1.导入如下三个jar包
2.示例代码
@WebServlet("/demo") public class DemoServlet extends HttpServlet { @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("执行控制器"); String name = req.getParameter("name"); Users users = new Users(); users.setId(1); users.setPassword("123"); users.setUsername("张三"); Users users1 = new Users(); users1.setId(2); users1.setPassword("22"); users1.setUsername("李四"); List<Users> list = new ArrayList<Users>(); list.add(users1); list.add(users); //创建能够将Java对象转换为Json格式的工具对象 ObjectMapper mapper = new ObjectMapper(); //将Java的List对象转换为Json数组对象 String result1 = mapper.writeValueAsString(list); //将Java对象转化为Json格式 String result2 = mapper.writeValueAsString(users); //设置响应格式 resp.setContentType("application/json;charset=utf-8"); PrintWriter out = resp.getWriter(); //返回响应数据 out.println(result1); out.println(result2); out.flush(); out.close(); } }
