fastjson List String JSONArray 转换

朴灿烈づ我的快乐病毒、 2022-01-21 10:25 324阅读 0赞

## 三种转换方法 ##

String courseData = "...";
    List<Course> courseTable;
    courseTable = JSON.parseObject(courseData, new TypeReference<List<Course>>() {});
    courseTable = JSON.parseArray(courseData, Course.class);
    courseTable = JSON.parseArray(courseData).toJavaList(Course.class);
    System.out.println(courseTable);

其中，第三种方法：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXVqaW4xOTk3_size_22_color_222222_t_70]

## Code ##

// List
    List<Course>  courseTable = new LinkedList<>();
    courseTable.add(new Course("1", "Java", 30, 3.0));
    courseTable.add(new Course("2", "JavaScript", 25, 2.5));
    System.out.println(courseTable);
    
    // List -> String
    String str = JSON.toJSONString(courseTable);
    System.out.println(str);
    
    // String -> JSONArray
    JSONArray objects = JSON.parseArray(str);
    System.out.println(objects);
    
    // JSONArray -> List
    List<Course> courses = objects.toJavaList(Course.class);
    System.out.println(courses);

输出

[{"course":"Java","credit":3.0,"id":"1","number":30}, {"course":"JavaScript","credit":2.5,"id":"2","number":25}]
    [{"course":"Java","credit":3.0,"id":"1","number":30},{"course":"JavaScript","credit":2.5,"id":"2","number":25}]
    [{"number":30,"course":"Java","id":"1","credit":3.0},{"number":25,"course":"JavaScript","id":"2","credit":2.5}]
    [{"course":"Java","credit":3.0,"id":"1","number":30}, {"course":"JavaScript","credit":2.5,"id":"2","number":25}]

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