fastjson的使用
jopen
9年前
一、项目结构
一个学生类，其中学生类中可以包含Course类对象
二、数据对象转化为Json字符串
GenerateJson.java代码标识转化为json字符串
（1）将学生对象转化为json，其中学生中包含Course对象
@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）将一个单独的实体对象转化为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）将包含多个类似于（1）中的实体对象转化为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" } ]三、解析json数据到实体对象
（1）解析上述（1）中学生中包含Course的对象
[{"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）由于只有一个对象，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）将上述中的（3）当有多个上述的对象的时候，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()); }