javabean:Address
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package com.baebae.model;
public class Address
{
private String city;
private String district;
private String street;
private int no;
getter/setter()...
}
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JAVA--JSON互相转换：
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【1】JAVA――>JSON
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/**
* <1> JAVA-->JSON
* 单个对象Object-->JSONObject
* 集合List/Array/Set----->JSONArray
*/
@Test
public void testObj2JSON() throws InterruptedException {
// 1.bean---->json
Address addr = new Address();
addr.setCity("北京");
addr.setDistrict("清河");
addr.setStreet("安宁庄东路");
addr.setNo(200);
JSONObject jsonObj = JSONObject.fromObject(addr);
System.err.println("____________jsonObj_______________");
System.out.println(jsonObj);
// 1.集合-->JSONArray
Set<Address> set = new HashSet<Address>();
Address[] addrArray = new Address[100];
List<Address> list = new ArrayList<Address>();
for(int i=0;i<10;i++){
Address address = new Address();
address.setCity("北京");
address.setDistrict("清河");
address.setStreet("安宁庄东路"+i+"号");
address.setNo(200+i);
list.add(address);
addrArray[i]=address;
set.add(address);
}
// 这里不能用JSONObject.fromObject(collection)
JSONArray jsonList = JSONArray.fromObject(list);
JSONArray jsonArray = JSONArray.fromObject(addrArray);
JSONArray jsonSet = JSONArray.fromObject(set);
// 打印结果
Thread.sleep(3000);
System.err.println("____________jsonList_______________");
System.out.println(jsonList);
Thread.sleep(3000);
System.err.println("_____________jsonArray______________");
System.out.println(jsonArray);
Thread.sleep(3000);
System.err.println("______________jsonSet_____________");
System.out.println(jsonSet);
Thread.sleep(3000);
}
打印结果：
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____________jsonObj_______________
{"city":"北京","district":"清河","no":200,"street":"安宁庄东路"}
____________jsonList_______________
[{"city":"北京","district":"清河","no":200,"street":"安宁庄东路0号"},{"city":"北京","district":"清河","no":201,"street":"安宁庄东路1号"},{"city":"北京","district":"清河","no":202,"street":"安宁庄东路2号"},{"city":"北京","district":"清河","no":203,"street":"安宁庄东路3号"},{"city":"北京","district":"清河","no":204,"street":"安宁庄东路4号"},{"city":"北京","district":"清河","no":205,"street":"安宁庄东路5号"},{"city":"北京","district":"清河","no":206,"street":"安宁庄东路6号"},{"city":"北京","district":"清河","no":207,"street":"安宁庄东路7号"},{"city":"北京","district":"清河","no":208,"street":"安宁庄东路8号"},{"city":"北京","district":"清河","no":209,"street":"安宁庄东路9号"}]
_____________jsonArray______________
[{"city":"北京","district":"清河","no":200,"street":"安宁庄东路0号"},{"city":"北京","district":"清河","no":201,"street":"安宁庄东路1号"},{"city":"北京","district":"清河","no":202,"street":"安宁庄东路2号"},{"city":"北京","district":"清河","no":203,"street":"安宁庄东路3号"},{"city":"北京","district":"清河","no":204,"street":"安宁庄东路4号"},{"city":"北京","district":"清河","no":205,"street":"安宁庄东路5号"},{"city":"北京","district":"清河","no":206,"street":"安宁庄东路6号"},{"city":"北京","district":"清河","no":207,"street":"安宁庄东路7号"},{"city":"北京","district":"清河","no":208,"street":"安宁庄东路8号"},{"city":"北京","district":"清河","no":209,"street":"安宁庄东路9号"},null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null]
______________jsonSet_____________
[{"city":"北京","district":"清河","no":207,"street":"安宁庄东路7号"},{"city":"北京","district":"清河","no":202,"street":"安宁庄东路2号"},{"city":"北京","district":"清河","no":200,"street":"安宁庄东路0号"},{"city":"北京","district":"清河","no":204,"street":"安宁庄东路4号"},{"city":"北京","district":"清河","no":205,"street":"安宁庄东路5号"},{"city":"北京","district":"清河","no":208,"street":"安宁庄东路8号"},{"city":"北京","district":"清河","no":209,"street":"安宁庄东路9号"},{"city":"北京","district":"清河","no":203,"street":"安宁庄东路3号"},{"city":"北京","district":"清河","no":206,"street":"安宁庄东路6号"},{"city":"北京","district":"清河","no":201,"street":"安宁庄东路1号"}]
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【2】JSON---->JAVA
/**
* <2> JSON-->JAVA
* 1.如果字段名有错无法匹配，会发出警告；属性得到是null.
* 2.转换：
* ->Object
* <1> 字符串封装成JSON 对象：【JSONObject.fromObject(jsonStr)】
* <2> JSON对象转换成Object:【(Address) JSONObject.toBean(jsonObject, Address.class)】
* ->Collection
* <1> 字符串封装成JSONArray 对象：【JSONArray.fromObject(jsonArrayStr)】
* <2> JSONArray对象转换成Java集合:【(List<Address>)JSONArray.toCollection(jsonArray, Address.class)】
*/
@Test
public void testJson2Java() throws InterruptedException {
// 1.JSON object
String jsonStr = "{\"city\":\"北京\",\"district\":\"清河\",\"street\":\"安宁庄东路南口\",\"no\":500}";
// 3.JSONArray
String jsonArrayStr = "[{\"city\":\"北京\",\"district\":\"清河\",\"street\":\"安宁庄东路南口\",\"no\":500},{\"city\":\"北京\",\"district\":\"上地\",\"street\":\"安宁庄东路\",\"no\":300}]";
JSONObject jsonObject = JSONObject.fromObject(jsonStr);
JSONArray jsonArray = JSONArray.fromObject(jsonArrayStr);
// JSONObject.toBean(jasonObject,Class): Bean;
Address address = (Address) JSONObject.toBean(jsonObject, Address.class);
List<Address> list = (List<Address>)JSONArray.toCollection(jsonArray, Address.class);
// 1.输出Object
Thread.sleep(1000);
System.out.println("District:"+address.getDistrict());
// 2.输出Array
Thread.sleep(1000);
for(Address addr:list){
System.out.println(addr.getCity()+"\t"+addr.getDistrict()+"\t"+addr.getStreet()+"\t"+addr.getNo());
}
}
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打印结果：
District:清河 北京 清河 安宁庄东路南口 500 北京 上地 安宁庄东路 300
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【总结】：
JSON――――>JAVA:
? ? ? ??->Object ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ??<1> 字符串封装成JSON 对象：【JSONObject.fromObject(jsonStr)】 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ??<2> JSON对象转换成Object:【(Address) JSONObject.toBean(jsonObject, Address.class)】 ? ? ? ? ? ? ?
? ? ? ??->Collection ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ??<1> 字符串封装成JSONArray 对象：【JSONArray.fromObject(jsonArrayStr)】 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??
? ??<2> JSONArray对象转换成Java集合:【(List<Address>)JSONArray.toCollection(jsonArray, Address.class)】
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JAVA――――>JSON:
? ? ? ??Object：【JSONObject.fromObject(addr)】
? ? ? Collection：【JSONArray.fromObject(list)】
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参考资料：
1.官方网站：http://sourceforge.net/projects/json-lib
2.所需jar包：
commons-beanutils-1.8.3.jar commons-collections-3.2.1.jar commons-lang-2.5.jar commons-logging-1.1.1.jar ezmorph-1.0.6.jar json-lib-2.4-jdk15.jar
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