1.使用Google 的 gson方式解析json,园子里面对json方面的教程都非常多,很多写的都非常不错,借鉴不少,毕竟刚刚研究.
gson支持解析的类型还是比较全面的,包括JavaBean,List<JavaBean>,List<String>,Map等,使用起来也是比较方便.
首先配置环境,需要下载相应的jar包, 下面测试使用的版本是2.2.4.
官方下载地址:http://code.google.com/p/google-gson/
gson API:http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html
测试用例(源码附件GsonJson.zip,下载地址:http://pan.baidu.com/s/1qWHNjdU):
public class MyGson {
private Gson gson = new Gson();
//java bean to json string
@Test
public void beanToJson(){
Person person = new Person();
person.setId(1);
person.setName("zhanglu");
person.setAddress("湖北大悟");
System.out.println(gson.toJson(person));
}
//json string to java bean
@Test
public void jsonTobean(){
String json = "{‘id‘:‘1‘,‘name‘:‘zhang‘,‘address‘:‘Hubei‘}";
Person person = gson.fromJson(json, Person.class);
System.out.println(person);
}
//list<bean> to json
@Test
public void listBeanToJson(){
Person person1 = new Person(1, "zhang", "Hubei");
Person person2 = new Person(2,"lu","DaWu");
List<Person> persons = new ArrayList<>();
persons.add(person1);
persons.add(person2);
String json = gson.toJson(persons);
System.out.println(json);
}
//json to list<bean>
@Test
public void jsonToListBean(){
String json = "[{‘id‘:‘1‘,‘name‘:‘zhang‘,‘address‘:‘Hubei‘},{‘id‘:‘2‘,‘name‘:‘lu‘,‘address‘:‘DaWu‘}]";
List<Person> persons = gson.fromJson(json, new TypeToken<List<Person>>(){}.getType());
for(Person per : persons){
System.out.println(per);
}
}
//list string to string
@Test
public void listStringToJson(){
List<String> list = new ArrayList<>();
list.add("zhanglu");
list.add("hubei");
list.add("Dawu");
String json = gson.toJson(list);
System.out.println(json);
}
//json string to list<string>
@Test
public void jsonToListString(){
String json = "[‘zhanglu‘,‘hubei‘,‘Dawu‘]";
List<String> list = gson.fromJson(json, new TypeToken<List<String>>(){}.getType());
for(String str : list){
System.out.println(str);
}
}
//Map<String,object> to json
@Test
public void mapToJson(){
Map<String, Person> map = new HashMap<>();
Person person = new Person(1, "zhanglu", "湖北大悟");
Person person2 = new Person(2, "Alone", "HuBeiDaWu");
map.put("person", person);
map.put("person2", person2);
String json = gson.toJson(map);
System.out.println(json);
}
//json to Map<Stirng,Object>
@Test
public void jsonToMap(){
String json = "{‘person‘:{‘id‘:1,‘name‘:‘zhanglu‘,‘address‘:‘湖北大悟‘},‘person2‘:{‘id‘:2,‘name‘:‘Alone‘,‘address‘:‘HuBeiDaWu‘}}";
Map<String, Person> map = gson.fromJson(json, new TypeToken<Map<String,Person>>(){}.getType());
for(String str : map.keySet()){
System.out.println("key:"+str);
System.out.println((Person)map.get(str));
}
}
//test refrences obj
//如果双向引用, 会产生死循环, 方法1, 在需要被过滤的字段上加上修饰符transient, Cat的animail加上了
//方法1：排除transient字段
/*//方法2：排除Modifier为指定类型的字段Gson gson = new GsonBuilder().excludeFieldsWithModifiers(Modifier.PROTECTED) // <---.create();*/
//方法3：使用@Expose注解,注意，没有被 @Expose 标注的字段会被排除，如下所示：
@Test
public void testReferences(){
Animail animail = new Animail();
animail.setName("Animial");
Cat cat = new Cat();
cat.setId(1);
cat.setName("Cat1");
cat.setAnimail(animail);
Cat cat2 = new Cat();
cat2.setId(2);
cat2.setName("Cat2");
cat.setAnimail(animail);
List<Cat> cats = new ArrayList<>();
cats.add(cat2);
cats.add(cat);
animail.setCatlist(cats);
String json = gson.toJson(animail);
System.out.println(json);
}
//方法4：使用ExclusionStrategy定制字段排除策略,这种方式最灵活，下面的例子把所有以下划线开头的字段全部都排除掉：
@Test
public void ExclusionStrategy(){
ClassInfo classInfo = new ClassInfo();
classInfo.setClassNo("C0001");
classInfo.setClassName("Java_1");
StudentInfo stu1 = new StudentInfo();
stu1.setStuId(1);
stu1.setStuName(1);
StudentInfo stu2 = new StudentInfo();
stu2.setStuId(1);
stu2.setStuName(1);
stu1.setClassInfo(classInfo);
stu2.setClassInfo(classInfo);
List<StudentInfo> stulist = new ArrayList<>();
stulist.add(stu2);
stulist.add(stu1);
classInfo.setStudentslist(stulist);
ExclusionStrategy myExclusionStrategy = new ExclusionStrategy() {
@Override
public boolean shouldSkipField(FieldAttributes fa) {
return fa.getName().equals("classInfo");
}
@Override
public boolean shouldSkipClass(Class<?> clazz) {
return false;
}
};
Gson gson = new GsonBuilder().setExclusionStrategies(myExclusionStrategy).create();
String json = gson.toJson(classInfo);
System.out.println(json);
}
}
2.使用阿里的fastJson方式解析json,阿里官方介绍说这个比gson效率更高速度更快,使用fastJson的人也非常多,至少我有些同学公司里面在使用, 不乏游戏开发在使用,也有人说有Bug,具体我也没有对两者进行比较测试.
fastJson同样支持常用的数据类型解析,还提供了大文本解析和对时间类型的解析方式,同样也有android版本jar, 但是这个不是C#的FastJson, 首字母大小写是不一样的, 也不是同一个东西, 不可混为一谈.
