一、JSON语法：
1.数组：[1,2,3]；//数组里面可以放对象；
2.对象：{"key"：value，"key"：value}；//对象里面可以放数组；
二、fastjson解析：
1.导包：fastjson.jar；
2.解析：
（1）序列化：String toJSONString(Object object)；
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
User user = new User();
user.setName("zs");
user.setAge(12);
String userStr = JSON.toJSONString(user);
resp.getWriter().print(userStr);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}
}
（2）反序列化：
1.普通对象：
1）class<?> JSON.parseObject(String, class<?>.class);
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userStr = "{\"name\":\"zs\",\"age\":13}";
User user = JSON.parseObject(userStr, User.class);
System.out.println(user);
}
}
2）List<Object> JSON.parseArray(String, Object.class)
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String usersStr = "[{\"name\":\"zs\",\"age\":12},{\"name\":\"ls\",\"age\":16}]";
List<User> users = JSON.parseArray(usersStr, User.class);
for (Iterator<User> iterator = users.iterator(); iterator.hasNext(); ) {
User user = iterator.next();
System.out.println(user);
}
}
}
2.Lsit，set集合：
1）将json转换成List：
List list = JSON.parseObject(json,new TypeReference<ARRAYLIST>(){});
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String usersStr = "[{\"name\":\"zs\",\"age\":12},{\"name\":\"ls\",\"age\":16}]";
List<User> users = JSON.parseObject(usersStr, new TypeReference<List<User>>() {});
for (Iterator<User> iterator = users.iterator(); iterator.hasNext(); ) {
User user = iterator.next();
System.out.println(user);
}
}
}
2）将json转换成Set：
Set set = JSON.parseObject(json,new TypeReference<HASHSET>(){});
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String usersStr = "[{\"name\":\"zs\",\"age\":12},{\"name\":\"ls\",\"age\":16}]";
Set<User> users = JSON.parseObject(usersStr, new TypeReference<Set<User>>() {});
for (Iterator<User> iterator = users.iterator(); iterator.hasNext(); ) {
User user = iterator.next();
System.out.println(user);
}
}
}
三、Gson解析：
1.导包：google-gson.jar；
2.解析：
（1）序列化：
Gson gson = new Gson();
String json = gson.toJson(obj);
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
User user = new User();
user.setName("zs");
user.setAge(12);
Gson gson = new Gson();
String userStr = gson.toJson(user);
resp.getWriter().print(userStr);
}
}
（2）反序列化：
1）普通对象
Gson gson = new Gson();
Book book = gson.fromJson(json, Book.class);
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userStr = "{\"name\":\"zs\",\"age\":13}";
Gson gson = new Gson();
User user = gson.fromJson(userStr, User.class);
System.out.println(user);
}
}
2）Lsit，set集合
//将json转换成List
List list = gson.fromJson(json,new TypeToken<List>() {}.getType());
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String usersStr = "[{\"name\":\"zs\",\"age\":12},{\"name\":\"ls\",\"age\":16}]";
Gson gson = new Gson();
List list = gson.fromJson(usersStr, new TypeToken<List>() {}.getType());
for (Iterator iterator = list.iterator(); iterator.hasNext(); ) {
Object user = iterator.next();
System.out.println(user);
}
}
}
//将json转换成Set
Set set = gson.fromJson(json,new TypeToken<Set>() {}.getType());
@WebServlet("/jsonTest")
public class JsonTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String usersStr = "[{\"name\":\"zs\",\"age\":12},{\"name\":\"ls\",\"age\":16}]";
Gson gson = new Gson();
Set set =gson.fromJson(usersStr, new TypeToken<Set>() {}.getType());
for (Iterator iterator = set.iterator(); iterator.hasNext(); ) {
Object user = iterator.next();
System.out.println(user);
}
}
}
三、js序列化/反序列化：
1.序列化：JSON.stringify(obj[arr])；//把对象或数组转为String；
2.反序列化：JSON.parse(字符串); //把字符串转换为javascript对象；
//非标字符串：使用eval("("+字符串+")");
3.json字符串：
1）标准：var str = '{"sid":"001","sname":"张三","sage":17,"ssex":"男"}';
//JSON.parse(str)；
2）非标：var str = "{'sid':'001','sname':'张三','sage':17,'ssex':'男'}";
//eval("("+str+")")；
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