来源:
http://www.blogjava.net/jlins-you/archive/2012/06/22/381292.html
json除了可以用于前台传递,还可用于后台之间传递。它可以传递List,Map,Bean等类型的数据。
例如: User u1=new User();
u1.setUsername("zy");
u1.setPassword("123");
User
u2=new
User();
u2.setUsername("msl");
u2.setPassword("456");
List list =
new ArrayList(); //把两个对象放进list中
list.add(u1);
list.add(u2);
JSONArray jsonArray = JSONArray.fromObject( list ); //把list放进json数组
Map map = new HashMap();
map.put("message", "111");
map.put("users", jsonArray); //把json数组做为一个值放进Map中
JSONObject jsonObject =
JSONObject.fromObject(map); //把map放进json对象中
PrintWriter out =
response.getWriter();
out.print(jsonObject); //
传递json
传递的json格式为:
{"message":"111","users":[{"password":"123","username":"zy"},{"password":"456","username":"msl"}]}
在接收端的java文件中取:
returnJson是从输入流中得到的json格式的字符串。输出为:
{"message":"111","users":[{"password":"123","username":"zy"},
{"password":"456","username":"msl"}]}
if(returnJson !=null&& returnJson !=""){
String
strJson = returnJson.replace("?(", "").replace(")", "").replace(";",
"");
if(strJson.startsWith("{")){
JSONObject
jsonObject = JSONObject.fromObject(strJson);
JSONArray jsonArray =
JSONArray.fromObject(jsonObject.get("users"));
for (int i =
0, len = jsonArray.size(); i < len; i++) {
JSONObject jsonUser =
jsonArray.getJSONObject(i);
User vo = (User)JSONObject.toBean(jsonUser,
User.class);
System.out.println(vo.getUsername()+":"+vo.getPassword());
}
}
}
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