了。
//这里是要在原json的外面再包裹一个key，最简单的方式就是下面这样的字符串拼接，另一种方式就是创建一个java pojo对象，里面只包含一个类型为list的元素
String ss ="{subscriptionEvents:"+ b.toString()+"}";
//简单的调用接口，可以使用firefox的插件RestClient,或者使用下面这样的用程序接口调用的方式
HttpClient httpClient = new HttpClient();
UTF8PostMethod postMethod = new UTF8PostMethod(url);
byte[] b2 = null;
try {
b2 = ss.getBytes("utf-8");
InputStream inputStream = new ByteArrayInputStream(b2, 0,
b2.length);
RequestEntity requestEntity = new InputStreamRequestEntity(
inputStream, b2.length);
postMethod.setRequestEntity(requestEntity);
httpClient.executeMethod(postMethod);
String response = postMethod.getResponseBodyAsString();
postMethod.releaseConnection();
if(!response.contains("success")){
System.out.println("lsx error:" +ss);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
总结：
使用此net.sf.json操作时遇到的问题：
所需jar包
1、 commons-beanutils-1.8.0.jar不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
2、commons-collections-3.1.jar 不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap
3、commons-lang-2.5.jar不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
4、commons-logging-1.2.jar不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
5、ezmorph-1.0.6.jar不加这个包
java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher
6、json-lib-2.4-jdk15.jar不加这个包
java.lang.NoClassDefFoundError: net/sf/json/JSONObject
2 在做转换时net.sf.json.JsonConfig对象，用于设置一些字段，日期，空 等格式等
参考博客在： https://www.cnblogs.com/handsomeye/p/5107398.html
3 日期格式Date默认如果不做任何设置的话，再转化为时会成为：{"date":6,"day":3,"hours":21,"minutes":26,"month":0,"nanos":290000000,"seconds":31,"time":1452086791290,"timezoneOffset":-480,"year":116}
所以在处理日期类型的数据时，可以简单的用字符串格式接收，不必再转换了，存数据库时，数据库也是可以自动实现转换的
4 net.sf.json.JSONObject对象使用指南 https://blog.csdn.net/lk142500/article/details/82499387
5 在json字符串中，key可以有引号，也可以不带引号都是对的
{"address":"北京市西城区","age":"23","name":"JSON"} {address:"北京市西城区",age:"23",name:"JSON"}