本文共 2653 字，大约阅读时间需要 8 分钟。
文章来源：http://blog.csdn.net/encienqi/article/details/7840532
- public class User {
-
- private String username;
- private String password;
-
- public String getUsername() {
- return username;
- }
- public void setUsername(String username) {
- this.username = username;
- }
- public String getPassword() {
- return password;
- }
- public void setPassword(String password) {
- this.password = password;
- }
-
- }
普通JavaBean(以User为例)转成json格式 1.转成JSONArray类型 User user = new User(); user.setUsername("cxl"); user.setPassword("1234"); JSONArray json = JSONArray.fromObject(user); System.out.println(json);//[{"password":"1234","username":"cxl"}] response.getWriter().print(json.toString()); 在js文件取数据 $.getJSON("http://localhost:8080/jQueryDemo/servlet/UserServlet",null,function(data) { alert(data[0].username); alert(data[0].password); }); 2.转成JSONObject类型 JSONObject jsonObj = JSONObject.fromObject(user); System.out.println(jsonObj);//{"password":"1234","username":"cxl"} response.getWriter().print(jsonObj); 在js文件取数据 alert(data.username); alert(data.password); List转成json格式 List<User> users = new ArrayList<User>(); User user = new User(); user.setUsername("cxl"); user.setPassword("1234"); User u = new User(); u.setUsername("lhl"); u.setPassword("1234"); users.add(user); users.add(u); 1.转成JSONArray类型 JSONArray json = JSONArray.fromObject(users); System.out.println(json.toString()); //[{"password":"1234","username":"cxl"},{"password":"1234","username":"lhl"}] response.getWriter().print(json.toString()); js中取数据：alert(alert(data[0].username)); 2.转成JSONObject类型 不可直接使用JSONObject jsonObj = JSONObject.fromObject(users); 可通过下列方式 JSONObject jsonObj = new JSONObject(); jsonObj.put("users", users); jsonObj.put("u", u); System.out.println(jsonObj); {"users":[{"password":"1234","username":"cxl"},{"password":"1234","username":"lhl"}], "u":{"password":"1234","username":"lhl"}} response.getWriter().print(jsonObj); js中取数据：alert(data.users[0].username); alert(data.u[0].username); Map转成json格式 Map<String,Object> map = new HashMap<String,Object>(); map.put("users", users); map.put("u", u); 1.转成JSONArray类型 JSONArray json = JSONArray.fromObject(map); System.out.println(json.toString());// [{"users":[{"password":"1234","username":"cxl"},{"password":"1234","username":"lhl"}],"u":{"password":"1234","username":"lhl"}}] response.getWriter().print(json.toString); js中取数据：alert(data[0].users[0].username); 2.转成JSONObject类型 JSONObject json = JSONObject.fromObject(map); System.out.println(json);// {"user":[{"password":"1234","username":"cxl"},{"password":"1234","username":"lhl"}],"u":{"password":"1234","username":"lhl"}} response.getWriter().print(json); js中取数据：alert(data.user[0].username);