官网文档::https://github.com/alibaba/fastjson/wiki/常见问题
笔者测试使用的版本是1.1.41,下载地址:http://repo1.maven.org/maven2/com/alibaba/fastjson/1.1.41/
fastJson其它版本官方下载地址:http://repo1.maven.org/maven2/com/alibaba/fastjson/
maven配置:
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
测试用例(源码附件fastJson.zip,下载地址:http://pan.baidu.com/s/1pJE1xsZ):
public class FastJsonTest {
// Java bean to json
@Test
public void JavaBeanToJson() {
Person person = new Person(1, "zhanglu", "Hubei");
String json = JSON.toJSONString(person);
System.out.println(json);
}
// Json to Javabean
@Test
public void JsonToJavaBean() {
String json = "{‘address‘:‘Hubei‘,‘id‘:1,‘name‘:‘zhanglu‘}";
Person person = JSON.parseObject(json, Person.class);
System.out.println(person);
}
// List<JavaBean> to json
@Test
public void listJavaBeanToJson() {
Person p1 = new Person(1, "zhanglu", "Hubei");
Person p2 = new Person(2, "wukang", "Hubei");
List<Person> personlist = new ArrayList<>();
personlist.add(p1);
personlist.add(p2);
String json = JSON.toJSONString(personlist);
System.out.println(json);
}
// Json to List<JavaBean>
@Test
public void JsonToListBean() {
String json = "[{‘address‘:‘Hubei‘,‘id‘:1,‘name‘:‘zhanglu‘},{‘address‘:‘Hubei‘,‘id‘:2,‘name‘:‘wukang‘}]";
List<Person> persons = JSON.parseArray(json, Person.class);
for (Person person : persons) {
System.out.println(person);
}
}
// List<String> to json
@Test
public void listStringToJson() {
List<String> list = new ArrayList<>();
list.add("zhanglu");
list.add("wukang");
String json = JSON.toJSONString(list);
System.out.println(json);
}
// json to List<String>
@Test
public void JsonToListString() {
String json = "[‘zhanglu‘,‘wukang‘]";
List<String> list = JSON.parseArray(json, String.class);
for (String str : list) {
System.out.println(str);
}
}
// Map<String,Object> to json
@Test
public void MapToJson() {
Map<String, Person> map = new HashMap<>();
map.put("person1", new Person(1, "zhanglu", "Hubei"));
map.put("person2", new Person(2, "wukang", "Hubei"));
String json = JSON.toJSONString(map);
System.out.println(json);
}
// Json to Map<String,JavaBean>
@Test
public void JsonToMap() {
String json = "{‘person1‘:{‘address‘:‘Hubei‘,‘id‘:1,‘name‘:‘zhanglu‘},‘person2‘:{‘address‘:‘Hubei‘,‘id‘:2,‘name‘:‘wukang‘}}";
Map<String, Person> map = JSON.parseObject(json,
new TypeReference<Map<String, Person>>() {
});
for (String key : map.keySet()) {
System.out.println("key:" + key);
System.out.println(map.get(key));
}
}
// Test references javaBean
// Animail,Cat
@Test
public void TestReferences() {
Animail animail = new Animail();
animail.setName("animial");
Cat cat = new Cat();
cat.setId(1);
cat.setName("MiMi");
Cat cat2 = new Cat();
cat2.setId(1);
cat2.setName("CiCi");
cat.setAnimail(animail);
cat2.setAnimail(animail);
List<Cat> catlist = new ArrayList<>();
catlist.add(cat2);
catlist.add(cat);
animail.setCatlist(catlist);
String json = JSON.toJSONString(animail);
System.out.println(json);
}
// Test references javaBean
// Animail,Cat
@Test
public void TestReferences2() {
Animail animail = new Animail();
animail.setName("animial");
Cat cat = new Cat();
cat.setId(1);
cat.setName("MiMi");
Cat cat2 = new Cat();
cat2.setId(1);
cat2.setName("CiCi");
cat.setAnimail(animail);
cat2.setAnimail(animail);
List<Cat> catlist = new ArrayList<>();
catlist.add(cat2);
catlist.add(cat);
animail.setCatlist(catlist);
String json = JSON.toJSONString(animail,SerializerFeature.DisableCircularReferenceDetect);
System.out.println(json);
}
// methods 01 transient
// @JSONField(serialize=false)
// Date to Json
@Test
public void DateToJson(){
StudentInfo studentInfo = new StudentInfo();
studentInfo.setBirthday(new Date());
studentInfo.setId(1);
JSON.DEFFAULT_DATE_FORMAT = "yyyy-MM-dd";
String json = JSON.toJSONString(studentInfo,SerializerFeature.WriteDateUseDateFormat);
System.out.println(json);
}
}
时间： 2024-08-08 13:45:08