GSON转换日期数据为特定的JSON数据

　　通过JSON传递数据的时候经常需要传递日期，Java中可以通过GSON将日期转换为特定格式的JSON数据。

1.普通的GSON转换日期

    public void query(HttpServletRequest request, HttpServletResponse response, RegisterService service)
            throws Exception {
        Integer id = Integer.parseInt(request.getParameter("id"));
        Register register = service.getRegisterById(id);
        Gson gson = new Gson();
        String json = gson.toJson(register);
        System.out.println(json);
        response.getWriter().write(json);
    }

转换后的日期格式:

aaarticlea/png;base64,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" alt="" />

前台界面显示:

aaarticlea/png;base64,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" alt="" />

2.如果需要将日期格式转换为特定日期格式的数据:

    // 查询
    public void query(HttpServletRequest request, HttpServletResponse response, RegisterService service)
            throws Exception {
        Integer id = Integer.parseInt(request.getParameter("id"));
        Register register = service.getRegisterById(id);
        //转换日期格式，也可以new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
        Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create();
        String json = gson.toJson(register);
        System.out.println(json);
        response.getWriter().write(json);
    }

 转换后的日期JSON:

aaarticlea/png;base64,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" alt="" />

前台界面显示的日期格式:

aaarticlea/png;base64,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" alt="" />