阿里巴巴fastjson的使用

阿里巴巴fastjson的使用

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

@Testpublic 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

@Testpublic 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

@Testpublic 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"}]

@Testpublic 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：

@Testpublic 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：

@Testpublic 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应用案例之FastJson http://www.linuxidc.com/Linux/2015-03/115366.htmFastJson库省略小数点后0的Bug的跟踪 http://www.linuxidc.com/Linux/2015-06/118522.htmfastjson 的详细介绍：请点这里
fastjson 的下载地址：请点这里本文永久更新链接地址：http://www.linuxidc.com/Linux/2015-07/120012.htm