请问怎样将有java.sql.Date属性的Bean转换成json字符串，再把json字符串转换回Bean请大侠指教！！！ 怎样从java后台获取json字符串并转换为json对象输出
\u5e26\u6709\u5bf9\u8c61\u5c5e\u6027\u7684bean\uff0c\u5982\u4f55\u8f6c\u6362\u6210json\u5bf9\u8c61\u6216\u8005\u5b57\u7b26\u4e32fastjson\u8f6c\u5316\u5982\u4e0b\uff1a
public class Userinfo {
private String username;
private String password;
private Address address\uff1b
//\u7701\u7565\u76f8\u5e94\u7684get/set\u65b9\u6cd5
}
//json\u8f6c\u5316\u5355\u4e2a\u5bf9\u8c61
Userinfo userinfo = JSON.parseObject(jsonString, Userinfo.class);
//json\u8f6c\u5316\u4e3a\u591a\u4e2a\u5bf9\u8c61
List list = JSON.parseArray(jsonString, Userinfo.class);
\u5bf9\u8c61\u8f6c\u5316\u4e3aJSON
JSON json = JSON.toJSON(userinfo);
\u5728model\u5c42
public List> query() throws SQLException
{
List> listmap=new ArrayList>();
Connection conn=null;
ResultSet rs=null;
String query="SELECT * FROM COURSE";
Statement st=null;
conn=Conn.getConnection();
st=conn.createStatement();
rs=st.executeQuery(query);
while(rs.next())
{
Map map=new HashMap();
map.put("coursetypeid", rs.getString("COURSE_TYPE_ID"));
map.put("coursename", rs.getString("COURSE_NAME"));
map.put("publish", rs.getString("PUBLISH"));
map.put("publishtime", rs.getString("PUBLISH_TIME"));
map.put("coursenumber", rs.getString("CHAPTER_NUMBER"));
map.put("courseid", rs.getString("COURSE_ID"));
map.put("coursedesc", rs.getString("COURSE_DESC"));
listmap.add(map);
}
conn.close();
return listmap;
}
\u63a7\u5236\u5c42
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
ConImp c=new ConImp();
String json= c.QueryCourseInfo();
response.getWriter().write(json);
}
\u6700\u540e\u5728\u9875\u9762\u901a\u8fc7\u8f6c\u6362\u83b7\u5f97\u5e76\u663e\u793a\u3002
http://json-lib.sourceforge.net/usage.html
From Beans to JSON：
class MyBean{
private String name = "json";
private int pojoId = 1;
private char[] options = new char[]{'a','f'};
private String func1 = "function(i){ return this.options[i]; }";
private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");
// getters & setters
...
}
JSONObject jsonObject = JSONObject.fromObject( new MyBean() );
System.out.println( jsonObject );
/* prints
{"name":"json","pojoId":1,"options":["a","f"],
"func1":function(i){ return this.options[i];},
"func2":function(i){ return this.options[i];}}
*/
在你这里就是：JSONObject jsonObject = JSONObject.fromObject(user );
From JSON to Beans：
String json = "{bool:true,integer:1,string:\"json\"}";
JSONObject jsonObject = JSONObject.fromObject( json );
BeanA bean = (BeanA) JSONObject.toBean( jsonObject, BeanA.class );
在你这里就是：
JSONObject jsonObject = JSONObject.fromObject( json );
User bean = (User) JSONObject.toBean( jsonObject, User.class );
如果是我，我就会把birthday的类型设置为String类型，并且限定为“yyyy-MM-dd”的形式，然后写个工具方法将字符串与日期进行互解析。
JSON擅长的本来就是字符串，不如投其所好，与其实现他的接口，不如自己实现工具方法，简单快捷。
void setBirthday(String birth){
this.birthday = functionName(birth);
}
String getBirthday(){
return birthday;
}
String functionName(Date date){
return "yyyy-MM-dd";
}
Date funcitonName(String yMd){
return date;
}
json有一个工具叫做Json-lib，提供相应的转换操作。可以从google一下这个工具，挺好用的。
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