一個學生類,其中學生類中可以包含Course類對象
GenerateJson.java代碼標識轉化為json字符串
(1)將學生對象轉化為json,其中學生中包含Course對象
@Test
public void testSimpleJSON(){
Student stu = new Student("xuliugen", "nan", "123123", "100");
Course course = new Course("JAVA", "xiaobin", "100");
stu.setCourse(course);
String json = JSON.toJSONString(stu);
System.out.println(json);
}
{
"course":{
"coursename":"JAVA",
"coursescore":"100",
"courseteacher":"xiaobin"
},
"password":"123123",
"score":"100",
"sex":"nan",
"username":"xuliugen"
}
(2)將一個單獨的實體對象轉化為json
@Test
public void testListJSON(){
JSONTest jt1 = new JSONTest("xuliugen", "nan");
JSONTest jt2 = new JSONTest("xieyan", "nv");
List<JSONTest> li = new ArrayList<JSONTest>();
li.add(jt1);
li.add(jt2);
String jsonstr = JSON.toJSONString(li);
System.out.println(jsonstr);
}
[{"name":"xuliugen","sex":"nan"},{"name":"xieyan","sex":"nv"}]
(3)將包含多個類似於(1)中的實體對象轉化為json
@Test
public void testMulJSON(){
Student stu = new Student("xuliugen", "nan", "123123", "100");
Course course = new Course("JAVA", "xiaobin", "100");
stu.setCourse(course);
Student stu2 = new Student("xieyan", "nan", "123123", "100");
Course course2 = new Course("music", "qwe", "100");
stu2.setCourse(course2);
List<Student> stuList = new ArrayList<Student>();
stuList.add(stu);
stuList.add(stu2);
String json2 = JSON.toJSONString(stuList);
System.out.println(json2);
}
[
{
"course":{
"coursename":"JAVA",
"coursescore":"100",
"courseteacher":"xiaobin"
},
"password":"123123",
"score":"100",
"sex":"nan",
"username":"xuliugen"
},
{
"course":{
"coursename":"music",
"coursescore":"100",
"courseteacher":"qwe"
},
"password":"123123",
"score":"100",
"sex":"nan",
"username":"xieyan"
}
]
(1)解析上述(1)中學生中包含Course的對象
[{"name":"xuliugen","sex":"nan"},{"name":"xieyan","sex":"nv"}]
@Test
public void testParseSimpleJSON(){
String json = "[{\"name\":\"xuliugen\",\"sex\":\"nan\"},{\"name\":\"xieyan\",\"sex\":\"nv\"}]";
JSONArray jsonArray = JSON.parseArray(json);
String str = jsonArray.getString(0);
JSONTest jsonTest = JSON.parseObject(str,JSONTest.class);
System.out.println(jsonTest.getSex());
}
{
"course":{
"coursename":"JAVA",
"coursescore":"100",
"courseteacher":"xiaobin"
},
"password":"123123",
"score":"100",
"sex":"nan",
"username":"xuliugen"
}
(2)由於只有一個對象,解析如下:
@Test
public void testParseStudentIncludeCourseJSON() {
String json = "{\"course\":{\"coursename\":\"JAVA\",\"coursescore\":\"100\",\"courseteacher\":\"xiaobin\"},\"password\":\"123123\",\"score\":\"100\",\"sex\":\"nan\",\"username\":\"xuliugen\"}";
Student stu = JSON.parseObject(json,Student.class);
System.out.println(stu.getPassword());
}
(3)將上述中的(3)當有多個上述的對象的時候,解析如下:
[
{
"course":{
"coursename":"JAVA",
"coursescore":"100",
"courseteacher":"xiaobin"
},
"password":"123123",
"score":"100",
"sex":"nan",
"username":"xuliugen"
},
{
"course":{
"coursename":"music",
"coursescore":"100",
"courseteacher":"qwe"
},
"password":"123123",
"score":"100",
"sex":"nan",
"username":"xieyan"
}
]
解析如下:
@Test
public void testParseListStudentIncludeCourseJSON() {
String json = "[{\"course\":{\"coursename\":\"JAVA\",\"coursescore\":\"100\",\"courseteacher\":\"xiaobin\"},\"password\":\"123123\",\"score\":\"100\",\"sex\":\"nan\",\"username\":\"xuliugen123\"},{\"course\":{\"coursename\":\"music\",\"coursescore\":\"100\",\"courseteacher\":\"qwe\"},\"password\":\"123123\",\"score\":\"100\",\"sex\":\"nan\",\"username\":\"xieyan\"}]";
JSONArray jsonArray = JSON.parseArray(json);
String str = jsonArray.getString(0);
Student stu = JSON.parseObject(str, Student.class);
System.out.println(stu.getUsername());
}
Json應用案例之FastJson http://www.linuxidc.com/Linux/2015-03/115366.htm
FastJson庫省略小數點後0的Bug的跟蹤 http://www.linuxidc.com/Linux/2015-06/118522.htm
fastjson 的詳細介紹:請點這裡
fastjson 的下載地址:請點這裡