Spring json和 Map, List等bean的转换

Spring  json和 Map, List等bean的转换，代码如下：

1： 将map集合转换成json字符串和将json字符串转换成map

1. [代码][Java]代码 

Map map = newHashMap();
map.put("method","json");
map.put("param",null);
map.put("time","2015-01-23 10:54:55");
ObjectMapper mapper = newObjectMapper();
mapper.writeValueAsString(map);

2. [代码][Java]代码    

 

publicstaticvoidreadJson2Map(String json) {
        ObjectMapper objectMapper = newObjectMapper();
        try{
 
            //将json字符串转成map结合解析出来，并打印(这里以解析成map为例)
            Map> maps = objectMapper.readValue(
                    json, Map.class);
            System.out.println(maps.size());
            Set key = maps.keySet();
            Iterator iter = key.iterator();
            while(iter.hasNext()) {
                String field = iter.next();
                System.out.println(field + ":"+ maps.get(field));
            }
        }catch(JsonParseException e) {
            e.printStackTrace();
        }catch(JsonMappingException e) {
            e.printStackTrace();
        }catch(IOException e) {
            e.printStackTrace();
        }
    }
readJson2Map(json);

public class Jackson {  
    /* 
     * 
     * Class Descripton goes here. 
     * 
     * @class Jackson 
     * @version  1.0 
     */  
    public  static JsonGenerator jsonGenerator = null;  
    private static ObjectMapper mapper = new ObjectMapper();  
    public static void main(String[] args) {  
        Student student = new Student();  
        student.setIsstudent(true);  
        student.setUid(1000);  
        student.setUname("xiao liao");  
        student.setUpwd("123");  
        student.setNumber(12);  
          
        Map stuMap = new HashMap();  
        stuMap.put("1", student);  
        stuMap.put("2", student);  
          
        List