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());      }